I took apart the failed attenuator assembly. The failure root cause was just dirty contacts. I was able to clean the contacts using electrical contact...
Hi: RMB is a great language for instrument control. AFAICR there was a correlation between the version number and the type of floppy drive you needed to load...
There is this link with software to a variant of 6.2: http://www.hpmuseum.net/display_item.php?sw=405 Though I have no knowledge if it is usable on anything...
I have an 8720C with Opt. 006 from the factory. The solid-state transfer switch does not function any more. I replaced it with a compatible mechanical switch...
I have been going through a checkout of my new 8566B and so far most everything is pretty close except for two things: First, the oscillator was quite high....
Are you sure you're looking at the fundamental frequency from the calibrator? The 8566B can sometimes be flakey when using the automatic search mode, and may...
Patrick, Nice job keeping the group informaed - this will be invaluable information to folks who purchase one of these fine instruments that needs some work! ...
Yes, absolutely it is tuned to 100 MHz and at the peak. The problem is not adjustment range, it is that the level displayed (and measured) depends on where...
I am actually looking for either one. I found the transistor for $10.00 each at Nebraska Surplus. The thing is, I really don't know what else might have been...
I have 2 or 3 of these. Out of production for years and no other manufacturers. Used in a lot of 80's HP 8656A/B,et al. and often fail now and units parted...
Normally it should be pretty good after 20 minutes from cold start. If it took hours to "settle," that could be how long it takes the internal temperature of...
It sure sounds like a bad oven. It might be a good idea to pull it out (from the bottom) and test it. Make sure there is power to the heater. Tom ... From: Ed...
Peter, can you substitute your rb reference for the internal reference? Just to see if it stabilizes faster? Or instantly? Might help determine something. 73...
Sorry, I have 08640-90186. My change package covers 1810A through 2031A, so I guess my material is roughly equivalent to 08640-90197. As Dave H. said, it's...
Since the amplitude display is a scaled representation of a logarithmic process, there are two adjustments needed - a gain to set the spacing of the 10 dB...
I had the same fault on a 1741A, R26 (18.2K) and R11 (47.5K) were o/c, but no dead transistors. These scopes are plagued by bad joints on the white mulipin...
The unit had sat in my car at about 0 C for hours before I brought it inside. At first, the frequency moved pretty quickly but then slowed down as the...
... It is quite simple if the log amps are working right. Peter needs to do the log fidelity test, then go through the cal procedure. First I'd check the...
Thanks for the info. The board with the white square is going to stay right where it is. I am working on the Horizontal sweep board. The one transistor and the...
Can't help with the wire, but if anyone needs any new rubber grommets for the attenuator, I have a number of new ones. Mine turned to rock and disinigrated. ...
Prelude: Oven warm, was right on and rock solid after instrument in standby for a day. IF section power supplies within tolerance, no adjustment needed (well, ...
Thank you for your comment about the log amp boards being a matched set. I looked into this further and found where the manual says they are factory matched...
A few months ago someone told me that there was a "kit" one could buy to refurbish these rubber membrane switches. I should have kept the email in a safe...
... Bob, you can buy a two part mixture for re-furbishing these switches. I have done it on a Fluke signal generator and several TV type remotes with success....
This is a normal everyday issue with telephones in the business world. The membrane has black carbon dots glued to it. There is a coating that can be placed...
... I'll be interested to hear what you find. Could you let us know the part numbers of the log amp boards and the values of the resistors that feed the log...
Yahoo trouble posting again, it is bouncing ALL my replies, having to log in to Yahoo directly to post. My settings look fine (Why does Yahoo suck so bad?) ...
