Call me slow, but I've only just stumbled across this site-- http://www.hparchive.com/ Well worth a visit-if for nothing other than the old catalogs on line. ...
Hello all. I have a hp 3325A which comes up with Osc fail sometimes, the keyboard will not take decimal entries, ie 1.002,1.2 etc it will take whole numbers 1,...
... Check power supplies ... Clean the front panel switches, check cables and connectors. ... John ... [Non-text portions of this message have been removed]...
I was getting an "OSC FAIL" message on my 3325A and it turned out to be a problem with the VCO. One of the caps had gone bad and caused the DC bias levels to...
If you find one let me know! I scored some pressure sensitive paper of the correct size some time back but it isn't too good at taking ink- yet to figure out...
... Thanks Stuart (and others). I'm Glenn Robb, an HP aficionado and creator of www.hparchive.com I was going to keep this site under wraps for a few more...
That is great to hear, Glenn. I have access to a ridiculously-fast duplex scanner, so if you don't mind having the spines cut off of your catalogs, I can...
Hi Dave, The manual describes option 18 which are "disposable pen tips" that are described as either fiber (sic) or disposable capillary tips. I don't think ...
Hi, I recently acquired an 8660C that exhibits sharp noise sidebands at approximately 2MHz spacing each side of the fundamental frequency and 40dB down. This...
... The 4951, 4953 and 4955 Protocol Analyzers were quite powerful serial-data analysis tools. The 4955 has, if I recall correctly, two CPU's, one for data...
Dave: Thanks for your encouragement. Right now, I have no formal approvals for re-publishing old copyrighted HP materials. If you (or any other list member)...
Dear Group, I am not a cheapskate but I just received several new small sample boxes of Panasonic miniature aluminum electrolyic caps manufactered around early...
Although I have not seen the actual problem you describe, it is not an uncommon occurrence in general terms. Look for noisy transistors in the mainframe loops,...
I recently threw out all my "junke box" electrolytics. New and better components are available at good prices. Using NOS capacitors isn't worth the risk. That...
The factory approved technique for bring up a newly made electrolytic was to apply full working voltage through a 1.5K resistor. I find that it works nicely...
Thanks Chuck, So do you think it makes any sense for me to keep 10yo boxes of new small lytics like the Panasonic miniatures? 73 Jerry K1JOS CCA #1713 ... ...
... You might as well keep them as compared with thowing them out - but new general-purpose electrolytics are so darned cheap I personally just buy them as...
... I did some exploratory surgery on the 4955A and its main CPU is the same custom 16-bit hybrid microprocessor that was developed for the 9825 desktop series...
... That may be a GPIB controller chip (TMS9914?). Sounds like the same main CPU as what was used in the 8568A/8566A. Pretty exotic chip for the late 1970s. ...
Out of interest the ROHS directive for Europe has Cadmium as one of the hazardous substances. Presumably this will mean the end of Ni-Cads. I really need to...
Has anyone had any luck getting the HP8970A to work with Softplot? The HP8970B is supported and you should be able to get automated noise and gain sweeps. So...
Hi, I am looking for the schematic of the HP 6234A dual output power supply. The one I have has no current limit on one output and obvious signs of overheating...
NiCad are becoming hard to find, even more so when you want the tabbed style. If you have room in the equipment, you can buy a 4 pack holder at Radio Shack and...
I just parted out a 3498A extender for parts because I needed the case for a project. I got the unit in a large lot- it had been tossed because it wouldn't...
... <conrad@...> wrote: "...Has anyone had any luck getting the HP8970A to work with Softplot? The HP8970B is supported and you should be able to get automated...
... From: "Morris Odell" ... I agree, but to my antipodean colonial eye there's something missing from that rack to the right of the bench. Any takers? Morris...
