Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 78)

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Revision 4.6 3/2004
APPEnDIX E
Certification of the TC1 Thermocouple Interface Module
ThEORy
With the TC1 module installed in the base unit (set-up to display in mV), a precision millivolt calibrator/supply will
apply a known mV signal to the module/base unit system (simulating the Seebeck voltage) in place of a thermocouple.
The applied mV signal can then be read on the base unit display and compared to the nominal input provided by the
precision millivolt calibrator/supply. The TC1 module cannot be adjusted. If the module will not meet the specified ac-
curacy, contact the factory or instrument supplier.
CERTIfICaTION PROCEDuRE
1. Remove all existing modules from the base unit (handheld calibrator firmware rev. 3.01 or later, digital indicator
firmware 2.00 or later) and install the TC1 in the either module bay.
2. Attach copper wire to the + and - terminal posts of a precision millivolt calibrator/source, rated at .0025% or better.
3. Wire the opposite end of the wires to a miniature “U” type (copper-copper) thermocouple connector, and plug the
connector into the receptacle located in the top of the TC1 module.
4. Turn on the millivolt calibrator/source and adjust until it is supplying 0mV to the TC1 module.
5. Turn on the base unit by pressing the on-off switch. Allow the base unit to complete its startup routine.
6. Press the “Setup” button.
7. Using the arrow key, toggle once to the right and down 7 times until “TCmodule” is flashing.
8. Press enter.
9. Set engineering unit to “millivolt” by pushing the right arrow button until “mV” is flashing.
10. Press enter.
11. While the precision millivolt calibrator/source is providing 0mV to the module, read the mV display on the base
unit.
12. If the reading is within ± .01 millivolts, the base unit/TC1 system is within specification and may be certified.
13. Repeat the certification procedure at 50 and 100 mV.