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 Oscilloscopes

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FrankB
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Join date : 2010-11-22

PostSubject: Re: Oscilloscopes   July 2nd 2018, 11:10 pm

I found the Hitachi scopes were really good. I have 2 of them.
One was damaged by a co-worker who hooked it up to monitor the HOT pulse on the collector of the HOT Xistor. He did not use a X100 probe.
 Sadly, I went to use it and found the channel bad. He never admitted he screwed it up either.
 I quit loaning out my test equipment after that.  Crying or Very sad
 Tek scopes will do everything the SC61 Sencore will do, and a much lower price too. They also really back what they sell. I should have spent my bux on a Tek rather than the Sencore, but I was unaware that Tek made basically a better scope with all the same functions at a MUCH better price.
 Last I looked at a new Tek scope, they were all digital.
 I have a couple of 545 type hanger queens, an RCA and maybe a few others stashed away.
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19&41
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Join date : 2014-08-19

PostSubject: Re: Oscilloscopes   July 2nd 2018, 3:31 pm

I have a B&K 10 Mhz dual trace scope that does pretty well.  I purchased a digital laptop scope interface that I had hoped to replace it with.  It didn't work at all.  The seller didn't even want it back, he just refunded me the price and costs.  I've been leery of trying another.  There is nothing like a good scope for a multipurpose test unit.

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ve1arn
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Join date : 2010-11-23

PostSubject: Re: Oscilloscopes   June 30th 2018, 4:09 pm

I'm gonna need more than scope refreshing myself. I've been away from this too long to suit me. It's now time that I make up for lost time! Laughing
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MEZLAW
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Join date : 2012-10-28

PostSubject: Re: Oscilloscopes   June 30th 2018, 3:38 pm

I have a nice tektronix dual trace oscilloscope and a Heathkit I built 40 years ago.  I guess I should revive my skills with the o-scope and start using them again.

Embarassed
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FrankB
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Join date : 2010-11-22

PostSubject: Re: Oscilloscopes   June 28th 2018, 10:41 pm

Sal has good prices on caps. I bought a large amount from him and also Just Radios in Canada.
 Good quality parts, and reasonable prices.
 Both places offer discounts on bulk buys too.
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smyers10
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Join date : 2012-06-06

PostSubject: Re: Oscilloscopes   June 28th 2018, 2:50 pm

Cliff,
I am talking to Sal (capacitor@tuberadio.com). If he has the caps, I have an old Knight Kit KG-635 DC to 5.2 MC Oscilloscope that was given to me by a good friend. He built it and used it for a number of years. He is now a SK. Another friend (who also is a SK now) gave me the Heathkit course "How to understand and use your OSCILLOSCOPE" with the accompanying Model EF-2 Breadboard (that I need to replace the missing components) on. After I recap the O'Scope and get it working, I want to use the Heathkit course and breadboard to work my way through the book. I know that this is an old O'Scope, but it has sentimental meaning to me and  feel if I can understand this old scope, I can then use it in a meaningful way. Who knows, maybe I will even graduate up to a "big boy" scope! I feel that I will be asking questions on here from time to time.

73's
Steve
de HP9SAM
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Cliff Jones
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Join date : 2010-11-22

PostSubject: Couldn't help myself oh! oh! another O'scope    June 17th 2015, 8:59 am

Went to my local thrift store and I found a HP 130A O'scope,its limit is 300 kHz. But I found out that I can use it for  R.F. transmissions too. 

It was designed for audio, phase shift, VLF, AND vibration analysis, if I read the HP Journel right.

It's very sensitive, has triggering which for its time, beat out Dumont O'scopes, and took on Tektronix's  too!

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FrankB
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PostSubject: Re: Oscilloscopes   February 15th 2015, 4:44 pm

IIRC, You might have to adjust your probe compensation capacitor a bit. Adjustment of that varies the waveform you see.
 Possibly bad/drifting value in resistors or capacitors in the scope, or if its tube type, a gassy tube.

OTT the crystal ball says "Out to Lunch"
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CHUCKSUE
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Join date : 2015-01-03

PostSubject: Bell and Howell Model 34 Oscilloscope   February 11th 2015, 9:59 am

I am working on this scope and found that the variable sweep pot didn't have any carbon on 90% of the fiber. I replaced the pot whit another 2 MEG. and now the wave form is ok. BUT when I sync the wave form the leading edge and the trailing edge of the sign wave move up and down. I can't get it to sync completely. Any ideas on what could be causing this? When the leading edge moves up the trailing edge moves down.
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ve1arn
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Join date : 2010-11-23

PostSubject: Re: Oscilloscopes   November 19th 2012, 11:00 am

Thanks for all the links Cliff. I'll check these out later today.
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Cliff Jones
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PostSubject: Learning about controls on an Oscilloscope    November 18th 2012, 11:47 pm

