HP 3325B, 3325A manual Final Procedure, Power supply assembly A2 test instrument top view

Page 22

TB 9-6625-2049-35

Figure 5. Power supply assembly A2 – test instrument top view.

(5)Press presently active FUNCTION key to remove ac output and activate ENTRY DC OFFSET key (lit).

(6)Enter 0 VOLT using DATA keys and press AMPTD CAL key.

(7)Connect multimeter INPUT HI to TP AMP OUT (fig. 3) and LO to circuit board

ground.

NOTE

The voltages measured in (1) through (3) above may be adjusted out of tolerance by (8) through (11) below. This is not a cause for concern.

(8)Adjust R40 (fig. 3) until digital multimeter indicates less than 5 mV dc (R).

(9)Connect multimeter INPUT HI and LO to TI SIGNAL. Do not use 50Ω feedthrough termination.

(10)Enter 5 VOLT using DATA keys.

(11)Press AMPTD CAL key. Adjust R22 (fig. 5) until multimeter indicates 10.000

V dc.

(12)Enter -5 VOLT using DATA keys.

(13)Multimeter will indicate between -9.985 and -10.015 V dc.

21.Final Procedure

a. Deenergize and disconnect all equipment.

b. Annotate and affix DA label/form in accordance with TB 750-25.

22

Image 22

Contents Models 3325A and 3325B Section Identification and Description Forms, Records, and ReportsProgrammed amplitude at 1 kHz Section Equipment Requirements Spectrum Analyzer Section Calibration Process Equipment SetupPreliminary Instructions IN/OUT Harmonic Distortion a. Performance CheckEntry Amptd 20 dBm Entry DC Offset Volt Entry Freq 20 MHz Signal on Entry Freq 25 kHz Entry Amptd Volt 50 Hz Entry Amptd VoltAmplitude Modulation Distortion a. Performance Check Square Wave Characteristics Performance CheckEntry Freq MHz Entry Amptd Volt Entry DC Offset Ramp Retrace Performance Check Entry Freq MHz Entry Amptd RMSEntry Freq 10 kHz Entry Amptd Volt Entry Freq 20 MHz Entry Amptd Volt Frequency Accuracy Performance CheckEntry Freq 60 MHz Adjustments SIG InputBlue then Asgn Zero Phase Entry PhaseEntry Freq 100 kHz Entry Amptd 13 dBm Entry DC Offset Volt Sine wave Amplitude and Flatness Performance CheckEntry Amptd RMS Entry Freq 100 Hz Amptd CAL Entry DC Offset Entry Freq KHz Entry Amptd RMS Amptd CAL Press Entry Amptd keySquare Wave Amplitude and Flatness Performance Check KHz Entry Amptd RMS Amptd CAL Triangle and Ramp Amplitude Performance Check100 Hz Amptd CAL Dc Offset Performance CheckDc Offset with Ac Performance Check High Voltage Output Option 002 only Performance Check Entry Freq 100 kHz Entry Amptd RMS Amptd CAL Power SupplyEntry Freq KHz Entry Amptd RMS Amptd CAL Final Procedure Power supply assembly A2 test instrument top viewPIN