TABLE 3-1
MODEL 871A AND MODEL 872A
CONTROLS AND INDICATORS
ITEM
CONTROL/INDICATOR
FUNCTION
1.
ON/OFF switch
Turns unit on or off.
2.
Scale and range selector
Allows user to select: ºF or ºC scale,
any of four possible thermocouple
ranges, and 1.0º or 0.1º resolution.
3.
Thermocouple selector
Allows user to read either of two
thermocouples by simply turning
the dial.
4.
Thermocouple input jacks
Allows direct connection of two
thermocouples to the unit via an
OMEGA miniature male connector.
5.
Analog output jack,
The analog output is a nonlinearized,
+mV OUT and -mV OUT
cold junction compensated, amplified
thermocouple output. (Not isolated
from selected TC input.) Use a
recorder to monitor temperature or
a sensitive DMM to make higher
resolution reading. Refer to mV
output specifications for mV output
to temperature ratios.
6.
Low battery indicator
When the battery level is low, BAT
will appear in upper left corner of
the display. Battery should then be
replaced to avoid error erroneous
readings due to battery failure.
7.
Overrange/open
When an overrange indication or
thermocouple indication
open thermocouple condition exits,
a 1 followed by blanked digits will
appear in the display.
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