I believe that sticker is a one size fits all type, nothing else makes sense. When I look at how other people wired theirs (via reviews), mine was also wired correctly. There are two adjustment screws on the board for calibration however the indicated values correspond with my multimeter.I provided a link to the spec sheet for the supply including its protection mechanisms. You tested the voltage condition and I very much doubt there's a temperature fault. So it's clearly not behaving correctly. Hopefully Jameco will exchange it.
Yes but note in your image
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V+ comes from the PSU driving the load (the annealer). Just make sure the volt/ammeter can handle a 48V supply. (In all other respects it is wired as other meters of this type. The return from the load is passed across the shunt. The ammeter measures the voltage drop across the shunt (thin wires shunt to com and Ain) and from that deduces the current given the resistance of the shunt is known.) V+ still needs to come from somewhere. The diagram on the right has it coming from the load PSU. The boxes on the left - which aren't checked - reference either an 8-18V V+ range or a 3.5-30V V+ range. Note also the message "please use isolated power to supply the meter". I don't think this is the source of your PSU issue but check the ammeter specs to ensure it can handle 48V as it's power source V+ (quite separately it may measure a wider range than its applicable supply range).
From Drok
“Three terminals DROK volts amp tester is equipped with three terminals. The power supply is taken from the test loop. No additional power supply is required.”
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