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X-axis recording time doubled

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X-axis recording time doubled

Postby czinzu » Mon Aug 17, 2015 3:29 pm

Hello,

I have been using a Picoscope 4000 series with Picoscope 6 software for measuring data from High rate tensile material tests. I have used if successfully for several months and been getting good data.

Recently, I ran some tests at 100 in/s stroke rate and for some reason in the data I read from the picoscope the x-axis data shows scaled by 2. It shows double the time. I know this because I have 3 strain gages on my specimen and two of them are being recorded by the test machine and the third one is recorded by the picoscope. I have successfully tested at 1 in/s, 20 in/s and 50 in/s stroke rate but for 100 in/s I see this problem.

For each of the above stroke rates, I have changed the divisions and sampling rate. For 100in/s I was using 10 MS/s and 100,005 samples. The window division was 1 ms/div. I am using a single trigger with slope and trigger was set to 40 mV.

From the test machine, I deduced that the machine overshot and instead of loading at 100 in/s it was loading at 200 in/s and the specimen extends 0.2 in to failure. That tells me that my strain measurements should last 0.001 seconds which is what I get from the Test Machine. But the PicoScope data shows strain range 0.002 seconds.

Please help with this problem.

Regards,
Chandresh.
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Re: X-axis recording time doubled

Postby Hitesh » Thu Aug 20, 2015 10:01 am

Hello Chandresh,

Could you please send the PicoScope 6 (psdata) data files that correspond to the tests to support@picotech.com and we can then take a look at the settings for each of the tests at 1, 20, 50 and 100 in/s.

Regards,
Hitesh

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Pico Technology
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