CSS_02-2251A_FINAL.docx

digital oscilloscope CALIBRATION STANDARD SPECIFICATION CSS 02-2251

CSS 02-2251A

CALIBRATION STANDARDS SPECIFICATION PROCUREMENT PACKAGE

Digital oscilloscope

DISTRIBUTION STATEMENT A. APPROVED FOR PUBLIC RELEASE

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

APR 2016

CALIBRATION STANDARDS SPECIFICATION PROCUREMENT PACKAGE

digital oscilloscope

Prepared by:

Microwave/Electro-Optic Standards (MS 32) Measurement Science Department Naval Surface Warfare Center, Corona Division P.O. Box 5000 Corona, CA 92878-5000

DEPARTMENT OF THE NAVY

METROLOGY AND CALIBRATION PROGRAM

Table of Contents

DIGITAL OSCILLOSCOPE CALIBRATION STANDARD SPECIFICATION CSS 02-2251

i

1.0 SCOPE

1.1 General. This document specifies the minimum requirements for a digital oscilloscope. This equipment shall be of commercial design. It is intended to be used by Navy personnel in shipboard and shore-based laboratories and for on-site, in-place calibration. The equipment will be used primarily on bench top applications to calibrate various test instruments such as signal generators and test sets. For the purpose of this calibration standards specification (CSS), the digital oscilloscope shall be referred to as the "oscilloscope".

1.2 Usage. Equipment covered by this CSS is intended for use in testing equipment and systems in the worldwide controlled environments in which military equipment is operated. Equipment will also be subjected to conditions aboard land, sea, and air vehicles, both military and commercial, during periods of transportation and storage. The requirements of this CSS are tailored to the intended use of the equipment. Specific requirements of MIL-PRF-28800F, as identified in this CSS, are invoked according to the class of equipment.

1.3 Class. The oscilloscope shall conform to Class 4 requirements in accordance with MIL-PRF-28800F for Navy shipboard and shore-based laboratory use as specified in this CSS.

2.0 APPLICABLE DOCUMENTS

2.1 Reference documents. The following documents form a part of this CSS to the extent specified herein. Unless otherwise indicated, the issues of these documents shall be those in effect on the date of this solicitation.

DEPARTMENT OF DEFENSE specifications, STANDARDS, AND HANDBOOKS

(Copies of DoD documents are available online at http://assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)

institute of electrical and electronics engineers (ieee)

(Copies of IEEE documents are available from http://www.ieee.org or IEEE Service Center, 445 Hoes Lane, Piscataway, NJ 08854-1331.)

International Electrotechnical Commission (IEC)

(Copies of IEC documents are available online at http://www.iec.ch/ or EC publications are available in the US from the Sales Department. American National Standards Institute, 11 West 42nd Street,113 Floor, New York, NY 10036, USA.)

LAN EXTENsIONS FOR INSTRUMENTATION (LXI) CONSORTIUM LXI Standard Revision 1.3-2008 - LAN Extensions for Instrumentation (LXI) Standard (Copies of LXI documents are available online at http://www.lxistandard.org or LXI Consortium, PO Box 1016, Niwot, CO 80544-1016.)

STANDARD COMMANDS FOR PROGRAMMABLE INSTRUMENTS (SCPI)

CONSORTIUM

SCPI Volume I -1999 - Standard Commands for Programmable Instruments (SCPI) (Copies of SCPI documents are available online at http://www.ivifoundation.org or IVI Foundation Corporate Office, PO Box 1016, Niwot, CO 80544-1016.)

2.2 Order of Precedence. In the event of conflict between the text of this CSS and the references cited herein, the text of this CSS shall take precedence. Nothing in this CSS, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.0 REQUIREMENTS

3.1 Safety. The oscilloscope shall comply with the safety requirements of IEC 61010-1. For safety, all accessible surfaces of the oscilloscope shall be at ground potential. The power cable shall include a safety ground conductor.

3.2 Interchangeability. A model number shall be designated for all units provided. All units and the replaceable assemblies, subassemblies, and parts comprising the units shall be interchangeable on a noninterference basis and shall cause no degradation of performance, unless alignment in-situ is required for the replaced components as part of the repair process and such alignment meets all maintainability requirements.

