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Model 2790 SourceMeter
Performing offset-compensated ohms measurements
Offset-compensated ohms can only be performed on the Ω4 function using the 100Ω, 1kΩ,
or 10kΩ range. Make sure you use 4-wire connections to the DUT (see
page
klqb
1.
2.
3.
4.
klqb
®
Switch System Reference Manual
3-8).
Make sure the INPUTS switch is in the correct position. To use front panel
inputs, it must be in the "F" (out) position. For switching modules, it must be in
the "R" (in) position.
If a switching channel is presently closed (displayed), press OPEN to open it.
Select the 4-wire ohms measurement function by pressing Ω4 and enable offset
compensated ohms by pressing SHIFT and then OCOMP (OCOMP annunciator
turns on).
Use the RANGE
and
press AUTO to enable autorange. If using autorange, offset compensated ohms
measurements will not be performed if the instrument goes to the 100kΩ or higher
range.
Perform steps 4 through 8 of the
procedure.
The OCOMP annunciator will flash when the instrument is on an invalid range
(100kΩ through 100MΩ ranges) for offset-compensated ohms. Normal ohms
measurements will instead be performed.
For buffer recall, there is no way to distinguish between a normal ohms reading
and an offset-compensated ohms reading. The OCOMP annunciator (off, on, or
flashing) has no significance for recalled resistance readings that are displayed.
Buffer operation is covered in
With offset-compensated ohms enabled, it will be "remembered" by the Ω4
function after you change measurement functions (i.e., DCV). When Ω4 is again
selected, offset-compensated ohms will be enabled.
keys to select the 100Ω, 1kΩ, or 10kΩ range, or
"Standard resistance measurements," page
Section
6.
3-21
"Connections,"
3-19,
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