ANALOG OUTPUTS (CALIBRATION MENU: OUT)
The EI’ series furnishes an analog 4-20mA (milliamp) signal for
transmission to a remote system such as a SCADA or RTU for
each channel (up to four). From the factory, the calibration is
within 0.5% of 4mA and 0.5% of 20mA or better. Therefore, it is
recommended that one performs a 4-20mA calibration
adjustment for each channel if a more accurate matching
between the meter and user system is required.
To access the analog output calibration/test mode, press MNU, CAL, enter password (see
password section) if enabled, and then press the OUT pushbutton.
ANALOG OUTPUT TEST
This parameter tests both Digital to Analog Converters using ten, linear 1.6mA steps from
4.00 mA to 20.00 mA.
The analog outputs are active (self powered). Therefore, the
load must be passive (voltage/potential free) so no damage
occurs to the EI-4000 (EI-2000S-CPU) or the user’s system.
The “R LOAD” resistance can range from 0 to 510 ohms. When
one is calibrating the analog outputs, the “R LOAD” represents
the DMM or 4-20mA calibrator device.
Note: The –L & -R (terminals 1 & 3) are connected and this must be taken into
consideration when connecting the load to the analog outputs. Refer to schematic
above.
ANALOG 4mA and 20mA POINT ADJUSTMENT PARAMETERS
Each analog output is calibrated to 4mA and 20mA points, so each of the up to four analog
outputs has a 4mA and 20mA point setting – see the parameters below:
ANALOG OUTPUT 4.00 mA (ZERO) ADJUSTMENT
Press the ADJ pushbutton, and then set the left 4.00 mA analog
output point using the UP and DOWN pushbuttons. The display
will not show any indication that the left analog output is
changing which is why one should have a "mA" meter (i.e., DMM) connected to the
appropriate output. The mA output range is approximately 4.0 mA +/- 1.0 mA. Press ENT
when finished adjusting the 4 mA output point.
ANALOG OUTPUT 20.00 mA (SPAN) ADJUSTMENT
Press the ADJ pushbutton, set the left 20.00 mA analog output
point using the UP and DOWN pushbuttons. The display will not
show any indication that the left analog output is changing
which is why one should have a "mA" meter (i.e. DMM) connected to the appropriate output.
The mA output range is approximately 20.0 mA +/- 1.0 mA. Press ENT when finished
adjusting the 20 mA output point.
TEST ANALOG OUT
NXT LAST ADJ ESC
AOUT TEST 4.0mA
UP DOWN ESC
AOUT-1 4.0mA
NXT LAST ADJ ESC
AOUT-1 20.0mA
NXT LAST ADJ ESC