Environmental Checks; Model 9000 Calibration Adjustment - Welch Allyn 9600 Operation Manual

Welch Allyn 9600 Calibration Tester
3. Ensure that the unit has not been exposed to extreme temperatures that
can damage the precision thermistors in the 9600 Tester. Exposure to
high heats can cause the resistance vs. temperature characteristic of the
unit to shift, causing the 9600 Tester to lose calibration. Never auto-
clave the 9600 Tester.

ENVIRONMENTAL CHECKS

1. Make sure there is no excessive moisture or steam in the air. High
humidity (above 96%) can cause electrical leakages that can temporarily
shift the temperature out of calibration. If the thermometers and/or the
9600 Tester have been exposed to such conditions, they should be
allowed to sit at normal room temperature for at least 30 minutes before
a calibration test is conducted.
2. Thermal gradients in the thermometer or the 9600 Tester can cause
unpredictable effects.
Two examples of exposure to extreme temperatures are:
Carrying the thermometer between buildings on a cold winter day,
Exposing the thermometer to the sun on a window sill.
3. Test the calibration at or near the normal room temperature for use of
the thermometer. If the room temperature is at the extreme ends of the
specified temperature range, a unit that is within specification under
normal usage temperatures could be out of calibration.

MODEL 9000 CALIBRATION ADJUSTMENT

This procedure allows for manual calibration adjustments of a Welch Allyn
Model 9000 Thermometer which has failed the Troubleshooting Test
described in this manual.
The Model 9000 (InstaTemp® and ThermoGuide™) Thermometer can be
placed into a special Test Mode for checking the calibration using the 9600
System.
The Test Mode is entered by simultaneously pressing the PULSE, TIMER,
and MODE switches and is signified by a "T" displayed on the thermometer
LCD.
12