Welch Allyn 9600 Plus Calibration Tester - User Manual - Manual (Page 17)

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Operation
9600 Plus Calibration Tester Setup
Place the 9600 Plus Calibration Tester on a level surface
away from sunlight, drafts, and other sources of heat or cold.
The 9600 Plus Calibration Tester takes approximately 20
minutes to heat to the lowest setting. When testing several
thermometers at all three temperatures, it is recommended
to test all probes at one Calibration Set Point Temperature
before proceeding to the next Calibration Set Point
Temperature. To further expedite testing start at the lowest
Calibration Set Point Temperature. The 9600 Plus Calibration
Tester does not have an internal fan, causing the cool down
time to be greater than the time it takes to heat up.