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Re: HP 8643A IO board fault
Maybe not - I don't find anything getting hot. However, the -15V rail is MIA from the near end of R41, which has gone open. Dead short to ground on the -15V rail, I guess that's my problem :). It's
By Sigur?ur ?sgeirsson · #92228 ·
Re: HP 8643A IO board fault
Ok, that is good. I find them to be very useful for these kinds of problems. Also, you might try unplugging modules as you monitor the current. Something is dragging it down. I live in Forest Hill,
By tmillermdems <tmiller11147@...> · #92227 ·
Re: HP 8643A IO board fault
I forgot to mention that I have two LED error indicators lit on the IO board, looks like they're designated LED_BUS(5) and LED_BUS(6). I haven't seen any mention of those in the service manual, so I
By Sigur?ur ?sgeirsson · #92226 ·
Re: HP 8643A IO board fault
Hey Tom, thanks for your kind offer, but I think I can snarf one from work. To answer your question, though, I'm in the frozen tundra of Montreal, Quebec. Are you nearby? Siggi
By Sigur?ur ?sgeirsson · #92225 ·
Re: HP 8657D signal Generator
I have an 8657B and it's great so I would say go for it, at that price you can't go far wrong. Let me know if you don't want it and I'll be down to collect it like a shot - mother-in-law lives in
By Adrian Nicol · #92224 ·
Re: HP 8643A IO board fault
Hi Siggi, Where are you located? I have an IR camera. Regards
By tmillermdems <tmiller11147@...> · #92223 ·
HP 8643A IO board fault
Hey y'all, I turned on my HP 8643A the other day, and it came up with an error code 15.022.116, which implicates the I/O board. This finally motivated me to pull it down from the rack and replace it
By Sigur?ur ?sgeirsson · #92222 ·
Re: HP 8657D signal Generator
Yes, the 8757D it¡¯s a very good replacement for 8656A. The 8657D is very similar or identical to an 8657B but limited to 1040 MHz with option TT/4 DQPK (2 rear connectors) . Resolution 1Hz, better
By Yves Tardif · #92221 ·
HP 8657D signal Generator
Dear All.I have just seen the following HP Signal Generator for sale in the UK at a very reasonable price:HP 8657D TT/4 DQPSK Signal Generator. Would this item be a suitable replacement for my faulty
By KEN WRIGHT · #92220 ·
Re: HP8663A Power supply, was: Firmware difference
Small update I have now ordered 4 Mean Well AC/DC power supplies. - HRP-75-5 5V 15A 75W - LRS-50-12 12V 4.2A 50W - LRS-50-24 24V 2.2A 50W - RS-25-48 48V 0,57A 36W While I'm waiting for these to
By Askild · #92219 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
That symptom tells me that the DC isn't turned on, and you are simply seeing bleedthrough from the ext reference to the reference output connector. Back when I taught EE, that was one of the biggest
By Chuck Harris · #92218 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
The relay is chassis mounted, and plugs into a connector. It is clear plastic, and the cover comes off easily. Take it apart, blow out the dust/rust, and perhaps give the solenoid coil pole piece a
By Chuck Harris · #92217 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
There's an eBay seller who currently has a few 05370-xxxxx circuit boards for sale.? Although not listed, it might be worthwhile to ask him if he also has the front red plastic display and a display
By Matt Corbett · #92216 ·
Re: E4419 calibration?
Shipping cost is small compared to the price of calibration. Looking at the Keysight site if I went to them the cost of calibration for the setup far exceeds what I paid for those items. I did compare
By Peter Gottlieb · #92214 ·
Re: HP3763A Error Detector to the boneyard??
Well, suit yourself, it's your gear...but I do love those little units and I certainly don't mind a repair project if you change your mind. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
By Dave McGuire · #92213 ·
Re: 8566/8568 interconnect cable HSWP?
Thanks for the info.? Has anyone contemplated using the spare BNC hole(s), on the back of the 85662A display, to provide the HSWP connection?? Mount a BNC jack and then run a shielded wire to the
By Matt Corbett · #92212 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
drkirkby@...> wrote: I should have added, it fails to work either on an internal or external reference. But the fact that I can only get -70 dBm out of the output with +10 dBm in,
By Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> · #92211 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
The issue does seem to be related to the reference in some way. 1) Put it on internal reference, and there's nothing coming out of the reference output, and the unit does not work 2) Put it on
By Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...> · #92210 ·
Re: E4419 calibration?
I was curious and looked at the 438A manual and the power reference is specified to be +/- 1.2% worst case after being set at the factory and there is a test for it in the service manual. The Cal Lab
By Mark Goldberg · #92209 ·
Re: Looking for a front red plastic display on HP 5370B time-interval counter.
I saw the picture, but figured it was worth mentioning anyway - could have been disturbed during packing.
By Orin Eman · #92208 ·