Calibration Of Multiple Probes - Fluke 6102 User Manual

6102 Micro-Bath User's Guide

Calibration of Multiple Probes

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bath work area. Nevertheless, probes should be inserted to the same depth in the bath
liquid. Be sure that all probes are inserted deep enough to prevent stem effect. From
research at Hart Scien tific, we suggest a general rule-of-thumb for immersion depth
to reduce the stem effect to a minimum: 15 x the diameter of the UUT + the sensor
length. Do not submerge the probe handles. If the probe handles get too warm
dur ing calibration at high temperatures, a heat shield could be used just below the
probe handle. This heat shield could be as simple as aluminum foil slid over the probe
before inserting it in the bath or as complicated as a specially designed reflective metal
apparatus.
When calibrating over a wide temperature range, better results can generally be
achieved by starting at the highest temperature and progressing down to the lowest
temperature.
Probes can be held in place in the bath by using probe clamps or drilling holes in the
access cover. Other fixtures to hold the probes can be designed. The ob ject is to keep
the reference probe and the probe(s) to be calibrated as closely grouped as possible in
the working area of the bath. Bath stability is maximized when the bath working area
is kept covered.
In preparing to use the bath for calibration start by:
Placing the reference probe in the bath working area.
Placing the probe to be calibrated, the UUT, in the bath working area as close as
feasibly possible to the reference probe.
Calibration of Multiple Probes
Fully loading the bath with probes increases the time required for the tempera ture to
stabilize after inserting the probes. Using the reference probe as the guide, be sure that
the temperature has stabilized before starting the calibration.
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