Attachment_1_-_APN-209_Final_Acceptance_Test_Procedure_REV_E_-_17R0017.pdf

ACCEPTANCE TEST PROCEDURE

FOR

RECEIVER – TRANSMITTER HEIGHT INDICATOR

RT-1115C/APN-209(V) ............................................................................ 5841-01-245-9090 RT-1115D/APN-209(V) ............................................................................ 5841-01-245-9091 RT-1411/APN-209(V) .............................................................................. 5841-01-140-1700 RT-1411A/APN-209(V) ........................................................................... 5841-01-245-9094

Revision E 21 July 2016

Prepared by: Production Engineering Directorate C3/Avionics Division Jesse Malecki and Corey Katsak

AN/APN-209 ATP REV. E

[1]

T A B L E O F C O N T E N T S

INTRODUCTION

Title Page Scope Purpose Description Applicable Documents Requirements Acceptance Sequence Acceptance Procedure Qualifications Test Equipment AN/APN-209 Test Station Description Visual and Mechanical Requirements Difference Between Models Performance Test Procedures Test Station Initialization

TESTS

Test Number Title Page

Preliminary Tests A .................................... Temperature Compensation Test B .................................... Installation Delay Test

Zero Range Tests 1 .................................... Power On Control and Short Term Drift Test 2 .................................... Self Test 3 .................................... Zero Range Transmitter Output and Blanking Pulse Test 4 .................................... Frequency Range and PRF Inhibit Test 5 .................................... Zero Feet Sensitivity and Acquisition Test 6 .................................... Altitude Memory Test 7 .................................... Search Rate Test 8 .................................... Electrical Tracking Rate and Data Log Test 9 .................................... Integral Lighting Test 10 .................................. Dim Control Test

Far Range Tests 11 .................................. Far Range Transmitter Output and Blanking Pulse Test 12 .................................. Far Range Sensitivity and Acquisition Test 13 .................................. Altitude Range and Accuracy Test 14 .................................. High and Low Altitude Alarm Trip Test 15 .................................. Unreliable Operation Test 16 .................................. Power Failure Test

Final Test

19 .................................. Final Adjustment

TABLES

Table Title Page 1 .................................... Performance Test Matrix 2 .................................... Test Equipment 3 .................................... Test Station Control/Monitor, Switch S1, and Signals RT Test Functions... 10 4 .................................... Altitude Range and Accuracy 5 .................................... HI Altitude Trip 6 .................................... LO Altitude Trip

FIGURES

Figure Title Page 1 .................................... Test Station Functional Block Diagram 2 .................................... Temperature Compensation Test Configuration 3 .................................... Temperature Test Profile 4 .................................... Acceptance Test Configuration

[3]

I N T ROD U C T IO N

S C O P E

This document describes a series of inspections and tests that will demonstrate compliance of a repaired RT-1115C/APN-209(V) or RT-1115D/APN-209(V) to the Performance Specification MIL-PRF- 49079B (CR) provided as Appendix A. The following test requirement drawings are for reference purposes.

Model Test Requirement Drawings RT-1115C/RT-1411/APN-209(V)..................................................... SM-A-967137 RT-1115D/RT-1411A/APN-209(V) .................................................. A3060587

P U R P O S E The herein described inspections and tests shall verify the performance specifications in the test paragraphs shown in Table 1: Performance Test Matrix.

Table 1: Performance Test Matrix Performance Specification Test

Temperature Compensation ................................................................................................. Preliminary Installation Delay .................................................................................................................. Preliminary Power On Control ................................................................................................................. Zero Range Short Term Drift .................................................................................................................... Zero Range Self-Test ................................................................................................................................ Zero Range 0-Feet Transmit Power .......................................................................................................... Zero Range 0-Feet Transmit Pulse Width ................................................................................................ Zero Range 0-Feet Blanking Pulse ............................................................................................................ Zero Range Transmit Frequency .............................................................................................................. Zero Range PRF-Inhibit ............................................................................................................................. Zero Range 0-Feet Sensitivity ................................................................................................................... Zero Range 0-Feet Acquisition ................................................................................................................. Zero Range Altitude Memory ................................................................................................................... Zero Range Search Rate ........................................................................................................................... Zero Range Electrical Tracking Rate ......................................................................................................... Zero Range Data Lag ................................................................................................................................ Zero Range Integral Lighting .................................................................................................................... Zero Range Dim Control ........................................................................................................................... Zero Range Far Range Transmit Power .................................................................................................... Far Range Far Range Blanking Pulse ...................................................................................................... Far Range Far Range Sensitivity ............................................................................................................. Far Range Far Range Acquisition ........................................................................................................... Far Range Altitude Range and Accuracy ................................................................................................ Far Range High and Low Altitude Trip ................................................................................................... Far Range Unreliable Operation ............................................................................................................ Far Range Power Failure ........................................................................................................................ Far Range Final Adjustment ................................................................................................................... Final

D E S C R I P T I O N The Height Indicator/Receiver/Transmitter (IRT) is a Radar Altimeter that transmits an RF Pulse

Signal, receives the reflected return echo, and derives the proper signals for altitude range of 0ft to at least 1500ft. In addition, the IRT displays analog altitude, digital altitude, and high and low altitude warnings. It provides these signals along with an auxiliary analog altitude signal, a digital altitude signal, a reliability signal and a self test confidence signal. Digital altitude is indicated on a four digit lighted readout. Above 200ft, the digital altitude is rounded to the nearest 10ft. Movable markers positioned against the same dial shall indicate the preselected height above or below which the high and low altitude warnings operate. Unreliable operation is indicated by an "off” flag coming into view and the digital readout blanked when:

• The signal strength to the IRT becomes inadequate to provide reliable altitude information, or

• The IRT is turned off, or

• Aircraft power to the system is lost, or

• Aircraft altitude is above the maximum track altitude. The maximum track altitude is between

1,500 and 2,000ft.

