Verifying Dry Circuit Resistance - Keithley 2750 Service Manual

1-28 Performance Verification
Table 1-14
Limits for plug-in module normal resistance verification
 Range
10
100
10k
100k
10M
100M
* Enable OCOMP for 1, 10, and 100 ranges.
** Calculate limits based on actual calibration resistance values and Model 2750 one-year resistance accuracy
specifications. See

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
Follow these steps to verify dry circuit resistance accuracy:
1.
NOTE
Nominal
resistance
1 1 0.999820 to 1.000180
10
100
1k 1k 0.999894 to 1.000106k
10k
100k
1M 1M 0.999890 to 1.000110M
10M
100M
"Verification
Do not apply more than 300V between the 7700 plug-in module INPUT or
SENSE H and L terminal, or between any adjacent channels, or instrument
damage could occur.
Using shielded Teflon or equivalent cables in a 4-wire configuration, connect the
Model 7700 CH1 H and L INPUT terminals, and CH11 H and L SENSE terminals
to the calibrator as shown in
The 1k¾ range can tolerate 80% of range (0.8¾) lead resistance. Ensure that
relay and cable connections have ð0.8¾ of resistance before verifying the 1¾
range.
Model 2750 Multimeter/Switch System Service Manual
Nominal reading limits
(1 year, 18°C to 28°C)
9.99880 to 10.00120
99.9880 to 100.0120
9.99894 to 10.00106k
99.9890 to 100.0110k
9.99590 to 10.00410M
99.5770 to 100.4230M
limits."
Figure 1-15.
Recalculated limits**
__________ to __________ 
__________ to __________ 
__________ to __________ 
__________ to __________ k
__________ to __________ k
__________ to __________ k
__________ to __________ M
__________ to __________ M
__________ to __________ M