We have found troubling incidents regarding PicoScope and the Picoscope software. Here is the setup on how we are using the hardware and software:
PicoScope v.6 loaded onto a Win 7 laptop. The PicoScope 3224 is being attached to various test leads on a prototype device. The data is captured at various points and compared between pre and post modifications. So, let's say we are attached to point A...we take a measurement pre-modification, then take a measurement post-modification, and we are comparing the results.
We usually run pre measurements first, from points A, B, C, and D, then run the post-measurements. This might be superfloeous information, but I want to ensure we have this correct.
So, when we are taking a data point, we capture the data by hitting "STOP". The data is recorded two ways.
1. The readings from the various channels are read outloud and recorded on a paper chart. The recording person reads that value back and is double-checked again by the person actually operating the pico scope.
2. The data is then logged into the "notes" section on the Picoscope software.
Once all the data is logged on the notes section, we then do a "save current waveform as", and save it with a filename that tells us what voltage, pre or post modification, and the date.
This is repeated for all test points both pre and post modification.
So, here lies the problem, which we have just discovered and are pretty upset about!! The PicoScope software is somehow CHANGING THE DATA!!!! How is this occurring? Why is this occurring?
So, for example...
I took a data sample at point "a", pre-modification. I clicked "stop" to freeze that particular waveform. I looked on the data chart below the waveform in the PicoScope software, and read the "average" number. That was logged by my partner on the paper sheet. Let's say it was 443.8mV. He then read that back to me, and I confirmed that it was the same, 443.8mV.
I then took that number, and put it into the "notes" section of this waveform. I then Save Current Waveform..and give it a specific filename.
About an hour later, we decided to compare some of the values. I pulled up the file name, and we started noticing...several of the data sets were DIFFERENT than we had JUST RECORDED!!!! The numbers logged on the paper chart, and on the "notes" section still matched, but the numbers in the actual data area were DIFFERENT!
This is causing great concern and we are losing trust in this product. Is it something the software is doing, and if so, why? Or is it operator error? To me, once we click on "STOP", all activity should cease, and that particular waveform set should be frozen. Once saved, there should be nothing to change those values..yet they are being changed!!