Salas DCG3 preamp (line & headphone)

To create symmetrical voltage from bench PSU you select series mode. The master channel settings are mirrored. The user's manual explains which output posts to connect as +/- and midpoint.

I am not sure on what exactly you want to test though. Please elaborate.
 
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Alright. That's a valid way to test PSUs when without transformers. AC rectification section is being skipped. You should connect the incoming DC at suitable points after the bridge diodes.
When having transformers the simplest current limiting device is a good old dim bulb tester between them and the mains.
 
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You set 25V and what current limit you prefer on CH1, you select Series on the black buttons, you connect Master + to DCSTB F1, Master COM to DCSTB CT, Slave - to DCSTB F2, you press the green button ON
 
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