开云体育

thanks for all the sugestions!! it will take me a little while to work
through them all, to answer the question on test equipment avaliable, i
have managed to gather a few basics, so i have a fairly good DMM its not a
fluke but its a pretty good tenma, i also have a DSO a rather old but
trusty gould 2 channel 150mhz. i also have a temp controlled soldering
station. and a bog standard spring loaded desoldering pump.
i will look into the transformer as that seems a sensoable idea to have
one anyway. if someone is willing to have the supply sent to them to look
at it for me and would like a pattern generator in return ;) :D .
i will have a go at the ideas posted so far but i think its best i refrain
from desoldering lol. i will post later to update on progress :D
i must say i been on the net for years and never come across such a
friendly and helpful bunch before! i feel at home already!
--- 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!!! not a single sign of life.i had
a 2 hour flap and panick then downloaded the service and read it a
couple of hundread times (ok maybe 10-12times) i have checked the leds
and it appears the 120v led dosnt light. so am i right in thinking that
its the PSU thats croaked it? or are there other things i can check.
i would realy love to get it working as it took severn months to save up
for it!! if it is the PSU is it possiable to get a replacement or can
theese be fairly easilly fixed by an idiot?
the machine has 2 timing cards and a pattern generator so i am reluctant
to consign it to skip.
many thanks for any help your able to give
regards jason

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!!! not a single sign of life.i had a 2 hour flap and panick then downloaded the service and read it a couple of hundread times (ok maybe 10-12times) i have checked the leds and it appears the 120v led dosnt light. so am i right in thinking that its the PSU thats croaked it? or are there other things i can check.
i would realy love to get it working as it took severn months to save up for it!! if it is the PSU is it possiable to get a replacement or can theese be fairly easilly fixed by an idiot?
the machine has 2 timing cards and a pattern generator so i am reluctant to consign it to skip.
many thanks for any help your able to give
regards jason

unfortuanately i live in the middle of nowhere!! so borrowing equipment isnt an option :( i live in the uk near northlew devon so if there are any other humans that live less than a days travel away please speak up (grins).
i guess i could trawl through and start by changeing any caps that look suspect. i am a complete beginner tho so there is always the fear of messing it up worse than it is! still nothing ventured..........
i took up electronics last year when a serious illness meant i had to give up work and i am somewhat confined to the house most days so i wanted a hobby to help keep boredom at bay! wish i had taken it up years ago its totaly fascinating, even simple stuff like making transistors switch on a relay give me a thrill :D thanks again for all the help!

--- In hp_agilent_equipment@..., "Tom Miller" <tmiller@> wrote:

Hi Jason,

Why don't you see if you can buy or borrow an ESR meter and go through the power supply capacitors. Many times, an electrolytic capacitor will fail open and the supply will stop working. I don't think it is too hard to pull the supply. Take pictures so you will know how to put it back together.

You might also state what hemisphere you are in. Who knows, maybe someone on this list might live next door to you and can collaborate in getting you back online.


Regards,
Tom




----- Original Message -----
From: ghostman1166@
To: hp_agilent_equipment@...
Sent: Friday, September 02, 2011 11:11 AM
Subject: [hp_agilent_equipment] Re: possiable power supply fault hp16500c





--- In hp_agilent_equipment@..., J <rpoz28cam@> wrote:
>
> Jason,
> 脗
> I wouldn't loose much sleep over your equipment woes.脗 Older equipment will always need some repairs or maint of some form or another.脗 The equipment you pick up with 'no power' are sometimes the best pieces to get, they have not been tampered or altered from their original designs as much (rogue repair attempts).脗 脗 Power supply failures or no signs of life脗 can be the best thing that happend to the machine脗 because some people just put it away .. on a shelf or in a closet for later review.脗 These can be really good jewels or treasures.脗 I bought a HP 34401 benchtop DMM (very nice脗 unit)脗 with no signs of life and come to find out, all that was wrong with it was it had a脗 blown .125/250v amp fuse which is the one used when operated on 220V instead of a .250 amp fuse.. so guess what? I replaced the fuse and the rear power input assembly (fractured inside the ITC connector) and shes like a brand new piece of equipment.. even passed calibration
> certification with flying colors.脗
> 脗
> Jon
> 脗
>
> From: Alexandre Souza <alexandre.tabajara@>
> To: hp_agilent_equipment@...
> Sent: Friday, September 2, 2011 8:34 AM
> Subject: Re: [hp_agilent_equipment] possiable power supply fault hp16500c
>
>
> 脗
> > If absolute worst comes to worst, you may be able to build up a power
> > supply from available units.
>
> There are some people on this list that has spare power supplies and may
> sell one for a cheap price to you. I believe they will enter in contact with
> you after this message :)
>
> Congratulations, the 16500C is a great tool, I have one myself :)
>
>
>
>
> [Non-text portions of this message have been removed]
>
thanks for the replays guys. this is realy good news!! i thought i was dead in the water. i have checked the fuse directly by the power socket on the machine and its fine, i also get the red led on the PSU board wich indicates the power board has power to light. currently checking the switches.
i have seen the flow chart in the service manual and it mentions the 120v led on the right hand side of the PSU, mine isnt lit and apparently should be.
feel much much happier now i have joined here! if anyone reading this has a compatiable supply they wish to sell please get in touch i am more than happy to pay a fair price :D.
likewise if anyone wants a pattern generator card(i will get the model number shortly)for a fair price or to do a swap let me know, in all honesty i cant see me ever having use for the generator! it has the cables but looks like there is no pods for the generator.
i will report back soon as i have tested the switches and will look for any on board fuses to check.
many thanks jason





