Noise on Log Channels

Forum for discussing PicoLog
DJETH
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Re: Noise on Log Channels

Post by DJETH »

Martyn...
Sorry for the slow response. I am currently do not have access to the hardware but I will the middle of next week. I will post the results then.
What do you want me to record on the 4 channels? How many of each item...
Capped
12 volt battery
temp sensor voltages
ECT...
Thanks DJETH

Martyn
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Re: Noise on Log Channels

Post by Martyn »

A selection will be fine, similar to the Picolog traces.
Martyn
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DJETH
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Re: Noise on Log Channels

Post by DJETH »

All,
Below is page 1 of the attached PDF document that I had to create because of the amount of data and files sizes... I am happy to get the originals to you if you can find a way for me to send you six 17MB files (although you requested only one...I am also attaching the Picolog file that I reference and in the next post I will attach the 8MB Picoscope file I also reference.


Martyn and Design Team,

I have recorded several Picoscope waveforms at the requested 500Sec per division, 5MS, 14bits and 1 buffer. I did get a sample interval of 1ms and 1000 S/sec. Each buffer is 1hr23min long and the file size is a little over 17MB each. Of course your forum website will not allow me to upload this size of file. (design team needs to be made aware of this limitation) I did get a partial that is at the end of the Picolog capture of section 7 (see next page) but is only 40 minutes long and 8MB file size that I will upload if possible.
The total Picolog is a little over 9 hours long and I have divided it to correlate with the Picoscope 6 waveforms taken at the same time the Picolog (200ms sample interval—all 4 channels) was being recorded. This ensures that there will be no mistake when the noise in the Picolog comes and goes ...“The Pattern”. I have adjusted the scaling to 20X on all the captures except section 4 capture I did screenshots of 20X, 1X, 2X, and 10X because section 4 has half noise and half “quiet” in the same capture. The 20X scaling simulates how picolog graphs (magnifies) a trace when the voltage does not change very much. You can also compare the Picoscope section 4 captures (20X, 1X, 2X, 10X) and see that without the 20X setting you cannot see the (red and blue traces) temperature voltage change hardly at all.
When you look at all the Picoscope 6 waveforms you can see there is no pattern in the Picoscope captures only in the Picolog…. Somethings wrong with Picolog. An interesting discovery… Look at the last 3 pages (12, 13, and 14) and you will see the partial capture of section 7 (which as stated above I will try to upload). I accidentally dropped my phone on the scope probe going to the red trace (temp voltage and caused a 1 second series of spikes 2.9 volts Peak to peak. You can see when this event happened in Picolog (which I indicate on the next page). Picolog shows a 37mv spike Peak to Peak for the Picoscope 2.9 volt series of spikes. This tells me that the 15mv –20 mv spikes I see in the noisy section of “The Pattern” I should see 1 volt to 2 volts of noise or spikes in the two temp sensor voltage waveforms...which can be seen is not there… Again a Picolog problem… Is there a way to correct this or filter it out….
Thanks DJETH
Attachments
Picolog vs Picoscope 8-17-2020.pdf
(1.76 MiB) Downloaded 10 times
Aug 17, 2020 3-47-17 PM.picolog
(2.19 MiB) Downloaded 12 times

DJETH
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Re: Noise on Log Channels

Post by DJETH »

Section 7 Pico Scope file
Attachments
20200816-0002 (18).psdata
(7.97 MiB) Downloaded 11 times

DJETH
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Re: Noise on Log Channels

Post by DJETH »

Martyn… Just an offer…

I would like to offer to go to Pico Technologies in Tyler Texas and take my desktop, laptop and both 5000 series scopes to test there. I could run my hardware at your facility for a day along with your team there running a their 5000 series scopes on PicoLog (recording the same items) and see if we get the same resulting pattern at 200ms – 1 sec sample intervals. Then if your team does not get the same pattern we can switch hardware and record a second day so I can narrow down the culprit. Then we can post the results here.
I am available the week of September 21 – 25. Let me know who the contact person will be and what days so I can make plans…. DJETH … I’ll bring a mask if I need too.

DJETH
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Re: Noise on Log Channels

Post by DJETH »

Bump... Just checking On the August 18th post and my offer...DJETH

Martyn
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Re: Noise on Log Channels

Post by Martyn »

Can you email in to support@picotech.com and then we can look at whether this is possible.
Martyn
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DJETH
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Re: Noise on Log Channels

Post by DJETH »

Martyn,

I emailed them and have been working with them for a couple of days... I will Keep the forum posted

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