Unreliable indications shall remain in view at altitudes above 2,000ft.

A P P L I C A B L E D O C U M E N T S The following documents form a portion of this Acceptance Test Procedure to the extent noted herein. In the event of a conflict, MIL-PRF-49079B (CR) takes precedence.

Specifications Military MIL-A-49079B (CR) ............................................................. Electronic Altimeter Set AN/APN-209(V) MIL-I-49077A (AV) ................. Installation and Acceptance Test of AN/APN-209(V) in Army Aircraft

Drawings RT-1115D/APN-209(V) A3060585 ....................................... Receiver-Transmitter, Height Altimeter RT-1115D/APN-209(V) A3060586 ................................................................................ Schematic for RT-1115D/APN-209(V) A3060587 .................................................................. Test Requirements for RT-1115D/APN-209(V) A3060603 ......................................................................................... Receiver-Transmitter Assembly A3060605 .................................................... Test Requirements for Receiver-Transmitter Assembly A3060606 ............................................................................................................................ IF CCA A3 A3060607 ......................................................................................................... Schematic, IF CCA A3 A3060608 ........................................................................................... Test Requirements, IF CCA A3 A3060610 ...................................................................................... Power Supply Modulator CCA A1 A3060611 ................................................................................ Schematic, Power Supply Modulator A3060612 .................................................. Test Requirements, Power Supply Modulator IF CCA A3 A3060614 .................................................................................................................. Tracker CCA A5 A3060615 ................................................................................................ Schematic, Tracker CCA A5 A3060616 .................................................................................. Test Requirements, Tracker CCA A5 A3060633 ....................................................................................................... Indicator Subassembly A3060634 .......................................................................................... Schematic, Indicator Assembly

[5]

A3060635 ...................................................................... Test Requirements, Indicator Subassembly A3060636 ............................................................................................................ Indicator Assembly A3060643 ................................................................................................................... Case Assembly A3060644 ........................................................................................... Subassembly, Bezel Assembly A3060657 ......................................................................... Test Requirements, CCA Numeric Display A3060658 ....................................................................................... Schematic, CCA Numeric Display A3060659 ......................................................................................................... CCA Numeric Display A3060661 ....................................................................................................................... CCA, Analog A3060662 ...................................................................................................... Schematic, CCA Analog A3060663 ........................................................................................ Test Requirements, CCA Analog A3060743 ............................................................................... Power Supply Heat Sink Assembly A1 A3060745 .................................................................................................................... Digital CCA A6 A3060746 .................................................................................................. Schematic, Digital CCA A6 A3060747 .................................................................................... Test Requirements, Digital CCA A6

Drawings RT-1115C/APN-209(V) SM-B-967135 ................................................................................... Receiver-Transmitter Assembly SM-A-967137 .................................................. Test Requirements, Receiver-Transmitter Assembly SM-B-967142 .......................................................................................... Range Computer Assembly SM-E-967143 ........................................................................ Schematic, Range Computer Assembly SM-A-967144 ........................................................... Test Requirement, Range Computer Assembly SM-B-967152 .................................................................................................. Transmitter Assembly SM-E-967153 ................................................................................ Schematic, Transmitter Assembly SM-E-967154 .................................................................. Test Requirements, Transmitter Assembly SM-B-967160 ....................................................................................................... Receiver Assembly SM-E-967161 ..................................................................................... Schematic, Receiver Assembly SM-A-967162 .......................................................................Test Requirements, Receiver Assembly SM-B-967168 ............................................................................................... Power Supply Assembly SM-E-967169 ............................................................................. Schematic, Power Supply Assembly SM-A-967170 .............................................................. Test Requirements, Power Supply Assembly SM-C-967292...... Receiver-Transmitter, Height Altimeter 1115C/APN-209(V),Schematic,Test Req.

R E Q U I R E M E N T S This section provides the inspection, test equipment, and test method requirements for the acceptance of the unit.

A C C E P T A N C E S E Q U E N C E Individual inspections, adjustments, and tests shall be made in the sequence shown within the section Performance Test Procedures.

A C C E P T A N C E P R O C E D U R E Q U A L I F I C A T I O N S Test Accuracy

The pass/fail criterion for each of the steps of this test procedure is provided as part of the procedure. This criterion shall take into account the measurement accuracy of the test equipment involved.

Correction of Test Procedure

The test technician is permitted to make red-line corrections to the test procedure under the following conditions:

1. Corrections or technical or typographical errors.

2. Equipment Change

a. The test technician is permitted to substitute equivalent test equipment for the required tests.

3. Test Sequence

a. Individual measurement can be made in any sequence at the discretion of the test technician.

4. Procedure in Case of Failure

a. In the event of failure, the test shall be stopped. The cause of failure shall be determined and corrected, if possible.

The test technician and/or QC representative shall make a determination if previous data was affected.

The testing shall be resumed and tested again where data might have been affected.

T E S T E Q U I P M E N T The equipment listed in Table 2: Test Equipment shall be used to perform the acceptance test.

Equivalent substitute items may be used at the discretion of the test technician.

