High Voltage SourceMeter Instrument Reference Manual Section 4:
2470-901-01 Rev. A / May 2019 4-31
Offset-compensated ohms
The voltage offsets caused by the presence of thermoelectric EMFs (V
EMF
) can adversely affect
resistance measurement accuracy. To overcome these offset voltages, you can use
offset-compensated ohms.
See Offset-compensated ohm calculations (on page 5-23
) for additional detail on calculating
offset-compensated ohms.
Setting offset-compensated ohms
Using the front panel:
This setting is only available from the front panel when the resistance measurement function is
selected.
1. Press the MENU key.
2. Under Measure, select Settings.
3. Set Offset Compensation to On.
4. Select HOME to return to the operating display.
Using SCPI commands:
To enable offset-compensated ohms, send the command:
SENSe:RESistance:OCOMpensated ON
Using TSP commands:
To enable offset-compensated ohms, send the commands:
smu.measure.func = smu.FUNC_RESISTANCE
smu.measure.offsetcompensation = smu.ON
Source and measure using SCPI commands
The SCPI commands that set up the source functions are in the SOURce subsystem.
The source commands are specific to each source function (voltage or current). For example, to set
the range to 100 mA for the current function, you would send:
:SOURce:FUNCtion CURRent
:SOURce:CURRent:RANGe 1e-01
To set the range to 20 V for the voltage function, you would send:
:SOURce:FUNCtion VOLTage
:SOURce:VOLTage:RANGe 20
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