Hi all,

I am using a string-potentiometer with a 2 wire 4-20mA output with a DT85. I have wired it up in the "C3-Independent current using internal shunt and external excitation" way and the channel definition is 9#L(E).

For the external power I have actually put a jumper 12V output and GND terminals to the EXT* and EXT# terminals on the DT85 and set 1SSPWR=1. This seems to work fine.

I just want to know if there is a way to do this internally with a channel option or whether I am breaking any rules by doing this?

Cheers,
Simon

Good morning Simon,

The power on the digital section is deliberately not connected to the analog section. If we did it would break the isolation between the analog and digital sections.

In this case it is OK to connect the two together but there are a number of other situations where this would be less than ideal.

Cheers,
Roger