
Page 11
Practical Instrument Electronics
Tel: 585.872.9350 • Fax: 585.872.2638 • sales@piecal.com • www.piecal.com
Operating Instructions
Power/Measure mA, Power/Measure % (Percent of 4 to 20 mA)
Choose this function to simultaneously supply power to a 2 Wire Transmitter
while displaying the 4 to 20 mA output of the transmitter.
Move the power switch
w
to READ then Double Click the EZ-DIAL knob to get
into the Double Click Menu. Turn the knob
e
to scroll through the settings and
press the knob to make your selection. Select mA for the FUNCTION and PWR
MEAS for the MODE. Choose either mA or % and whether you need the 250
Ω
HART resistor active in the loop.
Disconnect one or both input wires from the device to be calibrated. Connect the
red source lead of the PIE 820PM from jack (5) to the plus (+) input of the device
and the black source lead from jack (6) to the minus (-).
The PIE 820PM supplies a nominal 24 volts DC at 24 mA to the 2 Wire
Transmitter. The current passed by the transmitter will be accurately displayed by
the PIE 820PM. Calibrate the transmitter in the usual manner and disconnect the
PIE 820PM. Signals above 24 mA are current limited by protection circuitry with
“OVER RANGE” on the display and the red OVERLOAD LED lit.
MAX
READ
MIN
READ
5
6
-
+
-
3 2
-2
OFF
HI
SET
LO
SOURCE
Transmitter Input
Sensor
Process Signal
Simulated Input
Typical
2-Wire
Transmitter
- IN +
REF
+OUT-
5 6
+
-
%
mA
28.20
PWRM
Hz SYNC
PRACTICAL INSTRUMENT ELECTRONICS
MODEL 820PM
Process Calibrator
mA · V ∙ TC · Ω · RTD · Hz
Double Click
Menu
Push & Turn for
Fast Dialing
Push & Hold to
Store/Step
piecal.com
EZ-CHECK™
All mA∙ Read V
TC
Source & Read mV
Hz
Source V
RTD • Ohms
OVERLOAD
4
1
+
+1