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J. Forster wrote:

I'm looking for two electrolytic caps:

Axial lead
1500 uF (1500-2200 OK)
75 Volt (75-100 OK)
Max OD 1"
Max Length 2 1/2"

A CDE TC75202 would be about right. A lead to a supplier that doesn't
have high minimums would also be useful.

These are replacements for use in a Tek FG504.

How about:



2200 ufd, 100 V. Item is radial lead so you will have to run an
insulated wire around to convert it to axial. It is well within your
size constraints.

--
Bob Smither, PhD Circuit Concepts, Inc.
=========================================================================
You have the right to YOUR life, liberty and property, but not MINE
=========================================================================
Smither@... 281-331-2744(office) -4616(fax)

Jason, look at the supply near the rear panel (with the AC in connector) and see if there is a 9100 ohm power resistor. Is it burned out?
That would kill the 120 volt DC. This resistor is near the line voltage switch.

I believe for now you would not need an isolation transformer. Just do some careful looking.

As John stated, if there is no 120 volts, the supply will not work. But there are many things that can shutdown the 120 volt supply.


I need to run now but will be back later.


Regards.
Tom






----- Original Message -----
From: ghostman1166@...
To: hp_agilent_equipment@...
Sent: Saturday, September 03, 2011 3:10 PM
Subject: [hp_agilent_equipment] Re: possiable power supply fault hp16500c



thanks again for all the help. i am working on getting the supply removed but i dont have full strengh in my hands so strugling with a couple of screws :D i will reconect the power once i have the unit removed.
as luck would have it i have a couple of old tv's in the shed so i might scrounge the transformer out of them for a isolating supply.
regards jason

--- In hp_agilent_equipment@..., "J. Forster" <jfor@> wrote:
>
> That's roughly what I'd expect. Comments interspersed.
>
> > Ok guys,
> >
> > This power supply does use some common ICs.
> >
> > UC3842N - off line PWM switcher -
> > My first guess is this is the pre-regulator for the 120 volts
>
> Yup. A switching downconverter to convert varying line into a stable 120
> or so. Expect a rectifier (possibly a doubler for 115 VAC), capacitor,
> switching transistor, choke, and freewheeling diode, low ESR capacitor,
> plus the chip.
>
> > UC3524N - PWM supply
> > It seems this switches the 120 volts down to the low voltage outputs
>
> Expect a transformer, a pair of driver transistors, several rectifiers
> (bridges or half bridges), filter capacitors.
>
> > TL431CP - programmable voltage reference - many used
>
> There could be part of linear or switching post-regiulators. Any pass
> transistors?
>
> > LM358N - Dual op amp
> >
> > LM339AN - Quad comparators
>
> The comparators are probably OVP and/or OCP.
>
> > NE556N
> > Very high Tech timers (well it was 1983)
> >
> >
> > This seems to be a pretty straight forward switching supply. This is from
> > my non-working spare and I am working through it.
>
> FWIW, if the 120 LED is off, only the pre-reg is likely to be bad.
>
> It would be very useful to know if the PS works properly with no load
> connected. Some switchers shut down w/o load on OVP.
>
> -John
>
> ===================
> >
> > Regards,
> > Tom
> >
> >
> > ----- Original Message -----
> > From: J. Forster
> > To: hp_agilent_equipment@...
> > Sent: Friday, September 02, 2011 10:09 PM
> > Subject: Re: [hp_agilent_equipment] Re: possiable power supply fault
> > hp16500c
> >
> >
> >
> > OK. I'll see if I can get any info after the long weekend.
> >
> > Best,
> >
> > -John
> >
> > ====================
> >
> > >
> > > Made by OECO Corp model number 080-20521-01 HP part number 0950-1853
> > >
> > > I need to take a closer look.
> > >
> > > Tom
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: J. Forster
> > > To: hp_agilent_equipment@...
> > > Sent: Friday, September 02, 2011 6:17 PM
> > > Subject: Re: [hp_agilent_equipment] Re: possiable power supply fault
> > > hp16500c
> > >
> > >
> > >
> > > Who made the PS and what is the part/model number?
> > >
> > > I'd bet that it's similar to other supplies that the vendor made,
> > > perhaps
> > > repackaged. The schemats for a similar supply might be available.
> > >
> > > Many PSs use a common inverter part, rated in Wattage classes, along
> > > with
> > > custom rectifiers and regulators. So, there might well be a dozen or
> > so
> > > designs with various output voltages, that all use the same inverter.
> > >
> > > Is the controller chip a standard part? Often the App Notes for a chip
> > > can
> > > give a pretty good idea of how the circuit works.
> > >
> > > -John
> > >
> > > ===================
>





[Non-text portions of this message have been removed]

Jason, look at the supply near the rear panel (with the AC in connector)
and see if there is a 9100 ohm power resistor. Is it burned out?
That would kill the 120 volt DC. This resistor is near the line voltage
switch.

