Questions from a Joulescope user: I want to log the current and voltage of a charging cycle of a Li-Ion battery. The charging time is about 3h. Is it possible to show the entire cycle on the screen? Is it possible to set the sampling rate? Is it possible to save the data or export images?

Hi @stasmrus and welcome to the Joulescope forum! It sounds like the script cannot open your Joulescope JS110. Does the Joulescope JS110 work with the Joulescope UI? Was the Joulescope UI still running when you ran the capture script? Only one program can open a Joulescope at a time. If the Jou…

I am able to run 4 Joulescopes at once. Thank you! Once I went for 5 or 6, though, I ran into some issues. I will post a thorough bug report soon. Thanks, again for the quick feature addition.

You definitely need to use care when running that many Joulescopes. Two considerations are USB bandwidth and power. Each Joulescope uses 8.1 MB/s when active. USB 2.0 high-speed has a theoretical max of 53,248,000 B/s (see last line of USB 2.0 spec Table 5-10): [image] However, 40 MB/s is a mu…

Hi, Is there a potential timeline for the higher-samplerate logging mentioned above? I’m trying to figure out if this device is suitable for our use case - which is about 100 Khz sample rate, for long periods of time. I’m also not sure I fully understand the functionality of the above script: I…

Hi @flyingfishfinger , welcome to the Joulescope forum, and thank you for considering Joulescope for your application! Let’s start with the basics. You can use capture.py or the standard Joulescope UI to record data to a JLS file. You can then open the JLS file in the Joulescope UI. Inside the Jo…

Hi, Thanks for the speedy reply! Is there a way to search for regions of interest (say, skip to the next data point above x or below y, show us the average for a set of cursors etc)? We can do this in Matlab, of course, but it would be nice to be able to do it without too much extra scripting. I…

The Joulescope UI does support both single markers and dual markers. It displays the statistics, including average, for the dual markers. The Joulescope UI does not include many search features today. The only search feature is Max Window, which finds the window of the specified duration with the…

I got the down_sample working but also like the max/min values. You say “Adding other statistics and configurable CSV columns should be relatively straightforward.” can you give a direction how to do this? Thanks Hans

Hi @hansvz ! My understanding is that you are asking how to add minimum current and maximum current to the downsample_logging.py example. You need to modify the on_statistics method. The _downsample_state is used to collect statistics across multiple samples, which is currently used just for mean …

HI @mliberty , thank you very much for the quick response and solution. I will test it coming days and let you know.

Hi @mliberty , I tried your script and it worked, thanks for that. I was only was missing a value in the csv file. With some investigation, I found that there was a “,” missing in the format string. self._f_csv.write(’%.7f,%g,%g,%g%.4f,%g,%g,%g\n’ % self._last) I guess it should be self._f_csv.wr…

Joulescope data logging

Technical Discussion

Topic		Replies	Views
Monitoring data while running downsample_logging.py Issues	6	759	August 17, 2020
Long monitoring/capture session Technical Discussion	2	197	March 13, 2025
Log file format? (*.jls) Technical Discussion	3	3311	August 27, 2019
Help Exporting to csv Technical Discussion	17	1640	April 1, 2025
Evaluating large measurements, afterwards and during measurement Issues	16	2187	January 15, 2021

Joulescope data logging

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