Precision Digital PD662 - Manual (Page 23)

PD662 Loop-Powered Meter Instruction Manual
23
Internal Calibration (ICal)
• There is no need to recalibrate the meter for
milliamps when first received from the factory.
• The meter is factory calibrated for milliamps prior to
shipment. The calibration equipment is certified to
NIST standards.
The internal calibration allows the user to scale the meter without
applying a signal. The use of a calibrated signal source is necessary to
perform the internal calibration of the meter. Check calibration of the
meter at least every 12 months.
Notes:
• The signal source must have a full-scale accuracy
of 0.01% or better between 4 and 20 mA in order
to maintain the specified accuracy of the meter.
• Allow the meter to warm up for at least
15 minutes before performing the internal
calibration procedure.
The Internal calibration menu is part of the Advanced Features menu.
1. Press and hold the MENU button for 5 seconds to enter the
Advanced Features menu.
2. Press the Up arrow button to scroll to the Internal Calibration menu
(ICAL) and press Enter.
3. The meter displays 4.00 mA. Apply a 4.00 mA signal and press
Enter. The display flashes for a moment while the meter is
accepting the signal.
4. After the signal is accepted, the meter displays 20.00 mA. Apply a
20.00 mA signal and press Enter. The display flashes for a moment
while the meter is accepting the signal.
Error Message (Err)
An error message indicates that the calibration process was not
successful. After the error message is displayed, the meter will revert to
input 2 calibration settings. The error message might be caused by
inadvertently leaving the signal at the previous level or not maintaining a
0.40 mA minimum span. Press the Menu button to cancel the current
calibration process if necessary.