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Re: 8510C questions and cabling
Chuck,
That is page 1-3 of the document I referenced in my post. Neither of my 851x A/B test sets has the source interface. However, I just noticed a note on that page that the source interface is only used with the 8516A. The figure is much too busy. You don't mention the J10/J11 test set interconnect in your list. There is no display on the 83631B, so without connecting it to the 85101A & 85102A there is no way to get anything displayed. Reg |
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Re: HP 3455a DVM repair
Bob Albert
24.50 and 24.04 on each side of the diodes.
On Thursday, April 2, 2020, 04:51:49 PM PDT, Orin Eman <orin.eman@...> wrote:
So, it's looking like the main amplifier.? We can look at U2's inputs by measuring both sides of CR4 or CR5 (they are in parallel). They are above and to the right of TP5, close to J1; from below the right end of J1, L to R with J1 uppermost, the components are: CR4, CR5, U2, R11, C4, R12, R13Then look at U2's output by measuring both sides of R12. ?(One side of R13 goes to TP4, the other to R12.) On Thu, Apr 2, 2020 at 4:04 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
So, it's looking like the main amplifier.? We can look at U2's inputs by measuring both sides of CR4 or CR5 (they are in parallel). They are above and to the right of TP5, close to J1; from below the right end of J1, L to R with J1 uppermost, the components are: CR4, CR5, U2, R11, C4, R12, R13Then look at U2's output by measuring both sides of R12. ?(One side of R13 goes to TP4, the other to R12.) On Thu, Apr 2, 2020 at 4:04 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
Bob Albert
U5 pin 2, 13, 14 read -22, -14, -22 V respectively
On Thursday, April 2, 2020, 03:55:41 PM PDT, Orin Eman <orin.eman@...> wrote:
Two should be -24V, the other should (I think) be close to TP3.? I suspect you'll find one a diode drop from TP4. On Thu, Apr 2, 2020 at 3:27 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
Two should be -24V, the other should (I think) be close to TP3.? I suspect you'll find one a diode drop from TP4. On Thu, Apr 2, 2020 at 3:27 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
Bob Albert
Orin you say to take a look at U5 2,13, 14 but what should I see? Bob
On Thursday, April 2, 2020, 03:08:09 PM PDT, Orin Eman <orin.eman@...> wrote:
On Thu, Apr 2, 2020 at 1:25 PM Bob Albert via <bob91343=[email protected]> wrote:
TP3 should be close to whatever is being measured, whether it's the input or one of the auto-cal constants. ? So best to turn autocal off or the relays will be ticking and TP3 changing. TP4 being so low seems to indicate the main amplifier isn't working correctly.? There is negative feedback through Q18, Q19 or Q21 to Q17 from TP4.? They are controlled by A10U5.? I'd take a look at U5 pins 2, 13 and 14 that control the FET switches. Orin.? |
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Re: 8510C questions and cabling
Hi Reg,
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Here is a card that could be helpful to you. If it doesn't come across, it is called the HP8510C Pre Flight Checkout. The 83610B has all sorts of options. No options is best, as I recall. Press its preset button, and it will set itself up in sweep mode at its full frequency range. This will tell you if it is the 45MHz option, or the 10MHz option... or,you can just try tuning it down there. There are only 6 cables that connect the sweeper: 1) HPIB to the ANA's hub (not the external hub) 2) RF output to the test set's RF input. 3) Stop Sweep 4) Trigger 5) Source Interface 6) 10MHz reference. I have used the 8350B, and am currently using an 8340B, so I haven't actually tried the above connections. -Chuck Harris Reginald Beardsley via groups.io wrote: I just received an 83631B sweeper to complete my 8510C. In reading the service quick reference guide, 08510-90317, I see there are lots of gotchas and a bunch of cables I need, not all of which have HP part numbers listed clearly. It's also not clear which ones are needed when. In addition there are numerous notes about not making certain connections, but it's not clear which cable the reference is to. |
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Re: HP 3455a DVM repair
On Thu, Apr 2, 2020 at 1:25 PM Bob Albert via <bob91343=[email protected]> wrote:
TP3 should be close to whatever is being measured, whether it's the input or one of the auto-cal constants. ? So best to turn autocal off or the relays will be ticking and TP3 changing. TP4 being so low seems to indicate the main amplifier isn't working correctly.? There is negative feedback through Q18, Q19 or Q21 to Q17 from TP4.? They are controlled by A10U5.? I'd take a look at U5 pins 2, 13 and 14 that control the FET switches. Orin.? |
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8510C questions and cabling
I just received an 83631B sweeper to complete my 8510C. In reading the service quick reference guide, 08510-90317, I see there are lots of gotchas and a bunch of cables I need, not all of which have HP part numbers listed clearly. It's also not clear which ones are needed when. In addition there are numerous notes about not making certain connections, but it's not clear which cable the reference is to.