3.3 Materials Restricted for Navy Use. The materials and parts specified in a through g below shall not be used in equipment for the Navy except as specified herein.

a. Mercury, including mercury batteries

b. Radioactive material

c. Lithium batteries except for AA cell size or button type batteries

d. Organic materials prone to decay or promote growth of multi-celled organisms

e. Carcinogens, substances identified in the Occupational Safety And Health Act (OSHA) as cancer-producing substances

f. Flammable Materials

g. Explosive Materials

3.4 Operator Adjustments. The oscilloscope shall include built-in adjustments or compensating devices for any function or parameter that would exceed the specified tolerance within the calibration interval defined in 3.18.2 Calibration Interval. Under all specified service conditions the variation of any adjustment or control shall produce the desired control action to bring the equipment within tolerance.

3.5 Operator Controls and Indicators. Operator controls and indicators designed to present change-of-state information to the operator or respond to change of state conditions by the operator shall be readily accessible to the operator from the front of the oscilloscope. Any readings presented on the controls and indicators shall be available to the operator without conversion or calculation.

3.6 Connectors, Electric. Provision shall be made to ensure that connectors will be mated only with the appropriate counterparts. Where design considerations require close proximity of connectors of similar configuration, the mating connectors shall be suitably coded or marked. The live or hot side of unmated connectors shall be protected against shorting.

3.7 Wiring, Internal. Internal wiring practices shall be such that the wiring shall not be damaged during normal maintenance and calibration, if access to internal components is required.

3.8 Internal Cooling. The equipment shall be capable of operating without interruption for at least 24 hours at the maximum operating temperature without overheating, losing power, or otherwise exhibiting failure.

3.9 Digital Interface. The oscilloscope shall have a digital interface. The digital interface shall include an IEEE 488.2 General Purpose Interface Bus conforming to IEC 60488-2:2004/IEEE 488.2-1992 or an adapter to convert the digital interface to IEEE 488.2 with all of the functionality of IEEE 488.2. The digital interface shall have the programmable capability to control each device function including all ranges, modes, and levels. The digital interface shall support control of the device without the need for any proprietary drivers or software. The syntax and style of programming commands shall conform to the Standard Commands for Programmable Instruments (SCPI). Primary power control and other non-measurement functions need not be controllable through the digital interface.

3.10 Electrical Power Sources and Connections.

3.10.1 Nominal and Alternate Power Source. The oscilloscope shall operate at:

a. 120 Vrms

b. Single-phase 50 Hz and 60 Hz

c. A maximum power not to exceed 500 watts.

3.10.2 Steady-state Conditions. The performance and accuracy of the oscilloscope shall not be adversely affected when operated under any combination of conditions a through c below. Tolerance values are derived from, and referenced to, the nominal values specified for voltage and frequency as specified above. (For definitions of voltage waveform deviation factor and harmonics see MIL-PRF-28800F paragraph 6.5.1a Voltage waveform deviation factor and 6.5.1b Harmonics.)

a. The steady-state voltage tolerance shall be ±10%.

b. The steady-state frequency tolerance shall be ±5%.

3.10.3 Interruption of Power Source. Voltage or frequency interruptions shall not cause damage to the oscilloscope. A power source interruption is when the voltage falls in the range of 0 to 70% of nominal or frequency falls in the range of 0 to 90% of nominal. Oscilloscope performance is not required during interruption of the power source. After power interruptions of any duration, the oscilloscope shall automatically resume operation at either the last operating condition before interruption, or a default power-up condition.

3.10.4 Input Power Cable. The input power cable shall be a detachable power cable normally provided by the manufacturer.

3.10.5 Excessive Current Drain Protection. An automated safety mechanism (circuit breaker/fuse) shall be incorporated to automatically disconnect the oscilloscope in the event of current being drawn that is in excess of the oscilloscope rating.

3.11 Enclosure Physical Characteristics.

3.11.1 Mechanical Stability. The oscilloscope shall be designed for benchtop use to preclude tipping during normal handling and operation.

