Electronics > Beginners
Oscilloscope Bandwidth Question
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rstofer:

--- Quote from: tggzzz on August 02, 2019, 07:07:43 am ---If you are interested in audio, a key scope specification might be the input sensitivity, and be aware of the consequences of having a scope with an 8-bit ADC in the front end.

--- End quote ---

The 8 bit ADC is also used in some very expensive scopes, not just the entry level.  Scopes are qualitative kinds of things, not quantitative.  If you need an accurate measurement, use something else, like a DMM.  If you want to see squiggles, don't use a DMM, use a scope.

It is only the very recent scopes that have moved beyond 8 bits and they tend to be pricey.

Oddly, I can't find where Siglent has disclosed the number of ADC bits for the 1204X-E or any of the other members of the 1000 series.  Probably just my search deficiency.  But I'll bet that even the new 1204X-E is only 8 bits.  Could be wrong...

james_s:

--- Quote from: jlam on August 02, 2019, 09:24:04 am ---Thanks to everyone.

It seems like I can get by with a lot less than I thought. What would be the bare minimum I need to do this kind of work ?

--- End quote ---

The bare minimum? You'd probably be just fine with a 30 year old 15MHz analog scope, people have used much more primitive instruments than that to design and debug excellent audio gear.

With your budget I would be looking at one of the popular midrange hobbyist DSOs out there, Rigol, Siglent, that sort of thing. They will all do what you need, ask several people and you'll get as many different responses on what to get. Don't forget to leave some budget for probes and other accessories.
tautech:

--- Quote from: rstofer on August 03, 2019, 01:31:29 am ---Oddly, I can't find where Siglent has disclosed the number of ADC bits for the 1204X-E or any of the other members of the 1000 series.  Probably just my search deficiency.  But I'll bet that even the new 1204X-E is only 8 bits.  Could be wrong...

--- End quote ---
::)
In every datasheet under Vertical Resolution.
https://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2018/02/SDS1000X-E_DataSheet_DS0101E-E03C.pdf

At this time all Siglent DSO's are 8 bit and some models allow for Eres bit enhancement of a further 3 bits at the expense of sampling rate.....all X and X-E models.
0culus:

--- Quote from: james_s on August 03, 2019, 02:27:06 am ---
--- Quote from: jlam on August 02, 2019, 09:24:04 am ---Thanks to everyone.

It seems like I can get by with a lot less than I thought. What would be the bare minimum I need to do this kind of work ?

--- End quote ---

The bare minimum? You'd probably be just fine with a 30 year old 15MHz analog scope, people have used much more primitive instruments than that to design and debug excellent audio gear.

With your budget I would be looking at one of the popular midrange hobbyist DSOs out there, Rigol, Siglent, that sort of thing. They will all do what you need, ask several people and you'll get as many different responses on what to get. Don't forget to leave some budget for probes and other accessories.

--- End quote ---

Jim Williams Application Note 47 is a great read for virtually everything related to these problems. Granted his focus is CROs but he covers a lot of important territory.
rstofer:

--- Quote from: tautech on August 03, 2019, 02:28:05 am ---
--- Quote from: rstofer on August 03, 2019, 01:31:29 am ---Oddly, I can't find where Siglent has disclosed the number of ADC bits for the 1204X-E or any of the other members of the 1000 series.  Probably just my search deficiency.  But I'll bet that even the new 1204X-E is only 8 bits.  Could be wrong...

--- End quote ---
::)
In every datasheet under Vertical Resolution.
https://www.siglentamerica.com/wp-content/uploads/dlm_uploads/2018/02/SDS1000X-E_DataSheet_DS0101E-E03C.pdf

At this time all Siglent DSO's are 8 bit and some models allow for Eres bit enhancement of a further 3 bits at the expense of sampling rate.....all X and X-E models.

--- End quote ---

I knew I missed it, it's too important to omit.  I searched for 'bits' and 'ADC' but didn't give Vertical Resolution a thought.  Thanks!
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