Fluke 5626 User Manual page 22

5626/5628
User's Guide
Data unstable
Temperature readout different than
expected, e.g. the heat source is set at
300 °C, the PRT measures 275 °C.
8-2
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several times this annealing process
should return R to within calibration
tp
tolerances. If the R is within calibration
tp
tolerance, the PRT is usable. If the R
not within calibration tolerance, but it is
stable, recalibrate the PRT.
If the data is unstable at the Triple Point of
Water (TPW), check the connector. If the
connector is correct, contact an
Authorized Scientific Service Center (see
Section 1.3). The PRT may be damaged
and need repair.
If the data is unstable at high
temperatures, it may be due to electrical
noise in the system. Reduce the
temperature and observe the data. If it is
stable, electrical noise is interfering with
the measurements at high temperatures.
Check the grounding of the readout device
and the heat source. A faulty ground on
either device could interfere with high
temperature measurements. A ground
wire attached to the metal sheath of the
PRT may help to reduce electrical noise
interference.
Measure the PRT resistance at TPW.
If the resistance of the PRT is less than
the rated resistance, e.g. 70 Ω for the
5626, there may be a short in the sensor.
Contact an Authorized Scientific Service
Center (see Section 1.3).
If the resistance of the PRT is only a few
ohms, there may be a short in the four
lead-wires. Contact an Authorized Service
Center (see Section 1.3).
If the PRT is open, the resistance will be
"Out of Limits" or in the kilo-ohm or mega-
ohm range. Contact an Authorized Service
Center (see Section 1.3).
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is
tp