PD865 Snooper Modbus
Serial Input Meter
Instruction Manual
57
4-20 mA Output Calibration
The 4-20 mA output can be calibrated in the field. A calibrated digital
meter with an input range of at least 25 mA and a resolution of 1
μ
A is
recommended.
4-20 mA Output Calibration Procedure
1. Wire the PD865 4-20 mA output to a current loop that includes a
power supply (internal or external 12 to 24 VDC), and the current
input on the digital meter.
2. Turn on all devices. Allow for a 15 to 30 minute warm-up.
3. Go to the Advanced Features menu, and navigate to the Analog
Output (
Aout
)/Calibration (
Calib
) menu and press Enter. Select
Manual calibration (
nmAn
) and press Enter.
4. The display will show
4 nmA
. The PD865 mA output should now
be close to 4 mA. Press Enter and the display will show
04.0000
.
Enter the actual value read by the digital meter and press Enter.
5. The display will show
20 nmA
. The PD865 mA output should now
be close to 20 mA. Press Enter and the display will show
20.0000
. Enter the actual value read by the digital meter and
press Enter.
6. The PD865 will now calculate the calibration factors and store
them.
!
If an uncalibrated meter or a meter with less resolution is used,
the calibration of the 4-20 mA output could be adversely affected.
There is no need to recalibrate the 4-20 mA output when
first received from the factory.
The 4-20 mA output is factory calibrated prior to shipment.
The calibration equipment is certified to NIST standards.