3.11.2 Handles. One or more handles shall be provided. The number and location of handles shall be such that the load distribution per handle shall not exceed 20 kg.

3.11.3 Front Cover. The enclosure shall include a front cover that can be stably mounted to protect the front panel when the oscilloscope is not in operation.

3.12 Warning Markings. Warning markings shall warn of the location, the nature, and the extent of a hazard. Letters of warning markings shall be of clearly legible gothic capitals. Warning markings shall have high contrast between the letter and background colors. The markings shall be as permanent as normal life expectancy of the oscilloscope, and located as close as possible to the point of danger.

3.13 Equipment identification. An identification plate shall be affixed to the equipment and shall include those items specified in a through d below:

a. Manufacturer name

b. Equipment model number with installed options

c. Equipment nomenclature

d. Serial number

3.14 Item Unique Identification (IUID). A two dimensional Item Unique Identification (IUID) data matrix conforming to MIL-STD-130 shall be included on the identification plate.

3.15 Environmental Requirements.

3.15.1 Warm-up. The oscilloscope shall comply with the specified performance requirements after a warm-up period of ≤ 30 minutes.

3.15.2 Temperature Not Operating. The oscilloscope shall conform to the specified performance and accuracy requirements after being stored at temperature ranging from 0 ºC to 40 ºC.

3.15.3 Temperature Operating. The oscilloscope shall conform to the specified performance and accuracy while operating in temperature ranging from 60ºF to 85 ºF (15.5 ºC to 29.4 ºC).

3.15.4 Humidity. The oscilloscope shall conform to the specified performance and accuracy in the condition where the relative humidity is 20% to 60%.

3.16 Performance Requirements.

3.16.1 Input Channels. The oscilloscope shall have 4 input channels mounted on the front panel to receive input signals with the following characteristics:

a. Channel Name. Each of the 4 input channels shall be named distinctly.

b. On/off Control. Each of the 4 input channels shall be settable to on or off independently.

c. Analog Bandwidth. The analog bandwidth of each of the 4 input channels shall be from DC to 500 MHz.

d. Limited Bandwidths. The oscilloscope shall be equipped with controls to set the upper limit of the bandwidth of each of the 4 input channels to some values less than the 500 MHz.

e. Connector Type. Each of the 4 input channels shall have a BNC-female connector mounted on the oscilloscope front panel.

f. Input Impedance. The input impedance of each of the 4 input channels shall be settable to either 50 Ω ± ≤1.5% or 1 MΩ ± ≤1%.

g. Input Coupling. The input coupling of each of the 4 input channels shall be settable to either DC or AC.

h. Color-coded Displayed Waveform. The displayed waveform of each input channel shall be coded with a distinct color.

3.16.2 Display Requirements. The display shall have the following features:

a. Touchscreen Requirement. The oscilloscope display shall be a touchscreen.

b. Voltage-versus-Time Display. The oscilloscope shall be capable of displaying voltage versus time, customarily called YT display, of the waveform(s) of up to 4 input-on channels on a graticule with 8 or 10 vertical voltage divisions versus 10 horizontal time divisions.

c. XY Display. The oscilloscope shall be capable to display the voltage of the input signal into a channel versus the voltage of the input signal into another channel, customarily called XY display, on a square graticule where the physical length of a voltage unit on the horizontal X axis equals to the physical length of a voltage unit on the vertical Y axis. At least one of the 4 input channels shall be designed to drive the horizontal X axis and another one of the 4 input channels shall be designed to drive the vertical Y axis, respectively.

d. Display Persistence. The persistence of the displayed waveform(s) shall be settable to infinite or off.

e. Display Intensity. The intensity of the displayed waveform(s) shall be settable from ≤10% to 100%.

f. Zoom Requirement. The oscilloscope shall be capable of displaying a zoom of a portion of a display waveform. The zoom function shall be performed either horizontally or vertically or both. The vertical zoom factor shall be settable from 1 to at least 100. The horizontal zoom factor shall be settable from 1 to at least 1000.

