PD_Rev3_12S-309-DC_counter.docx

12S-309A-DC

20 March 2012 Rev 3

PURCHASE DESCRIPTION

FOR

UNIVERSAL COUNTER W/RUBIDIUM

1.0 SCOPE

This section of the purchase description defines the requirements of a universal counter and rubidium frequency standard used to measure timing and frequency parameters of complex waveforms. The instrument described herein replaces the obsolete:

Fluke Universal Counter Model 6681R/676 with Options:

Opt 71 Rear Panel 0.1, 1, 5, and 10 MHz frequency outputs PM9622 Rack Flange Kit for use with supplied front handles

2.0 PERFORMANCE REQUIREMENTS

2.1 Channel A and B Specifications

2.1.1 Input Sensitivity (X1)

The input sensitivity of channels A and B shall be equal to or better than:

25 mV rms for sinewave inputs over their entire frequency spans 75 mV peak-to-peak pulse at minimum pulse width of 5 nS

2.1.2 Dynamic Range (X1)

The dynamic range of channels A and B shall be equal to or greater than:

75 mV to 5.0 V peak-to-peak, to 100 MHz, and 75 mV to 2.5 V peak-to-peak, for channel A inputs greater than 100 MHz

2.1.3 Trigger Level

2.1.3.1 Range

The trigger level range of channels A and B shall be equal to or greater than:

X1: -5 V to +5 V X10: -50 V to +50 V

2.1.3.1.1 Range Setting (X1)

2.1.3.1.1.1 Auto Trigger OFF

The trigger level range with auto trigger off shall be:

Preset: To 0 VDC nominal Adjustable: From -5 VDC to +5 VDC

2.1.3.1.1.2 Auto Trigger ON

The trigger level range with auto trigger on shall be:

Preset: To nominal 50% point of input signal Adjustable: Nominally between the positive and negative peaks of the input signal.

2.1.3.2 Resolution

The trigger level resolution for channels A and B shall be equal to or better than:

X1: 10 mV X10: 100 mV

2.1.3.3 Accuracy (X1)

The trigger level accuracy of the instrument for channels A and B on X1 attenuation and DC coupling shall be equal to or better than:

+/-(20 mV + 0.5% of reading)

2.1.3.4 Trigger Level Digital Voltmeter

The instrument shall include a trigger level digital voltmeter, which can measure and display the trigger levels of channels A and B.

2.1.3.5 Auto Trigger (X1)

2.1.3.5.1 Operation

The auto trigger function of the counter shall cause the counter to automatically select the 10% and 90% rise/fall time trigger points, 50% phase trigger points, or the operator's preset value for inputs to channels A and B.

2.1.3.5.2 Frequency Range (50% duty cycle)

The channels A and B auto trigger frequency range for a 50% duty cycle signal input shall be equal to or better than:

DC coupled: 30 Hz to 100 MHz AC coupled and 1 Megohm input impedance: 30 Hz to 100 MHz AC coupled and 50 ohms input impedance: 200 KHz to 100 MHz

2.1.3.5.3 Minimum signal

The minimum signal input for auto trigger shall not exceed 100 mV rms.

2.1.3.5.4 Duty cycle range

The auto trigger duty cycle range shall include from 10% to 90% duty cycles.

2.1.4 Coupling

The coupling shall be AC or DC switchable.

2.1.5 Input Impedance

The input impedance of channels A and B shall be independently settable to 1 Megohm shunted by less than 35 pF and 50 ohms, when separate signals are applied to each channel; and 1 Megohms shunted by less than 50 pF, when connected for COMMON A input.

2.1.6 Attenuator

The instrument shall be capable of X1 and X10 signal attenuation of the input signals to channels A and B.

2.1.7 Slope

The slope of the trigger for inputs to channels A and B shall be positive and negative, independently selectable for each channel.

2.1.8 Channel Input

The instrument shall permit the operator to select the inputs to channels A and B as COMMON A or SEPARATE.

2.1.9 Maximum Operating Level

The instrument shall be capable of accepting signal inputs to channels A and B over a dynamic range of -50 VDC to +50 VDC with the appropriate attenuator setting.

2.1.10 Functions

2.1.10.1 Frequency

2.1.10.1.1 Range

The instrument shall be capable of measuring frequencies from 1 Hz to 300 MHz on channel A and from 1 Hz to 100 MHz on channel B.