Table 2: Test Equipment Nomenclature Model Manufacturer Quantity Altimeter Test Station ........................ AN/APN-209(V) .................. TYAD

NOTE

The Altimeter Test Station contains the following:

Digital Multi-meter ............................ 34401A ............................... Fluke Oscilloscope ....................................... TD5303B ............................ Tektronics Peak Power Analyzer.......................... 4500B ................................. Boonton Control/Monitor Panel ....................... N/A ..................................... TYAD Time Synthesizer ................................ 33250A ............................... Agilent RF Control Panel ................................. N/A ..................................... TYAD Signal Generator ................................ 83731B ............................... Agilent

The following additional equipment is required:

Spectrum Analyzer ............................. E4407B ............................... Agilent Delay Line RF ...................................... 100 Ft ................................. TYAD

[7]

Attenuators ........................................ N/A ..................................... N/A ................................ AS REQUIRED Environmental Chamber .................... T10C ................................... Tenney Balanced/Unbalanced Cables ............ W5...................................... TYAD

A N / A P N - 2 0 9 T E S T S T A T I O N D E S C R I P T I O N The test station functional block diagram is shown in Figure 1.

The test station includes all the test equipment necessary to perform Specification Tests of the unit. The digital multi-meter allows for monitoring of DC voltages and currents. The oscilloscope allows for monitoring of analog and digital signals. The peak power analyzer allows for monitoring of transmit peak power and pulse widths.

The control/monitor panel allows for selection of all voltages and signals to be monitored. It also contains a forced track circuit and a discrete T-O and T-X Test Simulator.

The Time Synthesizer provides a delayed pulse modulation to the signal generator for development of the simulated RF delayed receive pulse. The RF Control Panel provides attenuator control and selection of either ZERO Range or FAR Range RF-Receive signals. It also allows for monitoring of the transmit signals by the peak power analyzer and spectrum analyzer.

[9]

V I S U A L A N D M E C H A N I C A L R E Q U I R E M E N T S Workmanship

The unit shall be repaired and/or retrofitted in accordance with the applicable drawings listed in the Applicable Documents section of this document.

Marking

The unit shall be inspected for markings, nameplate in accordance with the applicable drawings listed in the Applicable Documents section of this document.

Protective Finish

The unit hardware shall be finished in a dull neutral, non-glossy black color consistent with the applicable drawings listed in the Applicable Documents section of this document.

ALL DAMAGED PROTECTIVE FINISHES SHALL BE REPAIRED TO THE EXTENT NECESSARY TO PROVIDE ADEQUATE PROTECTION DURING USAGE. ALL DAMAGED, ILLEGIBLE OR PEELING, MARKINGS, DECALS, ETC., SHALL BE REPLACED.

D I F F E R E N C E B E T W E E N M O D E L S The Height Altimeters RT-1115C and RT-1115D each have a unique design referenced to their applicable drawing packages. Noted in the technical data packages are alignment/adjustment (calibration) procedures that the Unit Under Test (UUT) shall be reworked to. These technical data packages and the following performance differences are provided as a reference. For the purpose of the herein described performance tests, these differences shall make up a portion of the Test Requirements.

Transmitter Output Characteristic Specification RT-1115C/B/RT-1411 RT-1115D/ RT-1411A

Peak Power (MAX) @ ZERO feet

27dBm (MAX) (25 dBm NOMINAL)

24 ± 2 dBm

(ADJUSTED)

25 ± 2 dBm

(ADJUSTED)

Peak Power (MAX) @ 1000 feet

38.5 dBm (MAX) 31 dBm (NOMINAL) 34 dBm (MIN) 34 dBm (MIN)

Pulse Width @ ZERO feet

< 200 nsec (25 nsec NOMINAL)

75 ± 15 nsec

(ADJUSTED)

75 ± 10 nsec

(ADJUSTED)

Pulse Width @ 1000 feet

< 200 nsec (90 nsec NOMINAL) 75 ± 15 nsec 75 ± 10 nsec

DC Normal Operations Characteristics

Characteristic Specification RT-1115C/B/RT-1411 RT-1115D/ RT-1411A Power 27.5 @ .8A MAX 27.5 @ 1A MAX 27.5 @ .8A MAX

Blanking Pulse

Characteristic Specification RT-1115C/B/RT-1411 RT-1115D/ RT-1411A Pulse Width .9 ± .3 µsec 2.6 ± .3 µsec .9 ± .3 µsec

Rise Time .5 µsec MAX 1 µsec MAX .5 µsec MAX Lead Time to Transmit

Pulse .3 ± .1 nsec 2 ± .2 µsec .3 ± .1 µsec

P E R F O R M A N C E T E S T P R O C E D U R E S This section provides the Acceptance Test Procedures that shall demonstrate compliance to the specification requirements in MIL-PRF-49079B (CR), and listed within the Purpose section of this document. The tests shall be performed within the TYAD Facility at local ambient conditions unless otherwise stated. The tests have been grouped where the Design Requirement Specifications shall be demonstrated in either of the following:

Preliminary Tests Zero Range Test Far Range Test Final Test

Test Procedure Format

Each test procedure shall have the Design Requirement Specification paragraph listed and referenced, a Test Requirement paragraph indicating the method of the tests, and a detailed test procedure.

NO RSS ERROR ANALYSIS IS APPLIED TO PERFORMANCE SPECIFICATION REQUIREMENTS IN THIS

PROCEDURE.

IRT Test Monitor Table 3 provides the IRT input/output test conditions that the test station will monitor during

Final Performance Tests.

Table 3: Test Station Control/Monitor, Switch S1 and Signals RT Test Functions Position Function Description

J1-1 LO Warning

OUTPUT from IRT:

0 to 1.2V DC (LOW) when LO

Warning Indicator is ON.

+28V DC (HIGH) (Open Collector) when LO Warning

Indicator is OFF.

J1-2 HI Warning

OUTPUT from IRT:

0 to 1.2V DC (LOW) when HI

Warning Indicator is ON.

+28V DC (HIGH) (Open Collector) when HI Warning

Indicator is OFF.