3.16.2.1 Cursor Requirements. The oscilloscope shall be equipped with the control to display either a pair of horizontal bar cursors, or a pair of vertical bar cursors, or both.

a. Horizontal Bar Cursor Shape. Each of the 2 horizontal bar cursors shall be a horizontal straight line stretching from the leftmost to the rightmost of the display screen.

b. Horizontal Bar Cursor Movement. The oscilloscope shall be equipped with controls to move each of the 2 horizontal bar cursors independently between the top and the bottom of the display screen.

c. Cursor Voltage Display. The oscilloscope shall display the voltage level of each of the 2 displayed horizontal bar cursors.

d. Vertical Bar Cursor Shape. Each of the 2 vertical bar cursors shall be a vertical straight line stretching from the top to the bottom of the display screen.

e. Vertical Bar Cursor Movement. The oscilloscope shall be equipped with controls to move each of the 2 vertical bar cursors independently between the leftmost and the rightmost of the display screen.

f. Cursor Time Display. The oscilloscope shall display the time interval from each of the 2 display vertical bar cursors to the trigger point.

3.16.3 Vertical Control Requirements. The vertical control requirements shall be as follows:

a. Minimum Vertical Sensitivity Setting. The minimum value of vertical sensitivity settings shall be ≤1 mV/division.

b. Maximum Vertical Sensitivity Setting. For input impedance of 50 Ω, the maximum value of vertical sensitivity settings shall be 1 V/division. For the input impedance of 1 MΩ, the maximum value of vertical sensitivity settings shall be 10 V/division.

c. Vertical Sensitivity Setting Sequence. The vertical sensitivity shall be settable using either control items displayed on the touchscreen or a knob.

d. Vertical Position Range. The vertical position range shall be from ≤-4 to ≥+4 vertical divisions for the oscilloscope with 8 vertical-division display and from ≤-5 to ≥+5 vertical divisions for the oscilloscope with 10 vertical-division display.

e. Vertical Offset Range. The vertical offset range shall be from ≤-4 to ≥+4 vertical divisions for the oscilloscope with 8 vertical-division display and ≤-5 to ≥+5 vertical divisions for the oscilloscope with 10 vertical-division display.

f. DC Gain Accuracy. The DC gain accuracy with both vertical position and vertical offset set to 0 V shall be ±≤2.0% of setting for the vertical sensitivities from 1 mV/div to 10 V/div.

g. Vertical Setting Display Requirement. The oscilloscope shall display, at a minimum, the following current settings of each input-on channel on the screen: V/division, impedance, coupling.

3.16.4 Horizontal Control Requirements. The vertical control requirements shall be as follows:

a. Minimum Horizontal Scale Setting. The minimum value of horizontal settings shall be ≤ 1 ns/division.

b. Maximum Horizontal Scale Setting. The maximum value of horizontal settings shall be ≥10 s/division.

c. Horizontal Scale Setting Sequence. The horizontal scale shall be settable using either control items displayed on the touchscreen or a knob.

d. Timebase Accuracy. The oscilloscope timebase accuracy shall be better than or equal to ±10 ppm.

e. Timebase Reference Input. The oscilloscope shall be equipped with an external timebase reference input to connect and synchronize the oscilloscope internal timebase with a 10-MHz external one. The timebase reference input shall have a BNC female connector.

f. Horizontal Position Control. The horizontal position control shall be able to move the displayed waveform, simulating continuous movement, up to at least 5 horizontal divisions either to the left or to the right of the screen center (often called the reference point of the displayed waveform).

g. Horizontal Setting Display Requirement. The oscilloscope shall display the current time/division setting on the screen.

3.16.5 Acquisition Requirements. The acquisition requirements shall be as follows:

a. Real-time Sample Rate. The input signal into each of the 4 input channels shall be sampled by an analog-to-digital converter (ADC) whose real-time sample rate shall be at least 5 Gsamples/s per channel regardless of the number of channels being turned on.

b. Waveform Arithmetic. The oscilloscope shall be equipped with controls to select, at a minimum, average and envelope arithmetic techniques.

c. Acquisition Setting Display Requirements. The oscilloscope shall display at least the following current acquisition settings on the screen: record length, either real-time sample rate, interpolated sample rate, decimated sample rate and/or resolution (resolution = 1 / sample rate).

d. Sample Rate Control. The oscilloscope shall be equipped with controls to keep the sample rate equal to the real-time sample rate and independent from the horizontal scale setting from ≤ 20 ns/division to ≥50 μs/division.

e. Acquisition Memory Depth (or Maximum Record Length). The acquisition memory depth (or maximum record length) shall be at least 40 MSamples for 1 on channel, 20 MSamples for 2 on channels, 10 MSamples for 3 or 4 on channels.

