Verifying zeros using a 4-wire short
Check the zeros of various test points while the 4-wire is connected to the Series 3700A analog
backplane connector and verify that the displayed readings fall within specified limits.
Do not exceed 300 V
PEAK
between INPUT HI and INPUT LO because instrument damage may
occur.
To verify DC voltage and resistance zeros:
1. Select the DC volts function.
2. Set the Series 3700A to the 100 mV range.
3. Connect the 4-wire short to the Series 3700A analog backplane connector and allow to settle for
5 minutes (do not use relative offset).
4. Verify the 100 mV zero is within specification (see the 4-wire short applied verification data (on
page B-20) table).
5. Set the Series 3700A to the 1 V range.
6. Allow to settle for 30 seconds (do not use relative offset).
7. Verify the 1 V zero is within specification (see the 4-wire short applied verification data (on page
B-20) table).
To verify resistance using the 4-wire short:
1. With the 4-wire short still applied, select the Series 3700A 4-wire resistance function.
2. Select the SLOW integration rate with the RATE key.
3. Set the Series 3700A for the 1 Ω range, and make sure the FILTER is on. Enable OC+ (offset-
compensated ohms). Use OC+ for 1 Ω and 10 Ω range verification.
4. Verify the 1 Ω range zero is within specification (see the 4-wire short applied verification data (on
page B-20) table).
5. Set the Series 3700A for the 10 Ω range (make sure the FILTER is on and OC+ is still enabled).
6. Verify the 10 Ω range zero is within specification (see the 4-wire short applied verification data (on
page B-20) table).
Figure 170: 4-wire short diagram
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