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Old 10th Jun 2018, 9:12 am   #1
John10b
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Default Oscilloscope

Basic scope required, minimum 10mhz bandwidth, for occasional use restoring vintage Radios and Record Players.
I have a number of Test Records and I want to measure the output from the various cartridges I have collected over the years.
Cheers
John
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Old 14th Jun 2018, 11:53 am   #2
jim221
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Default Re: Oscilloscope

Hi John, for a cheap oscilloscope I don't think you can beat the miniature DS201. Hand held portable which i have used over the past few years. Costs about £70. I think it has been updated recently but it can be updated via the internet anyway.
regards
Jim
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Old 14th Jun 2018, 12:23 pm   #3
David Simpson
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Default Re: Oscilloscope

Ask around Forum folk for a decent HAMEG203 or GOULD OS300. There is a number of these ex college scopes floating around. 2 Channel/10MHz bandwidth, 1980's/90's. Should cost less than 70 quid. Avoid internet auction sites unless they offer a guaranteed return/refund package.
BVWS Swap Meets are a worthwhile option. And there are a number of Forum/BVWS folk who can repair them.

Regards, David
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Old 14th Jun 2018, 12:30 pm   #4
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Default Re: Oscilloscope

This is a textbook example of the sort of request that produces (101)n different recommendations from 101 members.... but you could do worse than search out a Philips PM3232 10MHz dual-trace, these seem to be quite common, I assume that they were a large-scale college/institution purchase way back when. All-discrete, jelly-bean transistors, good sensitivity, good triggering performance including TV line/field. Genuine 2x Y-pair CRT, so no trace-multiplexing to confuse or fail, pin-sharp and bright PDA tube, straight-forward, cool-running and (relatively!) safe Royer oscillator PSU with 24V supply option. They are quite large, though, as a result of the all-discrete circuitry and the almost OTT metal castings used in the construction but that does mean that they are easier to work on than many with higher-faluting spec.

I bought a PM3206 (15MHz, dual- (electronic multiplex) trace, single TB) for £2 the other day, mended with a new 7912 for a whopping 49p and also quite common- but its '80s all-plastic construction and close-packed PSU with mains EHT, mean that it's not one I would recommend around,

Good luck, Colin
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Old 14th Jun 2018, 7:44 pm   #5
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Default Re: Oscilloscope

Thank you all for your comments and suggestions,I will keep looking.
Cheers
John
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Old 14th Jun 2018, 8:12 pm   #6
turretslug
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Default Re: Oscilloscope

There are lots of 'scopes around at the "hobbyist" level, as lots of school physics labs, colleges etc. used them- but, a little like military surplus electronics, a selection at similar prices could encompass everything from abused and just-functioning dogs to really nice examples with many years left in them, so it takes thoughtful and eagle-eyed selection. Some (like me) quite like the challenge of a bargain that may or may not work out, others just want a to spend a bit more on a functioning tool for pressing straight into service but it's worth bearing in mind that just about any analogue CRT 'scope will have a lot of years under its belt by now. The Tek 465 probably ranks as just about the all time favourite all-rounder with excellent bandwidth and facilities- but even the newest 'B' ones are old enough to be a potential reliability headache by now, they are complex and close-packed inside and not the easiest to work on with some spares difficulties. As mentioned, I quite respect Philips 'scopes for basic facilities usage- others will doubtless differ- but there were a great many different models made for a wide price and usage range.
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Old 15th Jun 2018, 12:49 am   #7
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Default Re: Oscilloscope

Just a quick comment. "10 MHz B/W" is the response at -3 dB. If you're intending to use it for reliably measuring signal levels, it will probably be 'flat' to about only 3 MHz. (Measurement accuracy could be even less, depending on the B/W of the probe you use with it).

Al.
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Old 17th Jun 2018, 4:54 pm   #8
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Default Re: Oscilloscope

Sorted?

I have an Iwatsu DMS-510 spare. Single channel, 1us and x10 maximum sweep speed, a very, very, early DSO with negligible sample rate but basic scope works ok. FOC, just postage to pay, or collect.

