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HOT Analogue board; Tektronix 2432

Mark
 

Hi All,


Thanks for letting me join TekScopes.

As I look around I see some familiar faces from other groups.

Hello everyone!


I have a problem with a recent acquisition from the big auction.

It is a TeK 2432.

It attracted my attention due to the fact it has GPIB.

Self Cal fails with 'hardware problem - see service manual'

It is failing self tests 7000, 8000 and 9000.

If its any help, CH2 7100 tests fail under self CAL but CH2 passes
under Self Diag.

Please see below for test result detail.

I managed to get a manual (another story) and went through the
diagnostic tree.

The clocks look good.

I did notice the TP231 in 0V, but 1.2V is present on pin 1 of the
clock switching resister packs.

I may have I got the wrong TP.

The TP I think is TP231 is placed away from the parts of the board
that use 1.2V. The one I checked is up by the PSU connector.

The only other odd thing is, everything on the analogue board gets
hot, like very hot, some chips such as the CCD are too hot to touch.

That's everything from transistor to IC is warm or hot to touch.

I have checked for abnormalities in the PSU, everything looks great.

The voltages are spot on with no ripple.

One of the outputs of the PSU is the mains trig with a lovely 50Hz
sine-wave which did give me a fright when I was looking for ripple!

Could it be some sort of high frequency oscillation on the Power
supply?

Or is this just a hot scope?

Is is likely both CCD are cactus or is it more likely its the clock
generator before the CCD?

If anyone wants to do some fault finding on this scope remotely with
me, I am all ears and eyes (and fingers)..


Best regards,

Mark
VK2HMC

Fail Tests:
7111 /CCD/CENTER/NORM-SP/CH1
7112 /CCD/CENTER/NORM-SP/CH2 PASS under self test
but FAIL under Self Cal.
7131 /CCD/CENTER/ENV-SP-SLOW/CH1
7132 /CCD/CENTER/ENV-SP-SLOW/CH2 PASS under self test but FAIL
under Self Cal.

7211 /CCD/GAIN/SHORT-PIPE/CH1-1
7212 /CCD/GAIN/SHORT-PIPE/CH1-3
7213 /CCD/GAIN/SHORT-PIPE/CH2-1
7214 /CCD/GAIN/SHORT-PIPE/CH2-3

7221 /CCD/GAIN/FISO-SLOW/CH1-1
7222 /CCD/GAIN/FISO-SLOW/CH1-3
7223 /CCD/GAIN/FISO-SLOW/CH2-1
7224 /CCD/GAIN/FISO-SLOW/CH2-3

7231 /CCD/GAIN/FISO-FAST/CH1-1
7232 /CCD/GAIN/FISO-FAST/CH1-3
7233 /CCD/GAIN/FISO-FAST/CH2-1
7234 /CCD/GAIN/FISO-FAST/CH2-3

7420 /CCD/PD-OFFSET/CH1-3
7440 /CCD/PD-OFFSET/CH2-3

8121 /PA/OFFSET/NORM-FISO/CH1
8122 /PA/OFFSET/NORM-FISO/CH2

8141 /PA/OFFSET/ENV-FISO-SLOW/CH1
8142 /PA/OFFSET/ENV-FISO-SLOW/CH2

8210 /PA/POS-GAIN/CH1
8220 /PA/POS-GAIN/CH2

8411 /PA/GAIN/50MV/CH1
8412 /PA/GAIN/50MV/CH2
8421 /PA/GAIN/20MV/CH1
8422 /PA/GAIN/20MV/CH2
8431 /PA/GAIN/10MV/CH1
8432 /PA/GAIN/10MV/CH2
8441 /PA/GAIN/5MV/CH1
8442 /PA/GAIN/5MV/CH2
8451 /PA/GAIN/2MV/CH1
8452 /PA/GAIN/2MV/CH2

8511 /PA/INV-GAIN/50MV/CH1
8512 /PA/INV-GAIN/50MV/CH2
8521 /PA/INV-GAIN/20MV/CH1
8522 /PA/INV-GAIN/20MV/CH2
8531 /PA/INV-GAIN/10MV/CH1
8532 /PA/INV-GAIN/10MV/CH2
Hmm 8541 and 8542 pass...
8551 /PA/INV-GAIN/2MV/CH1
8552 /PA/INV-GAIN/2MV/CH2

