Trimming The Selected Output - GE moisture.iq User Manual

4.1.3 Trimming the Selected Output

The measured value of the outputs can vary from the programmed value due to the effects of load resistance.
The Output Selection option provides a trimming feature you can use to compensate for any such variations. To
accurately trim the outputs, you will need a digital multimeter capable of measuring 0 to 2 V with a resolution
of ±0.0001 VDC (0.1 mV) or 0 to 20 mA with a resolution of ±0.01 mA, depending on your output settings. Most
good quality 3 1/2-digit multi-meters are adequate for output trimming. Complete the following steps to trim
output:
1. Make sure the Output Mode has been set for the desired output ( Current or Voltage ).
2. Temporarily disconnect the load from the output signal wires. The, attach the digital multimeter to the
signal wires either in series (for Current mode) or in parallel (for Voltage mode) with the load.
3. Tap the Channel (1-6) and Output ( A or B ) to be trimmed, and then tap the Trim button to open a screen
similar to Figure 45 below.
4. Tap the Reset Trim button to clear the current trim values.
5. Tap the Trim Zero button to output the zero value, and enter the value shown on your multimeter in the
Trim Zero text box.
6. Tap the Trim Span button to output the span value, and enter the value shown on your multimeter in
the Trim Span text box.
7. Tap the Exit button and test the output as described in "Testing the Selected Output" on page 50.
Note: The 0% of full scale value is: 1 mA for a 0-20 mA scale, 4 mA for a 4-20 mA scale or 0.1 V for a 0-2 V scale.
moisture.IQ User's Manual
Figure 45: Output Trim Screen
Chapter 4. Using the Outputs, Alarms and Logger Menus
51