J1-6 Blanking Pulse

OUTPUT from IRT:

The pulse is for external use to indicate the IRT is transmitting an RF pulse.

The pulse will be used by the test station to develop a delayed RF receive pulse.

J1-7 Dim Control INPUT from Test Station:

[11]

0 to 28V DC to IRT Digital and Alarm Indicator circuits.

J1-8 Simulated T-O Signal

OUTPUT from Test Station Simulator:

A test only signal which is used to simulate altitude.

Starts the IRT timing. Use in conjunction with the Simulated T-X Pulse at J1-11.

J1-9 +28V DC Power IN

INPUT from Test Station:

Power ON Control will be provided by the IRT or Remote Indicator (RI) when LO Set Bug is turned CLOCKWISE.

Will provide +28V DC to RT J2-5

J1-10 +5V DC/AC Power IN INPUT from Test Station:

5V DC to Integral Lighting Lamps of IRT (Indicator)

J1-11 Simulated T-X Signal

OUTPUT from Test Station Simulator:

A test only signal which is used to simulate which is used to simulate altitude.

Fires the IRT Transmitter with the Simulated T-O Pulse at J1-5.

J2-2 Remote Analog Altitude Voltage

(REM ANAL ALT)

OUTPUT from IRT:

The voltage shall be 0 to -10.5V

DC, representing 0 to 1500ft (-7mV per foot) during TRACK operation.

The voltage shall be -13 ± 2V DC during NO-TRACK or

UNRELIABLE operation.

The output will go to J2-5 on RI.

J2-2 Remote Analog Altitude (REM

ANAL ALT)

Same as S1 J1-2:

To be used with oscilloscope when performing Tracking Rate and Data Lag Tests.

J2-3

Auxiliary Analog Altitude Voltage (AUX ANAL ALT)

OUTPUT from IRT:

The voltage shall be proportional to J2-2, 10 to -

10.5V DC representing -1500ft (- 7mV per foot) during TRACK

The voltage shall be .75 ±.5V DC during NO TRACK or

UNRELIABLE operation.

The output will go to J2-21 of RI.

J2-4 Digital Enable Pulse

OUTPUT from IRT:

The Enable Pulse is a differential output provided during the time the Digital Altitude Pulses are being transmitted J2-12 to the

RI J2-3 and J2-4.

J2-5 POWER ON Control

INPUT from RI:

+25V DC is applied when LOW set knob on RI is rotated to

LOW.

Warning Index at or above ZERO feet.

The IRT is turned ON when +27.5V DC is applied to J1-9 and the power on control J2-5 is at

+25 ±5V DC.

J2-5 Push-to-Test (PTT)

INPUT from Test Station:

A LOW or GROUND applied to

IRT for more than 500 ±50msec shall cause the IRT to be placed in SELF TEST MODE.

The IRT shall provide -7 ±.7V DC (Analog Alt; representing

1000 ±100ft.) to RI.

The IRT shall provide a DIGITAL OUTPUT of 1000 ±100ft to RI.

The SELF TEST CONFIDENCE voltage at J2-13 shall be +4.5

±1V DC.

J2-6 Reliability Signal

OUTPUT from IRT:

Indicates validity of data. The voltage shall be 4.5 ±1V DC during TRACK or RELIABLE

[13]

The voltage shall be .5 ±.5V DC during SEARCH or UNRELIABLE

This output shall go to J2-10 of

RI.

J2-12 Digital Altitude Pulse

OUTPUT from IRT:

The Digital Altitude Pulse is a differential output.

The signal is a series of pulses with each pulse equal to 1ft of altitude.

Provided to the RI J2-16 and J2- 17 for the Digital Indicator reading.

J2-13 Self Test Confidence

OUTPUT from IRT:

The self test confidence signal shall be +4.5 ±1V DC when the PTT J2-5 is a low or ground and the REM ANAL ALT and AUX ANAL ALT voltages are -7 ±.7V

DC.

If the PTT is not low or ground or if either analog signal is not -

7 ±.7V DC, the self test confidence signal shall go to J2-

15 of RI.

T E S T S T A T I O N I N I T I A L I Z A T I O N The following procedure provides the initial test equipment settings of the AN/APN-209 Test

Station.

NOTE

Use RT-1115C settings for RT-1411 Use RT-1115D settings for RT-1411A

CONTROL MONITOR PANEL

Label Control Indication Track Rate ............................................................ Power ......................................... OFF 28/5 Current Monitors ......................................... Switch ........................................ OFF 28 VDC .................................................................. Power Switch ............................. OFF 5 VDC .................................................................... Power Switch ............................. OFF Monitor IRT/RT .................................................... S1 Knob ...................................... J1-9 (28V DC PWR) PRF INHIBIT .......................................................... Switch ........................................ OFF PTT (Push-to-Test) ................................................ Switch ........................................ OFF Main Power .......................................................... AC Power Switch ........................ ON

THIS WILL APPLY AC POWER TO ALL RACK TEST EQUIPMENT.

RF SIGNAL GENERATOR

Power ................................................................... Switch ........................................ ON Frequency ............................................................ Select ......................................... 4.3 GHz Output Level ......................................................... Select ......................................... 0 dBm EXT Pulse .............................................................. Modulation ................................ ON

OSCILLOSCOPE

Power ................................................................... Switch ........................................ ON

DIGITAL MULTI-METER

Power ................................................................... Switch ........................................ ON

PEAK POWER ANALYZER

Menu Control Setting Trigger .................................................................. Trig'd Edge Source Level ........................................... 3V Rising Edge Hold Off ...................................... 40.00 nsec

[15]

Display .................................................................. Avg.

