Presys DMY-2015 Technical Manual page 39

Presys  Instruments
Once the calibrations with mV are done, access the CJC mnemonic inside
INPT option of level 5 for cold junction calibration.
Cold junction calibration
The CJC mnemonic must be accessed, which corresponds to the cold junction
temperature of the Indicator.
Pressing ENTER after the CJC mnemonic is reached starts the automatic
calculation of the cold junction temperature. Meanwhile the CAL mnemonic blinks on
the display.
After a few seconds, the program finishes the cold junction temperature
calculation and the display presents its value given in °C.
This value is a first approximation of the cold junction temperature. The user
must measure the temperature I/O terminals and correct the value presented by the
program following the same procedure for entering parameter values as explained on
section 3.2 of Configuration.
Then return to normal operation mode moving back until level zero.
Calibration of 2 and 3-wire RTD input
In a 3-wire RTD input calibration connect precision resistances with the values
listed in table 11 to the channel to be calibrated. For channel 1, for instance, the
resistance must be connected to terminals 1 and 2, with terminals 2 and 3 short-
circuited. See the terminals for RTD connection on table 3, section 2.3.2 on RTD
Input, or tables 6 and 7 on section 2.3.5 - Connection for Indicators with different
input types.
When using a resistance decade, make sure the three connection wires must
have the same gauge, material and length.
There is no procedure for a 2-wire RTD calibration. It is accomplished together
with the 3-wire RTD calibration.
Table 11 - Resistance references for 3-wire RTD input calibration
Maintenance
Página 36
Reference
100.000 
300.000 
DMY - 2015
Mnemonic
100r
300r