Burst mode on PM103 using Python TLPMX.py, 200 sample max.

[esotechnic]

I'm using burst mode with an external trigger to capture power levels with a PM103 USB power meter.

It works however it seems that I cannot save more than 200 samples to the buffer. If I trigger more than 200 samples (with or without multiple samples per trigger) I receive back zeros for the power and time stamp after 200 samples. The documentation suggests a buffer of 10,000 samples that wraps so I don't think that is the issue?

It also does not seem possible to read the buffer in chunks despite the documentation suggesting this is the case, it just reads from the start every time.

Attached is a demo program to show the bug, you need to supply an external trigger to test.

Best Regards,

Graham

bug_demo.py

[esotechnic]

I did some experimentation using SCPI. I am able to fetch over 200 samples from the buffer however I did see some interesting behaviour.

For SCPI you are supposed to read 100 long blocks but at first I tried to read all 1000 I had triggered. This returned 200 tuples rather than 100 or 1000 which is quite similar to the issue I am getting with TLPMX.

I think this rules out the firmware so either it is the DLL or operator error.

Cheers,

Graham

[gboedecker]

Hello, and thank you for bringing this issue to our attention. I was able to reproduce it, and our development team will investigate it further.