2: General operation Model DMM7510 7½ Digit Graphical Sampling Multimeter Reference
2-112 DMM7510-901-01 Rev. B / May 2015
Enabling or disabling dry circuit ohms
Dry circuit ohms is only available for the 4-wire resistance function.
When the dry circuit ohms feature is enabled, DRYCR is displayed to the right of the measurement on
the front panel of the instrument.
With 4-wire measurement 1 to 100 kΩ ranges and dry circuit 1 to 10 kΩ ranges, thermal voltages in
the test leads or device under test can create measure errors. To eliminate the thermal offset, offset
compensation is automatically enabled when you enable dry circuit ohms.
When offset compensation is enabled, two measurement phases are made. The first is with the I
off
test current, which is sourced from HI and LO and measured across the Sense HI and Sense LO
terminals. The second measurement is measured across Sense HI and Sense LO with an I
on
test
current from HI and LO. The difference between the I
on
and I
off
measurements is applied as an offset
to eliminate any thermal voltages.
When the dry circuit ohms attribute is enabled, the offset-compensated ohms attribute is
automatically enabled (OCMP displayed to the right of the measurement). If you do not wish to use
offset-compensated ohms, after setting dry circuit ohms, disable offset-compensated ohms.
From the front panel:
1. Press the FUNCTION key.
2. Select 4W Res.
3. Press the MENU key.
4. Under Measure, select Settings.
5. Swipe to scroll down.
6. Set Dry Circuit to ON to enable or OFF to disable.
7. Press the HOME key to return to the measurement display.
Using SCPI commands:
Send the commands:
:SENSe:FUNCtion "FRES"
:SENSe:FRES:DCIRcuit ON
Using TSP commands:
Send the commands:
dmm.measure.func = dmm.FUNC_4W_RESISTANCE
dmm.measure.drycircuit = dmm.ON
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