8620 /PA/VAR-MAX/CH2

8711 /PA/ATTEN-GAIN*/CH1/X1
8712 /PA/ATTEN-GAIN*/CH1/X10
8713 /PA/ATTEN-GAIN*/CH1/X100

8721 /PA/ATTEN-GAIN*/CH2/X1
8722 /PA/ATTEN-GAIN*/CH2/X10
8723 /PA/ATTEN-GAIN*/CH2/X100

9211 /TRIGS/GAIN/A-TRIG/CH1
9212 /TRIGS/GAIN/A-TRIG/CH2

9221 /TRIGS/GAIN/B-TRIG/CH1
9222 /TRIGS/GAIN/B-TRIG/CH2
tek 5304 scope with wide bar trace

 

hello, group!

oscilloscope: tek 5304
display unit: D40
horizontal unit: 5B40
vertical units: 5A38 (i have two)

settings on the horiz unit are 0.1 sec/div and auto trig on.
everything else is off. settings on the vertical units (either unit
installed in either slot or both installed or both removed) do not
vary the results.

i get a vertical bar (instead of a nice dot) that spans from the top
of the display to the bottom and about 2 divisions wide that travels
across the display in about 1 second. intensity dial on display unit
has to be turned way up to see the bar. as i turn the sec/div up bar
speed slows down, and as sec/div decreases, bar speeds up.

if i pull the horiz unit (and the vert units), i get the same bar
about 2 divisions wide and from top of display to bottom, but it
doesn't move. i get the same result if i install on a vertical unit
(either unit in either slot).

i have the manual for the 5403 and the 5B40, but not the D40 nor the
5A38. the 5441 manual seems to have the schematics for the D41
display, which appears very similar to the D40. i used these
schematics and tek's scope troubleshooting guide to "common mode" the
amp stages on the vertical amp board and saw no changes to the
display. i have verified the power board's voltages per the 5304
manual.

right before i got the bar, the scope started repeating and phase
shifting the channel 1 trace that i was measuring. very quickly after
that i got the bar.

any help would be greatly appreciated, even if it's just pointing me
in the direction of the correct section to troubleshoot. thanks, and
sorry for the long post. -chris
549 Manual Ugly and Almost Free

bobkrassa
 

I have an ugly but original manual for the Type 549 Storage
Oscilloscope that I will send for $5.00 to the first person who tells
me they want it. The $5 includes shipping by media mail. It is ugly
because the lower third looks like it got wet - before I acquired it,
and the pages are a gray color on the lower one third. But they are
not sticking. The reason I thought someone might want it is the
pictures are much more readable than in the one on BAMA and the blue on
the schematics shows up fine. So if you are working on one, you might
find it useful, if you are a collector you do not want this. If no one
wants it I will toss it. Please reply off list.
Re: old fashioned 535 - first start after 35 years

Bill R
 

Hi, Michael:

The aluminum chassis in Tek scopes has been Alodized or Anodized (I
can't remember which process is used). This process cleans the surface
and hardens it. I'm no chemist, but I think part of that process uses
potash. If you use potash to clean it I think your chassis surface will
be changed (will not look good).

Any chem heads correct me please.

Bill Roberts

michael.petereit@... wrote:

Dave,

I fond that thread but it didn't gave that conclusion.
I used alcohol for slight mud, this scope was placed in a dirty an humid cellar for years without it's coverage.

The aluminium is best cleaned by caustic potash but it will eat up tin too.
Thus I tried with a industrial cleaner which worked pretty good. In the area of the high voltage transformator I didn't used anything else than alcohol. I was afraid of getting shorts by using chemical stuff.

I try to build up ths voltage divider to measure the high voltage.

BR,
Michael
-------- Original-Nachricht --------
Datum: Sun, 04 Feb 2007 14:27:26 -0600
Von: Artek Media <manuals@...>
An: Michael Petereit <michael.petereit@...>, TekScopes@...
CC:
Betreff: Re: [Tekscopes] old fashioned 535 - first start after 35 years


Michael

For starters , do a search in the Tekscopes archives for a a long
email thread on washing and baking old scopes to get the grime out .
It may be as far back as two years ago but there was a lot of discussion.

