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SECTION 3
Seruice Infomation
3.3.7
Calibration Procedures
NOTE
Calibration should be performed in the se-
quence presented.
DC Offset
1.
and i5.002V. If not, repeat th:DC span adjustment
Connect the Model 197A DMM to the Model 3930A
FCTN OTJT jack, as shown in Figure 3-4.
2. Set the Model 197A to the DCV function, and enable
auto-ranging.
3. Setup the Model 3930A as follows:
Factory Default (press SHIFT PRSTI
SOURCE: EXTk
MODE: GATE
RANGE: FXD (press SHIFT 0)
FCTN: DC
4. Adjust R213 (DC OFS) so that the DMM reads OV f
1mV.
5. Program a Model 3930A DC offset value of -15V (use
OFFSET).
6. Adjust R211 (DC SPAN) for a DMM reading of -15V
f 0.002v.
7. Program a DC offset voltage of +15V.
8. Verifv that the DMM reading is between 14.996V
(step 6) to mini&e
the errors in the -15V and +15V
readings.
9. Program a DC offset voltage of OV, and verify that
the DMM reading is still OV f 1mV. If not, m-adjust
R213 (DC OFS) for a reading within these limits.
10. Setup the Model 3930A as follows:
FCTNz SIN
OFFSET: ov
AMMD
3ovp-p
11. Adjust RlOl (OFS) for a DMM reading of OV f 1mV.
SIN Level
1. Connect the Model 197A DMM to the FCTN OUT
jack of the Model 3930A (Figure 3-4).
0.064v.
2. Set the Model 197A to the DCV function, and select
auto-range.
3. Setup the Model 3930A as follows:
Factory Default (press SHIFT PRST)
SOTJRCE: EXT'iL
MODE: GATE
PHASE: -90"
AMPTD 7.49vp-p
4. Adjust R109 (AMP) for a DMhJ reading of -3.745Vf
Model 393049
Model 197A DMM
na 1458
Banana
Fipre 3-4.
Connections to Model 197A DMM
3-6
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