8: TSP command reference Model DMM7510 7½ Digit Graphical Sampling Multimeter
8-174 DMM7510-901-01 Rev. B / May 2015
dmm.measure.opendetector
This attribute determines if the detection of open leads is enabled or disabled.
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
4W Res: dmm.OFF
Temperature: dmm.ON
Usage
state = dmm.measure.opendetector
dmm.measure.opendetector = state
Disable open lead detector:
Enable open lead detector:
Functions
dmm.FUNC_DIGITIZE_CURRENT
dmm.FUNC_DIGITIZE_VOLTAGE
Details
For temperature measurements, this is only available when the transducer is set to a thermocouple or
one of the RTDs.
Long lengths of thermocouple wire can have a large amount of capacitance, which is seen at the
input of the DMM. If an intermittent open occurs in the thermocouple circuit, the capacitance can
cause an erroneous on-scale reading. The open thermocouple detection circuit, when enabled,
applies a 100 µA pulse of current to the thermocouple before the start of each temperature
measurement.
Example
dmm.measure.func = dmm.FUNC_TEMPERATURE
dmm.measure.transducer = dmm.TRANS_THERMOCOUPLE
dmm.measure.opendetector = dmm.OFF
Set the measure function to temperature.
Set the transducer type to thermocouple.
Set open lead detection off.
Also see
dmm.measure.transducer (on page 8-197)
Open lead detection (on page 2-106)
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