Steve Bailey
Lifetime Supporting Member + Moderator
Include a DIN rail mounted fuse holder in the analog circuit. When you need to measure loop current, put the meter on the fuse terminals and then pull open the fuseholder. Now the meter is in the circuit and you haven't disrupted the process. Just make sure the meter is firmly attached and to close the fuseholder once you've recorded the measurement.Long story short, some of our electricians struggle when asked to measure loops.