DataLoop™ LI25 Level Controller
Instruction Manual
MN301034 rev D
29
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 LI25
Series.
•
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 five
seconds
to access the Advanced
features of the meter.
2. Press
the
Up
arrow button to scroll to the
Internal calibration
menu (ICAL)
and press
Enter/Ack
.
3.
The meter displays 4.000 mA. Apply a 4.000 mA signal and press
Enter/Ack
. The display shows both trend arrows for a moment while the
meter is accepting the signal.
4.
After the signal is accepted, the meter displays 8.000 mA. Apply an 8.000
mA signal and press
Enter/Ack
. The display shows both trend arrows for a
moment while the meter is accepting the signal.
5.
Continue, as in the previous step, for the remaining signals: 12.000 mA,
16.000 mA, and 20.000 mA.
Error Message (Error)
An error message indicates that the calibration or scaling process was not
successful. After the error message is displayed, the meter reverts to the
previous signal prompt, allowing the appropriate input signal to be applied. The
error message might be caused by inadvertently leaving the signal at the
previous level.
