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'[OT]: Tektronix O-Scope'
2002\01\13@221423 by Barry Michels

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I just got a model 564 dual-trace scope (a local college was throwing it
away).  This thing probably weighs around 100 lbs or more!

Any idea how to calibrate it?  There's no manual...


Thanks

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2002\01\13@231435 by B. Paul Degnan

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> Any idea how to calibrate it?  There's no manual...
Take the case off, and there should be the schematics, as well as some
test vector lists pasted to the lid.  I should ( or mine did) have
information on calibrations, and what to turn.

--B. Paul Degnan

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2002\01\14@094127 by James Paul

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Guys,

My advice would be to send it out to a calibration facility that is local
to you.   It shouldn't cost more than a hundred dollars or so, and you'll
have a warranty.  Think of it as the purchase price since you saved it
from the dumpster anyway.   I've seen several scopes that had to be sent
out because the owner/operator thought they could save a few bucks by
doing it themselves.   They could have saved themselves a lot of time and
money if they would have let a cal shop do it in the first place.

I'm not saying tht you're not competant enough to do the job, but the cal
shop has the equipment, procedures, and facility to do it in short order.
I'm almost certain that you don't have all the suggested or required
equipment to do it the right way.

But you're the owner and you can do wahtever you like.   Just a little
friendly advice, that's all.


                                           Regards and Good Luck,

                                                    Jim




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2002\01\14@095519 by J.Feldhaar

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Hi Barry,

I'm a TEK nut myself, and have just remembered that I have a copy of
this service manual. I could copy and fax the relevant pages, you can
then decide to do or not to do it.

Apart from this: To completely calibrate an oscilloscope is not an easy
undertaking (ask me, I was a developer for years), and even if you have
all the necessary gadgets at hand.
OTOH, the scope is a TEK, one of the finest, and most of mine work very
well even after 40 service years. So instead of calling it a
full-fledged calibration you can very easily check on timing and voltage
levels displayed. Another easy test is to measure the supply voltages.

Even TEK makes a distinct difference between a functional check and a
complete calibration!

My 0.02 EURO... :-)

Greets
Jochen Feldhaar DH6FAZ


Barry Michels schrieb:
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2002\01\14@173749 by Barry Michels

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That would be great!

I don't think it requires a full calibration.  When I put in 5V, it showed
up as 2.4V (not quite 2.5 div when on 1V/div) on the scale.  There is a
calibrator section with a volts dial and a 'Cal.Out' BNC connector....
I was just looking for basic instructions to make sure the voltage scale is
correct.  I have another scope that I could cross check with to double check
timing.

Barry

{Original Message removed}

2002\01\15@135828 by steve

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> So instead of calling it a full-fledged calibration you
> can very easily check on timing and voltage levels displayed.

I agree. IMHO, far too much emphasis is placed on calibrating
scopes. How many times do you actually use a scope for an
absolute measurement ? Almost never. One where you need the
calibration level of accuracy ? Less than that.

When you consider the width of the trace to the height of the
screen, you're only seeing about 7 or 8 bits worth of resolution and
then you are eyeballing that.

Your money can be better spent on decent probes which is
something where it does matter for general use.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: spam_OUTstevebTakeThisOuTspamtla.co.nz      fax +64 9 820-1929
======================================================

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2002\01\15@211851 by Barry Gershenfeld

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>I don't think it requires a full calibration.  When I put in 5V, it showed
>up as 2.4V (not quite 2.5 div when on 1V/div) on the scale.

For most equipment, and especially the good stuff, a calibration
would correct errors of 5 or 10 percent.  If it's 'way off, then
it would likely need repairs instead.   BTW make sure you have
that red center knob on the volts range clicked all the way
to the right or else you aren't measuring anything accurately.

>There is a
>calibrator section with a volts dial and a 'Cal.Out' BNC connector....
>I was just looking for basic instructions to make sure the voltage scale is
>correct.  I have another scope that I could cross check with to double check
>timing.

The real purpose of most calibrators is to let you adjust the probe
compensation so that square waves look square.   I'm not used to
seeing calibrated voltage sources but I guess yours has one.  I
don't have any firsthand experience with this model.

Barry

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2002\01\16@073356 by J.Feldhaar

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Barry Gershenfeld schrieb:
{Quote hidden}

Hi Barry,

most modern TEK scopes (well, as of 10 years ago...still analog)
featured a calibrator that changed frequency with the timebase knob, and
most of the other ones have a precisely defined amplitude into so-and-so
impedance. Absolute frequency is not always important, but a fast and
well behaved switching the square wave lets you check the entire
vertical amplifier for correct bandwidth and compensation.
Hameg (B+C in the US, IIRC) has less than 5 nsec of risetime, so you can
verify even a 100 MHz scope easily.....

Greets Jochen
>
> Barry
>
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2002\01\16@073432 by J.Feldhaar

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Hi Barry,

you could send me your fax number, and tomorrow (er, at the company) I
could prepare copies and fax them to you.

Scanning is not possible at the moment, and to convert them into PDFs
with a trick will make one very BIG Email...

Greets Jochen

Barry Michels schrieb:
{Quote hidden}

> {Original Message removed}

2002\01\16@125839 by John Ferrell

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Don't get too proud of it. I have bought 453's (50Mhz, portable) on EBAY for
less than $75.

I won't even try to explain why I have so many Tek Scopes. I wonder why
myself...

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



{Original Message removed}

2002\01\17@090530 by Roman Black

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Steve Baldwin wrote:
>
> > So instead of calling it a full-fledged calibration you
> > can very easily check on timing and voltage levels displayed.
>
> I agree. IMHO, far too much emphasis is placed on calibrating
> scopes. How many times do you actually use a scope for an
> absolute measurement ? Almost never. One where you need the
> calibration level of accuracy ? Less than that.
>
> When you consider the width of the trace to the height of the
> screen, you're only seeing about 7 or 8 bits worth of resolution and
> then you are eyeballing that.
>
> Your money can be better spent on decent probes which is
> something where it does matter for general use.

I agree! :o)
Here's a thought, put your CRO on XY setting
and turn both the position knobs. If you have
fast fingers it's an "etch a sketch"!
;o)
-Roman

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2002\01\17@105055 by J.Feldhaar

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Roman Black schrieb:
{Quote hidden}

Hi Roman,

if you do it on a old analog storage scope with fullest brightness, IT
WILL etch the sketch (permanently...hehehe...)

Greets
Jochen Feldhaar DH6FAZ

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