4-6
IM CA150E
4.3.3 20 mA SINK Function
The SINK function allows you to use DC current (DCA) with the polarity
set to - (minus). This allows drawing (SINK) the specied value of
the current from an external voltage source (distributor, etc.) in
the direction of the H terminal. Thus, you can use the instrument in a loop test,
for example, as a simulator for two-wire transmitters.
Use the external power supply of 20 mA SINK within the 5 to 28 V range.
Set the polarity of the applied voltage as shown in the gure below and
take care not apply a voltage in the opposite direction.
MEASURE
CA150
SOURCE
24V DC
AC or DC
power supply
Output 1-5 V
4-20 mA
+
-
Distributor
H L mA H L
1 Use the FUNCTION key on the SOURCE side to align
the source mark with DCA. (DC current selection)
2 Use the RANGE key to select the 20 mA range.
(-22.000 mA to 22.000 mA)
3 Use the ▲ ▼ output value setting keys to set each digit output value.
Each ▲ ▼ key corresponds to a digit of the setting value.
Each time a key is pressed the value is incremented or decremented by
one count. If you attempt to increment or decrement
the value 9 or 0, the digit moves up or down one place.
A value continues to change when you hold down the key.
Press the CLEAR key to restore the setting to its initial value (zero).
4 Use the + ← → - key to set the polarity to minus.
5 Connect the terminals as shown in the gure above.
6 Turn on the power of the external voltage source (distributor).
Press the SOURCE ON/OFF key to start generation.
(SOURCE OFF changes to ON.)
7 Press the SOURCE ON/OFF key again to turn off the output.
(OFF lights and the output terminals are open-circuited.)
Tip
The I/O signals of the distributor can be checked by connecting the terminals
as indicated by the dashed line in the gure above.
4.3 Source DC Current (DCA) Signals
To Next Page
Loading...
Need help?
General
