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by itm60
Sat Aug 21, 2021 10:14 am
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Thanks for the feedback. The multimeter is still working fine (i.e. the fuse has not blown) - I can still test other (AC/DC) power supplies with it and get normal readings. It's just these two AC/AC transformers that I can't get a reading from. I have always been extremely careful about selecting th...
by itm60
Fri Aug 20, 2021 11:33 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

...seems to be confirmed in the "Overload" section on this page:
https://learn.sparkfun.com/tutorials/ho ... of%2Drange.
by itm60
Fri Aug 20, 2021 11:31 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Can that be right? I can only go by what facts you have said. I'm connecting the output cables of the transformers directly to a multimeter, and setting the multimeter to AC/15V Even though you know it is a 24v output transformer. In the past if I have set my multimeter to a lower range than the tr...
by itm60
Fri Aug 20, 2021 11:13 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Can that be right? In the past if I have set my multimeter to a lower range than the transformer is delivering the reading simply goes off the scale in the multimeter - it hasn't done any damage to the transformer. I have done this many times
????
by itm60
Fri Aug 20, 2021 6:23 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Oh and the 13 amp socket is fine - I plugged another transformer into the same socket and it tested fine. I also did a continuity test on the fuse in the plug that I'm using and it was fine.
by itm60
Fri Aug 20, 2021 6:22 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Thanks for your reply. The resistance reading for the input side (i.e. the 240V cables is 0.L (the letter L).
The resistance for the output side is 0.6
by itm60
Fri Aug 20, 2021 8:20 am
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

The meter is fine - it reports correct voltage on a different ac/DC transformer
by itm60
Thu Aug 19, 2021 9:12 am
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

Re: How to test an AC/AC doorbell transformer?

Also set meter to 60V but zero reading
by itm60
Wed Aug 18, 2021 3:04 pm
Forum: Electrics Forum
Topic: How to test an AC/AC doorbell transformer?
Replies: 16
Views: 3066

How to test an AC/AC doorbell transformer?

I've had two brand new AC/AC transformers delivered to me in the last week, one from Amazon and one from CPC Farnell, and neither of them seem to work. So now I'm beginning to wonder if there is a problem with the way that I'm trying to test them. I'm connecting the output cables of the transformers...
by itm60
Sat Aug 14, 2021 11:39 am
Forum: Electrics Forum
Topic: How to wire 2 "smart" doorbells to the same chime?
Replies: 1
Views: 1601

How to wire 2 "smart" doorbells to the same chime?

I have a Siemens Gigaset HC450 door intercom, installed with a Friedland D107 chime. The Siemens Control Unit is powered by a 12VAC 1A transformer, and the chime by an 8V 1A transformer. I also have an Ezviz Smart Video Doorbell, powered by a 12VAC 1A transformer. I was wondering if it would be poss...
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