How to measure transformer Voltage / Amperage?

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smilan

Well-known member
Joined
May 29, 2017
Messages
463
Hi,
How should I measure the specifications of a power transformer?
Should I measure the Voltage and Amperage with or without load?
 
Actually, you can't.

Well, you can guess-timate some parameters, but there is no real way of finding specs without doing like CJ and completely disassembling.

What you can guess about  is:

Weight to some degree tells you about VA rating

Secondary Voltage at no-load > is somewhat higher than at rated load. More over at small VA values than at large.

Secondary current can be guessed from wire dimensions, if visible

What you can't know:

- What primary voltage is supposed to be
- Rated secondary current

Jakob E.
 

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