Re: HP 8644B Option 2 Upgrade
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I know that unit shares a lot with 8664/8665 units, and if the attenuator is the same, your attenuator cal ROM only has cal data up to ~1GHz. If memory serves me right, it's U32 on the backplane/IO board.
Nothing you can do about it without replacing the attenuator assy with a matching cal ROM, OR getting a copy of one from someone else....but it won't be for your attenuator assy. You MIGHT be able to use one from an 8664 or 8665 just to see if the error goes away.
Back yours up, though.... It is a EEPROM, so you can reuse it.
Colby
On Sat, Apr 13, 2019, 5:34 PM Mark Bielman < mbielman@...> wrote: Hello group. I have an 8644B (standard, upto 1030 MHz) that I wanted to upgrade to 2060 MHz. Managed to locate an upgrade kit w/cables (thanks Steve!) but after installing it I get the following error:
6,040,117. The "6,040" is the key here and the service manual says it's an attenuator problem. (?) The output attenuator is good (repaired and checked) and the doubler board has no attenuators, at least according to the manual.
I did notice that when the frequency goes above 1030 MHz (when the doubler kicks in) the output (mechanical) attenuator also clicks in. Seems odd unless it is adjusting for output levels from the doubler.
The output (when set to 0 dBm) drops about 1.5 dB when this happens.
The doubler board looks used as do the cables so that is most likely the issue, but no idea what to look at. The manual is a bit confusing, especially for HP.
If anyone has ideas, I would appreciate it!
Mark
PS - I have this unit for sale on ebay and was hoping to have option 002 as an added bonus, but perhaps not. :-(
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