7½ Digit Graphical Sampling Multimeter Reference Manual Section 8:
DMM7510-901-01 Rev. B / May 2015 8-173
dmm.measure.offsetcompensation.enable
This attribute enables or disables offset compensation.
Type TSP-Link accessible Affected by Where saved Default value
Attribute (RW) Yes
Restore configuration
Instrument reset
Power cycle
Measure configuration list
Configuration script
Measure configuration list
4-wire resistance: dmm.OFF
Temperature, 3- or 4-wire RTD:
dmm.ON
Usage
state = dmm.measure.offsetcompensation.enable
dmm.measure.offsetcompensation.enable = state
Disable offset compensation:
Enable offset compensation: dmm.ON (for 4-wire resistance, not available for ranges
Ω)
Functions
dmm.FUNC_DIGITIZE_CURRENT
dmm.FUNC_DIGITIZE_VOLTAGE
Details
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.
For 4-wire resistance measurements, when offset compensation is enabled, the measure range is
limited to a maximum of 100 kΩ. Offset compensation is automatically enabled when dry circuit is
enabled.
For 2-wire resistance measurements, offset compensation is always set to off.
For temperature measurements, offset compensation is only available when the transducer type is
set to 3-wire or 4-wire RTD.
Example
dmm.measure.func = dmm.FUNC_TEMPERATURE
dmm.measure.transducer = dmm.TRANS_FOURRTD
dmm.measure.offsetcompensation.enable = dmm.ON
print(dmm.measure.read())
Sets the measurement function to
resistance. Set the instrument for 4-wire
RTD and turn offset compensation on.
Make a measurement.
Also see
dmm.measure.drycircuit (on page 8-149)
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