Quick Results Guide 13
Measure ohms
Measurement methods
There are two methods to measure resistance; auto ohms and manual ohms. In auto ohms,
the SourceMeter operates as a conventional constant-current source ohmmeter. You simply
select an ohms measurement range (or auto range) and take the reading from the display.
In manual ohms, the SourceMeter uses the V/I measurement method. After configuring the
source (V or I) and selecting a voltage or current measurement range, the Ω measurement func-
tion will display the calculated V/I ohms reading.
Use the following menu sequence to select the auto ohms or manual ohms measurement
method:
Press CONFIG > press MEAS Ω > select SOURCE > select AUTO or MANUAL
Ohms source readback
With source readback enabled, the SourceMeter measures both V and I and uses these values
for the ohms calculation. This feature provides optimum accuracy for front panel operation
since the measured source value is more accurate than the programmed source value. For
remote operation, the user specifies the functions to measure.
Use the following menu sequence to enable or disable source readback:
Press CONFIG > press MEAS Ω > select SRC RDBK > select ENABLE or DISABLE
Ohms measurement procedures
The auto ohms and manual ohms measurement procedures are provided in Tables 4 and 5.
They assume that the DUT is already connected to the SourceMeter. (See Basic connections.)
Note that resistance accuracy specifications are based on 4-wire sensing.
Table 4
Auto ohms measurement procedure
Procedure Details
1. Select ohms measurement
function.
Press MEAS Ω.
2. Select auto ohms measurement
method.
Press CONFIG > press MEAS Ω > select SOURCE
> select AUTO.
3. Select measurement range. Use RANGE and keys to manually select range.
Or press AUTO RANGE (AUTO annunciator on) to
enable auto range.
4. Turn output on and take readings
from display.
Press ON/OFF OUTPUT key. Red OUTPUT indica-
tor on.
5. Turn output off when finished. Press ON/OFF OUTPUT key. Red OUTPUT indica-
tor off.
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