Test Probe Calibration - Fluke 9103 User Manual

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Test Probe Calibration

For optimum accuracy and stability, allow the calibrator to warm up for 25
minutes after power-up and then allow adequate stabilization time after reach-
ing the set-point temperature. After completing operation of the calibrator, al-
low the well to cool by setting the temperature to 25°C for one-half hour before
switching the power off.
Calibrating a Single Probe
Insert the probe to be calibrated into the well of the calibrator. Best results are
obtained with the probe inserted to the full depth of the well. Once the probe is
inserted into the well, allow adequate stabilization time to allow the test probe
temperature to settle as described above. Once the probe has settled to the tem-
perature of the well, it may be compared to the calibrator display temperature.
The display temperature should be stable to within 0.1°C degree for best re-
sults. Never introduce any foreign material into the well.
Stabilization and Accuracy
The stabilization time of the calibrator depends on the conditions and tempera-
tures involved. Typically the test well will be stable to 0.1°C within 6 minutes
of reaching the set-point temperature. Ultimate stability will be achieved 30
minutes after reaching the set temperature.
Inserting a cold probe into a well requires another period of stabilizing depend-
ing on the magnitude of the disturbance and the required accuracy. For exam-
ple, inserting a .25 inch diameter room temperature probe at 125°C takes 5
minutes to be within 0.1°C of its settled point and takes 6 minutes to achieve
maximum stability.
Speeding up the calibration process can be accomplished by knowing how soon
to make the measurement. Typical measurements should be made at the desired
temperatures with the desired test probes to establish these times.
Fluke-Direct
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Calibrating a Single Probe
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