ProtEX-MAX PD8-6200 Explosion-Proof Analog Input Rate/Totalizer Instruction Manual
56
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 traceable 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.
8. Set the display for the high input calibration, in
the same way as it was set for the low input
calibration, typically 20.000 mA.
The graphic shows the calibration of the current
input. The voltage input is calibrated in a similar
way.
Tips:
•
Low and high input signals can be any valid
values within the range of the meter.
•
Observe minimum input span requirements
between input 1 and input 2.
•
Low input should be less than high input signal.
programmed.
The error message might be caused by any of the following conditions:
3. Minimum input span requirements not maintained.
Input 1 signal inadvertently applied to calibrate input 2.
The minimum input span is the minimum difference between input
1 and input 2 signals required to complete the calibration or scaling
Input range Input 1 & input 2 span
4-20 mA
0.15 mA
10 VDC
0.01 VDC
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