Martel Electronics DPC300A - Manual (Page 18)

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4.2 Measuring pressure with external modules
The calibrator has a digital interface for external pressure modules.
These modules are available for various ranges, including gauge,
vacuum, differential and absolute pressure. The modules work
seamlessly in conjunction with the calibrator. Simply plug them into
the interface and select [EXT] (external sensor). Since the interface
between the calibrator and the module is digital, the accuracy and
display resolution is dependent on the module.
REGULATOR
MAX 120 PSI
AIR SUPPLY
0-100 PSI
OUTPUT
-12-300 PSI
PUMP
-12-300 PSI
MEASURE
FINE ADJUST / VENT
PUMP
SELECTOR
MAIN
SELECTOR WARNING:
VENT BEFORE SELECTION
HOME
PUMP
ZERO
J1 J2 J3
COM
VOLTS /mA
SWITCH TEST +24v DC
PRESSURE
MODULE
F1 F2 F3
FILTER
CHARGE
PRESSURE VACUUM
P2
P3
P4
MARTEL ELECTRONICS
DPC-300A
P1 P2 P3 P4
Pressure Module
Adapter
Pressure Module
Valve
4.3 Measuring and sourcing current (4 ... 20 mA)
1. To measure current, use the input terminals on the front of the
calibrator. Select the mA function on the lower display. Current is
measured in mA and percentage of the measuring range. The
measuring range on the calibrator is set to 0 % at 4 mA and 100 %
at 20 mA.
Example
If the current measured is displayed as 75 %, then the value is 16
mA.
Note: The display will indicate "OL" when the measured
current exceeds the nominal range of current measurement
(24 mA).
2. The same connections are used for the current source. Select
mA-Source or mA Sim-2W from the configuration display.