Level 2 Calibration Test - Welch Allyn 9600 Operation Manual

Welch Allyn 9600 Calibration Tester

LEVEL 2 CALIBRATION TEST

Usually thermometer calibration will fall within the +/-0.3ºF tolerance limit
when tested in the 9600 Calibration Tester. This tolerance is the result of
two elements: the thermometer system contributing +/-0.2ºF, and the 9600
Tester contributing +/-0.1ºF to the test reading.
If a Level 1 reading is greater than +/-0.3ºF from the temperature selected,
try the "Level 2 Calibration Test". If the Level 2 Test is not successful, then
proceed to the TROUBLESHOOTING Section.
There are several variables that must be checked before concluding that a
thermometer is out of calibration. They are described on the following
pages.
LEVEL 2 CALIBRATION TEST
If the Level 1 Calibration Test is not successful - that is, if the reading is
greater than +/-0.3ºF from the temperature selected - conduct the Level 2
Calibration Test.
1. Check to see that the 9600 READY indicator is on continuously. It
should not go out unless the temperature selection is changed. If the
READY indicator goes out occasionally, be sure the unit is away from
drafts, direct sunlight, and other heat and cold sources, and that there is
continuous power to the unit.
If the READY indicator does not come on, but the unit reads close to
the temperature selected then there is an internal malfunction and the
temperature is being controlled by the Over-Temperature Protection
Circuitry. This temperature is not a calibrated temperature and cannot
be used to test thermometers. If this should happen, the 9600 Unit
should be returned to the factory for repair.
2. Check the temperature of the room. It must be within 65ºF and 80ºF
(18.3ºC and 26.7ºC).
3. For Model 9000 and Model 9020 Thermometers, use the following
procedure.
Ensure that the sensor is free from debris. To do this, first load a
probe cover, then peel the probe cover off the tip. If the tip appears
clean, retract the probe. If you see dust or other debris on the tip,
clean the surface following the first 2 steps of the procedure in the
Model 9000 CALIBRATION ADJUSTMENT Section of this manual.
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