How to Measure a 4-20mA Circuit without Blowing Your Fuse
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- เผยแพร่เมื่อ 21 ก.ย. 2024
- The key to measuring a 4-20mA signal is realizing that it is a current signal so to measure it, your meter must become part of the loop.
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WAY more than half the meters out there have that fuse blown 😂
Probably so, they seem to blow them every week I run a training class 😂
Super important!!! I’ve seen so many people blow fuses. I have 6 fuses in my meter case, I started with 10 fuses. I’ve had 3 technicians blow fuses while I was there or have blown fuses in their meter.
Happens more often than people realize!
I always teach people that a multimeter becomes a “fused jumper wire” in amp measurement mode. This can be confirmed by measuring resistance or continuity of the test leads with another multimeter.
Once the person understands their meter is now a “jumper wire” (with a fuse in series with the test leads), i show them how to use the “jumper wire” to test/force +24vdc inputs to a PLC.
th-cam.com/video/EsbyXdg_dwk/w-d-xo.htmlsi=9Whf-r2bNiq5FRdB
We have bought a couple of our facilities A3004 Fluke meters because they are induction meters instead of contact meters.
Nice accessory
@@TimWilborne the safety man and bean counters like them for the ability to avoid contact with live terminals.
Plus you don't disrupt the process.
Very important tip. I hope i can remember.
Glad it was helpful!
100% sound like Fix-It-Felix. Not an insult.
😂
Yes please for some practical examples of how to use the process meter in the 4-20ma setting :D
Ok I will.
if you need to measure 4~20mA signals a lot you are better off getting a meter like the Brymen BM789. it has a special 4~20mA mode that translates the 4~20mA range into percent.
Aemc k110 clamp or the milwaukee amp clamp meter. I have a tendency to stick with probe accessories as you can't blow the meter fuses with those
Nice selections!
Awesome !!!! It Happens !
Yes it does!
When I'm reading small currents how come switching from the mA port to the A port shows widely different results?
It has to do with the resolution and accuracy on the different ranges. Take the 87V for example, if you look at page 48 of the following manual. On the 60mA range, the resolution is 0.01 mA. On the 10 amp range the resolution is 0.01 A or 10 mA meaning before you even consider accuracy, it is + or - 10mA.
dam-assets.fluke.com/s3fs-public/80v_____umeng0200.pdf?tKDGTic.KN0dP9_UJVtSyLsuYWEUp3SY
Plus the proper DMM fuse is $30 each but gotta buy proper one
Very true!
Why introduce a term that is not part of any industry standard I have run across? Series and parallel are the terms everyone has agreed on.
Which term did I introduce that you haven't ran across?