Precision Digital PD6820 - Manual (Page 42)

PD6820 Loop-Powered Process Meter Instruction Manual
42
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 0.002% 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.
Press and hold the MENU button for 5 seconds to enter the Advanced features
menu. Press the Up arrow button to scroll to the Internal Calibration menu (ICAL) and
press Enter.
The meter displays 4.000 mA. Apply a 4.000 mA signal and press Enter. The display
flashes for a moment while the meter is accepting the signal.
After the signal is accepted, the meter displays 20.000 mA. Apply a 20.000 mA signal
and press Enter. The display flashes for a moment while the meter is accepting the
signal.
Error Message (SPAN ERROR)
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 the minimum span. Press the Menu button to cancel the
current calibration process if necessary.
Information (INFO)
The Internal calibration menu is part of the Advanced features menu. It shows
software identification number and version number. To determine the software
version of a meter:
Go to the Information menu (INFO) and press Enter button.
Continue pressing Enter to scroll through the software release number and software
version.
Following the information display, the meter will exit the Advanced features menu and
return to run mode.