Umm, don't think so, a 10MHz bandwidth scope will be good to far beyond 3MHz. Any normal scope will have peaking on the Y amplifier, and would normally be pretty flat to 9MHz or so. This is one of the nice things about a sampling scope, the Y channel has no peaking or similar, I have had an S2, rated to 4.5GHz happily displaying 10GHz, ok, 3dB down, ie half, but working well.
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Old 17th Jun 2018, 7:36 pm   #9
John10b
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Default Re: Oscilloscope

Thank you for that kind offer, I know absolutely nothing about the Iwatsu DMS 510 scope, other than what you said. I Havel looked but can find no reference to it. Is there any chance of a picture or two please.
Cheers
John
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Old 18th Jun 2018, 10:49 am   #10
woodchips
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Default Re: Oscilloscope

Photos attached.

Shows a 1MHz signal from an rf generator at 0dBm. The scope is at -3dB at 20MHz.
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Old 18th Jun 2018, 1:49 pm   #11
John10b
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Default Re: Oscilloscope

Thank you Woodchip for the pics, it looks in lovely condition but I think it is over complicated for my basic needs, so I will decline your offer, and wait for a more simpler scope to be on offer.
May I once again thank you for your time and generous offer.
Cheers
John
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Old 18th Jun 2018, 2:17 pm   #12
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Arrow Re: Oscilloscope

Quote:
Originally Posted by woodchips View Post
Umm, don't think so, a 10MHz bandwidth scope will be good to far beyond 3MHz. Any normal scope will have peaking on the Y amplifier, and would normally be pretty flat to 9MHz or so.
When you say a 'normal' 'scope, are you referring to an all-analogue type? If so, a 'scope with a stated x MHz B/W, will, in my experience, be most unlikely to have a flat response (i.e. ± 1dB) to 90% of that figure. OTOH, if you are referring to a sampling 'scope, then you may well be correct: I have only a small experience of using such-like for the reasonably accurate measurement of signal levels.

Al.
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Old 18th Jun 2018, 3:04 pm   #13
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Default Re: Oscilloscope

Think I might have an old Telequipment scope somewhere, it's a valved. It's very simple and will be easy to work on if you get a fault. I'll dig it out, see if it works and get back to you.

Andy.
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Old 18th Jun 2018, 6:31 pm   #14
John10b
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Thank you Andy
Cheers
John
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Old 22nd Jun 2018, 6:42 pm   #15
John10b
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Default Re: Oscilloscope

Got to be quick on the “Offered “ section, within about seven minutes a decent scope had been offered and sold.
I hope that Andy will be able to get his old scope working, which he has offered me.
Cheers
John
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Old 22nd Jun 2018, 9:24 pm   #16
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Default Re: Oscilloscope

Yes John, you need to be very quick. That scope was just what you needed, shame there wasn't a hat. You would have been a most deserving candidate. Free items are very soon descended on. Don't give up, I am sure you will find something.
Rob
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Old 22nd Jun 2018, 10:45 pm   #17
John10b
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Default Re: Oscilloscope

Thank you Robishack for your kind comments, it would be nice to have a scope and I will keep looking, must be quicker off the mark!
Cheers
John
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Old 22nd Jun 2018, 11:35 pm   #18
Steve_Bell
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Default Re: Oscilloscope

John,
I can offer you an Isotech ISR620 20MHz dual channel scope (originally sold through RS Components, stock no. 204-476) for £30 including postage.


Shown working with traces from the 2Vpp, 1KHz reference source; first with screen illumination off and then on.

regards,
Steve.
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Old 23rd Jun 2018, 7:26 am   #19
John10b
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Default Re: Oscilloscope

Thank you Steve I would like to accept your offer, I will let Andy know and send you a pm.
Cheers
John
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Old 23rd Jun 2018, 7:28 am   #20
mole42uk
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Default Re: Oscilloscope

Hi John, I have two or three nice, working 20MHz ‘scopes here in Bristol, any of which could be yours for the asking. PM for details if you wish.
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