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10A socket is for current measurement. It has a very low internal impedance.
If you tried this one first, two things may have happened:
- If your power supply can deliver much more than 10A, the meter internal fuse may be blown by now
- If your power supply is not short-circuit protected, by connecting it to 10A socket you effectively shorted the power supply output, and eventually blew it.
And, there is a chance that meter was already faulty..
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