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Member's Forum Question of the Month: How often do you use a Handheld Oscilloscope?
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  • Handheld oscilloscope
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Related

Question of the Month: How often do you use a Handheld Oscilloscope?

vivekvelusamy
vivekvelusamy over 1 year ago

e14 Question of the Month

Engineers are on the go. Gone are the days when engineers do most of their work in the lab or on the bench. They use test equipment in the facility or at a job site, that is, out of the ordinary locations. For these settings, engineers need handheld, portable equipment to make precise, accurate measurements. Handheld oscilloscopes are the focus of this month's Question of the Month: How often do you use a Handheld Oscilloscope?

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  • dougw
    dougw over 1 year ago +3
    Some pros and cons for hand-held scopes: Hand-held Pros Portable - can be used in mobile applications Isolated - useful when you don't want the instrument grounded to mains ground Small - useful…
  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Instructorman +3
    How would you define reasonably capable? The one I have, is comparable to a 100 MHz 2 channel bench scope like the Rigol 1102 for generic use and usability (including screen resolution). Except for elaborate…
  • obones
    obones over 1 year ago +2
    As a hobbyist, I have somewhat limited resources so between the antique CRT based unmovable Telequipment D1011 scope and the DSO Shell 150, I find myself using the latter more often that not.
Parents
  • Instructorman
    Instructorman over 1 year ago

    I would use a handheld 'scope more often if I owned one.  I am currently evaluating the available product offerings, hoping to find a handheld that is both affordable and reasonably capable.

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  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Instructorman

    How would you define reasonably capable?

    The one I have, is comparable to a 100 MHz 2 channel bench scope like the Rigol 1102 for generic use and usability (including screen resolution). Except for elaborate triggering. That's more difficult on my handhold.

    Action photo: capture timer pulse of a GPS, while I try to configure the behaviour of said pulse:

    image

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  • beacon_dave
    beacon_dave over 1 year ago in reply to Jan Cumps
    Jan Cumps said:
    Except for elaborate triggering. That's more difficult on my handhold.

    A return to the old external trigger box days.

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  • Instructorman
    Instructorman over 1 year ago in reply to Jan Cumps

    I'm looking for a portable scope that can trigger on I2C and RS-232 signals.  I have been looking at the Siglent SHS800X.

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  • Instructorman
    Instructorman over 1 year ago in reply to Jan Cumps

    I'm looking for a portable scope that can trigger on I2C and RS-232 signals.  I have been looking at the Siglent SHS800X.

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  • acdc90
    acdc90 over 1 year ago in reply to Instructorman

    I have seen this question bouncing in my email box and finally decided to answer it 

    at work on the bench and in the van i have a basic 2ch digital scope which i use most days 

    maybe i use a CRT scope once a month when doing an alienment of some things 

    One workshop i went to they had a Rohde Schwarz scope but still could not get the wave i wanted.

    they were having trouble with alignment of laser cutter But with CRT was easy  

    My example is using a digital and CRT scope looking at CD player RF waveform.

    both will show the waveform But when you have a sad spindle motor 

    you won't see the fault on the digital scope.

    or doing alignment of Pioneer cd laser 

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  • michaelkellett
    michaelkellett over 1 year ago in reply to acdc90
    acdc90 said:

    My example is using a digital and CRT scope looking at CD player RF waveform.

    both will show the waveform But when you have a sad spindle motor 

    you won't see the fault on the digital scope.

    I'm intrigued , I have a couple of CRT scopes but never use them. I haven't had issues with things I can't see on a digital scope but might on an analogue for a very long time. (Although ground loop hf noise from the digital scopes can be an issue.)

    I was tempted by a Telequipment D83 on Ebay (I used one about 50 years ago !) -

    but then I remembered that I wouldn't use it Relaxed

    So I would be interested to see a situation that I might be missing .

    (The D83 is still there at £55 but it might not work !)

    MK

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  • dougw
    dougw over 1 year ago in reply to michaelkellett

    I have a Tek CRT scope permanently mounted under the shelf above my assembly bench (the permanent bit is the main reason it is still there) I use it when I don't want to drag my assembly work over to my test bench. I really like the triggering on the old Tek.

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  • shabaz
    shabaz over 1 year ago in reply to michaelkellett

    Nice-looking instrument. I still miss using the first 'scope I got familiar with, which was a Hitachi 'storage scope.

    I had to repair a Pioneer CD player the other day (30-years old!), the service manual mentioned an RF adjustment, from what I can tell it's just trying to minimize jitter, but I didn't check or adjust it, since I didn't want to touch anything if it already worked (it's my first time repairing a CD player - only did it because it was for a friend).

    A DSO would be very good for displaying this:

    image

    For the lower-frequency signals, there were adjustments like this, for the various servo adjustments; using XY mode:

    image

    There was also this interesting signal, that appears to want to align the angle of the laser/photodiode assembly, to get it to sit in the CD grating line. I didn't touch that either!

    image

    My extent of the repair was replacing all the belts, and swapping out the snapped bits (it must have been forcibly opened in the past), by using a donor non-working CD player from ebay. I also learned it's not a good idea to buy a Pioneer product with '01' in the product name suffix, e.g. model 201, 301 etc.. because they fix the issues in models 202, 302, etc. Some of the plastic parts changed from 01 to 02, but then remained the same for versions 03, 04, etc. This is obvious really, but sometimes easy to forget when purchasing products.

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  • acdc90
    acdc90 over 1 year ago in reply to shabaz

    Are yes the grating adjustment unless the laser was new then don't touch.

    and if wanted to to adjust the RF level i would clean under the lens first 

    then of course the upside down laser on the six pack cartridge where the lens would fall off

    your scan from the service manual shows the first 3 cycles  

    when looking at the waveform of sick spindle motor  it is obvious after 20+ cycles 

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  • shabaz
    shabaz over 1 year ago in reply to acdc90

    I had the separated lens issue too. It was just rattling around inside the player. I initially thought it was a stray bead from somewhere and almost threw it out : ) Lens-cleaned it, and then put it in place with a tiny bit of superglue.

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