Next I would carefully remove and mark the locations of all the
tubes, find a friend with a tube tester and test all the tubes ...

Once you have a clean dry scope and a good set of tubes time to start
tracing the circuits for bad electrolytic.. Many will suggest that
you just replace them all :-)

Does the filament on the CRT glow ? If that is dead ...you may be out
of business till you find a doaner scope

Good luck and HAVE FUN

Dave


At 02:02 PM 2/4/2007, Michael Petereit wrote:

Hi,

now I finished the repair of this pretty old scope. I switched on and
was afraid of getting "flames" out of it.
This didn't happen but even after 10 minutes running no beam appeared on
the tube.
Since the servicemanual describe resistors and capacitors with it's
number within the system the reality looks different.

I cannot measure neither 9kv voltage nor I can find the correct part
cause the scope is pretty dirty inside.

Any hints where to look first ?


Thanks,
Michael



Yahoo! Groups Links



Dave & Lynn Henderson
ArtekMedia
Digitally remastered "out of print" test equipment manuals
www.ArtekMedia.com
manuals@...
952-807-5484



Re: 500 series extender cable

Bill R
 

Hi, Dave:

The vertical signal connections are where the coax is used, plus two more for the "flipped version (580). Before the 580, they were not coax. For the rest of the connections, you can check any 540 or 580 scope schematic for the pinouts.

I have a description in a Calibration Fixtures book that I can scan that page and send you (does not include schematic). The part number for the "Fits All" version extender is: 013-055-00. Contact me off list at bill1904 at comcast dot net.

BR Bill Roberts

componenx wrote:

I've searched the archives a few times, but I haven't found a really good description of the 500 series scope extension cable. Based on what I did find (and looking at my MFs and PIs), the 93 ohm coax should be used for the signals (pins 1 and 3), with gnd connections on both ends. The "HV" lines (9-12)should be generic coax with single-
ended grounds, and everything else can be straight thru single wire. Is this correct? Would it be better to use the single ended coax on all the other lines to reduce interferance? Is there a schematic or description of a "real" Tek extender cable anywhere?
I know that 16 point to point wires will do in a pinch, but since I have the time and RG62 cable, I might as well do it right.
I saw a few posts noting that RG62 is hard to find, but I have local stock of a few different types @ .50/foot
-Dave



Yahoo! Groups Links
Re: old fashioned 535 - first start after 35 years

Stan and Patricia Griffiths
 

Hi Michel,

The only part that I know of in that scope that can be damaged by water is
the power transformer and then usually only if you submerge it in water or
use water with a lot of metal ions in it. You could always remove the power
transformer to keep it away from the water and wash the rest of the scope
with detergent and water. Warm water works best.

I have never heard of using caustic potash to clean a scope so I am not sure
how this will work. I would not do it.

Stan

-----Original Message-----
From: Michael Petereit [mailto:Michael.Petereit@...]
Sent: Friday, February 09, 2007 9:05 AM
To: Stan and Patricia Griffiths
Subject: Re: [TekScopes] Re: old fashioned 535 - first start after 35 years

Hi Stan,

well, I had really doubts thinking about changing the capacitor of this
scope. The one I bought from you seems working fine. There are a lot
more capacitor rolled in paper and with no printed value on it.
In general it's pretty hard to find any resistor or capacitor on the
scope accord to the schematics. There is no part definition printed like
on modern pcbs.
And the dirt covers really everything, especially the wiring with it's
colour scheme.
Maybe it's best first to clean this device but all post from the past
concerning this issue are not really usefull. From outting it into the
dishwasher to placing it into the bath tube and showering it... Hmmm,
it don't want to try this.
The easiest way to get rid of this dirt is caustic potash. It nags the
aluminium and the dirt very good. But without unmounting nearly every
part the cleaning won't be succesful.
I thought about changing all electircal part except of tubes and coils
and special parts at all. What do you thin about that ?

