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Date
Re: HP 8648B and an off topic request.
Hi Don Thank you for replying to me, it is much appreciated. First I have never seen an extension card that would work with this generator, the three plug in modules use a 9 pin D for the power and
By george edmonds · #83145 ·
Re: HP 8648B and an off topic request.
I've successfully run the 8648 calibration and motherboard utilities on WinXP SP3 w/Agilent IO v16.x and 82357B USB GPIB adapter. No special hacks needed other than it only worked on a physical
By Colby Burkett · #83144 ·
Re: HP6034 PSU Q1, 2 fet
Further updates, with some surprises.. I've performed PSU load test while monitoring output of the 'Input filter'. DVM (fluke 70) was utilized since a single ended scope probe is a wrong tool for this
By KI6EZ · #83143 ·
Re: HP 8648B and an off topic request.
George G6HIG, Looks like a useful instrument, I found several manuals searching "agilent 8648b manual." Also, try looking at the uP and the memory circuits supported by the backup battery. An
By Don Doughty · #83142 ·
Re: HP ESP120 Server 52V SMPS load removal question
Hi Chris In my experience most SMPS that were designed for computer use require a minimum load to operate correctly. Some will not turn on at all until a minimum load is present. It also strikes me
By george edmonds · #83141 ·
Re: HP6034 PSU Q1, 2 fet
Chuck Thank you for feedback. The voltage doubler filter (aka input filter) consist of 4 filter caps C2-C5 590uF 200VDC electrolytics (0180-2968) and a pair of inductors L1 and L2. As I have mentioned
By KI6EZ · #83140 ·
Re: HP 8660x series plug-in (8660 synthesizer) - rotary attenuation/
Andy, Thank you very much for the suggestion. I of course failed to add an important detail in my original post: the mainframe is known good, as another plug-in on this same mainframe works normally,
By David Feldman · #83139 ·
HP ESP120 Server 52V SMPS load removal question
29/04/2017 15:44 I am curious as to whether uncontrolled voltage regulation on the drains of big FETs used in a push pull low frequency (136kHz) RF amp run in quasi Class D may be caused by the 52V at
By Chris Wilson · #83138 ·
Re: 8592B to 8593A conversion (A25 counterlock retrofit)
Hi folks, just found my problem, there was another counter lock board, it's 08591-60027 and this one divides the sampling oscillator output by 40/41 and uses this signal as pll input. If I use my
By Thomas Gulden · #83137 ·
Re: HP8970A automatic Noise Gain meter
The Nominal 3.3V lithium cells are a really a 3.6V lithium thionyl chloride cells. If at low loads, they putter along at 3.65V for years and years, and then start a slow decline down to a couple of
By Chuck Harris · #83136 ·
Re: HP6034 PSU Q1, 2 fet
Typically there are two basic kinds of switchers: 1) full wave bridge/voltage doubler input, with a big capacitor filter. 2) power factor correcting preregulator, that drives main switcher, no big
By Chuck Harris · #83135 ·
Re: HP 8563A Spectrum Analyser - display itensity problems
Hi, if the display characters You can see are not distorted, You only have to do one thing. Place the analyzer on the bench, with outer chassie removed. Unscrew 8 torx screws on the module-boards; 3
By Bjoern · #83134 ·
Re: HP8970A automatic Noise Gain meter
I do not think 2.8 V is OK. If you have to recalibrate the IF attenuator the battery is low. HP uses 3.3 V batteries (not very common) instead of 3 V because the 3 V battery has not enough voltage
By DF9IC · #83133 ·
HP6034 PSU Q1, 2 fet
Hello, I'm following this with interest as I recently bought defective HP6024A and Blanko PS3003 switching supplys from the same person. (Who had already made repair attempts.) I've not dug into the
By shakalnokturn · #83132 ·
Re: HP6034 PSU Q1, 2 fet
Update 2017-04-28 After a week I've replacement parts: Q1, Q2 5080-2017 FET - IRF450. One of the original HP FETs was a 17 Ohm short!! Q3, 4 1854-0477 2N2222A - new metal cans CR11, 12 1901-0050 diode
By KI6EZ · #83131 ·
Re: HP 8640B range switch fingers and late manual
I did indeed rotate the disk and used the good "pegs". The melting process apparently made the old pegs very brittle and they'd just flake apart so I didn't opt to melt the "new" ones but relied on
By n4buq · #83130 ·
Re: HP 8640B range switch fingers and late manual
Clear Rotary Switch Decks: The switch decks are bi-directional. I was having an intermittent frequency readout problem and the original plastic prongs were broken down the at the base. I removed the
By John Kuivinen <wb6iqs@...> · #83129 ·
Re: HP 8640B range switch fingers and late manual
I used just epoxy. It's been years and they're still going. Dave Wise ________________________________________ Sent: Friday, April 28, 2017 7:05 PM To: hp agilent equipment Subject: Re:
By Dave Wise · #83128 ·
Re: 8566B Intermittant turn off
It is a logic signal on the main board. Might have a leaking capacitor (one of the big cans).
By Tom Miller <tmiller11147@...> · #83127 ·
Re: HP 8640B range switch fingers and late manual
If I recall, I think I stuck them with CA (super glue) and then drizzled a layer of epoxy on top just to make sure they won't go anywhere. Thanks, Barry - N4BUQ
By n4buq · #83126 ·