1-16 Performance Verification Model 2750 Multimeter/Switch System Service Manual
Verifying dry circuit resistance
Check the dry circuit resistance function by connecting accurate resistance values to the
Model 2750 and verifying that its resistance readings are within the specified limits.
CAUTION Do not apply more than 1000V peak between front terminals INPUT HI
and LO or more than 350V peak between SENSE HI and LO, or instru-
ment damage could occur.
Follow these steps to verify dry circuit resistance accuracy:
1. Using shielded, Teflon-insulated or equivalent cables in a 4-wire configuration,
connect the Model 2750 INPUT and SENSE jacks to the calibrator as shown in
Figure 1-7. Be sure the INPUTS switch is in the FRONT position.
Tab le 1- 6
Limits for normal resistance verification
Range
Nominal
Resistance
Nominal Reading Limits
(1 year, 18°C to 28°C) Recalculated Limits**
1
10
100
1k
10k
100k
1M
10M
100M
1
10
100
1k
10k
100k
1M
10M
100M
0.999820 to 1.000180
9.99880 to 10.00120
99.9880 to 100.0120
0.999894 to 1.000106k
9.99894 to 10.00106k
99.9890 to 100.0110k
0.999890 to 1.000110M
9.99590 to 10.00410M
99.7970 to 100.2030M
__________ to __________
__________ to __________
__________ to __________
__________ to __________ k
__________ to __________ k
__________ to __________ k
__________ to __________ M
__________ to __________ M
__________ to __________ M
* Enable OCOMP (offset-compensated ohms) when testing 1, 10, and 100 ranges.
** Calculate limits based on actual calibration resistance values and Model 2750 one-year resistance accuracy
specifications. See “Verification limits.”
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