User manual

ManualsBrandsGOSSEN METRAWATT ManualsTest EquipmentMETRAHIT MULTICAL Calibrator Voltage, Amperage, Temperature 2 x AA battery (included) Calibrated to DAk

50 GMC-I Messtechnik GmbH

Calibration Functions: V – Hz –  – Temp – mA – mA

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 measuring 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).

No external voltage may be applied to the calibrator jacks

in this operating mode.

The calibrator is protected against brief application of large

external voltages with a replaceable fuse in the event of

operator error (see section 10.3).

–+ +

Device to be

Terminal Block

Equalizing Leads

Device to be

Copper Wire

Temperature

measurement,

e.g. using multi-

meter with tem-

perature sensor

Example for a)

Internal Ref. Junction

Example for b)

External Ref. Junction

calibrated