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4-20mA Outputs Calibration - The CTM-530 features a calibration adjustment for each of the 4-20mA
output loops. The outputs are factory calibrated but to achieve the best accuracy a qualifi ed technician can
adjust the output levels as required. A calibrated current meter must fi rst be connected to each output before
beginning the calibration procedure.
To access the 4-20mA calibration settings for output loop 1 enter the setup menu and select the “14: LOOP
1 CAL” sub-menu item and press the “OK button. The “LOOP 1 CAL:” start menu will be displayed.
SETUP: TECH
12: COLD JUNCTION
13: TC CAL
14: LOOP 1 CAL >
LOOP 1 CAL:
ADJUST L/R FOR FINE
UP/DN FOR COARSE
SOURCING 4.00mA
Menu Screen Loop 1 - 4mA Calibration Screen
The CTM-530 will immediately output 4mA on Loop 1. Use the left and right navigation buttons for
coarse adjustments and the up and down navigation buttons for fi ne adjustments. Adjust the output until it
is as close to 4mA as possible then depress the center “OK” button.
LOOP 1 CAL:
ADJUST L/R FOR FINE
UP/DN FOR COARSE
SOURCING 20.00mA
LOOP 1 CAL:
PRESS OK TO VERIFY
ESC TO REPEAT CAL
SOURCING 12.00mA
Loop 1 - 20mA Calibration Screen Loop 1 - 12mA Confi rmation Screen
The CTM-530 will then output 20mA on Loop 1. Use the left and right navigation buttons for coarse ad-
justment and the up and down navigation buttons for fi ne adjustment. Adjust the output until it its as close
to 20mA as possible then depress the center “OK” button.
The CTM-530 will then output 12mA on Loop 1. The reading should be very close to the required output.
To verify the calibration was successful press the “OK” button and you will be returned to the setup menu.
Follow this procedure using the setup menu “LOOP 2 CAL” menu item to calibrate the Loop 2 4-20mA
output.
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