Products > Test Equipment
HP 8904A Options
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davorin:
Is there a document about the commands used in the HP Service Note 8904A-05?

Like how to write 0xff into location 0x3ffc?

wn1fju:
I found the service note at:
http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/HP%208904A%20Service%20Notes%202.pdf

Or simply google "HP 8905A-05 Service Note".

Basically, what you want to do is follow the procedure as if you were going to change the three addresses at 3FFD, 3FFE and 3FFF, except you don't want to change those three - you want to use the up/down arrows to get to address 3FFC and then enter in FF for the data at that address.

You may have to fumble around or try a few times as I'm recalling all of this from years ago.  But I was ultimately successful and enabled Options 001/003/005.  Have fun.
davorin:
Well..with the up/down keys it was clear to me...but not how to enter the hex code...

So you say I can just move to 0x3ffc and try several times until I'm lucky and not mess up to end up with a dead device?

davorin:
Today a replacement ac inlet/filter arrived today...not a perfect match as it is larger but I made it fit by bending the pins (o;

Used a Schaffner FN9222B-3-06 now as it was the closest model available here in Switzerland.


Now for the option hacking (o;

davorin:
Wow...that was easy :-))

At the step where the technical note says "NEXT, NEXT, NEXT, f1, 4, 0, 0, 0"

then you actually set the start address...you could just press 3FFC....to switch over to enter the data itself...just press "f2" (it actually shows you on the display ;o) and then press twice "F"...then exit with twice "f4", power cycle the bastard et voila...options 01/03/05 are displayed :-))


--- Code: ---Power-Cycle/Power-On
SHIFT, SERVICE, SHIFT, f4, 0, 9, 2, 4, 4, 8, SHIFT, SERVICE
NEXT, NEXT, NEXT, f1, 3, F, F, C
f2, F, F, f4, f4
Power-Cycle

--- End code ---
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