HP 83522A Service Notes page 61

Adjustments Model 83522A
ADJUSTMENTS
5-1 6. YO DRIVER BOARD A6 DAC CALIBRATION
REFERENCE:
Performance Test: 8350A Paragraph 4-13.
Service Sheet: A6
DESCRIPTION:
Adjustments are made to remove offsets and calibrate OFFSET and SLOPE DAC step sizes.
EQUIPMENT:
Sweep Oscillator
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HP 8350A
Digital Voltmeter (DVM)
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HP 3455A
PROCEDURE:
NOTE
YO Driver Board adjustments should be avoided if possible. Set up
equipment as shown in Figure 5-8 and perform step 23 in Paragraph 5-1 7
to check frequency accuracy and sweep linearity across the band. If
frequencies are within
+5 MHz
tolerance, do not make these YO Driver
Board adjustments.
1. Connect the equipment as shown in Figure 5-5 with the DVM connected to A6P1 pin 4
(FREQ CAL) and common connected to A6TP5 (GND ANLG).
SWEEP R F
OSCILLATOR PLUG-IN
DIGITAL VOLTMETER
Figure 5-5. YO Driver Board Adjustment Test Setup
2. Press INSTR PRESET
.
3. Adjust the 83522A front panel
: knob for a DVM reading of 0.000
+_
0.010
Vdc. This sets the FREQ CAL control to the electrical center of its range.
4. Float ground on DVM and connect floating ground to A6TP13 (+20 V FREQ. REF.).
Connect measurement lead of DVM to A6TP16. (See Figure 5-5 and 5-6.)