2.1.10.1.2 Least Significant Digit Displayed

The LSD displayed for frequency measurements shall be equal to or better than:

(Frequency X 1 nS)/Gate Time

2.1.10.1.3 Resolution

The attainable resolution of frequency measurements shall be equal to or better than:

+/-(2 X LSD + (1.4 X Frequency X Trigger Error)/Gate Time)

2.1.10.1.4 Accuracy

The total errors of the frequency measurements shall not exceed:

+/-(Resolution + (Time Base Error X Frequency))

2.1.10.2 Period

2.1.10.2.1 Range

The instrument shall be capable of measuring periods from 10 nS to 1000 S.

2.1.10.2.2 Least Significant Digit Displayed

The Least Significant Digit (LSD) displayed for period measurements shall be equal to or better than:

(Period X 1 nS)/Gate Time

2.1.10.2.3 Resolution

The attainable resolution of period measurements shall be equal to or better than:

+/-(2 X LSD + (1.4 X Period X Trigger Error)/Gate Time)

2.1.10.2.4 Accuracy

The total errors of the period measurements shall not exceed:

+/-(Resolution + (Time Base Error X Period))

2.1.10.3 Time Interval

2.1.10.3.1 Range

The instrument shall be capable of measuring time intervals (TI) from 10 nS to 1000 S.

2.1.10.3.2 Least Significant Digit Displayed

The LSD displayed for time interval measurements shall be equal to or better than 1 nS.

2.1.10.3.3 Resolution

The resolution of time interval measurements shall be equal to or better than:

+/-(2 X LSD + START Trigger Error + STOP Trigger Error)

2.1.10.3.4 Accuracy

The sum of the errors in time interval measurements shall not exceed:

+/-((Resolution) + (Time Base Error X Time Interval) + (Trigger Level Timing Error)+(2 nS))

2.1.10.4 Rise and Fall Time

2.1.10.4.1 Range

The instrument shall be capable of rise time and fall time measurements over the range of 20 nS to 10 mS.

2.1.10.4.2 Minimum Pulse Height

The minimum pulse height for rise time and fall time measurements shall not exceed 500 mV peak-to-peak.

2.1.10.4.3 Minimum Width at Peak of Signal

The minimum width at peak of signal required for rise time and fall time measurements shall not exceed 20 nS.

2.1.10.4.4 Duty Cycle Range

The instrument shall be capable of measuring rise time and fall time for input signals with a duty cycle range of between 20% and 80%.

2.1.10.4.5 Least Significant Digit Displayed

The LSD displayed for rise time and fall time measurements shall be equal to or better than 1 nS.

2.1.10.4.6 Resolution

The resolution of rise time and fall time measurements shall be equal to or better than:

+/-((2 X LSD) + (START Trigger Error) + (STOP Trigger Error))

2.1.10.4.7 Accuracy

The sum of the errors in rise time and fall time measurements shall not exceed:

+/-((Time Interval Accuracy)+ (Trigger Level Setting Error at 10% point)+ (Trigger Level Setting Error at 90% point))

2.1.10.4.8 Input Mode

The instrument shall automatically set to COMMON A input with 10% and 90% trigger levels.

2.1.10.5 Ratio

2.1.10.5.1 Range

The instrument shall be capable of ratio A/B measurements at frequencies up to 100 MHz.

2.1.10.5.2 Least Significant Digit Displayed

The LSD displayed for ratio measurements shall be equal to:

Ratio/(Higher Frequency X Gate Time)

2.1.10.5.3 Resolution

The resolution of ratio A/B measurements shall be equal to or better than:

+/-(LSD + (Higher Frequency Trigger Error X Ratio)/Gate Time)

2.1.10.5.4 Accuracy

The accuracy of ratio A/B measurements shall be equal to or better than:

+/-(LSD + (Higher Frequency Trigger Error X Ratio)/Gate Time)

2.2 Channel C Specifications

2.2.1 Deleted

2.2.2 Operating Input Voltage Range

The dynamic range of the signal inputs to channel C shall include:

100MHz to 300MHz: 20mV rms to 12V rms 0.3GHz to 2.5GHz: 10mV rms to 12V rms 2.5GHz to 2.7GHz: 20mV rms to 12V rms

2.2.3 Coupling

The input signals to channel C of the instrument shall be AC coupled.

2.2.4 Impedance

The input impedance of the input to channel C of the instrument shall be 50 ohms nominally with a VSWR of less than 3:1.

2.2.5 Damage Level

The damage level of channel C of the instrument shall exceed +/-8 V (DC + AC peak). The channel C input shall be fuse protected.

2.2.6 Functions

2.2.6.1 Frequency

2.2.6.1.1 Range

The channel C input of the instrument shall enable it to measure frequencies between the 200 MHz and 2.7 GHz.

