Amprobe ACDC-620T User Manual page 42

To perform dual input and/or differential temperature measurement:
1) Set the rotary switch to "TEMP. Ω ".
2) Insert the model DKTA-620 Dual Type K thermocouple adapter into the meter.
The "+" end of the adapter must be inserted into "V - Ω - µF" terminal.
3) 1 nsert two of the model TPK-56 Type K thermocouples into the DIKTA-620.
4) Secure the beaded end of the K thermocouples to the surfaces you wish to
measure.
5) Press SHIFTbutton momentarily to enter temperature measurement mode.
The "T1 T2' annunciator will be displayed.
6) Since the displayed temperature will be based on the position of the selector
switch located on the DKTA-620 adapter, select either T1 or T2 for the desired
measurement.
7) Read the display.
To measure differential temperature:
Note: T1 temperature must be greater than T2 for
differential measurement to be correct.
1 ) Set the DKTA-620 selector switch to the "T1-T2" position.
∆T
2) Push the button on the ACDC-620Tmomentarily to enter the Differential
Temperature Mode. The "TI-T2" and "A" annunciators will be displayed.
3) Read the displayed differential temperature.
4) For information on basic refrigeration theory refer to page 56.
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