So here is what I have so far: 85101C / 3031A opt 010, 011 85102A / 2546A opt H0 w/ 85103A sticker dated 10/13/1987 and 8530A front panel label 83631B / 3844A w/ Agilent refurbished Jun 2000 sticker 8515A / 3602A 8512A / 2345A Neither the 8512A nor 8515A have the source interface port shown on p 1-3 of the service quick reference. Does that present a problem? The only cable I have at present is the 85101C to 85102A connection. I also have an HP floppy with the 8530A FW. The 8510C is what is currently loaded. I've not tried to read the 8530A disk yet. So now to questions: What other cables do I need? What do I need to use it in 8530A mode? Can the 8512A and 8515A be connected at the same time? Are any of the units incompatible? What do I need to do to bring this up? I've seen the 83631B listed as 10 MHz to 26.6 GHz and 45 MHz to 26.6 GHz. How does one tell which is the case? Is it test set dependent at the low frequency? I'm a hardcore Unix guy. Is it worth hunting down an HP 9000 series to use with it or can I use more recent computers e.g. HP Z400? HP-UX would have me trying to admin 5 distinct operating systems. Working entirely alone, I've discovered that it really taxes my memory switching between the 4 I'm already running. I've read a good bit of 8510 documentation, but the system is so complex that I'm not sure I've even found all of it, much less read everything I need to read. Thanks, Reg |
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Re: First Gen HP 54810A with dead HD, Got ISO 3.5, Any way to write it to a drive?
On Wed, Apr 1, 2020 at 10:58 PM <ujonsson@...> wrote:
Hi, My loved 54810A died on me. It is the oldest Gen 1 unit no VIN running 95 and it has not been upgraded. I did read up on the recovery process from the HP documentation and I have the version 3.5 disc image. I can open the ISO and I find the files listed below files.You are getting yourself confused. You only need the parallel port CDROM drive if you want to populate the hard drive while it's installed in the scope. If you connect the new hard drive to another computer, such as your laptop, you can use its regular CDROM drive. |
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Re: HP 3455a DVM repair
The Artek version may not be free, but I can state (from multiple
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direct experiences) that Dave does an amazing job, IMO worth every penny of his (again, IMO) very reasonable prices. If the unit is worth repairing, it's worth having a readable manual to help fix it. The decision is, ultimately, up to you but... If it were me, I'd do it in a heartbeat. On 02-Apr-20 13:25, Bob Albert via groups.io wrote:
Unfortunately, the Artek scan isn't free, so I will have to pass on that. --
--- Bruce Lane, ARS KC7GR kyrrin (at) bluefeathertech dot com "Quando Omni Flunkus Moritati" (Red Green) |
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Re: HP 3455a DVM repair
Bob Albert
Unfortunately, the Artek scan isn't free, so I will have to pass on that. Back to the hardware, the readout shows OL on the high ranges and zeros on the low ranges.? I don't understand the relationships with the range settings, autocal, and autozero.? Sometimes TP4 shows -14V and sometimes -13V.? TP3 shows the input from the panel but not always.? This unit is way over my head. Bob
On Thursday, April 2, 2020, 12:49:21 PM PDT, Orin Eman <orin.eman@...> wrote:
I took a look at that one. The text looks OK, but the diagrams and schematics aren't really readable. I'd get the Artek scan. On Thu, Apr 2, 2020 at 12:40 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
I took a look at that one. The text looks OK, but the diagrams and schematics aren't really readable. I'd get the Artek scan. On Thu, Apr 2, 2020 at 12:40 PM Bob Albert via <bob91343=[email protected]> wrote:
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Re: HP 3455a DVM repair
Bob Albert
My manual is one I downloaded from the Keysight site.
