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*TB 9-6625-2049-35
SUPERSEDED COPY DATED 15 JANUARY 1996
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
SYNTHESIZER/FUNCTION GENERATOR
HEWLETT-PACKARD
MODELS 3325A( ) AND 3325B( )
Headquarters, Department of the Army, Washington, DC
2 January 2001
Approved for public release; distribution is unlimited
REPORTING OF ERRORS AND RECOMMENDED IMPROVEMENTS
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TB 9-6625-2049-35 Paragraph Page SECTION II CALIBRATION PROCESS - Continued I. Triangle and ramp amplitude ............................ 16 17 Dc offset............................................................... 17 18 Dc offset with ac.................................................. 18 19 High voltage output option 002 only................... 19 20 Power supply ....................................................... 20 21 Final procedure ........................
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TB 9-6625-2049-35 Table 1. Calibration Description Test instrument parameters Performance specifications 1 Harmonic distortion Fundamental frequency: 0.1 Hz To 50 kHz (relative to fundamental at Accuracy: No harmonic greater than -65 dB full output) Fundamental frequency: 50 to 200 kHz Accuracy: No harmonic greater than -60 dB Fundamental frequency: 200 kHz to 2 MHz (200 kHz to 1 MHz for option 002) Accuracy: No harmonic greater than -40 dB Fundamental frequency: 2 to 15 MH
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TB 9-6625-2049-35 Table 1. Calibration Description - Continued Test instrument parameters Performance specifications Amplitude accuracy with dc Tolerance relative to offset and no attenuation programmed amplitude (range 1) into 50Ω load Sine wave: .001 Hz to 100 kHz ±0.3 dB Square: .001 Hz to 100 kHz ±3% Triangle: .001 Hz to 2 kHz ±4% 2 kHz to 10 kHz ±6% Ramps: .001 Hz to 500 Hz ±4% 500 Hz to 10 kHz ±11% Tolerance relative to Function and frequency range programm
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TB 9-6625-2049-35 5. Accessories Required. The accessories required for this calibration are common usage accessories, issued as indicated in paragraph 4 above, and are not listed in this calibration procedure. The following peculiar accessory is also required for this calibration: 50Ω feedthrough termination, Hewlett-Packard, Model 11048C. Table 2. Minimum Specifications of Equipment Required Manufacturer and model Common name Minimum use specifications (part number) AUDIO ANALYZE
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TB 9-6625-2049-35 SECTION III CALIBRATION PROCESS 6. Preliminary Instructions a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration process. Personnel should become familiar with the entire bulletin before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. c. Unless otherwise specified, verify the result of each test and, whenever the test requirement is not met,
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TB 9-6625-2049-35 8. Harmonic Distortion a. Performance Check (1) Connect TI EXT REF IN 1, 10 MHz to spectrum analyzer 10 MHz REF IN/OUT. (2) Connect TI SIGNAL to spectrum analyzer INPUT 50Ω Ω. (3) Press keys and enter values using DATA keys as listed in (a) through (h) below: (a) SIGNAL off (option 002 not lit). (b) FUNCTION sine wave. (c) ENTRY AMPTD. (d) -20 dBm. (e) ENTRY DC OFFSET. (f) 0 VOLT. (g) ENTRY FREQ. (h) 20 MHz. (4) Adjust spectrum analyzer controls to
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TB 9-6625-2049-35 (a) 50 Hz. (b) ENTRY AMPTD. (c) 10 VOLT. (13) Set audio analyzer to measure distortion in dB. Audio analyzer indication will be ≤-65 dB. (14) Perform (15) through (19) below for option 002 only. (15) Connect equipment as shown in figure 1 and set resistance standard to 470Ω. Figure 1. Harmonic distortion - equipment setup. (16) Press keys and enter values using DATA keys as listed in (a) through (e) below: (a) SIGNAL on. (b) ENTRY FREQ. (c) 25 kHz. (
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TB 9-6625-2049-35 9. Amplitude Modulation Distortion a. Performance Check (1) Press keys and enter values using DATA keys as listed in (a) through (i) below: (a) SIGNAL off (option 002 not lit). (b) FUNCTION sine wave. (c) ENTRY FREQ. (d) 1 MHz. (e) ENTRY AMPTD. (f) 3 VOLT. (g) ENTRY DC OFFSET. (h) 0 VOLT. (i) Blue then AM ON. (2) Connect equipment as shown in figure 2. Figure 2. AM distortion - equipment setup. (3) Set audio analyzer for a 50Ω (SPCL 75), 10 kHz, 2.5
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TB 9-6625-2049-35 (a) SIGNAL off (option 002 not lit). (b) FUNCTION square wave. (c) ENTRY FREQ. (d) 1 MHz. (e) ENTRY AMPTD. (f) 1 V RMS. (2) Connect TI SIGNAL to oscilloscope CH 1. (3) Set oscilloscope CH 1 COUPLING 50Ω Ω to ON. (4) Set oscilloscope controls for duty cycle measurement. Duty cycle will be between 49.7 and 50.3 percent. (5) Enter 10 VOLT using DATA keys. (6) Set oscilloscope controls for rise time measurement. Rise time will be ≤20 ns. (7) Repeat (6)
