User manual

Series 3700 System Switch/Multimeter Reference Manual Section 13: Instrument Control Library (ICL)
3700S-901-01 Rev. C / July 2008 13-165
dmm.rtddelta
Remarks
This attribute is only valid when dmm.func = "temperature". All other
configurations generate an error and return nil when queried. Also, get errors if
parameter value out of range. The valid range for user delta is 0 to 5. For temperature,
this setting is used when the transducer type is set to 3 or 4-wire RTD. For other
transducer types, the setting will be set, but ignored until the transducer type is for an
RTD one.
NOTE The following attributes share common settings and apply to both 3 and 4-
wire RTDs: dmm.rtdalpha (on page 13-162), dmm.rtdbeta (on page 13-
163), dmm.rtddelta, and dmm.rtdzero (on page 13-165). 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 desired, they
must be changed, or use two different DMM configurations.
Changing functions with dmm.func (on page 13-137) will reflect the RTD delta setting
for that function.
The factory default and dmm.reset() (on page 13-161) function value is 1.507.
Also see
dmm.rtdalpha (on page 13-162)
dmm.rtdbeta (on page 13-163)
dmm.rtdzero (on page 13-165)
Example
To set user delta constant for RTD to 3:
dmm.func = "temperature"
dmm.transducer = dmm.TEMP_THREERTD or dmm.TEMP_FOURRTD
dmm.rtddelta = 3
dmm.rtdzero
Attribute
Indicates the user type RTD zero value.
Usage
To read the user type RTD zero value:
value = dmm.rtdzero
value: Represents the present user type RTD zero value.
To write the user type RTD zero value:
dmm.rtdzero = value
value: Represents the desired user type RTD zero value.