Hp 3326a Service Manual

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• 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 Approved for public release; distribution is unlimited REPORTING OF ERRORS AND RECOMMENDED IMPROVEMENTS You can help improve this publication. If you find any mistakes or if you know of a way to improve the procedure, please let us know. • Final procedure. IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. Calibration of Synthesizer/Function Generator, Hewlett-Packard, Models 3325A( ) and 3325B( ).

The manufacturer's manuals and TM 11-6625-3065-14 were used as the prime data sources in compiling these instructions. Referred to as the TI (test instrument) throughout this bulletin. • Test instrument parameters Harmonic distortion (relative to fundamental at full output) Amplitude modulation Square wave Ramp retrace Frequency Sine wave Square wave Triangle Positive slope ramp Negative slope ramp Phase offset Amplitude Amplitude accuracy with no attenuation (attenuator range 1) into 50 load (no dc offset ) Flatness with no attenuation. • TB 9-6625-2049-35 Test instrument parameters Amplitude accuracy with offset attenuation (range 1) into 50 load Attenuator accuracy (these errors are additive with the amplitude accuracy errors) Amplitude output Amplitude (option 002) (high voltage output) Dc offset Dc offset (option 002) Dc plus ac Not verified below 50 Hz. Accessories Required. 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: feedthrough termination, Hewlett-Packard, Model 11048C. Minimum Specifications of Equipment Required Common name AUDIO ANALYZER FREQUENCY COUNTER. • TB 9-6625-2049-35 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. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. 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 50.

(3) Press keys and enter values using DATA keys as listed in (a) through (h) below: (a) SIGNAL off (option 002 not lit). • TB 9-6625-2049-35 (a) 50 Hz. (b) ENTRY AMPTD.

(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 470. 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. (e) ENTRY AMPTD. • TB 9-6625-2049-35 (a) SIGNAL off (option 002 not lit). Ukrupnennij smetnij raschet obrazec. (b) FUNCTION square wave. (c) ENTRY FREQ. (e) ENTRY AMPTD. (2) Connect TI SIGNAL to oscilloscope CH 1.

(3) Set oscilloscope CH 1 COUPLING 50 (4) Set oscilloscope controls for duty cycle measurement. • (4) Set oscilloscope controls to measure ramp retrace time from the 90 to 10 percent points. Ramp retrace time will be 3 s.

(5) Press FUNCTION negative ramp key and repeat (4) above. No adjustments can be made. • TB 9-6625-2049-35 (15) Set frequency counter controls to measure frequency.