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Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
Have both 8660B and 8660C; I was aware of the thermal issues with the 8660B (I believe it was in the pre-LSTTL era as I understand). It lives in a basement (lowest floor) workshop and fortunately is
By David Feldman · #151002 ·
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
After doing some testing yesterday, I discovered that the 8481A that was to be the recipient of the dead 8485A's connector etc. assembly was itself dead (8481A won't zero and responds about 20 dB down
By David Feldman · #151001 ·
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
I think it is likely to work - BUT, the assembly and disassembly will be (at lest) challenging. The thermistors may be similar, and possibly the thermistor board in the cartridge (you need to check
By Bruce · #151000 ·
Re: 33210A load waveform over Ethernet
Hi Peter, I don’t have 33210A, but it’s same thing with an 33220A. I used the free Agilent IntuiLink Waveform Editor software. In the File Properties menu, I chose the number of points;
By Yves Tardif · #150999 ·
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
If it is from a 8660, don't be tempted to go with a lower power fan, HP had some reliability problems with early 8660A & 8660B, this lead to them offering a free upgrade to a larger size fan in 1974
By factory · #150998 ·
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
Robert, Adrian - thank you both for adding to discussion - this information helps because I also have OPT 003 in old HP 8660 series synthesizer (also very heavy machine) so good to have these
By David Feldman · #150997 ·
33210A load waveform over Ethernet
Just wondering if anyone has experience loading a one-shot retriggerable waveform over Ethernet into a 33210A arbitrary waveform generator. I'd love to hear the Reader's Digest version of how I can
By Peter Gottlieb · #150996 ·
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
The difference with the option 003 is that a *DC* fan is fitted rather than the mains (50/60 Hz) AC one in the standard unit. This give you more choice of replacment fan. Take the old one out and see
By Robert G8RPI · #150995 ·
Re: How to recover the video of my graphic 54810-66505 card
hello, Does anyone have the schematic of card 54810-66505? (Video pci card) This prevents the motherboard from starting up. The same with other motherboard thank you
By Gerard · #150994 ·
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?
What is the problem with it? I had a very noisy one of these fans and any 400Hz capable replacement was very expensive. In the end I simply took the old one apart and replaced the two bearings. They
By Adrian Nicol · #150993 ·
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
"F1EKU via groups.io" <rfconsulting.fr@...> writes: I can confirm that. Last week i tried to do flatness calibration on my 83752A sweeper. As i only have a 8485D that accepts a max
By Sven Schnelle · #150992 ·
Re: A homemade diode power sensor for HP meters
Hi Jeff: Isn't this a years old thread? Did this home brew power sensor project go anywhere, in the mean time?
By Roy Thistle · #150991 ·
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
Thank you for detail understanding!
By David Feldman · #150990 ·
Re: looking for service manual for HP4934A
Dave, Maybe its the about the same inside?? Please upload it to the files area. I will download and take a look at it. Thanks -- 73s Brian w7fdd
By w7fdd · #150989 ·
Re: looking for service manual for HP4934A
Thanks Peter, maybe that it. Its covered in another model numbers manual. -- 73s Brian w7fdd
By w7fdd · #150988 ·
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
From experience, the 8481A series does not perform up well beyond 18 GHz. The response drops very quickly towards 19/20 GHz, and at 26.5 GHz, the response difference is more than 3 to 4 dB. The N
By F1EKU · #150987 ·
Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
I purchase a used Nikon 8x, 20x, 100x binocular microscope quite a while ago, added the Illuminator ring. It is a superb instrument, but not light in weight. Price was $75 then, 15 yrs. ago. I have
By Don Bitters · #150986 ·
Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?
Have a HP 8485A sensor I bought used, turns out it had been damaged due to overload, seller refunded, now have a physically nice but electrically dead HP 8485A sensor. Have a HP 8481A sensor surplus
By David Feldman · #150985 ·
Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
If it says made in China, they are mostly subpar compared to used good Euro and Japan lenses.
By John Griessen · #150984 ·
Re: microscope / high magnification camera options for soldering, faults, and other examinations/inspections
A bit of a follow up on this. I think the point about stereo microscopes giving indication of depth is invaluable, and exactly the kind of information one hopes to get on here. But I will say I also
By Radu Bogdan Dicher · #150983 ·