Presys DMY-2011, Technical Manual, Page: 42 / 50

PRESYS
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Instruments
DMY-2011, DMY-2035 and DMY-2036
Maintenance
Page 40
Calibration of current input (0 to 20mA)
In a 0 to 20mA current input calibration connect a current source to the
channel to be calibrated (terminals 1(+) and 3(-) for channel 1 or 4(+) and 6(-) for
channel 2). It is required 6 current references listed in table 9.
Reference Mnemonic
0.000 mA C. 0nA
4.000 mA C. 4nA
8.000 mA C. 8nA
12.000 mA C.12nA
16.000 mA C.16nA
20.000 mA C.20nA
Table 9 - References for 0 to 20mA input calibration
Input Calibration in thermocouple
There are two steps for calibrating the thermocouple input. First, calibrate the
0 to 55mV input and the 0 to 5V input for the channel to be calibrated (terminals 2(+)
and 3(-) for channel 1 or 5(+) and 6(-) for channel 2) according to tables 6 and 7.
Once the mV calibrations are done, access the CJC mnemonic in the INPUT option
of level 5 for cold junction calibration.
The CJC mnemonic corresponds to the cold junction temperature of the
Indicator.
By pressing ENTER after the CJC mnemonic is reached the automatic
calculation of the cold junction temperature starts. 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.
When these two steps are done the input calibration for any type of
thermocouple is accomplished.
Then return to normal operation mode moving back until level zero.
Calibration of 2 or 3-wire RTD input
In a 3-wire RTD input calibration connect precision resistances with the values
listed in table 10 to the channel to be calibrated (between terminals 1 and 2 with 2
and 3 short-circuited for channel 1 or between terminals 4 and 5 with 5 and 6 short-
circuited for channel 2).
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