On Thursday, April 2, 2020, 11:20:40 AM PDT, Bob Albert via groups.io <bob91343@...> wrote:
Orin, TP4 is at about -13 Volts, no relation to the input signal. Bob
On Thursday, April 2, 2020, 10:31:01 AM PDT, Orin Eman <orin.eman@...> wrote:
On Thu, Apr 2, 2020 at 9:44 AM Bob Albert via <bob91343=[email protected]> wrote:
Which manual do you have? The Artek scan that I have has a diagram of the A10 board on page 222 of the pdf (or at "A10 & A12 Board" under Diagrams in the bookmarks in Artek's scan). Orin.? |
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Re: HP 3455a DVM repair
Bob Albert
Orin, TP4 is at about -13 Volts, no relation to the input signal. Bob
On Thursday, April 2, 2020, 10:31:01 AM PDT, Orin Eman <orin.eman@...> wrote:
On Thu, Apr 2, 2020 at 9:44 AM Bob Albert via <bob91343=[email protected]> wrote:
Which manual do you have? The Artek scan that I have has a diagram of the A10 board on page 222 of the pdf (or at "A10 & A12 Board" under Diagrams in the bookmarks in Artek's scan). Orin.? |
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Re: HP 3455a DVM repair
On Thu, Apr 2, 2020 at 9:44 AM Bob Albert via <bob91343=[email protected]> wrote:
Which manual do you have? The Artek scan that I have has a diagram of the A10 board on page 222 of the pdf (or at "A10 & A12 Board" under Diagrams in the bookmarks in Artek's scan). Orin.? |
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Re: HP 3455a DVM repair
On Thu, Apr 2, 2020 at 9:44 AM Bob Albert via <bob91343=[email protected]> wrote:
What is TP4? ?0V? BTW, best to turn auto-cal off or it will be constantly trying to switch back and forth between the input signal and references. |
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Re: HP 3455a DVM repair
Bob Albert
Dan, I have done much of what you suggest.? The front/rear switch is okay.? Even on Ohms it reads all zeros. On power up it presents OL until I push some buttons.? On TEST it goes through from 11 in sequence down to 0.? In Ohms the front jacks put out a test current. It's complicated by the fact that I don't know where the parts are for different parts of the diagrams.? All cables have been wiggled, all parts have been poked and tapped.? Nothing is running hot.? TP3 replicates the input signal but TP4 does not.? The 10V reference is spot on. The plethora of information in the manual is overwhelming. Bob
On Thursday, April 2, 2020, 09:30:20 AM PDT, Stephen Hanselman <kc4sw.io@...> wrote:
Good point Don, although the real question would be is the front/back switch still a switch. ?We have seen a couple where the switch contacts themselves went bad. ?Nothing gets through, but it does pass self test.? Regards, ? Stephen Hanselman Datagate Systems, LLC On Apr 2, 2020, at 07:21, Don Bitters via groups.io <donbitters@...> wrote:
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Re: HP 3455a DVM repair
¿ªÔÆÌåÓýGood point Don, although the real question would be is the front/back switch still a switch. ?We have seen a couple where the switch contacts themselves went bad. ?Nothing gets through, but it does pass self test.?Regards, ? Stephen Hanselman Datagate Systems, LLC On Apr 2, 2020, at 07:21, Don Bitters via groups.io <donbitters@...> wrote:
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Bruce Lane
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