--

HP8558B Versus HP182T Sweep Fail.

Good year 2022 without the accursed bug.

Well there everyone

?

In April 2019 my HP8558B decided to let it do the sweep? Fig0 , I found that only with external sweep it worked, it was on the waiting list for a better analysis, however I was around the HP8116A and with external help I got there (well there Markl).

In December 2021, in a visual inspection of the HP8558B plugin, I found that some of the contacts (fingers) of the 4 switches were loose, and I thought it was here, and the novel that I summarize below began

Preliminary Notes: Understanding certain details implies access to the HP182T/C Service Manual.

I urge HP experts to speak up.

?

1st 2019 I lost the HP8558B scan Fig0

2nd 2021 I considered that the failure was due to lack of contact finger in the SW. Fig1 and Fig1.1 , ward work.

3rd mechanically fixing the fingers of the SW Fig2

4th Malfunction remains?

5th Test of the switches all OK, with the help of a kit adapted from the IC card HP10529-20005 Fig3 and fig4.

6th Why not use my HP180C+HP1802 and HP1821A that is stopped !! fig5 , because I haven't used it before ?

Test with the Main Frame HP180C and the HP8558B, after de-rusting the switches and adjusting, voilá HP8558B OK!!

7th Use 182T with HP1801 and HP1821 OFF, I confirm the failure is in the HP182T.

8th All voltages on HP182T OK.

9th Summary measurement of transistor and diode junctions (all?) OK

10? Measurement of HT -3KV ?? and 19KV ?? , result? +-2.9 and +-? 18KV, OK

10th Use of two 1V 100 Hz sine wave generators for input on the HP1801A and the EXT INPUT sweep on the 180C

11? Results in a distorted Lissajous image by pressing FIND BEAM Fig6

12th With Intensity CW almost at MAX. clear image Lissajous Fig7

13th In sweep INT values of UNBLANKING GATE board A7 pin14 is -0.2V should be -0.7V

14th Output on board A7 ALT TRIGGER pin13 for Plug-in not detected?

15th UNBLANKING SIGNAL output values also in A7 pin w4, is between +20 and +75V when it should be between +42 and +92V? DC values, and is not a square signal.

16th I'm in a fish situation with is tail in the mouth.

Best regards

Bem Hajam

PS: I am new in this site , missing photos .

Hern?ni Capela

I'm currently looking for any patents released for the HP 8662/3A,
mostly to determine if there's any information about the firmware that
will help in debugging a faulty DCU. HP released the source code for
other equipment (e.g., the 8510) in patents.

However, my difficulty in tracking down associated patents raises the
somewhat broader question of how to reliably find patents for
devices. Currently my methods feel a bit imprecise: I go to
patents.google.com and set the patent office and language, and the
assignee to "Hewlett-Packard Company". Then, I try to determine when the
instrument was released and set the filing date range for several years
before and after this date. I also don't have a robust way currently to
determine the date the instrument was released. However, in this case
the February 1981 Journal featured the HP 8662A, so that's the date I'm
searching around. Finally, I add search terms such as "signal generator"
or "synthesized signal generator" to narrow the results.

This method will still leave 100+ entries to sift through. Moreover,
it's not always entirely trivial to determine which patents are
associated with a particular instrument. For instance, I found
US4323959, which I believe applies to the 8662A. However, this required
knowing that the 8662/3 use a switching power supply with an inverter,
which was unusual and novel for an instrument like this at that time.

Is there a better way?

The Motorola 6800 page
() lists patents
associated with that family of devices. And, the language makes it sound
like these are all the associated patents. So, maybe there's a better
way to find all the patents for a device?

Thanks
Matt

One of them tests completely open, and the ESR on the other is several hundred ohms....

I have located a set of capacitors through another person on this list, so hopefully replacing them (and all the other smaller electrolytics in the power supply) gets my unit up and running again.

73,
Bob Weiss N2IXK

The systematic is the same on pretty much all HP 8752/53/19/20/22 analyzers, you find the serial number and the 3 Fx codes are setting the options!
one word of caution though on the 8753E/ES CPU board, when removing and resoldering the SMT eeprom
?you need to clean up all flux residue throughly or you can get issues?

Does anyone know the pinout of the 08516-60009
interconnect cable that connects the 8516 to the 8341B ?

开云体育

开云体育

---

Hello,

Has anyone heard about the HP 14570A ? This is not a well-known product, it is an AC Power Switch, made by the New Jersey Division (formerly Harrison Labs), and described with some detail in the December 1982 issue of HP Journal.
Would anyone have a manual or schematics for the 14570A ? I have not been able to locate it on the Web.

Thanks,

Joel Setton

Anyone know what scope this transformer was used on?

开云体育

I recently dug out two 8640B sig generators I acquired last year. The newer (SN 16xx) has options 1 and 2 and seems to have RF as far as the counter goes but nothing at the output or the meter. The second (SN 14xx) has no options installed; the output (checked with a spectrum analyzer) is clean and the dials match the measurements.? Both units are in okay mechanical condition, the gearing seems to work okay, and each has the usual collection of dents and dings.? I have a couple of questions:

- I can't find a service or operating manual the covers the serial numbers around 14xx. The earlier manuals stop at 13xx and the newer manuals start at 16xx.? Does anyone know of a manual that covers this range? If not a manual, is there a set of change pages that bridges the gap between 13xx and 16xx?

- The working 8640B does what I need for my bench work and seems to be pretty close to specification wrt frequency and output levels, so I am inclined to just put it on my bench and use it. That said, is there some testing or preventive maintenance I should do?

- The non-working 8640B can probably be fixed but working out gear of this complexity is out of my wheelhouse.? Given that the counter suggests that RF is being generated, if I wanted to dig into the RF section, is the best strategy just to start at the N connector and work my way backwards?

Thanks in advance!

Bill

You Could try this.

Still fine and working since I re-built the unit back in 2012.



Regards

Gerald
VK3GJM

开云体育

开云体育

Hi Bob,

开云体育