Martel Electronics PTC8010 - Manual (Page 12)

12
3.3 Measuring Temperature
3.3-1 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 7.
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 then
the thermocouple type from the sensor types. The temperature unit may also be changed
from Celsius to Fahrenheit or Kelvin.
The calibrator can also measure the mV signal from a Thermocouple, which can be used
along with a table in case the corresponding TC type is not supported by the calibrator. To do
so, proceed as above and choose mV from sensor types.
Figure 7. Measuring Temperature Using Thermocouple Terminals
3.3-2 Using Resistance-Temperature-Detectors (RTDs)
The supported types of RTDs are shown in Section 6. Specifications. RTDs are
characterized by their 0°C resistance, R0. The calibrator accepts two, three, and four wire
inputs, with four wire input being the most accurate.
To use the RTD option, apply the following steps:
1. Select the [CONFIG] option from the main menu.
2. Select RTD from the primary parameters. Select [IN] from input/output control.
TC IN
CJ=24.9 °C CJC ON
TYPE K
MENU
50.0 °C
LIGHT
+
–
TC PLUG
MEASURE/SOURCE
3W
! !
4W
RTD
TC
Note: The TC wire
used must match the
thermocouple type
being calibrated.