Precision Digital Corporation ProtEX-MAX PD8-6100, Instruction Manual

Page: 53 / 64

ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
53
Analog Output Programming
(
AoutPr
)
The Analog Output Programming menu is used to
program the behavior of the 4-20 mA output. The
following parameters and functions are programmed
in this menu:
1. Source: Source for generating the 4-20 mA
output (e.g. PV)
2. Overrange: Analog output value with display in
overrange condition
3. Underrange: Analog output value with display in
underrange condition
4. Max: Maximum analog output value allowed
regardless of input
5. Min: Minimum analog output value allowed
regardless of input
6. Calibrate: Calibrate the internal 4-20 mA source
reference used to scale the 4-20 mA output
Analog Output Source
The source for generating the 4-20 mA output may be
assigned to the process variable, maximum or
minimum value reached by the process, one of the
set points, or the Modbus PV input.
Analog Output Calibration
To perform the analog output calibration, it is
recommended to use a milliamp meter with a
resolution of at least 0.1 µA to measure the output
current. The values saved internally during this
procedure are used for scaling the 4-20 mA output in
the
Setup menu.
Analog Output Calibration
Procedure
1. Wire the PD8-6100 4-20 mA output to a current
loop that includes a power supply (internal or
external 12 to 24 VDC), and the mA input on the
digital meter. See
Figure 21. 4-20 mA Output
Connections on page 29 for details.
2. Turn on all devices. Allow for a 15 to 30 minute
warm-up.
3. Go to the Advanced Features menu, navigate to
Select (
Select
) and choose Analog Output
Programming (
AoutPr
)/Calibration (
Calib
) menu
and press Enter .
4. The display will show
4 nmA
. The PD8-6100 mA
output should now be close to 4 mA. Press Enter
and the display will show 04.000. Enter the actual
value read by the digital mA meter and press
Enter .
5. The display will show
20 nmA
. The PD8-6100 mA
output should now be close to 20 mA. Press
Enter and the display will show 20.000. Enter the
actual value read by the digital mA meter and
press
Enter .
6. The meter will now calculate the calibration
factors and store them.
7. Press Menu to exit and return to Run mode.