Keysight Technologies 3458A Guide D'utilisation page 189

Measuring temperature
The temperature-related math operations convert the measured resistance of a
thermistor or RTD into a Fahrenheit or Celsius temperature reading.
describes each of the temperature-related math operations. The resistance
measurement can be made in either 2-wire ohms (OHM command) or 4-wire
ohms (OHMF command). For the greatest accuracy, use the 4-wire ohms mode.
Conditions that affect the accuracy of a typical resistance measurement also
affect the accuracy of temperature measurements (see
in
Table 4-6
MATH operation
CTHRM2K
CTHRM
CTHRM10K
FTHRM2K
FTHRM
FTHRM10K
CRTD85
CRTD92
FRTD85
FRTD92
The following example performs a temperature measurement using a 10 kW
thermistor and returns the result in degrees Celsius.
10 OUTPUT 722;"PRESET NORM"!PRESETS MULTIMETER, SUSPENDS READINGS
20 OUTPUT 722;"OHMF 10E3"!SELECTS 4-WIRE OHMS, 10 kW RANGE
30 OUTPUT 722;"MATH CTHRM10K"!CELSIUS CONVERSION, 10 kW THERMISTOR
40 OUTPUT 722;"TRIG SGL"!TRIGGER READING
50 ENTER 722;A!ENTER RESULT
Keysight 3458A User's Guide
Chapter 3).
Temperature-related math operations
Description
Result = temperature (Celsius) of a 2 kW thermistor (40653A)
Result = temperature (Celsius) of a 5 kW thermistor (40653B)
Result = temperature (Celsius) of a 10 kW thermistor (40653C)
Result = temperature (Fahrenheit) of a 2 kW thermistor (40653A)
Result = temperature (Fahrenheit) of a 5 kW thermistor (40653B)
Result = temperature (Fahrenheit) of a 10 kW thermistor (40653C)
Result = temperature (Celsius) of 100 W RTD with alpha of 0.00385 (40654A or
406548)
Result = temperature (Celsius) of 100 W RTD with alpha of 0.003916
Result = temperature (Fahrenheit) of 100 W RTD with alpha of 0.00385 (40654A or
40654B)
Result = temperature (Fahrenheit> of 100 W RTD with alpha of 0.003916
Making Measurements
Table 4-6
Resistance and Calibration
4
189