User manual

Section 14: Verification Series 3700 System Switch/Multimeter Reference Manual
14-22 3700S-901-01 Rev. C / July 2008
Description
Range (Ohms)
Test point
(Ohms)
Lower limit (Ohms)
Upper limit
(Ohms)
Verify 2W Res 100k Ohm
1.00E+05
1.00E+05
9.999360E+04
1.000064E+05
Verify 2W Res 1M Ohm
1.00E+06
1.00E+06
9.999360E+05
1.000064E+06
Verify 2W Res 10M Ohm
1.00E+07
1.00E+07
9.995900E+06
1.000410E+07
Verify 2W Res 100M
Ohm
1.00E+08
1.00E+08
9.979700E+07
1.002030E+08
Verifying dry circuit resistance
Check the dry circuit resistance function by connecting accurate resistance
values to the Series 3700 analog backplane connector and verifying that the
displayed readings fall within specified limits.
CAUTION Do not exceed 300V peak between INPUT HI and INPUT LO
because instrument damage may occur.
To verify dry circuit resistance accuracy:
1. Using shielded, Teflon-insulated or equivalent cables in a 4-wire
configuration, connect the Series 3700 INPUT and SENSE pins to the
calibrator as shown for 100 to 10M ranges.
2. Set the calibrator for 4-wire resistance with external sense on.
3. Select the Series 3700 4-wire resistance function.
4. Select the SLOW integration rate with the RATE key.
5. Enable dry circuit resistance function (see Enabling/disabling dry circuit
ohms in the User's manual).
6. Set the Series 3700 for the 100 range, and make sure the FILTER is on.
Enable OC+ (offset-compensated ohms). Use OC+ for 100 and 1kOhm
range verification. See Enabling/disabling offset-compensated ohms in the
User's manual.
7. Recalculate reading limits based on actual calibrator resistance values.
8. Source the nominal full-scale resistance values for the 100 to 2k ranges
summarized in the Dry circuit resistance verification data (on page 14-23)
table. Verify that the readings are within calculated limits.