IM CA71-E
4-5
Source
4
4.2 Sourcing DC Voltage, DC Current or SINK Current Signal
4.2.3 20 mA SINK Function
The 20 mA SINK function can draw a preset amount of current from
an external voltage source to the H terminal. Thus, you can use the
calibrator in a loop test, for example, as a simulator for two-wire
transmitters. In that case, use this function within the 5 to 28 V range
of applied voltages. The minimum value of the range for the 20 mA
SINK function is 0.1 mA. You can test the I/O signals of a distributor
by wiring the calibrator as indicated by the dashed lines in the
following gure.
MEASURE
CA71
SOURCE
24V DC
AC or DC power supply
1-5 V output
4-20 mA
Distributor
H L mA H L
Drawing SINK Current
Step 1: Before connecting to the terminals, select
with the
source range setting rotary switch.
Step 2: Connect the positive terminal of an external power source
to the H output terminal and the negative terminal to the L
output terminal.
Step 3: Turn on the external power source and press the
key.
The indicator on the LCD changes from to .
The calibrator sources the preset current value of the
20 mA SINK function between the output terminals.
Step 4: To turn off the output, press the
key once again.
The appears on the LCD and the output terminals are
open-circuited.
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