Precision Digital PD865 - Manual (Page 57)

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
μA 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.