I believe for now you would not need an isolation transformer. Just do
some careful looking.

As John stated, if there is no 120 volts, the supply will not work. But
there are many things that can shutdown the 120 volt supply.


I need to run now but will be back later.


Regards.
Tom






----- Original Message -----
From: ghostman1166@...
To: hp_agilent_equipment@...
Sent: Saturday, September 03, 2011 3:10 PM
Subject: [hp_agilent_equipment] Re: possiable power supply fault
hp16500c



thanks again for all the help. i am working on getting the supply
removed but i dont have full strengh in my hands so strugling with a
couple of screws :D i will reconect the power once i have the unit
removed.
as luck would have it i have a couple of old tv's in the shed so i might
scrounge the transformer out of them for a isolating supply.
regards jason

--- In hp_agilent_equipment@..., "J. Forster" <jfor@...>
wrote:
>
> That's roughly what I'd expect. Comments interspersed.
>
> > Ok guys,
> >
> > This power supply does use some common ICs.
> >
> > UC3842N - off line PWM switcher -
> > My first guess is this is the pre-regulator for the 120 volts
>
> Yup. A switching downconverter to convert varying line into a stable
120
> or so. Expect a rectifier (possibly a doubler for 115 VAC), capacitor,
> switching transistor, choke, and freewheeling diode, low ESR
capacitor,
> plus the chip.
>
> > UC3524N - PWM supply
> > It seems this switches the 120 volts down to the low voltage outputs
>
> Expect a transformer, a pair of driver transistors, several rectifiers
> (bridges or half bridges), filter capacitors.
>
> > TL431CP - programmable voltage reference - many used
>
> There could be part of linear or switching post-regiulators. Any pass
> transistors?
>
> > LM358N - Dual op amp
> >
> > LM339AN - Quad comparators
>
> The comparators are probably OVP and/or OCP.
>
> > NE556N
> > Very high Tech timers (well it was 1983)
> >
> >
> > This seems to be a pretty straight forward switching supply. This is
from
> > my non-working spare and I am working through it.
>
> FWIW, if the 120 LED is off, only the pre-reg is likely to be bad.
>
> It would be very useful to know if the PS works properly with no load
> connected. Some switchers shut down w/o load on OVP.
>
> -John
>
> ===================
> >
> > Regards,
> > Tom
> >
> >
> > ----- Original Message -----
> > From: J. Forster
> > To: hp_agilent_equipment@...
> > Sent: Friday, September 02, 2011 10:09 PM
> > Subject: Re: [hp_agilent_equipment] Re: possiable power supply fault
> > hp16500c
> >
> >
> >
> > OK. I'll see if I can get any info after the long weekend.
> >
> > Best,
> >
> > -John
> >
> > ====================
> >
> > >
> > > Made by OECO Corp model number 080-20521-01 HP part number
0950-1853
> > >
> > > I need to take a closer look.
> > >
> > > Tom
> > >
> > >
> > >
> > >
> > > ----- Original Message -----
> > > From: J. Forster
> > > To: hp_agilent_equipment@...
> > > Sent: Friday, September 02, 2011 6:17 PM
> > > Subject: Re: [hp_agilent_equipment] Re: possiable power supply
fault
> > > hp16500c
> > >
> > >
> > >
> > > Who made the PS and what is the part/model number?
> > >
> > > I'd bet that it's similar to other supplies that the vendor made,
> > > perhaps
> > > repackaged. The schemats for a similar supply might be available.
> > >
> > > Many PSs use a common inverter part, rated in Wattage classes,
along
> > > with
> > > custom rectifiers and regulators. So, there might well be a dozen
or
> > so
> > > designs with various output voltages, that all use the same
inverter.
> > >
> > > Is the controller chip a standard part? Often the App Notes for a
chip
> > > can
> > > give a pretty good idea of how the circuit works.
> > >
> > > -John
> > >
> > > ===================
>









------------------------------------

Yahoo! Groups Links

That's roughly what I'd expect. Comments interspersed.

Ok guys,

This power supply does use some common ICs.

UC3842N - off line PWM switcher -
My first guess is this is the pre-regulator for the 120 volts

Yup. A switching downconverter to convert varying line into a stable 120
or so. Expect a rectifier (possibly a doubler for 115 VAC), capacitor,
switching transistor, choke, and freewheeling diode, low ESR capacitor,
plus the chip.

UC3524N - PWM supply
It seems this switches the 120 volts down to the low voltage outputs

Expect a transformer, a pair of driver transistors, several rectifiers
(bridges or half bridges), filter capacitors.

