7Measurement Tutorial
288 Keysight 34420A User’s Guide
Temperature Measurements
A temperature measurement is either a resistance measurement or a voltage
measurement, converted to a temperature mathematically inside the meter. The
mathematical conversions requires the knowledge of specific properties of specific
transducer types. The conversion routines used are compatible with ITS-90. The
conversion accuracy (not including the transducer accuracy) for each transducer
type is:
RTD 0.05 °C
Thermistor 0.1 °C
Thermocouple 0.2 °C
Errors associated with temperature measurements include all those listed for dc
Voltage and Resistance Measurements. The largest source of error in temperature
measurements is the transducer itself.
Your measurement requirements determine which temperature transducer type to
use. Each transducer type has a particular temperature range, accuracy, and cost.
Each type of transducer is described in more detail in the following subsections.
The table below summarizes some general specifications for each type of
transducer. Use the table to help select the general type of transducer to use;
transducer manufacturers can provide you with exact specifications for a
particular transducer.
RTD Thermistor Thermocouple
Temperature Range -200 to 850 °C -80 to 150 °C -210 to 1820 °C
Measurement Type 4-wire Resistance 2-wire Resistance Voltage
Transducer
Sensitivity
_R
0
X 0.004 °C
_400 W /°C 6 to 60 mV/°C
Accuracy 0.01 to 0.1 °C 0.1 to 1 °C 0.5 to 5 °C
Cost (approx)
$20.00 to $100.00 ea
[a]
[a] Estimated cost in U.S. Dollars
$10.00 to $100.00 ea
[a]
$1.00/foot
[a]
Durability Fragile Fragile Rugged
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