# of Avg Power Display ............................ log # of screens Type Screen ............................... Frame Connect Dots ............................. On

Chan/Vert. ............................................................ Channel ...................................... On Scale ........................................... 5 dB/div Ref. Level .................................... 40 dBm Bandwidth .................................. Auto External Loss .............................. 21.0 dB* Channel 2 ................................... On Scale ........................................... 500 mV/div Offset ......................................... 5V DC Channel 3 ................................... Off Channel 4 ................................... Off

*Programmed loss of J4 Transmit Output to Peak Power Analyzer

Time Base .................................................................................................... RT-1115C: 500 nsec RT-1115D: 200 nsec

Markers ................................................................ Amp 1 Markers .......................... On Marker 2 .................................... 2V Marker 1 .................................... 1 dBm Time Markers ............................. On Start Marker. .............................. N/A Stop Marker. .............................. N/A

TIME SYNTHESIZER

Pulse Width .......................................................... (NOTE 1) ..................................... RT-1115C: 100 nsec RT-1115D: 50 nsec Delay .................................................................... (NOTE 1) ..................................... RT-1115C: 1.850 µsec RT-1115D: 150 nsec Input Level ............................................................ Polarity ....................................... + Fully CW Output Level ......................................................... Norm .......................................... + Fully CW Trigger Mode ........................................................ Ext .............................................. Fully CW

RF CONTROL PANEL

Zero/Far Range .................................................... Switch ........................................ Zero Far Range Loop..................................................... ATTN Knob (NOTE 2) .................. 10 dBm (Knob setting) Zero Range Loop .................................................. ATTN Knob (NOTE 2) .................. 0 dB(Knob setting)

NOTE 1

The time synthesizer will be local programmed. Enter Pulse Width and Delay and press UPDATE.

NOTE 2

The RF Control Panel contains a delay line (30 ft) and attenuators in the ZERO RANGE LOOP.

With both attenuators set for 0 dB, the TOTAL ZERO LOOP attenuation is 50 dB from J4 TRANSMIT to J3 RECEIVE of the UUT. Throughout this procedure when LOOP ATTN is referenced, set the attenuators to the required value of +50 to establish LOOP attenuations.

The RF Control Panel also contains two attenuators in the FAR RANGE. When the attenuators and signal generators are both set for 0 dB, the established RECEIVE INPUT to J3 of the UUT is -20 dBm.

Throughout this procedure when FAR RANGE ATTN Value is referenced, set the attenuators to required value +20dBm to establish the required RECEIVE INPUT.

[17]

P R E L I M I N A R Y T E S T s

A. Temperature Compensation Test/Environmental Stress This test may be performed in process and does not require inspection

THE UUT IS PLACED UNDER THE TEMPERATURE EXTREMES FOR THE TIME REQUIRED TO VERIFY THAT

IT MAINTAINS ITS ALTITUDE ACCURACY THROUGH:

HOT: ±0.028 VDC (±4 FT) AND COLD: ±0.049V DC (±7 FT).

Test Requirement

The IRT shall be placed into an environmental chamber. Power shall be applied with a ZERO Foot Delay and 50 ±2 dB attenuation between the TRANSMIT and RECEIVE connectors. The chamber shall be cycled to the profile in Test Procedure and verification shall be made to the test requirements.

Record test results on a test data sheet.

1. Connect the equipment as shown in Figure 2.

2. Set DC Power Supply for +27.5V DC.

3. On Control Fixture, set +28V DC to ON.

4. On RI, set power control (LO Set) clockwise and verify IRT turns on.

5. On Digital Volt Meter 1 (DVM 1) (REM ANALOG), monitor the DC voltage and adjust ANALOG ADJUST on RT so that REM ANALOG ALT voltage is 0.070 ±.010V DC.

6. Monitor RI and adjust DIGITAL ADJUST on IRT so that RI DIGITAL READOUT IS 10ft (10 pulses).

7. For 10 minutes, allow IRT to stabilize at ambient temperature 25° C.

a. If required, adjust RT ANALOG and DIGITAL ADJUST to values in Step 5 and 6 above.

8.

Initiate the Temperature Chamber Test Profile as shown in Figure 3.

9. Lower the temperature to -40° C.

a. After 40 minutes minimum, verify the following (UNCOMPENSATED MAXIMUM) ANALOG and DIGITAL output:

ANALOG DIGITAL

-40° C ....................................................... ± 0.049V DC ............................... ± 7ft

10. Raise the temperature to +55° C.

a. After 40 minutes minimum, verify the following (UNCOMPENSATED MAXIMUM)

ANALOG and DIGITAL output:

ANALOG DIGITAL

+55° C ...................................................... ± 0.028V DC ............................... ± 4ft

[19]

Installation Delay Test

Verification shall be made that ANALOG and DIGITAL readout can be adjusted to at least 70ft below the indication. The ANP-209 test station includes a 100ft delay line built in. The UUT will be connected to the test station and it will be verified that the digital and analog indicators can be zeroed.

Record test results on a test data sheet.

RF Control Panel Indication Range Select Switch .................. ZERO Zero Range ATTN Knob ............. -50 dBm LOOP (Knob setting 0)

1. On Control Fixture, set 28 VDC to ON.

2. Adjust ANALOG and DIGITAL ADJUST on IRT and verify that the ANALOG voltage and DIGITAL READOUT can be zeroed.

3. Set range select to Far Range and far range ATTN to 30dB (knob setting of 10)

4. If not already set, adjust Delay Synthesizer for:

Pulse Width ............................... RT-1115C/1411: 100 nsec RT-1115D/1411A: 50 nsec

5. Set Delay Synthesizer to zero the UUT.

6. Verify that the indicator can be adjusted to 70ft above zero using the ANALOG and DIGITAL

ADJUST.