TL431CP - programmable voltage reference - many used

There could be part of linear or switching post-regiulators. Any pass
transistors?

LM358N - Dual op amp

LM339AN - Quad comparators

The comparators are probably OVP and/or OCP.

NE556N
Very high Tech timers (well it was 1983)


This seems to be a pretty straight forward switching supply. This is from
my non-working spare and I am working through it.

FWIW, if the 120 LED is off, only the pre-reg is likely to be bad.

It would be very useful to know if the PS works properly with no load
connected. Some switchers shut down w/o load on OVP.

-John

===================

Regards,
Tom


----- Original Message -----
From: J. Forster
To: hp_agilent_equipment@...
Sent: Friday, September 02, 2011 10:09 PM
Subject: Re: [hp_agilent_equipment] Re: possiable power supply fault
hp16500c



OK. I'll see if I can get any info after the long weekend.

Best,

-John

====================

>
> Made by OECO Corp model number 080-20521-01 HP part number 0950-1853
>
> I need to take a closer look.
>
> Tom
>
>
>
>
> ----- Original Message -----
> From: J. Forster
> To: hp_agilent_equipment@...
> Sent: Friday, September 02, 2011 6:17 PM
> Subject: Re: [hp_agilent_equipment] Re: possiable power supply fault
> hp16500c
>
>
>
> Who made the PS and what is the part/model number?
>
> I'd bet that it's similar to other supplies that the vendor made,
> perhaps
> repackaged. The schemats for a similar supply might be available.
>
> Many PSs use a common inverter part, rated in Wattage classes, along
> with
> custom rectifiers and regulators. So, there might well be a dozen or
so
> designs with various output voltages, that all use the same inverter.
>
> Is the controller chip a standard part? Often the App Notes for a chip
> can
> give a pretty good idea of how the circuit works.
>
> -John
>
> ===================

Hi all,

please check first whether the T&M instrument has a scope type display
or a video display. My HP8591 has a vidio one and I connected just a
standard video grabber (cheap nowadays) mainly for taking hardcopies.
A cheap old laptop will do the work.
Or, what about this:


Kind regards


please check first whether the T&M instrument has a sscope type display
or a video display. My HP8591
--- In hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>, "Peter Reilley"
<peter@...> wrote:
>
> My understanding of SA's is that their displays are not fast.
> There is no advantage is sweeping too fast and a lot of
> disadvantages. I can't imaging needing more than 100KHz
> of bandwidth on the X and Y axes. That should give you plenty of time
> to draw the spectrum graph and the little bit of text. As long
> as you are faster than the human bandwidth there is no
> need to go faster.
>
> Pete.
>
>
> ----- Original Message -----
> From: Kuba Ober
> To: hp_agilent_equipment@...
<mailto:hp_agilent_equipment%40yahoogroups.com>
> Sent: Thursday, September 01, 2011 8:23 PM
> Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter
>
>
>
> > What is the speed of the old Tek and HP X/Y monitors?
>
> The question is: are those fast enough to be used to replace
> what was inside the box of various otherwise useful HP
> instruments.
>
> I'm also more than willing to have potentially extra functionality
> included, perhaps bypassing some of the circuitry in the instrument.
> My favorite would be to have a swept FFT by taking in directly
> the baseband output from a SA -- with a 16 bit ADC it should be feasible.
>
> I'm also looking at digitizing the frequency of the LO outputs from
> a SA to obtain precise frequency for any part of the display.
> I think I previously incorrectly said digitizing IF -- that's of course
> possible, but it'd be the last IF if anything. Inputting any number of
> LOs and digitizing their frequency should be very simple, as would be
> calculating the resulting center frequency. I think the hardest part
would
> be to make sure my device won't pollute the LOs, so I'd be learning some
> new tricks too.
>
> My starting point is to run my 7L14 with a mainframe with no CRT, then to
> tap LO1 and LO2 outputs for precise center frequency, then to tap
directly
> into the last IF output before the video processor (detector, LOG/LIN,
> digitizer).
>
> I can't really afford to get various other instruments that this
would work with,
> so I thought it'll be easier to ask for ideas instead of having to
rummage
> through downloads of HP manuals.
>
> So my appeal is as follows, to make it easy and technical: if you
have a SA
> or another instrument that you'd like to get a replacement display
for, give me
> the specs on its X-Y-Z outputs, and also on the LO frequency ranges and
> levels -- obviously if those LOs are available as outputs without
disassembly.
> That's give me some idea as to how to set up the signal processing
(gains,
> bandwidths, etc).
>
> Kuba
>
>
>
>

Hi Jason,

Getting a working spare power supply sounds like the way to go. I dont know how your tax system works but if you get the supply from Ridge, I can pick it up and just send it to you so you don't get hit for a too large bill. But check with them to be sure.