3.16.6 Trigger Control Requirements.

3.16.6.1 Trigger Mode. The oscilloscope shall be equipped with controls to set the trigger mode to either normal where the oscilloscope is triggered by an external signal or auto where the oscilloscope uses an internal timer to force a trigger after some time interval in which no trigger occurs.

3.16.6.2 External Trigger Sources. The external trigger sources shall be any of the 4 input channels and a separate external trigger input.

3.16.6.2.1 Input Channel Trigger. The input channel trigger shall be as follows:

a. Input Channel Trigger Characteristics. When used as an external trigger source, the characteristics of any of the 4 input channels shall be as specified in 3.16.1 Input Channels.

b. Input Channel Trigger Type. The oscilloscope shall be equipped with controls to set the trigger type of each of the 4 input channels at least to edge.

c. Input Channel Trigger Slope. The oscilloscope shall be equipped with controls to set the trigger slope of each of the 4 input channels to either positive (rising edge) or negative (falling edge).

d. Input Channel Trigger Level. The oscilloscope shall be equipped with controls to set the trigger level of each of the 4 input channels at least from -4 to +4 vertical divisions from the center of the display screen for the oscilloscope with 8 vertical-division display and -5 to +5 vertical divisions from the center of the display screen for the oscilloscope with 10 vertical-division display.

3.16.6.2.2 External Input Trigger. The external input trigger shall be as follows:

a. External Trigger Input Bandwidth. The analog bandwidth of the external trigger input shall be from DC to at least 250 MHz.

b. Connector Type. The external trigger input shall be realized with a BNC female connector.

c. External Trigger Input Impedance. The input impedance of the external trigger input shall be 50 Ω only, or 1 MΩ only, or settable to either 50 Ω or 1 MΩ.

d. External Input Trigger Type. The oscilloscope shall be equipped with controls to set the trigger type of the external trigger input to edge.

e. External Input Trigger Slope. The oscilloscope shall be equipped with controls to set the trigger slope of the external trigger input to either positive (rising edge) or negative (falling edge).

f. External Input Trigger Level. The oscilloscope shall be equipped with controls to set the trigger level of the external trigger input at least from -4 V to +4 V.

g. External Trigger Input Coupling. The input coupling of the external trigger input shall be DC.

3.16.6.3 Trigger Sequence. The oscilloscope shall be equipped with controls to set the trigger sequence either to one event (often called A-only where the oscilloscope acquires and displays the input signal after one valid trigger) or two events (often called A-then-B where the first event arms the oscilloscope trigger circuit and the second event triggers the oscilloscope).

3.16.6.3.1 A-only Sequence. The A-only sequence requirements shall be as follows:

a. A-only Trigger Source. In A-only sequence, the trigger source shall be any of those described in step 3.16.6.2 External Trigger Sources.

b. A-only Trigger Characteristics. The characteristics of the A-only trigger sources shall be as described in 3.16.6.2.1 Input Channel Trigger and 3.16.6.2.2 External Input Trigger.

3.16.6.3.2 A-then-B Sequence. The A-then-B sequence requirements shall be as follows:

a. A-then-B Trigger Sources. In A-then-B sequence, the A-event source and the B-event source shall be any of the 4 input channels.

b. A-then-B Trigger Characteristics. The characteristics of the A-then-B trigger sources shall be as described in 3.16.6.2.1 Input Channel Trigger.

c. A-then-B Delay by Time. In A-then-B sequence, the oscilloscope shall be equipped with controls to set a time delay following the A-event before the B-event can trigger.

d. A-then-B Delay by Events. In A-then-B sequence, the oscilloscope shall be equipped with controls to set a number of B-events to be ignored following the A-event before the B-event can trigger.

