Helios Large Display Dual Analog Input Rate/Totalizer Instruction Manual
PD2-6262
58
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
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. Select channel A (
Ch-A
) or channel B (
Ch-b
) and press enter.
4. 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:
5. 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.
6. 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.
7. Set the display value to correspond to the input signal being calibrated, typically 4.000 mA.
8. The display moves to the
high
input
calibration (
C Hi
). Apply the high
input signal and press Enter.
9. 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.
Error Message (
Error
)
An error message indicates that the calibration or scaling
process was not successful.
The error message might be caused by any of the following
conditions:
1. Input signal is not connected to the proper
terminals, or it is connected backwards.
2. Wrong signal selection in
Setup
menu.
3. Minimum input span requirements not maintained.