7. Set range select back to Zero range.

8. Return Digital and Analog readouts back to zero using the ANALOG and DIGITAL ADJUST.

Z E R O R A N G E T E S T S

1. Power On Control and Short Term Drift Tests

The IRT shall be energized at ZERO RANGE with a total loop attenuation of 50 ±2 dB by turning the power on control (LO Set) clockwise. Verification shall be made that the input current does not exceed 0.8 amperes (SEE DIFFERENCE BETWEEN MODELS, PAGE 9) for search, track and self-test modes.

AFTER 2 MINUTE WARM-UP, THE SHORT TERM DRIFT SHALL BE VERIFIED THAT IN 15 MINUTES THE

REM ANALOG OUTPUT DOES NOT EXCEED ±2FT.

1. Connect the RT to the Test Station as shown in Figure 4 below.

2. Configure the Test Station as follows:

[21]

RF CONTROL PANEL

Control Indication Range Select SW ........................ Zero ZERO Range ATTN Knob ............ 90 dB LOOP (knob setting of 40)

CONTROL/MONITOR PANEL

Control Indication RI HI Set ..................................... 200ft S1 Switch .................................... PWR ON CTRL J2-5 RI LO Set ..................................... Fully CCW (Counter-Clockwise)

3. On Control/Monitor Panel, set the following controls:

a. Connect a DC ammeter to the 28V Current Monitor test jacks and set multi-meter to read current.

Caution:

Do not set the Digital multi-meter to read current before connecting it to the current monitor jack.

b. Set Control Panel 28V DC Switch to ON (if not already on).

c. Set 28V DC current monitor switch to ON.

4. On IRT set LO POINTER to 100ft to turn IRT power ON.

a. Verify the following:

Indications RT-1115C/1411 RT-1115D/1411A RT Input Current ..................................... 1.1 Amperes MAX ................................... 0.8 Amperes MAX RI OFF Flag .............................................. In view RI HI Lamp .............................................. OFF RI LO Lamp ............................................. OFF RI HI DIGITAL READOUT ......................... Blank RI HI DIAL POINTER................................. Past 1500ft behind mask

5. On IRT, set LO POINTER to full counter-clockwise to turn IRT OFF.

6. Set 28V DC current monitor switch to OFF.

7. Disconnect multi-meter probes from the current monitor jacks and set multi-meter to read voltage. Connect to the S1 monitor jacks

8. On RF Control Panel, set ZERO RANGE ATTN to provide 50 dB loop attenuation.

9. Turn on IRT and monitor the following and adjust the IRT to provide the following indications:

Indicator Requirement OFF FLAG .............................................................. Not in View LO Lamp ............................................................... ON Dial Pointer Requirement Analog .................................................................. Back light Illuminated and at 0 ±3ft Digital Readout .................................................... Illuminated at 0 ±3ft

10. Monitor the DC Voltage (REM ANAL J2-2) for 15 minutes.

a. Verify the short term drift does not exceed 2ft.

2. Self Test

1. Maintain the test configuration shown in Figure 4.

2. Set IRT HI Bug to 1500ft.

3. Set the ZERO LOOP attenuation to 50 dB.

4. On Test Station set PTT switch to ON.

Indicator Requirement Dial Pointer ................................ 1000 ± 100ft Digital Readout .......................... 1000 ± 100ft HI Lamp ...................................... OFF LO Lamp ..................................... OFF

IRT Indication Requirement

AUX ANAL ALT J2-2 .................... -7.00 ±.7V DC

REM ANAL ALT J2-3 ................... -7.00 ±.7V DC

Self Test Conf. J2-13 .................. 4.75 ±0.75V DC

5. On Test Station, set PTT Switch to OFF.

a. Verify the ANALOG and DIGITAL returns to Zero Feet.

6. Verify that the Push to test button on the IRT functions properly. (Same results as step 4)

3. Zero Range Transmitter Output and Blanking Pulse Test

The ZERO RANGE Transmit Peak Power and Pulse Width/Blanking Pulse Level and Pulse Width shall be measured using the Peak Power Analyzer.

RF Control Panel Indication

[23]

Range Select Switch .................. Zero ZERO Range ATTN Knob ............ 50 dB Loop

3. On the Peak Power Analyzer, use the TIME BASE/TRIGGER DELAY Control to CENTER the transmit pulse on the screen.

a. Expand the TIME BASE to 100ns.

b. Be sure that the transmit pulse is between time markers 1 and 2.

4. On the Peak Power Analyzer, use the AMPL MKR 1 (dBm) and set the MKR line on the PEAK of the transmit pulse.

a. From screen, verify the following for a RT-1115D/1411A:

Maximum Peak Power: ............. 27 dBm Nominal Peak Power: ................ 25 dBm Minimum Peak Power: .............. 21 dBm *For an RT-1115C/1411 model, adjust the ZERO RANGE ATTN to obtain these values.

SEE DIFFERENCE BETWEEN MODELS, PAGE 8.

5. On the Peak Power Analyzer, use the AMPL MKR 1 (dBm) and set the MKR line -3 dB from the peak of the transmit pulse.

6. Use the START/STOP MKRS to place the time MKRS on the 3 dB points.

7. From the screen, verify the DELTA time (Δt) coincides with the following:

DESIGN REQUIREMENT: < 100 nsec (25 nsec Nominal).

THE PULSE WIDTH VALUE SHALL BE BETWEEN 20 AND 40 NSEC.

SEE DIFFERENCE BETWEEN MODELS, PAGE 8.

