Products > Test Equipment

Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)

<< < (86/91) > >>

m k:
You can quite easily trace _reset backwards but you most likely need an extender board.

SilverSolder has all kind of exotic extras, maybe he can spare an extender.

If you find one I'll probably need it after you so don't let it go.

SilverSolder:

--- Quote from: Neptuni on November 12, 2021, 08:05:00 pm ---Hi folks,

I now have a 8506A and a 8505A kind of working.
The 8505 with RMS, ohms and current, the 8506 with ohms. Both instruments with GPIB.
I also bought some spare cards for the future.
The 8505 has software version 5.01 and the 8506 has 6.05
Both instruments have the same issue, the reset procedure at boot restarts continously. If I press and hold the reset button on the frontpanel the instruments will come out of the reset cycle and work normaly.
I have started to recap the instruments, but still work to do.

Mikael, Sweden

--- End quote ---

I have seen those kinds of issues (weird behaviour, or outright refusal to boot) when the EPROM is "weak", i.e. made by a programmer that is not up to the task.  Maybe as a first experiment, try to re-seat the EPROMs on the processor board...

The latest known firmware releases are 5.0.6 for the 8505A,  and 6.0.7 for the 8506A.


1audio:
Does the eprom have firmware or just the cal constants? I have 2 8506A's now and I'm wondering if I should replace the eproms as a preventative.

SilverSolder:

--- Quote from: 1audio on November 14, 2021, 06:32:39 am ---Does the eprom have firmware or just the cal constants? I have 2 8506A's now and I'm wondering if I should replace the eproms as a preventative.

--- End quote ---

The EEPROM only has cal constants.  The firmware is in a separate pair of EPROMs.

Neptuni:
Hi,

The 8505 is ok now after removing and insertion of the IEEE and isolator card.
The 8506 is still rebooting…

Are there someone who could assist burning two sets of EPROM (for my 8505A and 8506A), it would be nice to have the latest firmware in my instruments, but I dont have access to equipment? I would if course pay for expensises and shipping.

Mikael

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod