Temperature measurements via thermocouple sensors rely on cold junction
NOTE
compensation which reflects the ambient temperature. This ambient
temperature is most important to ensure the accuracy of the thermocouple
measurement. The multimeter must be placed in a stable operating environment
for at least 1 hour to obtain a stable reference of the ambient temperature. The
ambient temperature is shown on the secondary display for most
measurements, which helps you to record the measurement reading and the
ambient temperature as a controlled environment for checking a relative
characteristic.
For applications with ambient temperature indication such as voltage reference,
resistance temperature detector (RTD), thermistor, and poly-switch, the battery
capacity or the measuring characteristic is referred on the operating
temperature and additional temperature coefficients. Thus, the ambient
temperature can only be used as a reference.
If you want to use a thermocouple other than the J or K type, you may use the
DC 60 mV range with a 1 μV resolution and the ambient temperature in your
application.
The bead-type thermocouple probe is suitable for measuring temperatures from
–40 °C to 204 °C (399 °F) in PTFE-compatible environments. Above this
temperature range, the probe may emit toxic gas. Do not immerse this
thermocouple probe in any liquid. For best results, use a thermocouple probe
designed for each specific application — an immersion probe for liquid or gel,
and an air probe for air measurement.
Observe the following measurement techniques:
– Clean the surface to be measured and ensure that the probe is securely
– When measuring above ambient temperatures, move the thermocouple
– When measuring below ambient temperatures, move the thermocouple
– Place the multimeter in a stable operating environment for at least 1 hour to
– Allow the multimeter to cool down after high current measurements.
Keysight U1241C/U1242C User's Guide
touching the surface. Remember to disable the applied power.
along the surface until you get the highest temperature reading.
along the surface until you get the lowest temperature reading.
obtain a stable reference of the ambient temperature for cold junction
compensation of thermocouple temperature measurements.
Making Measurements
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