4-6
IM CA71-E
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 figure.
MEASURE
CA71
SOURCE
24 V 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.
4.2 Sourcing DC Voltage, DC Current or SINK Current Signal