8. On the Peak Power Analyzer, use the TIME BASE/DELAY Control to center the blanking pulse on the screen.

9. Use the AMP MKR 2 (volts) and set the MKR line on the PEAK of the pulse.

a. From screen, verify the following for the appropriate model:

Blanking Pulse Level .................. 6.0 ±0.75V Baseline ..................................... 0.0 ±0.5V

10. Use the START/STOP MKRS to place the time MKRS on the 50% points of the Blanking Pulse.

11. From screen, verify the DELTA time (Δt) complies with the following:

RT-1115C/1411 RT-1115D/1411A

2.6 ±0.3 μsec 0.9 ±0.3 µsec

12. Use the TIME BASE/DELAY Control on analyzer to place both the Transmit Peak Power and the Blanking Pulse on the screen.

13. Use the START MKR to place MKR on the RISE of the BLANKING PULSE.

14. Use the STOP MKR to place MKR on the RISE of the TRANSMIT PULSE.

15. From the screen, verify the DELTA time (Δt) complies with the following:

2.0 ±0.2 µsec 0.3 ±0.1 µsec

4. Frequency Range and PRF Inhibit Test

The IRT Transmit Frequency shall be measured at 4300 ±100 MHz using the Peak Search

Function of the Spectrum Analyzer. A TTL Low (GND) applied from the Test Station shall inhibit the IRT Transmitter. Verification shall be made using the Peak Search Function of the Spectrum Analyzer.

a. If not already completed, connect the Spectrum Analyzer to the Spectrum Analyzer Connector on the Test Station’s RF Control Panel.

2. Configure the Spectrum Analyzer as follows:

CENTER FREQ ............................. 4.3 GHz RESOLUTION BANDWIDTH ........ 300 kHz VIDEO BANDWIDTH .................. 300 kHz SPAN ......................................... 1 GHz* REF LEVEL .................................. -10 dBm* SWEEP ....................................... 50 msec ATTN .......................................... 5 dB*

* THESE SETTINGS ARE FLEXIBLE

3. Configure the Test Station as follows:

ZERO Range ATTN Knob ............ 50 dBm LOOP

4. On Spectrum Analyzer press PEAK SEARCH.

a. From Spectrum Analyzer screen, verify the following:

DESIGN REQUIREMENT: 4.3 GHz ±100MHz

5. Monitor the Spectrum Analyzer.

a. On Control Monitor Panel set the PRF INHIBIT switch to ON.

[25]

b. There will be a small delay.

i. Verify there is no RF Transmission.

6. On Control Monitor Panel, set the PRF INHIBIT switch to OFF.

5. Zero Feet Sensitivity and Acquisition Test

The sensitivity shall be checked at ZERO RANGE with an initial setting of 50 ± 2 dB loop attenuation. Attenuation shall be increased until IRT breaks track. Acquisition shall be verified by decreasing attenuation until RT reacquires the return signal.

Range Select Switch .................. Zero ZERO Range ATTN Knob ............ 50 dB LOOP

Control Monitor Panel Indication Reliability Signal S1 J2-6 ............ 4.5 ± 1V DC

3. Verify the IRT indicates 0 ft as shown on Indicator.

4. On RF Control Panel, slowly increase the ZERO RANGE attenuation until just when the IRT switches to a NO-TRACK condition.

a. Verify the following:

Attenuation Requirement ZERO Range ATTN Knob ............ 78 ± 5 dB

IRT Indication at S1 Requirement

REM ANAL ALT J2-2 ................... -13.0 ±2V DC

AUX ANAL ALT J2-3 .................... 0.6 ±0.3V DC

REL SIG J2-6 ................................ 0.0 ±0.6V DC

SELF TEST CONF J2-13 ................ 0.0 ±0.6V DC

5. On RF Control Panel, slowly decrease the ZERO RANGE attenuation until the IRT just switches to a TRACK Condition.

a. Verify the following:

Attenuation TRACK Requirement ZERO Range ATTN Knob ............ No more than 5 dB less than the value obtained for the

TRACK condition.

6. Altitude Memory Test

The IRT shall be energized in ZERO RANGE with a loop attenuation of 50 ± 2 dB. The time internal shall be recorded when the PRF Inhibit is initiated on the Test Station, to the drop-out of the Reliability Signal at J2-6. The memory time should be ±0.5 seconds.

Range Select Switch .................. ZERO ZERO Range ATTN Knob ............ 50 dB LOOP

3. Configure the oscilloscope as follows:

CH 1 ............................................ 5V/div CH 1 ............................................ 400msec/div Coupling ..................................... DC Trigger Mode ............................. Auto

4. On Control Monitor Panel, set S1 knob to J2-6.

a. Verify the REL SIG is 4.5 ± 1V DC.

5. On Control Monitor Panel, switch PRF INHIBIT to ON.

6. While monitoring the oscilloscope, quickly toggle the PRF INHIBIT switch OFF and then ON

a. A pulse will be seen on the oscilloscope.

7. On the oscilloscope, press RUN/STOP to capture the pulse on the screen.

8. Using the oscilloscope markers, verify that the signal is low for 1.8 ± 0.5 seconds before rising again, back to 0.5 ± 0.5V.

9. Before continuing,

a. Resume the sweep on the oscilloscope by pressing RUN/STOP.

b. On Control Monitor Panel, set the PRF INHIBIT switch of OFF.

[27]

7. Search Rate Test

The IRT shall be energized in a forced search condition by Increasing loop attenuation such that the RT break track. Two distinct pulse widths and levels will be observed at a rate of 4 ± 0.5 times per second and are measured on the Spectrum Analyzer.