Checking out an oscope
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--------------------------------
How NOT To Blow Up Your Oscilloscope!
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ewrts
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Join date : 2012-07-28

PostSubject: Re: Oscilloscopes   July 28th 2012, 8:31 am

Another good reference for older Tektronix scopes is the book "Oscilloscopes: Selecting and Restoring a Classic", by Stan Griffiths.
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Cliff Jones
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PostSubject: Here is a good lowdown on Scopes to avoid or buy   July 19th 2012, 3:27 pm

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phasedout
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Join date : 2012-06-22

PostSubject: Re: For Lovers of Tek Scopes.   July 2nd 2012, 10:57 am

Nice, reply Cliff and very interesting for us who do not know what went on inside these companies. Sounds like Tektronics were ahead in the employment field, and the way they looked after you well, and this is reflected in their outstanding products, thank,s for reply.........Alan.
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Cliff Jones
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PostSubject: Re: Oscilloscopes   June 29th 2012, 9:25 pm

Very nice link.
The Flash is better than typing word by word to get an Idea across.
I learned a few things, but alas all I have are analog scopes, all used, and low frequency. I think the highest off hand is 60MHZ or the probe freq.

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phasedout
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Join date : 2012-06-22

PostSubject: Picked up another O'scope   June 29th 2012, 11:13 am

Hi Cliff, you sound as bad as me, i must admit i love Tek Scopes, i have two monsters a 535A and a 545B, both work 100%, these need the large filter at the rear cleaned often or they can overheat. The model you have sounds a steal, its nice to pick up these scopes cheap, just the job for the collection. [You must be registered and logged in to see this link.] Another use for your scope......regards....Alan.


Last edited by phasedout on June 29th 2012, 11:18 am; edited 1 time in total (Reason for editing : To find Link.)
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Cliff Jones
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PostSubject: Re: Oscilloscopes   June 27th 2012, 9:51 am

The other nice thing about that is there are collectors and aficionados that actually sell parts and give advice on repairs. I used to work in the 500 series section in Beaverton, back in 75-76 and the quality controls and detailing were outstanding, along with employee profit share, our own Credit Union, and the Company was self reliant as to manufacturing in-house, in case of outside strikes or disruptions in deliveries of materials.

They would take a complete scope and cut out sections of the case to see the internals and view them while they were being on a shaker table, tested while powered on in ovens and freezers. That's why they stood up to the competition and became the Industrial Leader. I learned a lot from them, through the schooling they offered after hours, and bus trips to other plants during working hours. They encouraged inventions and Ideas to improve design and production. Great company all around. cheers

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phasedout
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PostSubject: For Lovers of Tek Scopes.   June 27th 2012, 4:33 am

Hi Guys, i have numerous Scopes in my collection, Tektronik Scopes being me own personal favorite, i have the 535A, Scope with plugins and the 545B on its own trolley with 4 plug in amps, its a lovely piece of equipment, the build quality is second to none. These are old Scopes and i use them during and after repair of my old Radio,s, so they go to-gether, i have the full manuals for each Scope. ...regards....Alan.
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Cliff Jones
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PostSubject: Picked up another O'scope   August 21st 2011, 11:54 pm

Went to PSARA Parking lot sale up north of Seattle, and got a Tektronix 2213 60MHz Unit.
Included with it was the service manual, and went online to get the Users manual.

$20 tongue Very Happy

Finally fired up the beast and it it looks like it works, I will test it further though.
The trace needs to be rotated yet, should be easy as there is an adjustment on the front panel as a display trace.
Downloaded the Users Manual, but My HP printer is kinda flakey.

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Cliff Jones
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PostSubject: Re: Oscilloscopes   December 8th 2010, 5:12 pm

Oscilloscopes can be very helpful in diagnosing problems with radios. You can check frequencies, voltages AC and DC, phasing, Lissajous patterns, distortion, AC voltages riding on AC (spikes)
Complex waveforms, and bandwidth.

You can check for ripple current on a DC power supply, you can see trailing and leading edges on digital pulses.
Its a versatile tool when you learn how to use it.

The range of frequencies start at DC and can go to Several Gigahertz.
They can be used as spectrum analyzers, and even checking automobile ignition and spark plug problems.

The basic device uses a Cathode ray tube to present a visible pattern, this pattern is displayed with a cross-grid so readings can be interpreted.

There are scopes that can test transistor and tube curves, show frequency spread, show shorts in wires and transmission lines, show distortion, and envelope patterns, modulation percentage, spikes, drops and analysis of signals automatically.

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Last edited by Cliff Jones on June 30th 2011, 12:18 am; edited 1 time in total (Reason for editing : more details)
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Cliff Jones
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PostSubject: Oscilloscopes   December 6th 2010, 9:39 pm

This topic will cover all aspects of using and repairs to O'scopes. If you have any problems with your Scope someone may be of help here.

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