Verifying Zeroes Using A Four-Wire Short - Keithley 3700 series Reference Manual

Series 3700 System Switch/Multimeter Reference Manual

Verifying zeroes using a four-wire short

Check the zeroes of various testpoints while the four-wire is connected to the Series 3700
analog backplane connector and verify that the displayed readings fall within specified limits.
CAUTION
To verify DC voltage and resistance zeroes:
1. Select the DC volts function.
2. Set the Series 3700 to the 100mV range.
3. Connect the four-wire short to the Series 3700 analog backplane connector and allow to
settle for 5 minutes. (Do Not Use REL.)
4. Verify the 100mV zero is within specification (see the 4-wire short applied resistance
verification table).
5. Set the Series 3700 to the 1V range.
6. Allow to settle for 5 minutes (do not use REL).
7. Verify the 1V zero is within specification (see the 4-wire short applied resistance verification
table).
Follow these steps to verify resistance using the 4-wire short:
1. With the four-wire short still applied, select the Series 3700 4-wire resistance function.
2. Select the SLOW integration rate with the RATE key.
3. Set the Series 3700 for the 1 range, and make sure the FILTER is on. Enable OC+ (offset-
compensated ohms). (Use OC+ for 1 and 10range verification.)
4. Verify the 1 range zero is within specification (see the 4-wire short applied resistance
verification table).
5. Set the Series 3700 for the 10 range (make sure the FILTER is on and OC+ is still
enabled).
Document Number: 3700S-901-01 Rev. A / August 2007
Do not exceed 300V peak between INPUT HI and INPUT LO because
instrument damage may occur.
Section 10: Verification
10-21