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Re: HP8657B Mains Filter Disaster
Thanks for all the comments. I've actually ordered a new one from Digikey UK; bizarrely it's coming from the USA even though it's made in Switzerland and ordered from a UK company!!!! They had the
By NigelP · #95680 ·
Re: HP 70590A Information wanted part of HP 70000 / MMS
Hi Dave Thank you for your E mail from other E mails it appears this item is not supported by the normal 70900 local oscillators So only fit to stripe down for parts Could you post the clip on a site
By Paul Bicknell · #95679 ·
Re: HP 70590A Information wanted part of HP 70000 / MMS
I have the service manual and the CLIP for this module. Let me know if you have any specific questions. Thanks, David Slik VE7FIM wrote:
By David & Laura · #95678 ·
Re: E4401B No 50MHZ Cal signal
Hi Or treat yourself to a thermal imaging device i have found it to br very useful.
By Mainline · #95677 ·
Re: HP 8720D - Debugging story
One (1) is closed/on Regards, Stephen Hanselman Datagate Systems, LLC 3107 North Deer Run Road #24 Carson City, Nevada, 89701 (775) 882-5117 office (775) 720-6020 mobile
By Stephen Hanselman · #95676 ·
Re: HP 8720D - Debugging story
Since I can never tell what is 1 and what is 0 on these switches, here is a picture of the "Normal" setting for S400: I can't find any information on what positions 1-7 do. I do remember they have
By pianovt · #95674 ·
Re: HP 8720D - Debugging story
I think you have option 089, or at least some of the required hardware. I see an R-channel switch in your picture. It's that gold plated microcircuit between the wide rainbow-colored ribbon cable and
By pianovt · #95673 ·
Re: HP 8720D - Debugging story
Hi Vladan, Thanks for the thoughts on the options. How can I know if option 89 is available (hardware wise)? Being able to do mixer measurements (easily) would be really nice. I have no problem using
By Derek Kozel <derek@...> · #95672 ·
Re: HP 8720D - Debugging story
Derek, to me those pictures look like it's an option 007 + option 085 configuration (high power measurements).This means no bias-Ts, and it will be a bit of work to convert to 4-sampler. This option
By pianovt · #95671 ·
Re: E4401B No 50MHZ Cal signal
Plugged in a Tektronix 7000 series counter (7D15 to be exact), on an extender. It wasn't working. I had the room lights dim for whatever reason, hopefully to see anything that was unhappy. Everything
By Harvey White · #95670 ·
HP 8720D - Debugging story
Hello, I've just acquired an HP 8720D which was "working until one day it stopped". I tried turning it on and the machine started continuously rebooting every ~6 seconds. Nothing is ever displayed to
By Derek Kozel <derek@...> · #95669 ·
HP 8563A Revised design clips & service documentation
Hello, Apparently there are some early version A4 Log Amp/Cal Oscillator? and A5 IF Boards that were used in the 8563A Spectrum Analyzer.? I must have a later version and would like to know if there
By rpoz28cam · #95668 ·
Re: HP8657B Mains Filter Disaster
More about this common type of failure: https://www.eevblog.com/forum/repair/hp3458a-schaffner-mains-line-filter-failure/ I had one go off in a HP3457A. Took out 16 A line breaker, created a jet of
By Carsten Bormann · #95667 ·
Re: HP8657B Mains Filter Disaster
I would suggest *not* replacing with the original. Schafner filters are fine in the USA, but double the mains voltage, and they are stink bombs. I would not use a used or old filter as a replacement.
By Chuck Harris · #95666 ·
Re: HP8657B Mains Filter Disaster
Yes, totally normal behaviour! Problem is the filter caps are pre the power-switch/voltage selector and they just give up eventually. A lot of my equipment was bought in the USA so those caps have
By Adrian Nicol · #95665 ·
Re: HP8657B Mains Filter Disaster
Hi It is preferable to use a newly manufactured unit when in use in Europe, the voltage ratings of the filter capacitors has been raised. 73 George G6HIG
By george edmonds · #95664 ·
Re: HP8657B Mains Filter Disaster
Hi, that's, unfortunately, normal. They go up in smoke after some age. I believe (if you are brave) you can use the Equipment afterwards, normally they fail OC (at least mine have so far), but I would
By Martin Rickes · #95663 ·
Re: E4401B No 50MHZ Cal signal
All of this trouble due to a shorted 390 pF capacitor!
By Mark Bielman · #95662 ·
Re: HP8657B Mains Filter Disaster
RS Components sell them IIRC, but not dagger cheap! David Sent: 01 April 2019 14:47 To: [email protected] Subject: [HP-Agilent-Keysight-equipment] HP8657B Mains Filter Disaster
By David C. Partridge · #95661 ·
HP8657B Mains Filter Disaster
Had a disaster with the mains socket/filter/voltage selector on my 8657B yesterday. Wasn't even switched on and smoke suddenly poured out of the back; I initially assumed it was an electrolytic but
By NigelP · #95660 ·