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

Hi Jason,

Why don't you see if you can buy or borrow an ESR meter and go through the power supply capacitors. Many times, an electrolytic capacitor will fail open and the supply will stop working. I don't think it is too hard to pull the supply. Take pictures so you will know how to put it back together.

You might also state what hemisphere you are in. Who knows, maybe someone on this list might live next door to you and can collaborate in getting you back online.


Regards,
Tom




----- Original Message -----
From: ghostman1166@...
To: hp_agilent_equipment@...
Sent: Friday, September 02, 2011 11:11 AM
Subject: [hp_agilent_equipment] Re: possiable power supply fault hp16500c





--- In hp_agilent_equipment@..., J <rpoz28cam@> wrote:
>
> Jason,
> 脗
> I wouldn't loose much sleep over your equipment woes.脗 Older equipment will always need some repairs or maint of some form or another.脗 The equipment you pick up with 'no power' are sometimes the best pieces to get, they have not been tampered or altered from their original designs as much (rogue repair attempts).脗 脗 Power supply failures or no signs of life脗 can be the best thing that happend to the machine脗 because some people just put it away .. on a shelf or in a closet for later review.脗 These can be really good jewels or treasures.脗 I bought a HP 34401 benchtop DMM (very nice脗 unit)脗 with no signs of life and come to find out, all that was wrong with it was it had a脗 blown .125/250v amp fuse which is the one used when operated on 220V instead of a .250 amp fuse.. so guess what? I replaced the fuse and the rear power input assembly (fractured inside the ITC connector) and shes like a brand new piece of equipment.. even passed calibration
> certification with flying colors.脗
> 脗
> Jon
> 脗
>
> From: Alexandre Souza <alexandre.tabajara@>
> To: hp_agilent_equipment@...
> Sent: Friday, September 2, 2011 8:34 AM
> Subject: Re: [hp_agilent_equipment] possiable power supply fault hp16500c
>
>
> 脗
> > If absolute worst comes to worst, you may be able to build up a power
> > supply from available units.
>
> There are some people on this list that has spare power supplies and may
> sell one for a cheap price to you. I believe they will enter in contact with
> you after this message :)
>
> Congratulations, the 16500C is a great tool, I have one myself :)
>
>
>
>
> [Non-text portions of this message have been removed]
>
thanks for the replays guys. this is realy good news!! i thought i was dead in the water. i have checked the fuse directly by the power socket on the machine and its fine, i also get the red led on the PSU board wich indicates the power board has power to light. currently checking the switches.
i have seen the flow chart in the service manual and it mentions the 120v led on the right hand side of the PSU, mine isnt lit and apparently should be.
feel much much happier now i have joined here! if anyone reading this has a compatiable supply they wish to sell please get in touch i am more than happy to pay a fair price :D.
likewise if anyone wants a pattern generator card(i will get the model number shortly)for a fair price or to do a swap let me know, in all honesty i cant see me ever having use for the generator! it has the cables but looks like there is no pods for the generator.
i will report back soon as i have tested the switches and will look for any on board fuses to check.
many thanks jason





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

Agreed. Self-contained in the unit itself is best as well.

You will need at least a set of two 10 bit converters for X and Y and a lesser resolution but similar speed converter for Z modulation. Jumpers for the different typical instrument voltage levels would be nice as well as pots for fine tuning of gain and offsets. Just some real basic analog stuff. Power should be a wide range input of say 6 to 24 volts, a LDO probably, and you may want it analog so as to not have to worry about noise.

If you think 100 kHz is sufficient then perhaps an AD7993 would be good, 2 uS and 4 input channels. LTC has a bunch of very high speed ADCs(10's of MHz), but, heck, so does everyone these days. You want unipolar or bipolar inputs for your analog front end of course. It will come down to price. If you get the right family you could even go 12 bit or more as options.

I would say to avoid the fancy features initially. Don't bite off too much, you can always release more features in firmware later on.

Peter

Let's see if this posts. I am getting frigging tired of the "Unable to deliver your message" Yahoo BS.