Regards,
Michael
Re: old fashioned 535 - first start after 35 years

Stan and Patricia Griffiths
 

Hi Michael,

The black capacitors I am talking about are located in the -150, +100, +225,
+350, and +500 power supplies and not in the high voltage area. You should
be able to remove and replace these capacitors without removing any other
parts. If one of the precision resistors in the power supply gets damaged,
I have some spares from scrapped old scopes.

Stan

-----Original Message-----
From: Michael Petereit [mailto:Michael.Petereit@...]
Sent: Friday, February 09, 2007 8:57 AM
To: Stan and Patricia Griffiths
Subject: Re: [TekScopes] Re: old fashioned 535 - first start after 35 years

Hi Stan,

the plugin is available and installed. Unfortunately one channel will
not work for sure since the wire of one coil is broken....
But this won't prevent the startup of the complete "vehicle".

For checking the black old capacitors I have to unsold all other
resistors above. For cleaning purpose this is the best choice but a
little bit risky too.

Thanks,
Michael

Stan and Patricia Griffiths said the following on 09.02.2007 08:00:
Hi Michael,

Something I forgot to mention that you may not know is that for the power
supplies in a 535 to work, it MUST have a plugin installed, otherwise, the
load on the power supplies will be too light and they will not regulate.

Stan
Re: 500 series extender cable

Craig Sawyers
 

I've searched the archives a few times, but I haven't found a really
good description of the 500 series scope extension cable. Based on
what I did find (and looking at my MFs and PIs), the 93 ohm coax
should be used for the signals (pins 1 and 3), with gnd
connections on
both ends.
Well, I have just taken a cover off my 012-038 500-series flexible extender,
and the cable is just 16-core plain wire. No coaxes in there at all. BUT
it is a good job I took the cover off, since there are two broken solder
joints in there with the wires just flapping. Cable length is 2 feet.

The rigid extender (013-0055-00) is different entirely. There are coaxes on
8, 9, 11, 14 and 16. All shields are linked and connected to pin 2. Also,
the shields are connected via 0.001u ceramic disc (Z5U) to pin 10. This
arrangement of shield connection is at both connectors. All other pins
(including 2 and 10) are connected with lengths of wire. The distance
between the connectors is 6".

Craig
500 series extender cable

componenx
 

I've searched the archives a few times, but I haven't found a really
good description of the 500 series scope extension cable. Based on
what I did find (and looking at my MFs and PIs), the 93 ohm coax
should be used for the signals (pins 1 and 3), with gnd connections on
both ends. The "HV" lines (9-12)should be generic coax with single-
ended grounds, and everything else can be straight thru single wire.
Is this correct? Would it be better to use the single ended coax on
all the other lines to reduce interferance? Is there a schematic or
description of a "real" Tek extender cable anywhere?

I know that 16 point to point wires will do in a pinch, but since I
have the time and RG62 cable, I might as well do it right.

I saw a few posts noting that RG62 is hard to find, but I have local
stock of a few different types @ .50/foot

-Dave
Attenuator Parts for SC504?

Howard Ashcraft
 

I have a fully functional SC504--except for the channel 2 attenuator.
The SC504 attenuator has a cam that causes individual contacts to be
pushed into contact with plugin boards containing the attenuator
resistors. The contacts are mounted on green elastic bands that are
attached to plastic carriers, three bands to a carrier. In my case,
the gold plated contacts became unglued because someone in the distant
past sprayed some solvent/contact cleaner into the assembly. Because
some of the contacts were stuck to an attenuator board, it is possible
that the board was damaged, too. Although I have been able to make
replacement contacts that have greatly improved the situation, it
still isn't correct.

So, if someone has a junk SC504, I would like to get the contacts and
the carriers and also the 4 plugin boards that are in the attenuator.
I probably can get by with 2 of the contact assemblies, if someone
only has those.

