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Looks like Artek Manuals has it. See < http://artekmanuals.com/manuals/hp-manuals/>. [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:

Forwarded from Tekscopes.

That is typical of a problem where a full wave doubler is working half wave. This is one of those jobs where an isolation transformer is a good idea. You can get by without by using two probes, and

George, Some of the boards in the 8648 are very similar to those in the 8920. The Component Level Information Packet Manual Part Number: 08920-90107, has schematics. It is (or was) on Keysight.com.

Hi Don I now understand your email, having looked at the available HP manual, I will probe around the display connector and the RPG connector. However I suspect that without component level

Hi Chuck, Thanks for your comments on this. I will seek for a suitable battery to replace it. Studying the RAM chip data sheet learns that the data retention threshold voltage is 2V . Therefore 2,8V

Hi The DC voltage across the AC to DC stage storage capacitors will give a good indication of the health of the storage capacitors as you vary the output load. These capacitors must be high ripple

Hi Thank you for your reply, I still do have WinXP sp3 machines, however, the 82357B adapter is not easily available in the UK. The only ones listed on a famous action site are from China and vary in

Known good HP 6038A #1 Vout = 23.5Vdc Iout = 5.5Amps Input Filter out: Vdc = 317.5Vdc Vac = 1.48Vac (HP6034A = 12.2Vac!) #2 Vout = 23.5Vdc Iout = 9.5Amps Input Filter out: Vdc = 310.9Vdc Vac = 2.58Vac

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

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

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

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

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

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

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,

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

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

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

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