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Measurement table is not refreshing

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Measurement table is not refreshing

Postby Serious667 » Wed Jan 31, 2018 11:18 am

Hello.
At first I would like to say hi because I'm new on forum.
I am user of PiscoScope 5442A.
I was searching for the solution on forum but I haven't found any resaults.
I make measurements of single voltage wave (so trigger is set to Single aquire) which is integrated by proper math channel. I've added some measurements like Maximum values of these signals. So i run acquire and i'm waiting for signal. After registration i write down Maximum value measurements. The problem is that when I set Run for another signal and it's acquired, the values in measurements table are not always being updated (it's random) and I have values from previous measurement. Is there any possible solution of this problem?
Below I attached example measurements (made in demo device mode)

1.png
First acquisition - proper measurements values


7.png
Second acquisition - values from previous measurement
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Re: Measurement table is not refreshing

Postby Martyn » Wed Jan 31, 2018 1:23 pm

I have tried with the current 6.12.9 version and have not been able to replicate your issue.

Can you post a psdata file for your setup, and explain the sequence you are using to change the voltage level and acquire the next trace, just in case I am doing things in a different sequence..
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Re: Measurement table is not refreshing

Postby Serious667 » Wed Jan 31, 2018 2:10 pm

At first i made an acquisition with proper measurement values (Fig.1)

1.png
Fig.1


Then when the acquisition is stopped I changed Amplitude (Fig. 2 and 3) and turned off Signal (Fig. 4) to simulate lack off signal before next acquisition.

2.png
Fig. 2
2.png (6.58 KiB) Viewed 1238 times
3.png
Fig. 3
3.png (6.44 KiB) Viewed 1238 times
4.png
Fig. 4
4.png (6.07 KiB) Viewed 1238 times


After that I started next acquisition (Fig. 5) and then turned on Signal (Fig. 6) and second triggered waveform is without updated measurements.

5.png
Fig. 5
5.png (2.95 KiB) Viewed 1238 times
6.png
Fig. 6
6.png (6.51 KiB) Viewed 1238 times


To avoid that i change trigger to None, click play and after that I come back to Single but for many measurements it's tiring and it's easy to forget to do this before every measurement.
PS:I've saved psdata file, opened it and tu my surprise measurements updated themselves to proper values. Also i've noticed that sometimes values are updating partialy.
PS2: i've got version 6.12.9.2917
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Re: Measurement table is not refreshing

Postby Martyn » Fri Feb 02, 2018 1:29 pm

That's what I was doing, so this may just be a performance bug with the demo device driver, and not something that would happen with a real device.
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Re: Measurement table is not refreshing

Postby Serious667 » Mon Feb 05, 2018 7:13 am

But it was just an example and I have the same problem with real measurements (triggering single shot, writing downn measurements, switching do Play and waiting for another waveform).
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Re: Measurement table is not refreshing

Postby Martyn » Wed Feb 07, 2018 9:40 am

A psdata file would help, then I can run tests with your exact settings for all parameters.
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Re: Measurement table is not refreshing

Postby AKH » Wed Feb 14, 2018 7:37 pm

I have a similar but different problem with PicoScope® 6 - PC Oscilloscope software version: 6.12.9.2917.

I have numerous single channel data files (*.psdata) at 16 bit resolution that were saved during an electrical noise measurement at an industrial site. I wish to now go back and analyze the data without having the instrument attached, in other words, just load the data and look it over, and use the built-in waveform measurements as tools to assess the noise environment. I generated two plot windows during the data acquisition, a time series and a spectrum.

I added three measurements to the time series window in the loaded data file using the entire captured waveform that consist of the AC RMS, Peak to Peak, and DC Average. These measurements show reasonable values in the "Value" column, but the "Min", "Max", "Average", and sigma numbers are not reflective of the waveform statistics.

I added four measurements to the spectrum window in the loaded data file. Two measurements are Frequency at Peak with the "Span" set to Peak nearest rulers 1 and 2, and two measurements are Amplitude at Peak with the "Span set to Peak nearest rulers 1 and 2. None of these measurements update in a predictable way. As a note, the "Capture Count" registers zero in all of the measurements. In some cases these measurements do not update at all, leaving blank data or "---". Sometimes this data seems to update during a data file save, but I'm not sure when or why it updates. Is there something I am doing wrong here?

I need the spectral information to complete my analysis, otherwise that portion of the data will have to be estimated manually using the positions of the cursors, tedious at best.

Please look at the attached files.

20180123-Surface to ~1100 ft-Edited.jpg
Example data image showing missing data measurements.


Thank you very much,

AKH
Attachments
Project Settings.pssettings
Scope settings file
(4.01 KiB) Downloaded 81 times
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Re: Measurement table is not refreshing

Postby AKH » Thu Feb 15, 2018 6:10 pm

After working with several *.pdata files, by opening them, adding measurements, moving the ruler markers around, saving the data with a different filename, and then reopening the saved file, I am very disappointed in the ability of the software to be able to display the same measurement data. For some reason, the capture count in the spectrum window goes to zero in various measurements after the file is reloaded. Additionally, in some of the capture buffers in some of the data files, some of the time series measurements also have a capture count of zero. The data is clearly present, because it is displayed in the windows, and the windows update when a different capture buffer is displayed.

20180123-Surfact to ~900 ft-Edited.jpg
No capture count in the spectrum window


How can I get the capture count to update properly after reopening a saved file? Is there a problem with the way I am saving my data, or operating the software?

Thanks,

AKH
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Re: Measurement table is not refreshing

Postby Martyn » Fri Feb 23, 2018 10:00 am

I would like to take a look at the actual data file for one of these captures so please can you send it to support@picotech.com
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