2400 Series SourceMeter
®
User’s Manual Ohms Measurements 4-3
Ohms measurement methods
NOTE For the Model 2430, the following ohms measurement procedures assume that
the DC Mode of operation is selected (“Vsrc” or “Isrc” displayed in the source
field). If in the Pulse Mode (“Vpls” or “Ipls” displayed), you can select the DC
Mode by pressing CONFIG V or I, selecting the SHAPE menu item, and then
selecting DC. Pulse Mode operation is covered in Section 5.
There are two methods to measure ohms: auto ohms and manual ohms. When using auto
ohms, the SourceMeter operates as a conventional constant-current source ohmmeter or
DMM. To use this method, simply select an ohms measurement range (or use autorange),
and take the reading from the display. When using auto ohms, the default test current var-
ies with the ohms range, as summarized in Table 4-1.
NOTE You cannot change the test current in the auto ohms mode. If you attempt to
change the source current in auto ohms, the SourceMeter will display an error
message.
With the manual ohms mode, you can select either source V or source I to make ohms
measurements, and the unit will automatically compute the resistance reading using the
V/I measurement method. After configuring the desired source and selecting a voltage or
current measuring range, select the Ω measurement method to display the calculated V/I
ohms reading.
NOTE To achieve optimum accuracy, the SourceMeter measures both V and I and uses
these values in ohms calculations (with source readback enabled). The mea-
sured source value is more accurate than the programmed source value. For
remote operation, the user specifies the functions to measure. See the resistance
measurement accuracy specifications in Appendix A for more information.
Table 4-1
Auto ohms default test currents
Auto ohms
range
2400 and 2410
default test current
2420, 2425, 2430, and 2440
default test current
2Ω
20Ω
200Ω
2kΩ
20kΩ
200kΩ
2MΩ
20MΩ
200MΩ
-
100mA
10mA
1mA
100µA
10µA
1µA
1µA
100nA
1A
100mA
10mA
1mA
100µA
10µA
10µA
1µA
-
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