Precision Digital PD6870 - Manual (Page 14)

PD6870 Loop-Powered Process Meter Instruction Manual
14
Setting Up the Meter
Calibrating the Meter
The meter is provided factory calibrated to display -50.0 at 4 mA and 150.0 at 20 mA.
HI and LO coarse and fine controls are labeled on the front of the display. Use the HI
and LO controls for large range changes during calibration and the HI FINE and LO
FINE controls for precision changes.
Apply a 4 mA signal and adjust the LO controls to display the desired reading. Apply
a signal between 16 and 20 mA and adjust the HI controls to display the desired
reading. Complete the calibration procedure by making minor adjustments to the LO
and HI controls as necessary.
Minimum & Maximum Input Span
A minimum input span of 20 counts is required between a 4 mA and 20 mA input. A
maximum input span of 2000 counts may be setup between a 4 mA and 20 mA input.
The meter will not properly calibrate or display if these minimum and maximum span
ranges are not maintained during scaling.
Setting the Decimal Point
Decimal point may be set using a three position jumper on the rear of the display
module. To access the connectors, unscrew the two captive screws that fasten the
display module. Remove the display module and place the jumper on the desired
pins as indicated on the board for decimal point locations of D.DDD, DD.DD, DDD.D,
or remove it if no decimal point is desired.