--- In hp_agilent_equipment@..., "W2HX" <w2hx@...> wrote:

Personally, I like the no-PC approach. Don't have to worry about hard drives
failing, reinstalling long-obsolete operating systems, etc. I like a piece
of hardware (with embedded software)!

-----Original Message-----
From: hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...] On Behalf Of Kuba Ober
Sent: Thursday, September 01, 2011 8:10 PM
To: hp_agilent_equipment@...
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter

There will be a frame buffer, that's not a problem, and a video DAC
as an option -- it's one chip these days, not expensive either.

PC is of course cheap, but you may not wish to use one -- this is meant
to interface an instrument to a stand-alone off-the-shelf dirt-cheap
monitor OR a PC.

Kuba

On Sep 1, 2011, at 6:24 PM, Peter Reilley wrote:

If you go with VGA, DVI, HDMI or any other pseudo video
interface they you must include a video frame buffer, video speed
D/A converters and the logic to support it. Even though LCD
screens include a memory cell at each pixel it is not useful to you
given those interfaces. They scan the video just like the old CRT

monitors.

You can't beat a PC for cheep high quality video.

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

Pete.

----- Original Message -----
From: Kuba Ober
To: hp_agilent_equipment@...
Sent: Thursday, September 01, 2011 5:44 PM
Subject: Re: [hp_agilent_equipment] X-Y to VGA/USB converter

That's "almost" what we want, but not exactly. It has a fixed
800x600 resolution, and it will look like crap on widescreen
monitors. For some reason everyone must be watching movies on
their monitors, because non-widescreen aspect ratios are disappearing.
I've recently been to a local Microcenter and the best deals were only
to be had on widescreen units with ridiculous resolutions (say 1600x1000).

I'm thinking of something that would be $100 in parts for a basic version,
optimized for use with real instruments not some imaginary specs someone
thought up.

This means:

1. Input channels with ranges that allow 1:1 connection to a selection of
popular instruments (here I need *YOUR* help!).

2. Screen colorization options -- again, based on behavior of real
instruments.

3. Use with available and "future-proof" monitors -- that means
analog VGA would be one option (solder a DAC), DVI another (solder
LVDS drivers).

I think that for spectrum analyzers it'd be cool to have an option
of double IF inputs and on-board frequency counting to generate
an accurate X position and on-screen display/cursors. Again: I need
input from *YOU* as all I have is a Tek 7L14 SA plugin. I would need
to know what are the output levels, frequency ranges, etc. on IF outputs
from various SAs.

Obviously the board would have room for various options (VGA output,
DVI output, USB output, IF input, etc) and they'd be populated as needed.
So a basic version may have USB interface and three 12 bit input channels

with

10MHz bandwidth, and nothing else.

Since it smells like an FPGA-based solution, it's not unthinkable to have
an optional high-resolution (16 bits at 50+ MSps) channel to take video

output

from SA's and do level measurement and filtering or even swept FFT. This

would come

at a small incremental hardware cost, but obviously would be very useful.

Cheers, Kuba

On Sep 1, 2011, at 4:12 PM, W2HX wrote:

Check out vectorVGA Tempest


$179. However, some scaling input will be needed. I inquired to this

company

about using this for my 8566/68 specans. They have a product called the
VectorVGA PRO which is $2000 and will do what we want out of the box.
However, that's a lot of coin! I sent the XYZ specifications of my

specan

to them for comment on the applicability of the "tempest" version (which

has

nothing to do with electronic eavesdropping) and this is their

response....

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

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

Yahoo! Groups Links

Kuba,

I have an HP 8568B at the moment and would like to see something like you
describe developed for it, and for the 8566B too, which I hope to acquire
soon. The output specs are widely available and there were many units
produced that now have aging displays. From 1978 to 1997 if I'm not
mistaken. If I were making something like you mention, I'd start with this
market and compete with the color LCD replacement currently available at a
hefty price. I don't have the knowledge to do that though, and I wish you
well with this endeavor. I'd be happy to take measurements of my SA's
outputs or evaluate a prototype for you.

Steve


On Thu, Sep 1, 2011 at 7:23 PM, Kuba Ober <ober.14@...>wrote:

**

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

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

Yahoo! Groups Links

At 12:22 02-09-11, you wrote:

Hi all----

<

Jonathan

Hmmm.... then burned, thrown in a canal, left to soak for five years,
and cleaned with the garden hose? ;-)
Some inox screw may still be good, and considering the price of HP
screws those days on 'bay...

Marco IK1ODO

At 12:22 02-09-11, you wrote:

Hi all----

<>

Jonathan

Hmmm.... then burned, thrown in a canal, left to soak for five years,
and cleaned with the garden hose? ;-)
Some inox screw may still be good, and considering the price of HP
screws those days on 'bay...

Marco IK1ODO