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b. Use an interface agent (such as silicone grease)
between the thermocouple probe and the surface
you are measuring.
c. Use a thermal epoxy to attach the thermocouple.
2. When measuring higher than ambient temperatures,
adjust the connection between the probe and the
surface until you obtain the highest temperature
reading. To ensure a good connection, see the
suggestions above.
3. When measuring lower than ambient temperatures,
adjust the connection between the probe and the
surface until you get the lowest temperature reading.
To ensure a good connection, see the suggestions
above.
4. When measuring near ambient temperatures, make the
reading when the multimeter readout is most stable.
TROUBLESHOOTING
With no heat or cold applied to the bead, the measuring
instrument should display the ambient temperature. If the
measuring instrument does not readout properly, try the following:
1. Verify that the temperature measuring instrument is
designed to be used with Type K thermocouples. It
should have a yellow input connector and / or be
marked with a “K”.
2. Check for an open circuit indicator on the measuring
instrument. Some temperature measuring instruments
have a built-in circuit to indicate if the connected probe
is open. (All Fluke instruments have this feature.) Refer
to the measuring instrument’s owner’s manual to see if
this feature is available.
If you suspect a broken connection, use an ordinary
ohmmeter to check its continuity from pin to pin. The
ohmmeter should read 10 Ω or less if there is
continuity.
3. Short the two input pins of the measuring instrument
with a piece of wire. If the instrument is functioning, it
should indicate the ambient temperature.