PicoScope 7 Software
Available on Windows, Mac and Linux
4824A Sample interval trouble with python
4824A Sample interval trouble with python
Hi.
I want to use the Picoscope 4824A via PicoSDK and Python.
I'm following the Streaming mode example, but I'm having trouble setting the sample interval.
When I use the Picoscope 7 T&M Application or look up the datasheet, the minimum sample interval that can be set is 12.5ns, but when I try to use the Streaming mode using Python, the sample interval works properly from 50ns, and the error "PICO_INVALID_SAMPLE_INTERVAL" occurs at 12.5 or 25ns.
There is another question.
I know that 4824A is a 12bit ADC, so I'm wondering why the maxADC.value returned by ps4000aMaximumValue() function is 32767 instead of 2^12 = 4096. If it is -32767 ~ 32767, it is 16bit, right?
I'll look forward to your answer.
I want to use the Picoscope 4824A via PicoSDK and Python.
I'm following the Streaming mode example, but I'm having trouble setting the sample interval.
When I use the Picoscope 7 T&M Application or look up the datasheet, the minimum sample interval that can be set is 12.5ns, but when I try to use the Streaming mode using Python, the sample interval works properly from 50ns, and the error "PICO_INVALID_SAMPLE_INTERVAL" occurs at 12.5 or 25ns.
There is another question.
I know that 4824A is a 12bit ADC, so I'm wondering why the maxADC.value returned by ps4000aMaximumValue() function is 32767 instead of 2^12 = 4096. If it is -32767 ~ 32767, it is 16bit, right?
I'll look forward to your answer.
Re: 4824A Sample interval trouble with python
In streaming mode your are limited to the maximum speed of the USB bus not the limit of the scope.
because all data is in realtime transmitted over the USB bus. (internal memory is used for short hickups int the transmission) See scope specs for max streaming sample rate.
The ADC values are factory calibrated for each scope to a range of around +/- 32000 (not 32768)
The value 32768 0x7FFF and 0x8000 are used to signal overflow of the measurement.
Benno
because all data is in realtime transmitted over the USB bus. (internal memory is used for short hickups int the transmission) See scope specs for max streaming sample rate.
The ADC values are factory calibrated for each scope to a range of around +/- 32000 (not 32768)
The value 32768 0x7FFF and 0x8000 are used to signal overflow of the measurement.
Benno
Re: 4824A Sample interval trouble with python
Check how many channels you have enabled
80 MS/s max. for a single channel using PicoSDK. 160 MS/s total across all channels.
80 MS/s max. for a single channel using PicoSDK. 160 MS/s total across all channels.
Martyn
Technical Support Manager
Technical Support Manager