TA375

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tkelly
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TA375

Post by tkelly » Wed Nov 07, 2018 7:10 pm

Hello
I was wondering if the ta375 would be helpful with can or is it more so for flex-ray speeds.I have been using regular pico leads to test can signals and it seems to work fine.What i would like is to see is if there is a difference between can signals between regular leads and high bandwith leads.If anyone has comparison shots i would love to see the difference.

Thanks
Tom

Steve Smith
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Re: TA375

Post by Steve Smith » Fri Nov 09, 2018 1:56 pm

Hi Tom, thank you for the post and sorry for the late reply.

I think the best way to cover this is to present some example waveforms as you have suggested.

I will get to this on Monday and feedback ASAP.

Could I ask Tom when measuring these networks, would you normally wish to capture a single screen/buffer containing infinite detail to view/evaluate the structure of a single data packet or........

Capture a buffer full of data (E.g. 32 waveforms) allowing you to evaluate/decode multiple data packets/ messages

I guess the answer is both but if you have some desired settings for your scope for these networks just let me know and I will capture accordingly

Take care........Steve

tkelly
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Re: TA375

Post by tkelly » Sun Nov 11, 2018 11:53 am

Hi and thanks for responding.
I am more interested in looking at a full buffer of data.
My main interest is capturing and locating faults in network communication and would the ta375 supply more definition compared to standard leads.My main question is looking at the same can network with the 2 different leads would you see an obvious difference.I am new at network diagnostics and wonder if this will help me learn or would it be better to stick with the basic leads first.

Thanks Tom

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Autonerdz
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Re: TA375

Post by Autonerdz » Sun Nov 11, 2018 11:21 pm

Tom,

Your basic test leads are perfectly fine for CAN. I believe they have a 5MHz bandwidth so you would not need the higher bandwidth probe for CAN. You would for Flex Ray though.

Steve Smith
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Re: TA375

Post by Steve Smith » Tue Nov 13, 2018 10:21 pm

Hello and thank you for your patience on this one.
Please find below a comparison of the TA375 High Impendence probe https://www.picoauto.com/products/test- ... 00-mhz-bnc
against the standard Premium 3 M Test Leads included with our PicoScope kits (TA-125 - TA-128) https://www.picoauto.com/products/test- ... A125-TA128

Both leads were connected to a BMW F31 PT CAN network at 500 kbp/s and BMW F31 FlexRay network at 10 Mbp/s. The vehicle engine was running through all tests in order to subject the networks to their typical noisy environment.

All CAN measurements using the TA375 used the x1 attenuation mode, setting the test lead bandwidth to 10 MHz

CAN using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 1 CAN 200 MS-DIV.jpg
CAN STD LEAD
CAN using TA375 High Impendence probe set to x1 attenuation (10 MHz Bandwidth)
TEST 4 CAN TA375 200 MS DIV.jpg
CAN TA375
CAN using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 2 CAN 20 US DIV.jpg
CAN STD LEAD
CAN using TA375 High Impendence probe set to x1 attenuation (10 MHz Bandwidth)
TEST 5 CAN TA375 20 US DIV.jpg
CAN TA375
CAN using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 3  CAN  20 MS 32 BUFFER.jpg
CAN STD LEAD
CAN using TA375 High Impendence probe set to x1 attenuation (10 MHz Bandwidth)
TEST 6 CAN TA375 20 MS DIV 32 BUFFER.jpg
CAN TA375
Whilst there is no doubt the TA375 presents a superior reproduction of each CAN bit with minimal “ringing”, the standard Premium 3 M Test Leads perform exceptional well with sufficient resolution to identify anomalies and accurate decoding.

All FlexRay measurements made below using the TA375 utilise the x10 attenuation mode, setting the test lead bandwidth to 100 MHz

FlexRay using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 10 FLEXRAY 200 MS DIV.jpg
FLEXRAY STD LEAD
FlexRay using TA375 High Impendence probe set to x10 attenuation (100 MHz Bandwidth)
TEST 7  FLEX TA375 200 MS DIV 2.jpg
FLEXRAY TA375
FlexRay using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 11 FLEXRAY 5 US DIV.jpg
FLEXRAY STD LEAD
FlexRay using TA375 High Impendence probe set to x10 attenuation (100 MHz Bandwidth)
TEST 8 FLEX TA375 5 US  DIV.jpg
FLEXRAY TA375
FlexRay using standard Premium 3 M Test Leads (5 MHz Bandwidth)
TEST 12 FLEXRAY 20 MS 32 BUFFERS.jpg
FLEXRAY STD LEAD
FlexRay using TA375 High Impendence probe set to x10 attenuation (100 MHz Bandwidth)
TEST 12A FLEXRAY TA375 20 MS 32 BUFFERS DC.jpg
FLEXRAY TA375
Without doubt the bandwidth of the TA375 shines through for a true representation of high frequency FlexRay signals (Baud rate 10 Mbp/s)

The errors present within the FlexRay decode for both test leads is under review and I will feedback ASAP

I hope this helps, take care……Steve

tkelly
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Joined: Sun May 06, 2018 2:45 pm

Re: TA375

Post by tkelly » Wed Nov 14, 2018 4:00 pm

I want to thank you for taking the time to put that together.I was having trouble picturing how much of a difference the higher bandwith probe would show.It seems that even can networks can benefit from using this probe.
Thanks
Tom

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