Calibration Bath
Bath Use
15
W
Caution
Do not submerge the probe handles. If the probe handles get
too warm during 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 object
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
temperature to stabilize after inserting the probes. Using the reference probe as
the guide, be sure that the temperature has stabilized before starting the
calibration.