2.2.6.1.2 Least Significant Digit Displayed

The LSD displayed for channel C frequency measurements shall be equal to or better than:

(Frequency X 1 nS)/Gate Time

2.2.6.1.3 Resolution

The attainable resolution of channel C frequency measurements shall be equal to or better than:

+/-(2 X LSD + (1.4 X Frequency X Trigger Error)/Gate Time)

2.2.6.1.4 Accuracy

The total errors of the channel C frequency measurements shall not exceed:

+/-(Resolution + (Time Base Error X Frequency))

2.2.6.2 Ratio C/A

2.2.6.2.1 Range

The instrument shall be capable of Ratio C/A measurements where the input to channel A ranges from 1 to 160 MHz; and the input to channel C ranges from 100 MHz to 2.7 GHz.

2.2.6.2.2 Least Significant Digit Displayed

The LSD displayed for ratio measurements shall be equal to:

Ratio/(Higher Frequency X Gate Time)

2.2.6.2.3 Resolution

The resolution of ratio C/A measurements shall be equal to or better than:

+/-(LSD + (Higher Frequency Trigger Error X Ratio)/Gate Time)

2.2.6.2.4 Accuracy

The accuracy of ratio C/A measurements shall be equal to or better than:

+/-(LSD + (Higher Frequency Trigger Error X Ratio)/Gate Time)

2.3 Rubidium High Stability Timebase and Frequency Reference Outputs

The instrument shall contain a rubidium high stability timebase.

2.3.1 Output Frequencies

The instrument shall provide rear panel outputs phase locked to the timebase at 10 MHz, 5 MHz, 1 MHz and 100 KHz.

2.3.2 Frequency Characteristics

2.3.2.1 Timebase Accuracy/Fractional Frequency Offset

The output frequency shall not change by more than 3 X 10 to the minus tenth per day after a 24 hour warm-up period and where the ambient temperature does not vary by more than +/-5 degrees C over that same period.

2.3.2.2 Phase Noise

The Single Side Band (SSB) phase noise in a 1 Hz Bandwidth shall be less than -140 dBc at 1000 Hz from the carrier frequency.

2.3.2.3 Retrace

The output frequency of the unit shall be within 1 X 10 to the minus 10 of the original set frequency within a 1 hour warm-up period after 24 hours off time. The output frequency of the unit shall be within 5 X 10 to the minus 11 of the original set frequency within a 24 hour warm-up period.

2.3.2.4 Output amplitude

The output amplitude available from all frequency outputs shall exceed 1 V p-p into 50

3.0 FUNCTIONAL REQUIREMENTS

3.1 Interface Capability

The instrument shall be equipped with an IEEE-488.2-1992 interface. The interface shall incorporate all of the IEEE-488.2 Common Commands and Queries. Any function that can be entered via the front panel shall be controllable via the interface, with the exception of power on/off. In addition, any or all of the functions which can be displayed, can be queried and sent over the interface. The GPIB Address shall be selectable from a system menu.

3.2 Measuring Functions

Measuring functions must include: phase, duty factor, rise/fall-time, peak voltage, frequency, period

3.3 Self-Tests

The instrument must run a self-test during every power-on or reset.

3.4 Calibration Requirements

The instrument must be capable of being calibrated with assets already in PMEL inventory. PMEL will perform the calibration.

4.0 PHYSICAL/MECHANICAL REQUIREMENTS

4.1 Dimensions

The dimensions of the mainframe shall not exceed:

Height : 5.25 Inches Maximum (excluding feet) Depth : 20.0 Inches Maximum Width : Instrument plus rack mounting shall fit within a standard EIA 19 inch rack

4.2 Physical Mounting

The instrument shall be furnished with accessories necessary for mounting in a standard 19 inch Electronic Industries Association (EIA) rack.

5.0 CONTROLLER REQUIREMENTS

5.1 Firmware

When firmware or software upgrade is anticipated by the manufacturer during the lifecycle of this contract, the contractor shall contact AFMETCAL for concurrence. If AFMETCAL concurs with the proposed upgrade all previous units shall be updated to this upgrade. All firmware or software provided under this contract shall be at the same version, revision and revision date at the completion of the contract.

6.0 OPERATOR’S MANUAL

As required in the DD 1423 and the Data Item Descriptions, an Operator’s Manual shall be delivered on CD with each unit and must contain instructions for using all of the functions available.

7.0 TESTING

All units will be delivered to the AFPSL for calibration testing in accordance with Com Data.