24
4.2.2 Calibrating using a Millivolt Source
1.
Disconnect the power from the meter.
Remove the
front lens. Notice the the zero potentiometer is located
to the left of the display and the span potentiometer is
located to the right of the display.
Refer to
Figure 4-1
for the location of the calibration
pots.
2.
Connect the millivolt source to the MCJ Electronic Ice
Point or ice bath which in turn connects to the
thermocouple input connector P3 as shown in Figure
4-3. Connect the negative (red) thermocouple wire to
connector P3, Pin 1. Connect the positive
thermocouple wire to connector P3, Pin 2. Be sure to
observe polarity and use the correct thermocouple
wire (Type J wire for Type J meter).
Figure 4-3. Calibration with a Millivolt Source
METER
P3
P2
P1
T/C WIRE
mV SOURCE
COPPER WIRE
ICE BATH
AC
METER
P3
P2
P1
T/C WIRE
AC
mV SOURCE
COPPER WIRE
OMEGA
MCJ
OMEGA
TRP PROBE