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Need opinion RE HP/Agilent 6623A power supply

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free_electron:
you got the SMD version of the GPIB controlle.r mine are older and the controller is thru-hole. You also have the 'pcb' version meaning there are no hybrid modules. there is a pcb coming up along the heatsink going to discrete transistors. mine have hybrids. those are unobtainium when yu fry them ( although they are very hard to kill )

casinada:
The Agilent 6627A has the New GPIB board. The 6624A has the old type GPIB board with Jumpers (first picture). The second picture is the Hybrid Chip, a $46 part from Agilent. The third picture is the Leaky $45 capacitor and its replacement. I really wanted to get the original part :( I tried to solder the replacement capacitor to the original base but I was unsuccessful. I guess I'm not a good alchemist.

Dago:

--- Quote from: member_xyz on November 05, 2012, 10:58:01 am ---Thanks guys for valuable and informative feedback.

Dago, you have an interesting USB/GPIB interface adapter. Have you considered including/adding rotary encoders  as free electron has suggested ? You may be able to expand it further by adding a display  and turning it into a stand alone remote control unit, as well as USB interface to a PC?

--- End quote ---

The board has a header with GPIO that can be used for rotary encoders (and this was the reason why I put the header in there in the first place :)) and the board has an UART header that could be connected to an auxiliary board which has a display. Still need to work on the software.

member_xyz:

--- Quote from: Dago on November 07, 2012, 05:39:25 pm ---
--- Quote from: member_xyz on November 05, 2012, 10:58:01 am ---Thanks guys for valuable and informative feedback.

Dago, you have an interesting USB/GPIB interface adapter. Have you considered including/adding rotary encoders  as free electron has suggested ? You may be able to expand it further by adding a display  and turning it into a stand alone remote control unit, as well as USB interface to a PC?

--- End quote ---

The board has a header with GPIO that can be used for rotary encoders (and this was the reason why I put the header in there in the first place :)) and the board has an UART header that could be connected to an auxiliary board which has a display. Still need to work on the software.

--- End quote ---

Please keep us posted on the progress of GPIO board.
I am now looking for one possibly two 662XA power supplies with multiple outputs. Damn things are very heavy and shipping cost is usually higher than the units themselves.

Ordinaryman1971:
I have a question about HP 6623A, I have one that reports error: No model number.
I can't toggle between channels, the first channel outputs something but it's about half of the set voltage.
I was trying to switch channels but it still reports the same and acts the same regardless of which channel I connect to the first connector.
I have another one "for parts" unit but the GPIB board is older, thru hole when the original pcb is smd.
When I've replaced the smd board with the thru hole one, the power supply's LCD screen stops working.
That's the extend of testing I've done so far.

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