Products > Test Equipment

Need a scope, Is vertical sensitivity important?

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tautech:

--- Quote from: deezdrama on December 07, 2022, 09:44:37 pm ---
--- Quote from: tautech on December 07, 2022, 07:29:26 pm ---
--- Quote from: mwb1100 on December 07, 2022, 06:50:16 pm ---You might also consider the SDS1052DL+, available on Amazon US for about $250 at the moment:

  - https://www.amazon.com/Siglent-Technologies-SDS1052DL-Digital-Oscilloscope/dp/B01J16NV54

It's only 50MHz, but maybe it's enough for what you need?  It's not clear to me how hackable it is, but there's some indication:

  - https://www.eevblog.com/forum/testgear/siglentsds1052dlsds1102cmlhack/msg2731812/#msg2731812

I think it's the lowest-end of what Siglent currently offers for bench scopes.

But if you can stretch your budget to the SDS1202X-E - that's a far superior oscilloscope than the SDS1052DL+

--- End quote ---
100% endorse all of this ^
SDS1052DL+ will be the easier to learn with however as one advances it's minimal feature set might not meet future requirements whereas the 2ch X-E will certainly be a better match as skills grow.

deezdrama
Look up Defpom on YouTube as he reviewed a DL+ a couple weeks back for us.

--- End quote ---

Thanks guys this helps alot. I grabbed an open box 1052DL+ on amazon for $170.... Hopefully its not missing the probe or anything.
Are these possible to run off a battery pack?

--- End quote ---
They can be as they are SMPS powered but unknown is the DC requirement for the SMPS to start running.
Running scopes from a DC supply breaks the functionality of the Line trigger.

Soon I'll have a spare SMPS PSU that fits my SDS1104X-E and finding its DC start requirement will be one of our Christmas projects.

mwb1100:

--- Quote from: deezdrama on December 07, 2022, 09:44:37 pm ---I grabbed an open box 1052DL+ on amazon for $170.... Hopefully its not missing the probe or anything.

--- End quote ---

Nice!  I  didn't notice that offer.

If probes are missing you can get a couple 100MHz probes for $20 or less.  It would still be a pretty nice deal in my opinion.

Martin72:

--- Quote from: deezdrama on December 07, 2022, 05:03:02 pm ---Ive been doing maintenance on dozens of expensive 15kHz crt tv's and pro monitors...
(.....)
I need a scope!
It will be my first scope and will learn to use a scope on it.

--- End quote ---

Well, this is....remarkable. ;)
Doing repairs on TVs without scope is like driving a car with eyes closed.
Having a scope is a must, multimeters "telling" you nearly nothing.
Your planned budget is very small, but yes, forget the fnirsi/yeapook/hantek crap, at last for safety reasons.
When it´s mainly for repairs on old CRTs you wouldn´t really need a DSO, nice to have but a good old analog scope would fulfill your needs also.
The rest of your budget I would spend for a galvanic isolated transformer (or a differential probe), because chassis gnd of the TVs is NOT earthed gnd and could have high potential that will flow to earthed gnd when you use the scope( because scope gnd is earthed).
A 500VA transformer should be enough for every kind of CRT.
So a used analog scope plus transformer or when budget can be stretched, a rigol or siglent DSO plus transformer.
Or at least a differential probe.



deezdrama:

--- Quote from: Martin72 on December 07, 2022, 10:13:47 pm ---
--- Quote from: deezdrama on December 07, 2022, 05:03:02 pm ---Ive been doing maintenance on dozens of expensive 15kHz crt tv's and pro monitors...
(.....)
I need a scope!
It will be my first scope and will learn to use a scope on it.

--- End quote ---

Well, this is....remarkable. ;)
Doing repairs on TVs without scope is like driving a car with eyes closed.
Having a scope is a must, multimeters "telling" you nearly nothing.
Your planned budget is very small, but yes, forget the fnirsi/yeapook/hantek crap, at last for safety reasons.
When it´s mainly for repairs on old CRTs you wouldn´t really need a DSO, nice to have but a good old analog scope would fulfill your needs also.
The rest of your budget I would spend for a galvanic isolated transformer (or a differential probe), because chassis gnd of the TVs is NOT earthed gnd and could have high potential that will flow to earthed gnd when you use the scope( because scope gnd is earthed).
A 500VA transformer should be enough for every kind of CRT.
So a used analog scope plus transformer or when budget can be stretched, a rigol or siglent DSO plus transformer.
Or at least a differential probe.

--- End quote ---


I worked on cars my whole life untill getting a decent scanner 6 or 7 years ago, but yeah your right it usually involved alot of educated guesses and throwing parts at things untill they ran lol.

With crt's ive found 9 out of 10 times its a bad/dry electrolytic capacitor in the deflection circuit that causes issues or protection shutdown of high voltage from the flyback transformer...... But...... That 1 out 10 i definitely been shotgunning at blind lol

I ended up ordering a Siglent SDS1052DL+, found an open box for $170 so jumped on it.
Sounds like it will be decent to learn on and if I need to upgrade in a year or so I can probably recover most of the $170 spent.

Those cheap aliexpress scopes had one thing that appealed to me.... Being battery powered and floating from the device being worked on. Ive read mention a ton of times about needing an isolation transformer but never looked into it a whole lot. So this is wise to use 100% of the time?
I thought I read it was vital for pre 1980s crt's that had live chassis..... All the monitors I work on are 1990 or newer, is it still vital to use isolation? I didnt plan to have to buy an isolation transformer as well, maybe I should of spent a little more on a decent portable scope?

james_s:
I repaired CRT TVs and monitors for many years without a scope, most of the time I found shorted transistors, bad capacitors, sometimes an open resistor, a scope does make things easier though.

Don't forget to watch Dave's video on how to not blow up your scope. Many TV sets use a hot chassis design, most monitors (except older arcade monitors) don't but the power supply section will.

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