Martel Electronics MC1010 - Manual (Page 13)

3.3 Measuring mA with Loop Power
To test a 2-wire, loop powered transmitter that is disconnected from wiring, use the loop
power function. This function activates a 24V supply in series with the current measuring
circuit. To use this option proceed as follows:
To measure mA with loop power follow these steps:
1. Use the [CONFIG] option from the main menu to select mA IN LOOP.
2. Connect leads as shown in Figure 7.
Figure 7. Connection Using Current Loop
3.4 Measuring Temperature
3.4-1 Using Thermocouples
The calibrator supports the following
thermocouple types: B, C, E, J, K, L, N, R, S, T, U,
BP, and XK. The characteristics of all the types are
described in Specifications section. The calibrator
also has a Cold Junction Compensation (CJC)
function. Normally this function should be ON and
the actual temperature of the thermocouple will be
measured. With CJC OFF, the calibrator will
measure the difference between the thermocouple
at the junction and at its TC input terminal.
Note: CJC off mode should only be used when calibration is being done using an external
ice bath.
To use the thermocouple to measure temperature, follow these steps:
1. Attach the thermocouple leads to the TC miniplug, and insert the plug into the
input/output of the calibrator, as in Figure 8.
Note: For best accuracy wait 2 to 5 minutes for the temperature between the miniplug and
the calibrator to stabilize before any measurements are taken.
2. Select the [CONFIG] option from the main menu.
3. Select TC from the primary parameters. Choose [IN] in the input/output control, and than
the thermocouple type from the sensor types. The temperature unit may also be changed
from Celsius to Fahrenheit.
13
TC IN
CJ=24.9 °C CJC ON
TYPE K
MENU
50.0 °C
LIGHT
– +
MEASURE / SOURCE
3W
mA+
TC
+
V
Hz
–
Ω
4W
mA–