SITRANS RD300
A5E31917845
SITRANS RD300 – OPERATING INSTRUCTIONS
Page 85
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 three 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.
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
arrow button. Press the
Right
arrow button to move to the next digit.
6. Set the display value to correspond to the input signal being
calibrated, typically 4.000 mA.
7. The display moves to the
high
input calibration (
C Hi
). Apply the
high input signal and press Enter.