3.16.6.4 Horizontal Position Control. The oscilloscope shall be equipped with controls to move the trigger point continuously at least 5 horizontal divisions either to the left or to the right of the screen center (often called the reference point of the displayed waveform).

3.16.6.5 Trigger Offset or Horizontal Delay Control. The oscilloscope shall be equipped with controls to move the trigger point at least 500 seconds to the left of the screen center.

3.16.6.6 Trigger Holdoff. The oscilloscope shall be equipped with controls to set the trigger holdoff which is a waiting time interval after the current valid trigger before the next trigger can be recognized.

3.16.6.7 Trigger Point Indicator. The oscilloscope shall display a trigger point indicator which marks the trigger point on the displayed waveform.

3.16.7 Automatic Measurement Function Requirements. The automatic measurement function requirements shall be as follows:

a. Measurement Region. The oscilloscope shall be equipped with controls to set an automatic measurement function, as applicable, to perform on either the whole displayed waveform or gated region (a portion of the displayed waveform between the 2 vertical bar cursors).

b. Measurement Statistics. The oscilloscope shall be equipped with controls to perform and display the statistical maximum, statistical minimum and statistical mean of a specified number of measurements. The number of measurements shall be settable from 2 to at least 32768.

c. High. The oscilloscope shall be equipped with a control to be set to the High measurement function that automatically measures and displays the voltage level at the top of the displayed waveform or gated region.

d. Low. The oscilloscope shall be equipped with a control to be set to the Low measurement function that automatically measures and displays the voltage level at the bottom of the displayed waveform or gated region.

e. Amplitude. The oscilloscope shall be equipped with the control to be set to the Amplitude measurement function that automatically measures and displays the difference of the High minus the Low.

f. Maximum. The oscilloscope shall be equipped with a control to be set to the Maximum measurement function that automatically measures and displays the highest voltage level of the displayed waveform or gated region.

g. Minimum. The oscilloscope shall be equipped with a control to be set to the Minimum measurement function that automatically measures and displays the lowest voltage level of the displayed waveform or the gated region.

h. Peak-to-Peak. The oscilloscope shall be equipped with a control to be set to the peak-to-peak measurement function that automatically measures and displays the difference of the Maximum minus the Minimum of the displayed waveform or gated region.

i. RMS. The oscilloscope shall be equipped with a control to be set to the RMS measurement function that automatically measures and displays the root-mean-square voltage of the displayed waveform or gated region.

j. Positive Overshoot. The oscilloscope shall be equipped with controls to perform the positive overshoot measurement which is equal to [(Maximum - High) / Amplitude] x 100%.

k. Negative Overshoot. The oscilloscope shall be equipped with controls to perform the positive overshoot measurement which is equal to [(Low - Minimum) / Amplitude] x 100%.

l. Rise Time. The oscilloscope shall be equipped with a control to be set to the rise time measurement function that automatically measures and displays the time required for the leading edge of the first pulse in the displayed waveform or gated region to rise from the low reference value (default = 10%) to the high reference value (default = 90%) of the pulse amplitude.

m. Fall Time. The oscilloscope shall be equipped with a control to be set to the Fall time measurement function that automatically measures and displays the time required for the leading edge of the first pulse in the displayed waveform or gated region to fall from the high reference value (default = 90%) to the low reference value (default = 10%) of the pulse amplitude.

n. Period. The oscilloscope shall be equipped with a control to be set to the Period measurement function that automatically measures and displays the time required to complete the first cycle in the displayed waveform or gated region.

o. Frequency. The oscilloscope shall be equipped with a control to be set to the Frequency measurement function that automatically measures and displays the frequency of the first cycle in the displayed waveform or gated region.

p. Positive Pulse Width. The oscilloscope shall be equipped with a control to be set to the Positive pulse width measurement function that automatically measures and displays the time interval between the reference (default 50%) amplitude points of first positive pulse cycle in the displayed waveform or gated region.

q. Negative Pulse Width. The oscilloscope shall be equipped with a control to be set to the Negative pulse width measurement function that automatically measures and displays the time interval between the reference (default 50%) amplitude points of first negative pulse cycle in the displayed waveform or gated region.

