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"Jared Cabot via groups.io" <jaredcabot@...> writes: The interesting thing was that it wasn't even noticable when turning the pot. It was just open when the unit was cold, and

Hi I'm trying to read the list of stepped frequency points for the current (corrected) trace on an HP 8510C via HP-IB. I *think* OUTPFREL is supposed to accomplish this, but I see the message:

Hi Marco, The scope bezel does come off, but because of age the plastic will have become brittle, so you do have to be careful. There are two tabs on the bezel which lock it into a metal surround on

Does anyone have access to service information and/or schematics for any of these microwave sources and down-converters? As far as I can tell HP/Agilent never released any service info on any of these

I found the same in the 1345 displays in both my 4145A and 4145B, more than one of those little Bourns 3329-series trimpots were problematic. Jared

I have a spare boot floppy for the 4145A, can make a copy on a new floppy disk for the 4145B, and have a set of Agilent floppies in a sealed box for the 4155B/4156B (Kit# 04155-85022, containing P/N:

Most common failure in 1345 is one (or more) of the trimpots lost connection in one of terminals. Those small Bourns round trimpots are a real disaster. I had at least a couple of dozens of those

"Sven Schnelle" <svens@...> writes: Might be just the gain pot - it says 1k, but i measure 1.6k. I put a fixed 270Ohm resistor now because i don't have the right pot, lets see whether that

Hi List, i couldn't resist and bought a lot of HP Semiconductor Analyzers. In particular: HP4145A HP4145B HP4155B HP4156A The HP4145A + B are likely easy repairs, on one the 1345 XY display sometimes

"Sven Schnelle" <svens@...> writes: I did another test now: unsolder the tuning coils from the PCB and connect it to voltage source. Moving current from 0 to 50mA (i think i've read

"Bruce" <bruce@...> writes: I think i checked both a while ago, but will check again this evening. Thanks!

Hi Wayne, "Wayne ZL2BKC" <w.knowles@...> writes: I think i measured ~2.3V above the coil, but don't know what the voltage

Hi Peter, I humbly apologize for my silence but I had no time to attend the group and accordingly, I completely missed your message. Thank you so much for your offer!! I live in Italy: do you think

...and the discussion gets just about as heated! oops, I mean ...and the discussion gets just about as heated!

What others have said. Please check the type of EEPROM. They can be programmed in different ways.

Hi all, Thanks again for great advice on my thread about spectrum analyzers. I'm looking to expand my capabilities with one or more signal generators. I'm mostly interested in pulse modulation and

Sven, The graph you included showing the insertion loss for band 0 now has me thinking.?? The slope you measure is almost identical to what I witness against my faulty unit (with a falloff from ~1

I did recap the PS with high grade caps . I'll double check those rails and dig into it and see if I can get a part number for U21.

It's interesting that it's so intermittent. Have you verified that the instrument's power supplies are stable? What type of EEPROM is U21? (chip part number) Do you know offhand what's stored in it?

I'm getting a error code of 1310 upon turning the SA on. It's indicating eeprom u21. There is some hand writing in the manual (looks like corrections to the manual) that if you get that error code