Quote:
Originally Posted by SiriusHardware
The sense-in terminals aren't used as part of the voltage regulation loop in these Thurlby-Thandar power supplies
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Double-checking the schematics, I'm pretty sure that's not correct.
The negative sense terminal is connected straight to the two voltage adjust pots as well as the metering.
The positive sense terminal is connected to the control circuit ground, which is where everything is referenced from.
The simplified diagrams earlier in the manual confirm this.
I agree that adding a pair of resistors to join the force and sense terminals is a good plan, and might well go as low as 10 ohms.
I also checked this is true for the later PIC-based version. In that model, they've done away with the diodes between force and sense, and replaced them with 2k2 resistors. Seems high, but the sense current is much reduced with this version.