r. Positive Duty Cycle. The oscilloscope shall be equipped with a control to be set to the Positive duty cycle measurement function that automatically measures and displays the ratio expressed as a percentage of the positive pulse width to the period of the first cycle in the displayed waveform or gated region.

s. Negative Duty Cycle. The oscilloscope shall be equipped with a control to be set to the Negative duty cycle measurement function that automatically measures and displays the ratio expressed as a percentage of the negative pulse width to the period of the first cycle in the displayed waveform or gated region.

t. Delay. The oscilloscope shall be equipped with a control to be set to the Delay measurement function that automatically measures and displays the time interval between the reference (default 50%) amplitude points of two specified edges.

u. Burst Width. The oscilloscope shall be equipped with a control to be set to the Burst width measurement function that automatically measures and displays the duration of one burst measured from the first edge to the last edge.

v. Reference Level. For the time measurements described in steps 3.16.7i Rise Time through 3.16.7u Burst Width, the oscilloscope shall be equipped with a control to set the reference voltage levels of the beginning point and the end point of the measured time interval.

3.16.8 Math Function Requirements. The math function requirements shall be as follows:

a. Channel Invert. The oscilloscope shall be equipped with a control to be set to the channel invert function that calculates and displays a waveform resulting from multiplying -1 with a designated waveform.

b. Channel Addition. The oscilloscope shall be equipped with a control to be set to the channel addition function that calculates and displays a waveform resulting from adding the amplitudes of the corresponding data points of two different waveforms.

3.16.9 Probe Requirements. The oscilloscope shall be delivered with four 10X passive voltage probes and two 1X passive voltage probes. The bandwidth of the 10X probes shall be from DC to 500 MHz. The bandwidth of the 1X probes shall be from DC to at least 15 MHz.

a. Probe Compensation Output. The oscilloscope shall be equipped with a probe compensation output whose connectors are compatible with the Probe Requirements specified above.

b. Probe Compensation Facilities. The oscilloscope shall be equipped with probe compensation facilities that provide connection and test signals, set up, process, and display of the probe compensation results.

3.16.10 Warranty Requirement. All units shall be provided with the manufacturer's standard commercial warranty. The minimum acceptable duration for such a warranty is one (1) year.

3.16.11 Preset Hardkey. The oscilloscope shall be equipped with a hardkey that sets the oscilloscope to a manufacturer default state.

3.16.12 Autoset Hardkey. The oscilloscope shall be equipped with a hardkey that automatically senses the input signals and sets up an appropriate display.

3.16.13 Hard Disk Drive. The oscilloscope shall be equipped with a hard disk drive of at least 130 GB.

3.16.14 USB Ports. The oscilloscope shall be equipped with at least 2 USB 2.0 connectors.

3.16.15 Save Function. The oscilloscope shall be capable to save at least screen shot files and self-test diagnosis.

3.17 Maintainability.

3.17.1 Self-test Capability. The oscilloscope shall be able to perform and display self-test information. The information provided shall indicate if the oscilloscope is operating within the performance specification. If the oscilloscope exceeds the performance specification bounds, the oscilloscope shall be capable of displaying the information identifying the associated lowest replaceable unit (LRU) failure causing the malfunction. Refer to MIL-PRF-28800F paragraph 6.5.2.26 Self-test for the definition of self-test.

3.17.2 Fault Isolation. The design of the oscilloscope shall permit isolation of faults.

3.17.3 Preventive Maintenance. Preventive maintenance shall not require more than 15 minutes per a 30-day period. Preventive maintenance shall not require breaking of the oscilloscope seams where calibration seals would normally be placed.

