Ashcroft ATE-100 Handheld LCD Digital Calibrator - Manual (Page 36)

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Revision 4.6 3/2004
Section 17.1 Thermocouple Measurement Set Up
Step 1 To begin measurement with a thermocouple,
first attatch the thermocouple to a male “miniature ther-
mocouple connector.” Please note that connectors are
specifically manufactured for each thermocouple type
and will be marked accordingly. Failure to use the prop-
erly mated connector will result in additional inaccuarcy.
Step 2 Turn the calibrator off. Install the thermo-
couple interface module into either of the modules bays
in the top of the calibrator. now install the thermo-
couple into the interface by inserting the male blades of
the miniature connector into the slots in the receptacle
located on the top of the thermocouple interface module.
Step 3 Turn the base unit on
When the display has completed the “power up” cycle,
press the “set up” key.
SET
UP
Using the arrow keys, select the words “TC Module”
TC Module
press the “enter” key.
ENT
If two thermocouple interface modules have been
installed, the calibrator will require a selection as to
which side (left or right) the current programming cycle
is to be applied. The display will read:
SELECT MODULE
LEFT RIGHT
Using the left or right arrow keys, select the module to
be programmed and press the “enter” key.
ENT
( Note: If only one thermocouple interface module is
installed, the left/right selection identified in the previ-
ous step will not appear. The process will begin with the
selection of engineering units identified below.)
The calibrator will display:
Engnring units:
ºC ºF ºK ºR mV
Using the left or right arrow keys, select the desired unit
of measure, and press enter. (Selection of the millivolt
readout will instruct the calibrator to display the voltage
within the thermocouple circuit. The internal reference
junction cannot be applied in this mode.)
no further base unit programming will be required. If
the millivolt mode has been selected, the programming
cycle will end when the “enter” key is pressed, and the
calibrator will begin to display the real-time millivolt
measurement from the thermocouple circuit.
ENT
The top display will now indicate the choices for the
thermocouple types. In addition, the lower line of the
display will indicate the 2 types of metal which com-
prise the thermocouple type which is currently flashing.
(By selecting a thermocouple type, the calibrator will
access the factory programmed coefficients which will
allow the calibrator to display in a unit of temperature
measurement).
TC: JKTERSBN
Fe - Cu/Ni
Using the left or right arrow keys, select the type of
thermocouple that has been installed,and press the
“enter” key.
ENT
The display will now indicate the resolution choices.
Resolution
1 .1 .01 auto
Using the left or right arrow keys, select the degree of
resolution closest to the working tolerance for the type
of thermocouple that has been installed or select the
“auto” mode (which will allow the calibrator to auto-
matically adjust the display to the greatest significant
resolution), and press the “enter” key.
ENT
The calibrator will now display the choices for the refer-
ence junction.
Ref junction:
auto manual
By selecting the “auto” mode, the calibrator will utilize
the internal thermistor/resistor based on the reference
junction that is resident inside the interface module.
The “manual” mode allows for the use of an external
reference junction. A stable temperature reference, usu-
ally in the form of an ice bath, is required.
Using the left or right arrow keys, select the desired
reference junction and press the “enter” key.
ENT
If the “auto” mode was selected, the calibrator will now
return to real-time measurement mode, displaying the
temperature measurement from the thermocouple and