Front-Panel Operation
Set Output
4
4-43
•
Meas@TC
terminal (Measurement at the front panel TC terminals) Shows the
actual dc voltage at the front panel TC terminals. This is a display only, not a softkey
function.
•
TC MENUS
(Thermocouple Menus) Opens the thermocouple output submenus.
o
Open TCD
(Open Thermocouple Detect) Selects on or off for the Open TCD
feature. When Open TCD is on, a small electrical pulse checks for thermocouple
continuity that, in most cases, will have no effect on the measurement. If you
measure the thermocouple with the Calibrator in parallel with a different
temperature-measure device, select off for Open TCD. When an open
thermocouple is found, “Open TC” is shown in the TC menu as a positive
identification of the fault.
o
UNITS
(Temperature Units) Selects
°
C or
°
F as the temperature unit.
o
REF SRC
(Reference Source) Selects intrnl (Internal) or extrnl (External)
temperature reference source. The reference source shows the ambient
temperature contribution to the thermocouple output, this is necessary to
remember when you simulate an accurate temperature output. Select intrnl when
the selected thermocouple has alloy wires and you use the isothermal block
internal to the Calibrator. Select extrnl when you use an external isothermal
block, and when the selected thermocouple has copper wires. Push the REF
softkey to record the value of the external temperature reference.
o
REF
(Temperature Reference) Shows the value of the temperature reference.
When the Reference Source is Internal, the display shows the internal reference.
When the Reference Source is External, the display shows the value you
recorded for external reference.
o
OFFSET
(Measurement Display Offset) Selects an offset value to be added or
subtracted from the actual measurement. This is useful for differential
measurements (temperatures above and below a necessary temperature).
o
TYPE
(Thermocouple Type) Selects the thermocouple type used for
measurement. The default is K. (The 10
μ
V/
°
C setting is used for customer-
supplied linearizations. 1 mV/%RH and 1 mV/
°
C settings are used for the
Vaisala humidity/temperature probes.)
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