Thanks.
Re: I should know this but I want to be sure...regarding 492 SA

arthurok
 

its like a meter , reference level= full scale.
scopes are volts per division so are chart and xy recorders
division= 1 inch or 1cm on most chart or xy recorders

----- Original Message -----
From: John Miles
To: TekScopes@...
Sent: Friday, February 09, 2007 11:21 PM
Subject: RE: [TekScopes] I should know this but I want to be sure...regarding 492 SA


SAs can be confusing to a newbie, definitely. Whatever your reference level
is, that's what's at the top of the screen. So if you want to feed it a 0
dBm signal and observe it at the top line of the graticule, your reference
level would also be 0 dBm. RBW and span width should not matter because you
are looking at a CW signal and not noise or a broadband-modulated signal.
Keep your sweep time selector on AUTO and the analyzer will pick the right
RBW for a given span.

Seriously: read the ops manual, and also this:


-- john, KE5FX

> -----Original Message-----
> From: TekScopes@... [mailto:TekScopes@...]On
> Behalf Of Chris Johnson
> Sent: Friday, February 09, 2007 6:57 PM
> To: TekScopes@...
> Subject: [TekScopes] I should know this but I want to be
> sure...regarding 492 SA
>
>
> I just want to double-check some basic assumptions regarding the
> operation of a 492, or any spectrum analyzer, for that matter.
>
>
>
EPROM Programming

 

I can read/program the 74S288's without any problem.

Please feel free to contact me if you wish regarding such programming.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"
Re: EProm burner

Chuck Harris
 

I'm about 99% certain that my Advin U84 can program it. I'll have
to check. It programs virtually everything from the '90s back.

Do you have a source for blank parts?

-Chuck Harris
<j.> wrote:

The 74'288 was an OTP PAL array.
It was also sometimes listed as a 32x4 prom (functionally, the same
thing as a PAL)
It had fusible links (as already mentioned), non-reprogrammable.
Most often ordered and delivered pre-programmed by the manufacturer, but
blanks could be bought for development and low volume use.
Usually used as glue logic and address decoders in old discreet-logic
dip-chip designs (circa '70s and early '80s vintage stuff).
Also, if I remember right, very few Prom programmers in the day would
program those, only the high-end very expensive ones, or dedicated '288
programmers.
Re: I should know this but I want to be sure...regarding 492 SA

John Miles
 

SAs can be confusing to a newbie, definitely. Whatever your reference level
is, that's what's at the top of the screen. So if you want to feed it a 0
dBm signal and observe it at the top line of the graticule, your reference
level would also be 0 dBm. RBW and span width should not matter because you
are looking at a CW signal and not noise or a broadband-modulated signal.
Keep your sweep time selector on AUTO and the analyzer will pick the right
RBW for a given span.

Seriously: read the ops manual, and also this:


-- john, KE5FX

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]On
Behalf Of Chris Johnson
Sent: Friday, February 09, 2007 6:57 PM
To: TekScopes@...
Subject: [TekScopes] I should know this but I want to be
sure...regarding 492 SA


I just want to double-check some basic assumptions regarding the
operation of a 492, or any spectrum analyzer, for that matter.
Re: I should know this but I want to be sure...regarding 492 SA

 

0 dB attenuation is probably not appropriate. Each spectrum analyzer
has an optimum mixer level, usually around -30 dBm. When you set a
reference level above that point, the analyzer will want to - or may
insist on - inserting attenuation.

You should let the analyzer do as it thinks best unless you have
specific reasons to over-ride the automatic settings. Some analyzers
such as the Tek 278X units will allow you to "overdrive" the mixer
through a special menu setting.

Study some reference material on analyzers to learn why and when you
would change the analyzer's settings and how everything interacts.

For starters look for:

"Modern Spectrum Analyzer Theory and Applications" by Morris Engleson

and

"Spectrum and Network Measurements" by Robert A. Witte

You can also find much useful information on the web. Start by going
to that "other" test equipment company's web site [www.Agilent.com]
and look for application notes on spectrum analysis. AN150 and the
rest of that series comprise a very comprehensive tutorial and can be
freely downloaded.

One more thing - be aware of the absolute amplitude specification of
your signal generator. Some recent units such as Agilent's ESG series
are accurate to a half dB whereas many others may be off by 2 dB or
more and still within spec.

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

--- In TekScopes@..., "Chris Johnson" <cmjohnson@...> wrote:
Suppose I want to do a quick check of the unit's level calibration,
at the 0 dBM reference level.

