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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 multimeters 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 (
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.
Channel (1-6)
3. Tap the
to Figure 45 below.
Reset Trim
4. Tap the
Trim Zero
5. Tap the
Zero
text box.
Trim Span
6. Tap the
Span
text box.
Exit
7. Tap the
button and test the output as described in "Testing the Selected Output" on page 48.
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 Guide
Output
A
B
and
(
or
) to be trimmed, and then tap the
Figure 45: Output Trim Screen
button to clear the current trim values.
button to output the zero value, and enter the value shown on your multimeter in the
button to output the span value, and enter the value shown on your multimeter in the
Chapter 4. Using the Outputs, Alarms and Logger Menus
Current
Voltage
or
).
Trim
button to open a screen similar
Trim
Trim
49
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