PicoScope 7 Software
Available on Windows, Mac and Linux
How to read from Pico Scope 2204A at a rate of 1ms continuously?
-
ananddilpico
- User
- Posts: 4
- Joined: Mon Oct 30, 2023 6:15 am
How to read from Pico Scope 2204A at a rate of 1ms continuously?
Hello all,
I have been trying to read from the Pico Scope continuously by modifying the ps2000BlockExample code by giving the run block inside a while loop and timing it. I have removed the trigger. I am getting time values above 1ms like 12 ms two to three times while running the loop, for about 10 times. Is there a way to optimize the code so that all the values come below or equal to 1ms?
I am getting time values:
0.0047 s
0.0 s
0.011s
0.001s
0.0s
0.0s
0.0s
0.0s
0.0s
0.0s
Thank you
Anand
I have been trying to read from the Pico Scope continuously by modifying the ps2000BlockExample code by giving the run block inside a while loop and timing it. I have removed the trigger. I am getting time values above 1ms like 12 ms two to three times while running the loop, for about 10 times. Is there a way to optimize the code so that all the values come below or equal to 1ms?
I am getting time values:
0.0047 s
0.0 s
0.011s
0.001s
0.0s
0.0s
0.0s
0.0s
0.0s
0.0s
Thank you
Anand
Re: How to read from Pico Scope 2204A at a rate of 1ms continuously?
If you want constant timing streaming mode is your only option.
Otherwise you always have random os delay's in the nature of the os.
Benno
Otherwise you always have random os delay's in the nature of the os.
Benno
-
ananddilpico
- User
- Posts: 4
- Joined: Mon Oct 30, 2023 6:15 am
Re: How to read from Pico Scope 2204A at a rate of 1ms continuously?
Hello,
I have tried with the streaming mode example given for the Pico Scope 2000 series (fast streaming mode) and I am still getting a high value of time while timing it for a single read of about 60 ms. I want it to do a single reading in 1ms or less.
Thank you
Anand
I have tried with the streaming mode example given for the Pico Scope 2000 series (fast streaming mode) and I am still getting a high value of time while timing it for a single read of about 60 ms. I want it to do a single reading in 1ms or less.
Thank you
Anand
Re: How to read from Pico Scope 2204A at a rate of 1ms continuously?
We will need some context to be able to advise on the best option, so
Are you trying to collect a block of x samples at a sampling rate of y and then repeat this process with a fixed time between of z
or are you trying to collect a fixed number of samples x at a sample rate of y and then stop.
It would also help if you can give a full desrciption of what data you need to collect, from where and why you need to do this.
Are you trying to collect a block of x samples at a sampling rate of y and then repeat this process with a fixed time between of z
or are you trying to collect a fixed number of samples x at a sample rate of y and then stop.
It would also help if you can give a full desrciption of what data you need to collect, from where and why you need to do this.
Martyn
Technical Support Manager
Technical Support Manager
-
ananddilpico
- User
- Posts: 4
- Joined: Mon Oct 30, 2023 6:15 am
Re: How to read from Pico Scope 2204A at a rate of 1ms continuously?
Hello,
I actually want to measure voltage values continuously through PicoScope. So I am collecting a sample of values (approx:100), taking the mean, and displaying it(this is repeated continuously). For this reason, I am opening the Pico Scope only once and running it by putting the ps2000_run_block and other functions coming after in a while loop. I am getting values but while calculating the time taken for each read in the while loop is greater than 1 ms (without including time taken for the opening of Pico Scope). I have used the ps2000Blockexample with the trigger removed which helped in reducing a lot of delay but not precisely 1ms delay.
If possible I would also like to reduce the time taken for open Pico Scope (approx: 3-4 seconds).
start=time.time()
status["openUnit"] = ps.ps2000_open_unit()
assert_pico2000_ok(status["openUnit"])
end=time.time()
print(end-start) -gives 3 -4 sec as time taken.
Thank you
Anand
I actually want to measure voltage values continuously through PicoScope. So I am collecting a sample of values (approx:100), taking the mean, and displaying it(this is repeated continuously). For this reason, I am opening the Pico Scope only once and running it by putting the ps2000_run_block and other functions coming after in a while loop. I am getting values but while calculating the time taken for each read in the while loop is greater than 1 ms (without including time taken for the opening of Pico Scope). I have used the ps2000Blockexample with the trigger removed which helped in reducing a lot of delay but not precisely 1ms delay.
If possible I would also like to reduce the time taken for open Pico Scope (approx: 3-4 seconds).
start=time.time()
status["openUnit"] = ps.ps2000_open_unit()
assert_pico2000_ok(status["openUnit"])
end=time.time()
print(end-start) -gives 3 -4 sec as time taken.
Thank you
Anand
Last edited by ananddilpico on Sun Nov 05, 2023 5:13 am, edited 1 time in total.
Re: How to read from Pico Scope 2204A at a rate of 1ms continuously?
I still think streaming is the best solution for you, set it at 100kSamples/sec so you get exactly 100 samples every 1ms. If you average every 100 samples you get then you get 1000 averages / sec.
This will be withing 0.01% of a ms for every 100 samples.
Only the OS, USB, and python will make the timing on the PC vary between 0 and 20 ms, but this is the OS not your sampling. The sampleing will still be 100samples every ms with 0.01% accurate.
Only if python can keep up with the 100000 values per second of data. (this is the biggest IF)
Benno
This will be withing 0.01% of a ms for every 100 samples.
Only the OS, USB, and python will make the timing on the PC vary between 0 and 20 ms, but this is the OS not your sampling. The sampleing will still be 100samples every ms with 0.01% accurate.
Only if python can keep up with the 100000 values per second of data. (this is the biggest IF)
Benno