Signal generator: Set to a frequency within the range of the 492,
output set to 0 dBM. Say it's 500 MHz, not that it really matter.

On the 492, sweep (time/div control) set to auto. Attenuator at 0 dB.

Now, where to set the reference level? ..."
Re: I should know this but I want to be sure...regarding 492 SA

Didier Juges
 

Chris,

There is a long and a short answer to your question. The short answer turns out to be the better one: get a copy of the service manual and go through the verification and calibration procedure.

It is logically laid out and will let you verify the instrument and recalibrate it if necessary. It will let you do that in the most logical order so that a later adjustment does not affect a previous one.

The longer answer is that there is not a single answer to your question. The calibration of an instrument such as the Tek 492 involves many circuits, input attenuator, mixer, two different IF amplifiers, 5 IF filters, variable gain video amplifier and log-video amplifier/detector. Exactly how these interact and how they are controlled by the microprocessor is not obvious and not trivial to explain, and certainly you could not figure out without the manual.

Now, you are in luck because I happen to have a copy of the Tek 492 service manual on my web site: www.ko4bb.com/ham_radio/Manuals

Didier KO4BB


Chris Johnson wrote:

I just want to double-check some basic assumptions regarding the
operation of a 492, or any spectrum analyzer, for that matter.


Suppose I want to do a quick check of the unit's level calibration, at
the 0 dBM reference level.

Signal generator: Set to a frequency within the range of the 492,
output set to 0 dBM. Say it's 500 MHz, not that it really matter.

On the 492, sweep (time/div control) set to auto. Attenuator at 0 dB.

Now, where to set the reference level? I'm asking this because I know
that the visible noise floor varies according to the span setting and
also according to the resolution bandwidth. (This unit has the 100
Hz resolution option as well as the calibrated preselector and also
digital storage, options 01, 02, and 03). Also the indicated signal
strength can be changed according to whether or not the minimum noise
option is being used, and which video filter is engaged.


So, what are the settings that I SHOULD be using to verify the
accuracy of the unit with a 0 dBM reference signal?

I know that I want the signal to peak at the top of the scale, the 0
dBM reference level. If it's properly calibrated and I'm in the right
operating mode, it'll do that.

I seek confirmation of what the settings should be for that right
operating mode.

The more detailed the info, the better. Knob by knob, setting by
setting, would be idea.

Any help would be appreciated.
Re: AM501 Stuff (op-amp references)

 

Hi Stan, It looks like the Tektronix engineer you¡¯re talking about is
a huge winner of the ¡°He who dies with the most ¡°toys¡± wins!!!¡±
contest¡­God bless him!!
Although the other part of the saying is ¡°He who dies BROKE with the
most toys wins¡±¡­ Sounds like he left his widow in good shape
financially¡­God bless him and her.

Stan, I bought some Tek Blue paint today from Patricia and if this
¡°bonanza¡± of Tek antiquities that you just acquired is what it sounds
like , I¡¯ll be buying more stuff!!

To the Group¡­. I bought some ¡°Tek Blue¡± paint from Stan and Patricia
(today) and some last fall that I used to paint/ touched up about ten
400 series cabinets with INCREDIBLE results !!!.
It¡¯s lacquer and it¡¯s stinky but what a job it does!!! If you have a
Tek scope that you ¡°love¡± buy a can of Stan and Patricia¡¯s ¡°Tek Blue¡± ¡­
highly recommended !!!!

On a different subject¡­ as usual, Deane Kidd comes up ¡°large ¡°again!!
Who else would have a ¡°timing IC Tek # 155- 0021 xx ??? that fixes a
broken 7904 so beautifully !!!
What I love about Deane the most is that you E-mail him and ask him for
a ¡°hen¡¯s tooth¡± and he replies with an email describing four different
potential Tek part numbers and then asks ¡°what color do you want?¡±

Seriously folks, we are all fortunate to have Stan and Patricia and
Deane E. Kidd as invaluable resources of Tektronix knowledge and parts!

