Ametek Thermox 2000 ATEX Series User Manual page 199

Modulation of External Power Loop Using Current Outputs
Figure C-1.
Modulation of external
power supply.
Figure C-1 shows an example of the connection method when you want to
produce a modulated current loop from an external power supply and a
load device. All current output channels (IOUT1 and IOUT2) can be con-
nected in the same manner as shown in this figure.
IOUT1 and IOUT2 must share the same power supply if both of these
channels are used, or two power supplies can be "ORed" together using a
diode from each power supply positive terminal (diode anode to power
supply) to the VEXT1,2+ terminal. The power supply minuses would be
tied together and connected to one side of the both loads. The other side of
one of the loads would be connected to IOUT1+ terminal, and the other
side of the other load would be connected to the IOUT2+ terminal.
For each current output channel used in a current loop modulation
application, the jumpers should be removed for that channel.
OPTIONAL OPTIONAL OPTIONAL
OPTIONAL OPTIONAL
Current Outputs: Other Applications | C-3