?

Yes, pressing SCOPE gets rid of the self-test display, but it also switches
between the acquired waveform (the digital side of this analog/digital
scope) which you view with the STORED button or the real time analog scope
which you view with the SCOPE button.

To see both the stored digital waveform and the real time analog waveform at
the same time press the blue "f" button then the BOTH button (which is the
same as the STORED button). BOTH is printed in blue above STORED to indicate
you activate it by first pressing the blue "f" (for function) button. Ditto
for any other labels in blue on the front panel.

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of David
Sent: Thursday, February 21, 2013 11:42 AM
To: TekScopes@...
Subject: Re: [TekScopes] Fwd: Re: [hp_agilent_equipment] e-Bay "Make offer"
- CAMERA TUBE.... OT

Immediately above and offset to the right of the "f" key in the middle of
the keyboard is a button marked "SCOPE" in the section marked "CRT DISPLAY".
It is usually the first button I press when powering the
7854 up just to get rid of the self test message.

On Thu, 21 Feb 2013 12:30:48 -0700, Dave Daniel kc0wjn@...>
wrote:

>"Scope" button? I know I need to read the manual, but I don't see a
>button labeled "Scope" (or am I being too literal here?) :)
>
>DaveD
>
>PS - You may want to post your power supply question to the TekScopes
>and TekScopes@ Yahoo groups. I have moved this response to those groups.
>
>-------- Original Message --------
>Subject: Re: [hp_agilent_equipment] e-Bay "Make offer" - CAMERA
>TUBE.... OT
>Date: Thu, 21 Feb 2013 14:15:10 -0500
>From: ChuckA chuck@...>
>Reply-To: hp_agilent_equipment@...
>To: hp_agilent_equipment@...
>
>My 7854 does the same thing, I always thought it was normal. I just
>press the "Scope" button and the "Self Test Complete" message goes away.
>
>BTW:
>Anyone have a power supply they would part with for a 7854? My second
>unit the power supply is dead and I've given up trying to fix it.

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

Yahoo! Groups Links

"Scope" button? I know I need to read the manual, but I don't see a
button labeled "Scope" (or am I being too literal here?) :)

DaveD

PS - You may want to post your power supply question to the TekScopes
and TekScopes@ Yahoo groups. I have moved this response to those groups.

-------- Original Message --------
Subject: Re: [hp_agilent_equipment] e-Bay "Make offer" - CAMERA
TUBE.... OT
Date: Thu, 21 Feb 2013 14:15:10 -0500
From: ChuckA <chuck@...>
Reply-To: hp_agilent_equipment@...
To: hp_agilent_equipment@...

My 7854 does the same thing, I always thought it was normal. I just
press the "Scope" button and the "Self Test Complete" message goes away.

BTW:
Anyone have a power supply they would part with for a 7854? My second
unit the power supply is dead and I've given up trying to fix it.

I know it's nicknamed evil-bay, but anyway, there's a 556 out there
right now. It's in Milwaukee, with Type 1A2 and CA plugins.



I have no affiliation with this seller.

--
Respectfully,
Cliff White, W5CNW
w5cnw@... <mailto:w5cnw@...>

On Thu, 21 Feb 2013 16:00:40 -0600, John Griessen
<john@...> wrote:

On 02/21/2013 12:05 PM, larrys@... wrote:

But, this part is obsolete.
> I did find some on Ebay but the seller wants $10 each. I though that was a bit pricey.
>
> At a higher sn, Tek changed the displays to MAN3620 but those are obsolete too.

maybe it's time to make an adapter board. Since the height is a close fit,
could you cut out the area of the PCB where the row of LED digits is and solder the adapter PCB in there
on the back? if so, you could make a 2 layer board for new available inexpensive LEDs.

It would be an evening of work but you could just cut a piece of
perforated board to fit and use point to point wiring with 5 x
standard 7 segment LED displays and 2 x LEDs for the overflow and
counting indicators.

The wiring is simplified since the display segment cathodes are all
wired in parallel. Find the right machined collet pins and you could
even socket the 7 segment displays.

?

Either you need new glasses or the 7854 needs new labels ;=)
2nd row 5th button
Albert

> "Scope" button? I know I need to read the manual, but I don't see a
> button labeled "Scope" (or am I being too literal here?) :)
>
> DaveD

"Scope" button? I know I need to read the manual, but I don't see a
button labeled "Scope" (or am I being too literal here?) :)

DaveD

"Scope" button? I know I need to read the manual, but I don't see a button labeled "Scope" (or am I being too literal here?) :)

DaveD

PS - You may want to post your power supply question to the TekScopes and TekScopes@ Yahoo groups. I have moved this response to those groups.


-------- Original Message --------
Subject: Re: [hp_agilent_equipment] e-Bay "Make offer" - CAMERA TUBE.... OT
Date: Thu, 21 Feb 2013 14:15:10 -0500
From: ChuckA <chuck@...>
Reply-To: hp_agilent_equipment@...
To: hp_agilent_equipment@...



My 7854 does the same thing, I always thought it was normal. I just
press the "Scope" button and the "Self Test Complete" message goes away.

BTW:
Anyone have a power supply they would part with for a 7854? My second
unit the power supply is dead and I've given up trying to fix it.

On 2/21/2013 1:31 PM, Dave Daniel wrote:

I bought a "guaranteed working" 7854 on eBay and it arrived in what was
obviously too small a box. The packaging was barely good enough to
preserve the 'scope's condition, but it appears that nothing was damaged.

