Enable or disable dry circuit ohms through the remote interface
To enable dry circuit ohms through the remote interface, send the commands:
dmm.func = "fourwireohms"
dmm.drycircuit = dmm.ON
To disable dry circuit ohms through the remote interface, send the command:
dmm.drycircuit = dmm.OFF
Performing dry circuit ohms measurements
Make sure you use four-wire connections to the DUT as detailed in Analog backplane connector (rear
panel) (on page 4-18) or specific to the module used for switching.
To perform dry circuit ohms measurements:
Do not make connections to the device under test (DUT) until after the dry circuit ohms attribute is
enabled in step 2.
1. Press the OPENALL key to open all switching channels.
2. If not already on, enable dry circuit ohms (see Enable or disable dry circuit ohms from the front
panel (on page 4-65)).
â–ª Dry circuit ohms enabled: DRY+
â–ª Dry circuit ohms disabled: DRY-
When dry circuit measurement is enabled (DRY+), offset-compensated ohms will also enable (OC+
annunciator turns on). If you do not wish to use offset-compensated ohms, disable it (see Enable or
disable offset-compensated ohms (on page 4-67)).
3. Make 4-wire connections to the DUT. See 4-wire connection information contained in analog
backplane connector (rear panel) (on page 4-18) and Switching module connections (on page 4-
20).
4. Use the RANGE ▲ and ▼ keys to select the 1 Ω, 10 Ω, 100 Ω, 1 kΩ, or 10 kΩ range, or press
the AUTO key to enable autorange.
5. If using a switching module, perform the following steps to close the channel:
a. Use the navigation wheel to dial in the channel number.
b. Press the CLOSE key.
6. Press the TRIG key and observe the displayed reading. If the "Overflow" message is displayed,
select a higher range until a normal reading is displayed (or press the AUTO key for autoranging).
For manual ranging, use the lowest possible range for the best resolution.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press the OPENALL key to open all channels.
The on or off states of dry circuit ohms and offset-compensated ohms are saved with four-wire ohm
function. If you select a different measurement function, then select four-wire ohms again, the
previous attribute states of dry circuit ohms and offset-compensated ohms will be restored.
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