Products > Test Equipment
Most (Digital-)Scopes are freezing while vertical adjustement...
tautech:
--- Quote from: Martin72 on November 15, 2022, 06:53:34 am ---Hi,
Thankyou, I already knew this more or less.
"Goal" of the Thread is to explain that this behaviour isn't a bug in the scope's software, like someone might think.
--- End quote ---
Think of it like this:
The modern DSO is a complex data acquisition system for which it makes no sense to maintain data while it is being adjusted.
To prove the point, engage Stats or a Histogram and see how user adjustments ruin the acquired results. :horse:
2N3055:
--- Quote from: noisyee on November 15, 2022, 01:39:38 am ---.............................
Keysight scopes behave more like a analog one which is always welcomed.
--- End quote ---
Or not. I couldn't care less for fake analog like emulations. It is aesthetical personal preference with no bearing to actual work in this case.
Like analog: do you think that trace should also have focus drift, and change intensity all the time while you change timebase..
JPortici:
--- Quote from: tautech on November 15, 2022, 07:08:07 am ---
--- Quote from: Martin72 on November 15, 2022, 06:53:34 am ---Hi,
Thankyou, I already knew this more or less.
"Goal" of the Thread is to explain that this behaviour isn't a bug in the scope's software, like someone might think.
--- End quote ---
Think of it like this:
The modern DSO is a complex data acquisition system for which it makes no sense to maintain data while it is being adjusted.
To prove the point, engage Stats or a Histogram and see how user adjustments ruin the acquired results. :horse:
--- End quote ---
However one could argue that since the offset is applied in the analog domain the scope doesn't *need* to stop, you need to clear the measurements.
Anyway i believe the fuss is over the fact that until the recent past most people had seen TDS2000 and simillar scopes, with 2.5kS acquisitions. Indeed it looked istantaneous, because the scope was refreshing faster than their movement. With deep acquisitions, not so much.
2N3055:
--- Quote from: JPortici on November 15, 2022, 07:51:12 am ---
--- Quote from: tautech on November 15, 2022, 07:08:07 am ---
--- Quote from: Martin72 on November 15, 2022, 06:53:34 am ---Hi,
Thankyou, I already knew this more or less.
"Goal" of the Thread is to explain that this behaviour isn't a bug in the scope's software, like someone might think.
--- End quote ---
Think of it like this:
The modern DSO is a complex data acquisition system for which it makes no sense to maintain data while it is being adjusted.
To prove the point, engage Stats or a Histogram and see how user adjustments ruin the acquired results. :horse:
--- End quote ---
However one could argue that since the offset is applied in the analog domain the scope doesn't *need* to stop, you need to clear the measurements.
Anyway i believe the fuss is over the fact that until the recent past most people had seen TDS2000 and simillar scopes, with 2.5kS acquisitions. Indeed it looked istantaneous, because the scope was refreshing faster than their movement. With deep acquisitions, not so much.
--- End quote ---
Well that is the problem: offset is not really directly applied in analog domain...
That is not a potentiometer you're turning. It is an encoder. It will reconfigure analog path, but with software in the loop... Also there is a offset DAC and with certain screen display modes, you need to recalculate offset+signal to get propper absolute values and set screen scales.. And propagate that to math and measurements.
CRTs have absolute scales, DSO can have sliding scales (0 is the center or signal is the center modes)..
Scopes that work with decimated data will be faster doing that.... Less data buffers to reconfigure..
noisyee:
--- Quote from: 2N3055 on November 15, 2022, 07:39:41 am ---
--- Quote from: noisyee on November 15, 2022, 01:39:38 am ---.............................
Keysight scopes behave more like a analog one which is always welcomed.
--- End quote ---
Or not. I couldn't care less for fake analog like emulations. It is aesthetical personal preference with no bearing to actual work in this case.
Like analog: do you think that trace should also have focus drift, and change intensity all the time while you change timebase..
--- End quote ---
Yeah, I mean response faster like an analog one is welcomed. :)
I don't think refresh in real time when change setting is that important. But some scopes always show lagging display changing setting is really annoying.
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