PicoScope 7 Software
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sampling Rate with enhanced resolution
sampling Rate with enhanced resolution
Hello,
What is the maximum sampling rate of the 4000 series when enhanced resolution to 16 bits is ON.
Thanks
What is the maximum sampling rate of the 4000 series when enhanced resolution to 16 bits is ON.
Thanks
Re: sampling Rate with enhanced resolution
Hello,
after my experience there is no (direct) dependancy between sampling rate and enhanced resolution.
The enhanced resolution is only used for the display and gives a sliding average of 256 samples on the display with 4 Bit resolution enhancement. (so some kind of low pass filter for the display).
The only influence is with the maximum samples per measurement which is reduced to a maximum of (at the moment 5 Million samples per screen) if the resolution enhancement (or some other math functions) is active during acquisition. (to speed up display).
The work around would be doing the sampling (with full 100 Million samples) with deactivated enhanced resolution and then when aquisition is stopped you can activate enhanced resolution without limitation on the number of samples to smooth the display (reduce noise).
with best regards
Andreas
after my experience there is no (direct) dependancy between sampling rate and enhanced resolution.
The enhanced resolution is only used for the display and gives a sliding average of 256 samples on the display with 4 Bit resolution enhancement. (so some kind of low pass filter for the display).
The only influence is with the maximum samples per measurement which is reduced to a maximum of (at the moment 5 Million samples per screen) if the resolution enhancement (or some other math functions) is active during acquisition. (to speed up display).
The work around would be doing the sampling (with full 100 Million samples) with deactivated enhanced resolution and then when aquisition is stopped you can activate enhanced resolution without limitation on the number of samples to smooth the display (reduce noise).
with best regards
Andreas
Re: sampling Rate with enhanced resolution
Hi Andreas,
What you have mentioned is correct.
I would just add that, the width of the moving average filter is determined by the number of bits of Enhanced Resolution selected. So, you need select the number of bits that you want appropriately, to ensure that the Sample Rate is still sufficiently higher than your signal bandwidth. This is so that you avoid filtering out the higher frequencies of your displayed signal. That's why the discussion at the bottom of this page (https://www.picotech.com/library/oscill ... nhancement) refer's to "effective" sampling rate (i.e. it's what the actual sample rate has been reduced to relative to your signal bandwidth).
So Azami, the answer to your question, if you want to avoid potentially filtering out high frequencies of interest, you need to ensure that the effective sample rate is at least 5 times your signal bandwidth. For the 4000A series, which are 12-bit, you would be using an effective sample rate that, for up to 4 channels in use, would be 80mS/s divided by 256, which would be 312.5 kHz. So this would, for instance be OK for 62.5 kHz bandwidth signals (e.g. you would still get reasonably intact harmonics for a 6,25 kHz squarewaves, meaning that in the display it would still look like a squarewave).
Regards,
Gerry
What you have mentioned is correct.
I would just add that, the width of the moving average filter is determined by the number of bits of Enhanced Resolution selected. So, you need select the number of bits that you want appropriately, to ensure that the Sample Rate is still sufficiently higher than your signal bandwidth. This is so that you avoid filtering out the higher frequencies of your displayed signal. That's why the discussion at the bottom of this page (https://www.picotech.com/library/oscill ... nhancement) refer's to "effective" sampling rate (i.e. it's what the actual sample rate has been reduced to relative to your signal bandwidth).
So Azami, the answer to your question, if you want to avoid potentially filtering out high frequencies of interest, you need to ensure that the effective sample rate is at least 5 times your signal bandwidth. For the 4000A series, which are 12-bit, you would be using an effective sample rate that, for up to 4 channels in use, would be 80mS/s divided by 256, which would be 312.5 kHz. So this would, for instance be OK for 62.5 kHz bandwidth signals (e.g. you would still get reasonably intact harmonics for a 6,25 kHz squarewaves, meaning that in the display it would still look like a squarewave).
Regards,
Gerry
Gerry
Technical Specialist
Technical Specialist