Markus' Blog

Adding Front Panel Binding Posts to HP6632B Power Supplies

by on Sep.28, 2014, under Electronics

Front Panel Binding Posts

Front Panel Binding Posts

HP/Agilent has built some very good power supplies like the HP6632B (0..20V 0..5A). From time to time you can score one of these beefy devices in used condition for little money on eBay for example. However most of the time they do not have front panel connectors installed. That is because they are often installed in a rack, hard wired to some other equipment using the back panel connectors.

Dave Jones has posted a video to his blog, where he upgrades his 6643A (very similar construction to the HP6632B) with binding posts.

I have done a similar hack about a year ago. All the outputs from the rear are wired to the front.

Rear panel connectors

Rear panel connectors

At the rear there is a gap above the connector which comes handy for running the cables inside. At the inside of the front I have added a strong sheet of plastic, because – as can be seen in Dave’s video – the original front panel cutouts are too large for ordinary binding post connectors.

Internal construction started

Internal construction started

At the front panel there are now 5 connectors: +, -, Sense +, Sense – and mains earth. Also there is a little switch, that either shorts the sense wires to the output connectors or leaves them unconnected. So I can easily switch between the internal voltage feedback loop or an external feedback connection for higher loads and increased voltage stability.

Internal construction finished

Internal construction finished

I wanted to have a decent look at the front panel, so I designed a custom label for the new connectors. It is designed as 10cm x 15cm photo, so it can easily be printed in very good quality using your local photo dealer (you just have to play around with scaling and contrast to match the output to the actual device).

Front panel label as 10x15 photo print

Front panel label as 10×15 photo print

 

Construction started

Construction started

 

Meanwhile I have hacked two 6632Bs and once again I am very happy with the result 🙂

Finished front

Finished front

 

 

 

 

 

 

 

 

Two modified HP6632Bs

Two modified HP6632Bs


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