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Old 9th Jul 2018, 3:24 pm   #1
John10b
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Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
Posts: 2,869
Default ISO TECH ISR 620 Oscilloscope

The above scope ISO Tech ISR620 20Mz, which I received a few weeks ago, works fine for my basic requirements.
However I have noticed that amp A has a problem on 1v/div and above, 0.5v/div and below works fine.
When using internal cal square wave on amp A it is displaying a very short time constant.
I am not familiar with or don’t have any information on this scope and would appreciate some information and advise.
The other input amp works fine on all ranges.
Cheers
John
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Old 9th Jul 2018, 5:23 pm   #2
orbanp1
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Join Date: Nov 2009
Location: London, Ontario, Canada
Posts: 673
Default Re: ISO TECH ISR 620 Oscilloscope

Hi John,

Here is a schematics, not the best, but usable (eight JPEG pictures):
https://www.eserviceinfo.com/downloa...ch_isr620.html
With the help of that you should be able to track down the error.

Good luck, Peter
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Old 9th Jul 2018, 6:15 pm   #3
John10b
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Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
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Default Re: ISO TECH ISR 620 Oscilloscope

Thank you Peter
I was able to down load the front end ok so that should help to locate problem.
Many thanks
Cheers
John
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Old 10th Jul 2018, 12:22 am   #4
orbanp1
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Default Re: ISO TECH ISR 620 Oscilloscope

Hi John,

Where it says on the page "Multipart", you select one item after the other (0...7) and then you can download them one by one.

I was able to stitch together the first three pairs quite quickly (using MS ICE), except the last two pages, those were scanned by different resolutions, one needs to work on that a bit more.

Peter
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Old 10th Jul 2018, 7:34 am   #5
John10b
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Join Date: Nov 2016
Location: Aberaeron, Ceredigion, Wales, UK.
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Default Re: ISO TECH ISR 620 Oscilloscope

Many thanks Peter for your help.
Cheers
John
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