The 'scope doesn't seem to work, but I may not know how to make it work
yet. It shows "Self Test Complete", but then that message never goes away.

I also purchased a 7B85A with manual, and a 7B92A. The 7B92A was
delivered, and it had a manual with it, which was a surprise. But the
bigger surprise came when the 7B85A arrived without a manual and turned
out to actually be another 7B92A. The first 7B92A that I received was
actually from the 7B85A auction. Looking more closely at the auction
photo shows a 7B92A and manual, with text describing a 7B85A. The second
7B92A was the one I knew I was buying. I now realize that there is no
such thing as a 7B85A, only a 7B85. This has had me confused for several
days. I now have two working 7B92As. Guess I didn't need a 7B85A!

DaveD


On 2/21/2013 10:47 AM, Daniel Koller wrote:

Sorry, this begs the question, what are you doing with a US camera
tube in the UK? I'm pretty sure your TV system was completely
different from ours.

Dan

________________________________
From: Paul Bicknell testeq@... <mailto:testeq%40bicknells.f2s.com>

To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

Sent: Thursday, February 21, 2013 12:34 PM
Subject: RE: [hp_agilent_equipment] e-Bay "Make offer"



Hi Dave

Sorry to hear about the smashed up equipment

Could you let the rest of us into the Sellers Name so that we don't end up
with smashed up equipment

I recently had a TV camera tube sent from the US it arrived in tact
and the right way up I was lucky

Regards Paul B South Coast UK radio@... <mailto:radio%40bicknells.f2s.com>


_____

From: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

[mailto:hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>
] On Behalf Of David Kirkby
Sent: 21 February 2013 17:06
To: hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>

Subject: Re: [hp_agilent_equipment] e-Bay "Make offer"

On 21 February 2013 15:31, Lizeth Norman normanlizeth@... <mailto:normanlizeth%40gmail.com>

wrote:
I was pointing out that some sellers are just complete idiots!

Snip

Gala

I agree. In fact some of the arguments I've had with eBay sellers has
been down to their total stupidity.

I won an auction for an HP oscillator model X. After the auction the
seller tells me he has a model Y, if I would have prefered that. I
looked up the specs of Y, found they were inferior to that of X, so I
said I wanted model X, which was what the auction was for. So what
does the idiot send me? Model Y of course.

What I found odd though, is that the stupdity of these sellers always
seems to result in me getting something inferior to what was
auctioned, rather than superior.

Packaging seems to be an issue which lets lots of sellers down. I will
not again buy an expensive/heavy bit of test kit, unless I am sure the
seller knows how to package it properly. Here is how some studid idiot
shipped an vector network analyzer from the US to the UK.


ging/badly-shipped-8753A-and-85046A.jpg

Needless to say it arrived in the UK quite smashed up, and the US
seller was less than helpful.

Dave

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

Yahoo! Groups Links






-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.2899 / Virus Database: 2639/6113 - Release Date: 02/18/13

--
See Early TV at:

www.myvintagetv.com

Sorry for taking a while to get back to you on this. It seems it is
time for me to add an S-6 manual to my binder of sampling stuff.

Here is why I do not believe the blow-by matters in this application:

When you are looking at the aberrations from a clean pulse measured by
a sampling head, instead of the impulse response which correlates with
the frequency and phase response of a linear network, you see charge
coupled through the sampling bridge from the fast edge and level
shift.

When measuring an AC signal, there are no fast edges and no DC level
shift to couple through the sampling bridge. In addition, the memory
gate is too slow to see any AC leakage. There is a simulation showing
the S-6 AC feedthrough here:



I like discussing this subject because it yields ideas for correcting
the annoying blow-by response in my S-4 sampling heads. Unfortunately
if it was easy to correct, I suspect Tektronix would have done so.

Do you actually need triggering to see just the peak to peak values? I
think you could add probe a different part of the generator circuit to
find a trigger so the leveled output could go only to the sampling
head.

On Mon, 18 Feb 2013 17:02:21 -0000, "Albert" <aodiversen@...>
wrote:

Hi David,

So far I didn't find effect of S-6 blow-by adjustment on sine wave amplitudes. I probably did something wrong, since the effect on square waves (tilt) is considerable. A change of C20 in the S-6 only causes a vertical shift of the sine wave. I tested some frequencies from 100 kHz to 1 GHz.
It's very annoying that the SG503 and my GR-type oscillators don't have a trigger output. Since the S-6 doesn't have a trigger output either I'm forced to use a CT-3 trigger pick-off and external triggering. With the S-2 I can compare internal triggering (CT-3 omitted) with such external triggering. The CT-3 has considerable effect on frequency response, about 6% to 8% downward trend when frequency is increased to 900 MHz.

Albert

--- In TekScopes@..., David <davidwhess@> wrote:

The blow-by effect on frequency response could be tested. Grossly
misadjust it deliberately and see if the frequency response changes. I
found it to be the easiest thing to calibrate on my S-4 sampling heads
so I would not worry about temporarily misadjusting it.

I would also compare two different types of sampling heads like an S-2
and S-4 which have significantly different transient response
characteristics in the 10ns range do to design and see if they agree.

I may try the above with an S-1 and S-4 and my SG503 just to see what
kind of results I get.

Taylor,

Your suggestion of the TI til302 is a good one.
The dimensions & pinout match the ones in the DC504.
The chips are only 1.4 inches thick, which is what I need.

But, this part is obsolete.
I did find some on Ebay but the seller wants $10 each. I though that was a bit pricey.

At a higher sn, Tek changed the displays to MAN3620 but those are obsolete too.

Still looking.