Practical Instrument Electronics 434 - Manual (Page 7)

Practical Instrument Electronics
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Page 7
mA OUT, % OUT (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.
1) Disconnect one or both input wires from
the device to be calibrated.
2) Select “mA” or “% 4 to 20mA” with slide
switch q .
3) Select “SOURCE” using slide switch w .
4) Press and turn the knob r clockwise
several times until full scale output (24.000
mA/125.00%) is obtained. The display will
indicate
“PWR MEASURE”.
5) Connect the red source lead of the PIECAL
434 to the plus (+) input of the device and
the black source lead to the minus (-).
The PIECAL 434 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 PIECAL 434. Calibrate the transmitter
in the usual manner and disconnect the PIECAL 434. If Ground Leak Detection is enabled the
amount of milliamps leaking in the transmitter or loop is indicated on the display.
Power & Measure 2-Wire Transmitters
Typical
2-Wire
Transmitter
+ IN - REF +OUT-
Transmitter Input
Sensor
Process Signal
Simulated Input
Power 2 Wire Transmitters
Dial Output to FULL SCALE to
Power 2 Wire
Transmitters
DIAL
AUTOMATED DIAGNOSTIC CALIBRATOR
4-20 mA
Push & Hold to Store/Step
Push & Turn for Fast Dialing
Double Click for Options
VDC %mA
mA OFF
100%
0%
OUT
%
25.42