Installation, Operation, & Maintenance Instructions
IOM J500.35
2021.04
JMT
● +1.440.572.1500
17
4.2.9 Calibration
DAC Trim (Digital to Analog Converter)
The purpose of the DAC trim is to calibrate the current
output of the transmitter. This process should only be
done with a NIST (National Instrument of Standard and
Technology) traceable multimeter, AND the transmitter must be
offline from any control processes.
First connect your NIST Traceable Multimeter
in series with the
Loop power on the Negative side
. Select 4-20 mA Loop DAC
Trim.
Press
Enter
and the transmitter output will go to 4mA, and
prompt to enter the measured current output on the multimeter.
NOTE: These should be very subtle changes, ex 4.000 may
read 4.004 (requiring 4.004 to be entered)
Large changes would indicate a problem with set up or even
possible damage to the JMT
Once complete, the transmitter output will go to 20mA, and
prompt to enter the measured current output on the multimeter.
Once complete, it will revert back to the
Calibration
menu.