3.17.4 Maintenance Provisions. Equipment shall be as specified in a through d to facilitate maintenance:

a. Accessibility for Maintenance. The oscilloscope shall be designed to ensure that any necessary maintenance access can be accomplished utilizing ordinary tools. The oscilloscope shall be constructed so that no damage to any component shall occur and no permanent distortion to any structural member shall be caused during maintenance and calibration (performance verification and adjustment/alignment).

b. Maintenance and Calibration Aids. If required, circuit board extenders, special adapters, special tools, and patch or interface cables required for maintenance or calibration shall be provided with each oscilloscope. They shall be identified as a set with a unique part number. Stowage shall be in a reusable pouch or container.

c. Accessibility for Repair. The oscilloscope shall be designed so that Shop Repairable Assemblies (SRAs) can be removed without removing other hardwired subassemblies or components. There shall be no need to unsolder cables or interconnecting wiring to remove SRAs. Assemblies designed primarily to distribute power and signals to other components are excluded from this requirement. When troubleshooting/repair information is provided and access to both sides of SRAs is necessary, the design of the oscilloscope shall facilitate this directly or through extender cards.

d. Adjustment/Alignment. The oscilloscope shall be provided with any necessary instructions/software (to include programming commands, if not explicitly company proprietary and non-releasable to the Navy or any other commercial customer) needed to adjust/align the oscilloscope so that the oscilloscope meets its performance specifications after repair or due to the oscilloscope failing performance verification.

Accessibility for Adjustment. The oscilloscope design shall permit adjustments of components that are changeable without removing any component, printed circuit cards, or subassembly. The use of extender cards is permitted. (Example: Access will be provided to potentiometers that control the accuracy of specified parameters.)

Alignment Instructions/Software. If the oscilloscope has alignment data stored in memory (example: EEPROM, data files, DACs, etc.) that is necessary for the oscilloscope to meet its performance specification and modification of this alignment data is necessary after repair or a calibration failure, the oscilloscope shall be designed and information provided so that the alignment can be performed by the Navy.

i. This alignment information provided shall include any necessary software (preferably software commands) usable via any allowable communications interface specified in this document, e.g. IEEE-488 data bus, and usage instructions required to perform an alignment (to include any necessary setup instructions/software commands to put the oscilloscope into the alignment mode, instructions/software commands necessary to gather new alignment data, along with any software algorithms required to format the alignment data into the appropriate data required by the oscilloscope, and any instructions/software commands necessary to reprogram the oscilloscope with the new alignment data).

ii. If the alignment software operates with external calibration standards, it shall be able to use existing Navy calibration standards that meet all necessary minimum performance requirements to satisfy a traceable calibration without modification. Otherwise, the manufacturer shall supply the explicit instructions/software commands and any necessary algorithms for the Navy to develop its own organic alignment support using existing Navy calibration standards.

3.17.5 Firmware Updates. The oscilloscope shall be designed to allow for the Navy to update the oscilloscope firmware. The firmware update process shall use any common interface path supported by the Navy (e.g. the USB or CD-ROM/DVD drive available with the device).

3.18 Calibration. The oscilloscope shall meet the calibration requirements as specified below in 3.18.1 Calibration Certificate through 3.18.3 Calibration Procedure. For the purpose of this CSS, calibration refers to the process of comparing a test instrument with a calibration standard to determine the indicated error at specified test points. Alignment refers to the process of characterizing and adjusting a test instrument to cause the test instrument to indicate within its specified accuracy limits.

3.18.1 Calibration Certificate. The oscilloscope provided under this CSS shall have a current calibration certificate, with a calibration data sheet, traceable to the National Institute of Standards and Technology (NIST).

3.18.2 Calibration Interval. The minimum interval between calibrations shall be 12 months. At the end of this interval, a minimum of 85 percent of the units shall remain in tolerance. The manufacturer shall provide historical data to support the oscilloscope calibration interval.

3.18.3 Calibration Procedure. A calibration procedure in accordance with best commercial practices shall be provided.

3.19 Reliability. The design of the oscilloscope shall be such that under normal use and operation the oscilloscope does not fail within 1500 hours of operation with a statistical certainty of 95%. In addition, the oscilloscope must maintain an 85% in tolerance condition for a period of one year. The manufacturer shall provide a summary of maintenance or warranty records to establish the validity of the statistical assertions. If records of the actual oscilloscope model offered are not available, records from a similar model may be substituted. The manufacturer shall be able to reasonably establish the claim that the offered equipment shall provide reliability similar to the model used to provide substitute records.

3.20 Warranty Label. The oscilloscope shall have a warranty label that reflects the start and end dates of the warranty. Warranty shall be a minimum of one (1) year.

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