User Manual

GMC-I Messtechnik GmbH 13
Function Description and Applications
10 different types of thermocouples can be selected, and can be
simulated within the temperature ranges specified by IEC/DIN.
Selection can be made between an internally measured reference
junction temperature, or numeric entry of an external reference
junction temperature within a range of –30 to +60 °C.
Important Notes Regarding Reference Temperature
Internal reference temperature is continuously measured with an
integrated temperature sensor. The reference temperature is
generally measured at the thermocouple connector jack for
devices to be calibrated with a thermocouple measurement input.
The two measurements may yield different results, and
differences are registered as errors during thermocouple
simulation. The following methods help to reduce this error:
a) The device to be calibrated is connected to the jacks at the
calibrator with equalizing leads for the thermocouple to be
simulated.
b) The temperature of the thermocouple connector jack at the
device to be calibrated is measured with a precision
temperature measuring instrument, and the resulting value is
entered to the calibrator as a reference temperature. The
calibrator and the device to be calibrated are connected with
copper wire.
Otherwise, the external reference temperature is entered in all
cases where temperature measurement at the device to be
calibrated is accomplished by means of a thermostatic reference
junction (end of the thermocouple equalizing lead).
Attention!
!
No interference voltage may be applied to the calibrator
jacks in this operating mode.
The calibrator is protected against brief application of a
large interference voltage with a replaceable fuse in the
event of operator error (see section 12.3).
Output
CALIBRATOR
+
–
Output
CALIBRATOR
+
–
Device to be
Terminal Block
Equalizing Lead
Device to be
Copper Wire
Temperature measurement,
e.g. via multimeter with
temperature sensor
Example for point a),
internal reference junction
Example for point b),
external reference junction
Calibrated
Calibrated