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TB 9-6625-2049-35 (4) Set oscilloscope controls to measure ramp retrace time from the 90 to 10 percent points. Ramp retrace time will be ≤3 μs. (5) Press FUNCTION negative ramp key and repeat (4) above. b. Adjustments. No adjustments can be made. 12. Frequency Accuracy a. Performance Check (1) Connect TI SIGNAL to frequency counter CHANNEL A. (2) Press keys and enter values using DATA keys as listed in (a) through (f) below: (a) SIGNAL off (option 002 not lit). (b) FUNCTION s
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TB 9-6625-2049-35 (15) Set frequency counter controls to measure frequency. If frequency counter does not indicate between 59.99970 and 60.00030 MHz, perform b below. b. Adjustments (1) Disconnect TI rear panel 10 MHz OVEN OUTPUT from EXT REF IN option 001 only. (2) Connect frequency counter CHANNEL A to TI rear panel AUX 21-60 MHz. (3) Press keys and enter values using DATA keys as listed in (a) through (c) below: (a) FUNCTION sine wave. (b) ENTRY FREQ. (c) 60 MHz. (4) Adju
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TB 9-6625-2049-35 (12) Adjust A9R7 Fine Adj. (fig. 3) and A9 Coarse Adj. (fig. 3) for a minimum indication on frequency difference meter. (13) Disconnect TI from frequency difference meter. (14) Reconnect TI rear panel 10 MHz OVEN OUTPUT to EXT REF IN. 13. Phase Increment a. Performance Check (1) Press keys and enter values using DATA keys as listed in (a) through (f) below: (a) SIGNAL off (option 002 not lit). (b) FUNCTION sine wave. (c) ENTRY FREQ. (d) 100 kHz. (e) ENTRY
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TB 9-6625-2049-35 (6) Adjust frequency counter sample rate control to HOLD and press RESET pushbutton. Record frequency counter indication. (7) Press ENTRY PHASE key and enter -1 deg using DATA keys. (8) Press frequency counter RESET pushbutton and record frequency counter indication. (9) Determine the difference between indication recorded in (6) above and indication recorded in (8) above. The difference will be between 22.22 and 33.34 ns. (10) Enter -10 deg using DATA keys. (11
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TB 9-6625-2049-35 Table 3. Amplitude Test instrument settings Multimeter indications ENTRY AMPTD ENTRY FREQ (V ac) 3.536 V RMS 1 kHz 3.495 3.577 3.536 V RMS 100 kHz 3.495 3.577 1.061 V RMS 100 kHz 1.048 1.073 1.061 V RMS 1 kHz 1.048 1.073 1.061 V RMS 100 Hz 1.048 1.073 1 .3536 V RMS 100 Hz 0.3416 0.3660 .3536 V RMS 1 kHz 0.3416 0.3660 .3536 V RMS 100 kHz 0.3416 0.3660 1 Press ENTRY DC OFFSET key and enter 1 mV using DATA keys. (5) Press keys and enter values u
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TB 9-6625-2049-35 Table 4. Flatness Test instrument and measuring receiver settings (MHz) 1 2 4 6 8 10 12 14 16 18 20 b. Adjustments. No adjustments can be made. 15. Square Wave Amplitude and Flatness a. Performance Check (1) Connect TI SIGNAL to multimeter INPUT HI and LO using 50Ω feedthrough termination. (2) Press keys and enter values using DATA keys as listed in (a) through (i) below: (a) SIGNAL off (option 002 not lit). (b) ENTRY DC OFFSET. (c) 0 VOLT.
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TB 9-6625-2049-35 (a) 1 kHz. (b) ENTRY AMPTD. (c) 1 V RMS. (d) AMPTD CAL. (7) Multimeter will indicate between 0.99 and 1.01 V ac. (8) Disconnect TI from multimeter. (9) Connect TI SIGNAL to oscilloscope CH 1 using 50Ω feedthrough termination. (10) Set oscilloscope controls to measure square wave amplitude. Record oscilloscope indication. (11) Press ENTRY FREQ key and enter 1 MHz using DATA keys. (12) Set oscilloscope controls to measure square wave amplitude. Oscilloscope
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TB 9-6625-2049-35 (6) Enter 10 kHz using DATA keys. Multimeter will indicate between 2.742 and 3.032 V ac. (7) Press keys and enter values using DATA keys as listed in (a) through (c) below: (a) FUNCTION positive ramp. (b) 100 Hz. (c) AMPTD CAL. (8) Multimeter will indicate between 2.843 and 2.931 V ac. (9) Enter 499 Hz using DATA keys. Multimeter will indicate between 2.843 and 2.931 V ac. (10) Enter 501 Hz using DATA keys. Multimeter will indicate between 2.598 and 3.176
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TB 9-6625-2049-35 Table 5. Dc Offset - Continued Test instrument Multimeter indications DC OFFSET (V dc) settings Min Max 14.99 mV 0.01493 0.01505 -14.99 mV -0.01505 -0.01493 4.999 mV 0.004979 0.005019 -4.999 mV -0.005019 -0.004979 1.499 mV 0.001479 0.001519 -1.499 mV -0.001519 -0.001479 NOTE Perform (8) through (11) below for option 002 only. (8) Remove 50Ω feedthrough termination from equipment setup. (9) Press SIGNAL key on. (10) Enter 20 VOLT using DATA ke
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TB 9-6625-2049-35 (4) Enter -4.5 VOLT using DATA keys. Multimeter will indicate between -4.35 and -4.65 V dc. (5) Press ENTRY FREQ key and enter 999.9 kHz using DATA keys. Multimeter will indicate between -4.44 and -4.56 V dc. (6) Press ENTRY DC OFFSET key and enter 4.5 VOLT using DATA keys. Multimeter will indicate between 4.44 and 4.56 V dc. (7) Press FUNCTION square wave key. Multimeter will indicate between 4.44 and 4.56 V dc. (8) Enter -4.5 VOLT using DATA keys. Multimete