ZERO Range ATTN Knob ............ 50 dB LOOP

3. If not already completed, connect the Spectrum Analyzer to the RF Control Panel Spectrum Analyzer connector.

4. Configure the Spectrum Analyzer as follows:

FREQ ........................................... 4.3 GHz REF LEVEL ................................... 0 dBm ATTN .......................................... 10 dB RESOLUTION BANDWIDTH ........ 100 kHz VIDEO BANDWIDTH .................. 30 kHz SPAN .......................................... 1 MHz SWEEP ........................................ 1.0 sec

MANUAL/SINGLE

5. Monitor the Spectrum Analyzer.

a. Shown shall be the ZERO Feet Power and Pulse Width Spectrum Level.

6. On RF Control Panel, set the ZERO Range ATTN to MAXIMUM attenuation.

7. Monitor the Spectrum Analyzer.

a. Shown shall be two (2) levels, (1) High and (1) Low.

i. Verify a rate of change of 4 ±.5 times per second.

* RT-1115D/1411A will have 2 levels RT-1115C/1411 will have a high and low with minor stepping

8. On RF Control Panel, set the ZERO Range ATTNs to 50 dB loop.

8. Electrical Tracking Rate and Data Lag Test

The Test Station shall provide Simulated T-ZERO and T-X pulses to the IRT at a rate of change of

1000 ft/sec. The REM ANALOG output voltage shall be monitored on the oscilloscope along with the Rate of Change Signal. Verification shall be made that the RT follows the change in altitude/height above ground level at a rate of at least 1000 ft/sec and the electrical analog data from the IRT does not lag any simulated altitude by more than 0.2 seconds.

Range Select Switch .................. Zero ZERO Range ATTN Knob ............ 50 dB LOOP

PRF Inhibit Switch...................... ON

3. Verify the unit is not tracking.

4. If not already completed, connect an RF cable from J2-2 of Control Monitor Panel to Channel 1 of the oscilloscope.

5. On Control Monitor Panel, configure the TRACK RATE simulator as follows:

Signal.......................................... RAMP Range Power ......................................... ON

6. Monitor the Indicator and the Test Station RI.

a. On TRACK RATE simulator, adjust the 1000ft RANGE OFFSET for a sweep of 500 to

1500ft (Nominal) on the INDICATOR.

7. Configure the oscilloscope as follows:

VERT MODE .............................. CH 1

CH 1 VOLTS/DIV ......................... 2.0

COUPLING .................................. DC

INVERT ....................................... OFF

TRIG MODE ............................... ROLL

TRIG SOURCE ............................ CH 1

TRIG SLOPE ............................... Positive

8. Observe waveform on oscilloscope.

a. Adjust the CH 1 position control to bring waveform to vertical center of screen.

[29]

9. On oscilloscope, press RUN/STOP to stop the sweep of the oscilloscope.

a. Adjust the position of the waveform to bring the peak to the center of the display.

10. Set TRACK RATE Simulator Power switch to OFF.

11. On oscilloscope, select the CURSOR FUNCTION,

a. Select Vertical Markers.

b. Adjust the time cursors to place them on the ramp of the signal and at 1 second apart.

c. Measure the difference of the two voltages.

12. Verify the RATE OF CHANGE (SLOPE) is at least 7 volts per second or a difference of 7V between cursors.

a. Verify that the waveform is not distorted.

7mV/ft;

1000ft = 7V = 1sec

13. If not already completed, connect an RF Cable from TRACK RATE simulator Modulating Signal Connector to CH 2 of the oscilloscope.

14. Set oscilloscope as follows:

a. Your settings should reflect the following for CH 2:

VERT MODE ............................... CH 2

CH 2 VOLTS/DIV ......................... 1.0

COUPLING .................................. DC

INVERT ...................................... ON

15. On oscilloscope, press RUN/STOP to resume the sweep of the oscilloscope.

16. Observe the two waveforms on the oscilloscope.

a. Adjust CH 2 position and volts/div to center waveform on screen and equal amplitude with CH 1 waveform.

17. On oscilloscope, press RUN/STOP to freeze the sweep of the oscilloscope.

18. Set TRACK RATE SIMULATOR power to OFF.

19. On the oscilloscope, expand the Time Base to 200 msec.

20. Using the Vertical Markers/Time Markers, compare the DATA LAG of REM ANAL ALT to the simulated range signal at the center Peaks of the waveforms.

LAG TIME ................................... Less than 0.2 seconds (< 200ms)

21. Set TRACK RATE simulator as follows:

SIGNAL ....................................... RAMP

RANGE

POWER ....................................... ON

22. On TRACK RATE simulator, adjust the 1500ft RANGE OFFSET for a sweep of 0 to 1500ft (Nominal) as shown on the INDICATOR and the Test Station RI.

23. On oscilloscope, press RUN/STOP to resume the sweep of the oscilloscope.

24. Monitor the oscilloscope and the IRT INDICATOR.

a. Verify the waveform exhibits a smooth slope.

b. Verify the ANALOG POINTER movement is smooth.

IF THERE IS ANY STICKING OF POINTER AND THE OSCILLOSCOPE DOESN’T SHOW ANY COINCIDING

WAVEFORM DISTORTIONS, THE INDICATOR WILL REQUIRE A POINTER SMOOTHNESS ALIGNMENT.

CAUTION

TRACK RATE SIMULATOR MUST BE TURNED OFF BEFORE TURNING OFF PRF INHIBIT CONTROL.

25. Set TRACK RATE SIMULATOR power switch to OFF.

26. Set PRF INHIBIT switch to OFF.

9. Integral Lighting Test

Skip this step for RT-1411 and 1411A

The test station shall apply 5V DC to the Integral Lighting function of the IRT. Current measurement and visual indication of the four lighting lamps shall verify compliance.

2. Configure…