Racal Instruments 3162A/B, User Manual

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User Manual 3162A/B
Maintenance and Performance Checks 5-21
Offset Adjustment
Equipment: DMM, 50
Ω
feedthrough termination
1. Configure the Model 3162B as follows:
Function: Sine
Frequency: 1 MHz
Amplitude:
10 mV
Offset: +4.500 V
Remote Commands: :RES
:FREQ 1e6
:VOLT 10e-3
:VOLT:OFFS 4.5
:OUTP ON
Channel A Adjustment
2. Connect the Model 3162B output to the DMM input through the 50
Ω
feedthrough termination. Set the DMM to DCV measurements and 10 V
range. Record this reading.
3. Change the offset setting to -4.50 V and adjust R95 on the main board
to have the exact reading as was recorded in the previous step (with
reversed polarity).
4. Adjust R96 on the main board for a DMM reading of -4.500 V, ±30
mV.
5. Repeat Steps 3 and 4 until the best result is obtained in both steps.
Channel B Adjustment
6. Change the Model 3162B settings using the following remote
commands:
:INST:SEL B
:VOLT 10e-3
:VOLT:OFFS 4.5
:OUTP ON
7. Connect the Model 3162B output to the DMM input through the 50
Ω
feedthrough termination. Set the DMM to DCV measurements and 10 V
range. Record this reading.
8. Change the offset setting to -4.50 V and adjust R77 on the B channel
engine board to have the exact reading as was recorded in the previous
step (with reversed polarity).
9. Adjust engine board B R76 until the DMM reading is -4.500 V, ±30 mV.
10. Repeat steps 3 and 4 until the best result is obtained in both steps.