CPT
14
The Interface Solution Experts
PC-Programmable Signal
Isolater/Converter
Output Trim
Output Trimming increases the measurement accuracy
of your CPT by calibrating its output to the device
that is receiving the output. This ensures that the
instrument is being correctly interpreted.
Before you attempt to perform the Output Trim
function ensure that the Status section of the screen
indicates “Measurements Off”. To do this click the
Mode dropdown box, from the menu bar, and select
“Measurements Off”.
1. Review your Model Number label to determine if
your unit is built for Current (0-20mA) or Voltage (0-
10V) output.
2. Attach a multimeter to the analog output and select
the “4mA” or “0V” button (whichever is appropriate).
Use the scroll bar to trim the measured output to your
desired value.
3. With the multimeter still connected select the
“20mA” or “10V” button (whichever is appropriate).
Use the scroll bar to trim the measured output to your
desired value.
4. To enable Output Trim and the values stored, click
the “Output Trim ON”.
5. Set Status back to “Measurements On”.
If selected, the User trim values will be used and the
manufacturer settings will be nullifi ed.
Loop Test
A Loop Test may be performed in order to check
output performance and accuracy and to trim other
instruments in the loop. Your output will be a current
value, in mA, or a voltage equal to the value you input.
You can check the other current devices on the loop
and calibrate them to this signal.
This feature is independent of the input. If you fi nd
that the output requires adjustment you may perform
the Output Trim function.
1. To use the Loop Test function select the Mode
dropdown box in the Communications bar and select
“Measurements Off”.
2. Next, in the “Output Value %” box, type the
percentage of the output value you wish to test. You
may also use your mouse, left click and adjust the
scroll bar to adjust to your desired value. Hit “Enter”.
3. In the “Output Value” box enter the value, within
your confi guration range, that you wish to signify as
your output value. Hit “Enter”.
4. Perform your test and calibration.
5. When you are fi nished, return to Mode in the
Communications bar and reset your status to
“Measurements On”.
