¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Single Messages Topics Expanded

Re: 3582A troubleshooting

 

¿ªÔÆÌåÓý

Somebody did a Design Idea in EDN or Electronic Design magazine with a similar technique to quickly find open Christmas lights.

Jim Ford?



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Mike Vande Voort <mike@...>
Date: 9/10/20 12:17 PM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] 3582A troubleshooting

all the posts about shorts in power supplies reminds me of the days

when I was a kid working in my uncles automobile repair shop. This was

damn near pre transistor, and most cars that we worked on still had points.

?

Once and awhile a car would come in with a short, typically in the wiring,

and ?it was a real pain to attempt to track down; open up a loom, cut a wire and

try to determine which side of the short you were on, then splice the wire, etc.

?

My uncle had a tester, which was little more than a turn signal flasher

of the bimetal clicker variety and a compass. One simply removed the fuse,

hooked the flasher to the battery and the load and it would start to cycle.

Then you simply ran the compass over the loom with the short in it, the

compass would align with the current in the short, and reverse direction when you

ran past the short. This reduced the investigative time tremendously.

?

Some clever individual could accomplish the same thing with a solid state pulser

and a current limited power supply, and use a magnetic sensor to go right to the

shorted item (or a half inch diameter Cracker jack compass) , and only have to unsolder one part.

?

?

?

From: [email protected] <[email protected]> On Behalf Of Dave Casey
Sent: Friday, September 04, 2020 1:11 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 3582A troubleshooting

?

Could just as easily be a blown transistor in the switcher causing it to pop the fuse.

?

Dave Casey

?

On Thu, Sep 3, 2020 at 11:57 PM Dave McGuire <mcguire@...> wrote:


? ?I found it, or at least narrowed it down.? The instrument functions
when I plumb in a bench supply to replace the 5.1V regulator board
(A16), so it would seem the problem is somewhere on that board.? It
draws ~3.7A on that rail, which seems reasonable for a regulator of that
design.? Do you concur?

? ?And it actually seems to run rather nicely, producing results that,
make sense, though I've not exhaustively verified them.? And the CRT is
in decent shape, which is a nice bonus.

? ?So now to troubleshoot the 5.1V regulator board.? I did check those
two large capacitors; they're not in great shape but they're not shorted.

? ? ? ? ? ? ? -Dave

On 9/3/20 6:07 PM, tmillermdems wrote:
> It is a switching supply that takes 50 volts down to 5. Start with your
> DMM and look for a shorted cap on A16. The +5 goes to almost every board
> so the possibilities for a shorted cap are nearly endless. Hopefully
> that will be the problem so an extender can be avoided. If the short is
> not on A16, you can pull boards to locate the problem just using your DMM.
>
> Good luck. It is an interesting instrument.
>
> Tom
>
>
>
> On 9/3/2020 4:55 PM, Dave McGuire wrote:
>>
>> ? Hey folks.? I seem to recall there being a few people here who have
>> worked on 3582As.
>>
>> ? I have one that's blowing the fuse on the 5.1V regulator board
>> (A16).? I've not dug into it beyond replacing the fuse, which blew
>> again immediately.? Before I dig in, is this a common fault?
>>
>> ??????????????? Thanks,
>> ??????????????? -Dave
>>
>


--
Dave McGuire, AK4HZ
New Kensington, PA
Join [email protected] to automatically receive all group messages.