The Series 3700A is in 4-wire ohm mode when 4W is displayed. Offset compensation is active
when the OC+ is displayed (OC- is shown in the above figure).
1. Set the Series 3700A for the 4-wire ohm measurement function.
2. Press the CONFIG key .
3. Press the DMM key .
4. Turn the navigation wheel to scroll to the "OFFSETCOMP" menu item. Press the navigation
wheel to select.
5. Turn the navigation wheel to select the ON/OFF settings for Offset Compensation as needed and
press the navigation wheel to set.
6. Press the EXIT key to leave the menu.
Figure 71: Four-wire Ohm ATTR MENU: OFFSETCOMP
Performing offset-compensated ohms measurements
Make sure you use 4-wire connections to the DUT as detailed in analog backplane connector (rear
panel) (on page 4-18). If you are using a module for switching, make the connections specific to the
module.
To make offset-compensated ohms measurements:
1. Press the OPENALL key to open all switching channels.
2. If not already on, enable offset compensated ohms (OC+ annunciator is lit). See
Enabling/disabling offset-compensated ohms (on page 4-67).
3. Use the RANGE ▲ and ▼ keys to select the range, or press the AUTO key to enable autorange.
If using autorange, offset-compensated ohms measurements will not be performed if the
instrument goes to the 100 kΩ (or higher) range.
4. Perform steps 4 through 8 of the Resistance measurements from the front panel (on page 4-21)
procedure.
Offset compensation can be enabled for any 4-wire range. The internal DMM will perform offset
compensation for the ≤10 kΩ ranges and automatically disable for ≥100 kΩ ranges. Send the
following remote commands and the Series 3700A returns the reading and a "1" or a logic "True", but
the DMM only performed a standard 4-wire measurement.
dmm.func="fourwireohms"
dmm.range=100e3
dmm.offsetcompensation=1
print(dmm.measure())
print(dmm.offsetcompensation)
With dry circuit ohms enabled, the 10 kΩ range (measuring a maximum resistance of 2.4 kΩis the
highest offset-compensated ohms range that can be selected.
For buffer recall, there is no way to distinguish between a normal ohms reading and an offset-
compensated ohms reading. The OC annunciator (– or +) has no significance for recalled resistance
readings that are displayed.
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