Regards to all,

Ron Simmons

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On
Behalf Of Stan and Patricia Griffiths
Sent: Friday, February 09, 2007 10:03 PM
To: 'Ashton Brown'
Cc: TekScopes
Subject: RE: [TekScopes] Re: AM501 Stuff (op-amp references)

Hi Ashton,

You might want to watch my eBay sales for the next several weeks. I am
helping a widow dispose of a HUGE estate left by a very smart Tektronix
microwave engineer. Right now, we have 90 auctions on with lots of
terminators, adapters, attenuators, etc. and will have lots of other
stuff,
too. I have seen some of those BNC/binding post ¡°cans¡± in among the
other
stuff and I have more than I will ever use already. When I say HUGE
estate,
I mean a 2500 square foot house with a full basement absolutely FULL of
stuff . . . upstairs and down . . . you can barely walk around in it . .
.
in some cases, you can¡¯t! The stuff is packed so densely that you simply
can¡¯t see all of it until some of it gets sold. Also, there are 8
storage
lockers full and one of them is about the size of a 4 car garage. Some
of
the aisles between the shelves are packed full, too, so you can¡¯t see
all of
the stuff in the storage lockers either. This guy had ALL kinds of
stuff.
Lots of Tek. Lots of HP. Machine tools. Hand tools. Hundreds of musical
instruments. thousands of books, 6 Mercedes Benz cars. One Porsche.
Motorhome. Guns. Several early Edison phonographs and lots of wax
cylinders. Tons of parts . . . all kinds. I will not live to see the end
of this estate sale. Unfortunately, it is 40 miles from my house . . .
My
eBay name is w7ni. Take a look. I already sold the Bird wattmeter and a
nice Tek 191, sorry. Coming soon: LC130 meter, TM501, 321A, P6015 HV
probes, 109, 2710, etc. etc. Also lots of 11K mainframes and plugins and
7K, too, if I can figure out a good way to ship them. I think I¡¯ll keep
the
576 . . . The widow is keeping the 492A since that was one of the
engineer¡¯s projects. I think this guy was KING of the pack-rats.

Stan

_____

From: TekScopes@yahoogrou <mailto:TekScopes%40yahoogroups.com> ps.com
[mailto:TekScopes@yahoogrou <mailto:TekScopes%40yahoogroups.com> ps.com]
On Behalf
Of Ashton Brown
Sent: Wednesday, February 07, 2007 10:34 PM
To: Tekscopes
Subject: Re: [TekScopes] Re: AM501 Stuff (op-amp references)

Note that there are BNC adaptors on an extruded oval alloy shield which
shrouds right down to the faceplate plane (at least hP sold these -
probably others.) Wish I had a few more of these. With the shield
physically connected to the black/common binding post, you have
..almost.. a fully shielded 'can'.
Worked fine for the few-?V noise floors of the various sensitive good AC

meters du jour.

(My lovely Racal-Dana 9300, good down to Boltzmann noise and to a
phenomenal MHz top-end RMS, ~20 MHz at 6:1 crest IIRC? - natch was
already BNC equipped.) Very handy with it's output amp sent to an
accurate DC DVM, when you care about <0.1% relative levels.

Ergo "binding posts" need not be a huge handicap - anywhere near audio
freq.

Ashton

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



[Non-text portions of this message have been removed]
Re: tek 4051 computer

Dave Brown
 

----- Original Message -----
From: "Stan and Patricia Griffiths" <w7ni@...>
To: "'arthurok_2000'" <arthurok@...>
Cc: "TekScopes" <TekScopes@...>
Sent: Saturday, February 10, 2007 3:34 PM
Subject: RE: [TekScopes] tek 4051 computer


Well, yes, around here (Portland, OR) at least. I see them in estate sales
now and then and have been offered a few for free . . . but with 1500
instruments already, I just don't have the space to store them. I do have a
4052 that I made space for with several nice peripherals like external tape
drive and X-Y plotter. I just have made it a point NOT to collect 4000
series stuff.



Stan
Well, if anyone ever offers you a 4041(GPIB controller), Stan, check if it has a working boot tape with it. And if it does, then grab it and send it on. I'll be very happy to fix you up for all costs! Been chasing a boot tape for mine for a year or two now! I'd love to get a keyboard for it as well (It's a Tek special) but I think they are in rocking horse excrement land though.

