Practical Instrument Electronics 334 - Manual (Page 3)

mA OUT, % OUT (Percent of 4 to 20 mA)
Choose this function to provide an output from 0.00 to 24.00 milliamps. The compliance voltage is a
nominal 24 VDC to provide the driving power to your milliamp receivers.
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) Connect the output leads of the PIECAL
Model 334 to the inputs of the device
being calibrated, making sure to check
polarity. Red lead to the plus (+) input
and black lead to the minus (-) input.
The output is adjusted by turning knob r
while the EZ-CHECK™ switch e is in the
“DIAL” position, or the current can be set
at the fixed points of 4.00mA (0.0%) or
20.00mA (100.0%) with switch
e .
READ mA, READ % (Percent of 4 to 20 mA)
Choose this function to measure from 0.00 to +52.00 milliamps or -25.0 to 300.0%.
1) Open the current loop at any conve-
nient point along the signal path.
2) Select “mA” or “% 4 to 20mA” with
slide switch q .
3) Select “Read” using slide switch w .
4) Connect the red input lead (+) of the
PIECAL Model 334 to the more posi-
tive point of the break and the black
input.
Signals below 0 mA or open circuits are
indicated by 0.00 mA (-25.0%) on the
display. Signals above 52 mA are current
limited by protection circuitry.
Sourcing Milliamps
Reading Milliamp Outputs
OUT
Milliamp Receiver Input
Controller
Transmitter
Computer
Logger
I/P
DCS
READ
Milliamp Output Signal
Controller
Transmitter
P/I
DCS
4.00
Practical Instrument Electronics
82 East Main Street Suite 3.14 • Webster, NY 14580 Tel: 585.872.9350 • Fax: 585.872.2638 • [email protected] • www.piecal.com