Keithley 3720-ST User Manual

Series 3700A System Switch/Multimeter Reference Manual Section 11: TSP command reference
3700AS-901-01 Rev. D/June 2018 11-223
This setting only applies when the transducer type is set to 3 or 4-wire RTD. For other transducer
types, the setting is set but not used until the transducer type is set to an RTD type.
The RTD delta setting is saved with the function setting, so if you use another function, then return to
the temperature function, the RTD delta setting you set previously is retained.
The following attributes share common settings and apply to both 3 and 4-wire RTDs:
dmm.rtdalpha, dmm.rtdbeta, dmm.rtddelta, and dmm.rtdzero. Therefore, when both 3 and
4-wire RTDs are set to USER type for RTD, switching transducers between 3 and 4 will cause both
to use the same settings (for example, dmm.rtdalpha, dmm.rtdbeta). If unique settings are
needed, they must be changed, or use two different DMM configurations.
An error is generated if the value is out of range.
Example 1
dmm.func = "temperature"
dmm.transducer = dmm.TEMP_THREERTD
dmm.rtddelta = 3
dmm.transducer = dmm.TEMP_FOURRTD
dmm.rtddelta = 5
dmm.transducer = dmm.TEMP_THREERTD
print(dmm.rtddelta)
Set a delta constant for RTD to 3 for 3-wire RTD.
Change to 4-wire RTD.
Change the delta constant to 5.
Switch back to 3-wire RTD. The value is 5.
Output:
5.000000000e+00
Example 2
dmm.func = "temperature"
dmm.transducer = dmm.TEMP_THREERTD
dmm.rtddelta = 3
dmm.configure.set("RTD_3wire")
dmm.transducer = dmm.TEMP_FOURRTD
dmm.rtddelta = 5
dmm.configure.set("RTD_4wire")
dmm.configure.recall("RTD_3wire")
print(dmm.transducer, dmm.rtddelta)
dmm.configure.recall("RTD_4wire")
print(dmm.transducer, dmm.rtddelta)
This example sets unique delta constants for 3-
wire and 4-wire RTDs by creating two DMM
configurations.
Output:
3.000000000e+00 3.000000000e+00
4.000000000e+00 5.000000000e+00
Also see
dmm.configure.recall() (on page 11-165)
dmm.configure.set() (on page 11-166)
dmm.func (on page 11-179)
dmm.rtdalpha (on page 11-220)
dmm.rtdbeta (on page 11-221)
dmm.rtdzero (on page 11-224)

Keithley 3720-ST Specifications

General

Brand	Keithley
Model	3720-ST
Category	Multimeter
Language	English