DaveB, NZ
Re: AM501 Stuff (op-amp references)

Stan and Patricia Griffiths
 

Hi Ashton,



You might want to watch my eBay sales for the next several weeks. I am
helping a widow dispose of a HUGE estate left by a very smart Tektronix
microwave engineer. Right now, we have 90 auctions on with lots of
terminators, adapters, attenuators, etc. and will have lots of other stuff,
too. I have seen some of those BNC/binding post ¡°cans¡± in among the other
stuff and I have more than I will ever use already. When I say HUGE estate,
I mean a 2500 square foot house with a full basement absolutely FULL of
stuff . . . upstairs and down . . . you can barely walk around in it . . .
in some cases, you can¡¯t! The stuff is packed so densely that you simply
can¡¯t see all of it until some of it gets sold. Also, there are 8 storage
lockers full and one of them is about the size of a 4 car garage. Some of
the aisles between the shelves are packed full, too, so you can¡¯t see all of
the stuff in the storage lockers either. This guy had ALL kinds of stuff.
Lots of Tek. Lots of HP. Machine tools. Hand tools. Hundreds of musical
instruments. thousands of books, 6 Mercedes Benz cars. One Porsche.
Motorhome. Guns. Several early Edison phonographs and lots of wax
cylinders. Tons of parts . . . all kinds. I will not live to see the end
of this estate sale. Unfortunately, it is 40 miles from my house . . . My
eBay name is w7ni. Take a look. I already sold the Bird wattmeter and a
nice Tek 191, sorry. Coming soon: LC130 meter, TM501, 321A, P6015 HV
probes, 109, 2710, etc. etc. Also lots of 11K mainframes and plugins and
7K, too, if I can figure out a good way to ship them. I think I¡¯ll keep the
576 . . . The widow is keeping the 492A since that was one of the
engineer¡¯s projects. I think this guy was KING of the pack-rats.



Stan



_____

From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of Ashton Brown
Sent: Wednesday, February 07, 2007 10:34 PM
To: Tekscopes
Subject: Re: [TekScopes] Re: AM501 Stuff (op-amp references)



Note that there are BNC adaptors on an extruded oval alloy shield which
shrouds right down to the faceplate plane (at least hP sold these -
probably others.) Wish I had a few more of these. With the shield
physically connected to the black/common binding post, you have
..almost.. a fully shielded 'can'.
Worked fine for the few-?V noise floors of the various sensitive good AC
meters du jour.

(My lovely Racal-Dana 9300, good down to Boltzmann noise and to a
phenomenal MHz top-end RMS, ~20 MHz at 6:1 crest IIRC? - natch was
already BNC equipped.) Very handy with it's output amp sent to an
accurate DC DVM, when you care about <0.1% relative levels.

Ergo "binding posts" need not be a huge handicap - anywhere near audio freq.

Ashton
I should know this but I want to be sure...regarding 492 SA

Chris Johnson
 

I just want to double-check some basic assumptions regarding the
operation of a 492, or any spectrum analyzer, for that matter.


Suppose I want to do a quick check of the unit's level calibration, at
the 0 dBM reference level.

Signal generator: Set to a frequency within the range of the 492,
output set to 0 dBM. Say it's 500 MHz, not that it really matter.

On the 492, sweep (time/div control) set to auto. Attenuator at 0 dB.

Now, where to set the reference level? I'm asking this because I know
that the visible noise floor varies according to the span setting and
also according to the resolution bandwidth. (This unit has the 100
Hz resolution option as well as the calibrated preselector and also
digital storage, options 01, 02, and 03). Also the indicated signal
strength can be changed according to whether or not the minimum noise
option is being used, and which video filter is engaged.


So, what are the settings that I SHOULD be using to verify the
accuracy of the unit with a 0 dBM reference signal?

I know that I want the signal to peak at the top of the scale, the 0
dBM reference level. If it's properly calibrated and I'm in the right
operating mode, it'll do that.

I seek confirmation of what the settings should be for that right
operating mode.

The more detailed the info, the better. Knob by knob, setting by
setting, would be idea.

Any help would be appreciated.
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