Instruction Manual

DataView™ LI55 Level Controller Instruction Manual
86 | Page
Internal Source Calibration (ICAL)
The meter is factory calibrated prior to shipment
to read in milliamps and volts depending on the
input selection. The calibration equipment is
certified to NIST standards.
The use of calibrated signal sources is necessary to calibrate the
internal source of the meter. The meter’s internal source is what allows
the user to scale the meter without applying a signal.
Check calibration of the meter at least every 12 months. Each input
must be recalibrated separately.
Notes:
1. If meter is in operation and it is intended to
accept only one input type (e.g. 4-20 mA),
recalibration of other input is not necessary.
2. Allow the meter to warm up for at least
15 minutes before performing the internal
source 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 full main
menu. From Setup, press and hold the Menu button for 3 seconds
to access the advanced features of the meter.
2. Press the Up button to scroll to the
Internal calibration menu (ICAL)
and press Enter.
3. The meter displays either current calibration (
C CAL) or voltage
calibration (
v CAL), according to the input setup. Press Enter to
start the calibration process.
Example of Internal Calibration for current input:
4. The meter displays low input current message (C lo). Apply the
low input signal and press Enter. The display flashes for a moment
while the meter is accepting the low input signal.
5. After the display stops flashing, a number is displayed with the
leftmost digit brighter than the rest. The bright digit is the active digit
that can be changed by pressing the Up button. Press the Right
button to move to the next digit.
6. Set the display value to correspond to the input signal being
calibrated, typically 4.000 mA.