As to an isolation transformer, here is one that looks good:



A bit cheaper here:



600 VA, 120/240 volts 50/60 Hz should do well for most switching supply servicing.


Regards,
Tom


----- Original Message -----
From: ghostman1166@...
To: hp_agilent_equipment@...
Sent: Saturday, September 03, 2011 11:19 AM
Subject: [hp_agilent_equipment] Re: possiable power supply fault hp16500c



i think i will try and sort the money to get one shipped over to the uk (PSU). once that is safely here then i will look at 'tinkering' with the broken one.i dont yet have the confidence to go messing with one of theese, i had a stroke last year so fine work is still difficult! thanks for all the help i will keep you posted on progress!
great to know there are still some spare parts about.
while i have the covers off i will take the leads of etc and give all the contacts a clean as there is a fair but of gunge in the machine not to mention more than a few spiders in webs!!
managed to contact the guy i got it off and he wasnt much help, also mentioned to me that the hard drive is probally shot!! but having read the messages on here when i get the power back i might look at putting a cf card in :D.any other spares i should be on the look out for?
one last thing if i may.. where is the best place to get a isolating transformer from?
kind regards jason
--- In hp_agilent_equipment@..., leedyt@ wrote:
>
>
> Hi:
>
> Ridge Quipment (www.ridgeequipment.com) has lots of these PSU for about $25. I keep a few spares for my 16500Cs. They are easy to swap out and impossible to fix.
>
> Tom Leedy
> Clarksburg, MD 20871
>
>
>
> --- In hp_agilent_equipment@..., "ghostman1166@" <ghostman1166@> wrote:
> >
> > hi guys i am new to electronics and need some advice.
> > first my tale of woe....i wont bore you with all the details but basicaly i was stupid and brought privately a hp16500c, i drove 250 miles to pick it up (met the guy in a carpark!! first big mistake), and purchased what i belived was a fully working logic analyzer. ok yes it was stupid.got it home and it's dead!!! . . .>
>





[Non-text portions of this message have been removed]

Hi:

Ridge Quipment (www.ridgeequipment.com) has lots of these PSU for about $25. I keep a few spares for my 16500Cs. They are easy to swap out and impossible to fix.

Tom Leedy
Clarksburg, MD 20871



--- In hp_agilent_equipment@..., "ghostman1166@" <ghostman1166@> wrote:

hi guys i am new to electronics and need some advice.
first my tale of woe....i wont bore you with all the details but basicaly i was stupid and brought privately a hp16500c, i drove 250 miles to pick it up (met the guy in a carpark!! first big mistake), and purchased what i belived was a fully working logic analyzer. ok yes it was stupid.got it home and it's dead!!! . . .>

My understanding of SA's is that their displays are not fast.
There is no advantage is sweeping too fast and a lot of
disadvantages. I can't imaging needing more than 100KHz
of bandwidth on the X and Y axes. That should give you plenty of time
to draw the spectrum graph and the little bit of text. As long
as you are faster than the human bandwidth there is no
need to go faster.

Pete.


----- Original Message -----
From: Kuba Ober
To: hp_agilent_equipment@...
Sent: Thursday, September 01, 2011 8:23 PM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter



> What is the speed of the old Tek and HP X/Y monitors?

The question is: are those fast enough to be used to replace
what was inside the box of various otherwise useful HP
instruments.

I'm also more than willing to have potentially extra functionality
included, perhaps bypassing some of the circuitry in the instrument.
My favorite would be to have a swept FFT by taking in directly
the baseband output from a SA -- with a 16 bit ADC it should be feasible.

I'm also looking at digitizing the frequency of the LO outputs from
a SA to obtain precise frequency for any part of the display.
I think I previously incorrectly said digitizing IF -- that's of course
possible, but it'd be the last IF if anything. Inputting any number of
LOs and digitizing their frequency should be very simple, as would be
calculating the resulting center frequency. I think the hardest part would
be to make sure my device won't pollute the LOs, so I'd be learning some
new tricks too.

My starting point is to run my 7L14 with a mainframe with no CRT, then to
tap LO1 and LO2 outputs for precise center frequency, then to tap directly
into the last IF output before the video processor (detector, LOG/LIN,
digitizer).

I can't really afford to get various other instruments that this would work with,
so I thought it'll be easier to ask for ideas instead of having to rummage
through downloads of HP manuals.

So my appeal is as follows, to make it easy and technical: if you have a SA
or another instrument that you'd like to get a replacement display for, give me
the specs on its X-Y-Z outputs, and also on the LO frequency ranges and
levels -- obviously if those LOs are available as outputs without disassembly.
That's give me some idea as to how to set up the signal processing (gains,
bandwidths, etc).

Kuba



[Non-text portions of this message have been removed]