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Delta/Pulse sensor... FLS vs NPS

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01 Dec 2019 13:23 - 01 Dec 2019 18:28 #35482 by Chad
Delta/Pulse sensor... FLS vs NPS was created by Chad
I, recently, bought one of Nicholsons's Pulse Sensor. When I got it I threw it into to nearest tail pipe. Here are a few pics compared with a First Look Sensor:
Blue=FLS Red=NPS
The FLS seems to have 3x the amplitude. But, the NPS seems to have 3x the resolution.


FLS Vs NPS


NPS zoomed 3x.


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"Understanding a question is half an answer."
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01 Dec 2019 13:34 - 01 Dec 2019 14:17 #35483 by Chad
Replied by Chad on topic Delta/Pulse sensor... FLS vs NPS
I hesitate to share these next ones because I'm not sure what is going on. I need to do some more playing, before I reach a conclusion. I am interested, though, what anyone thinks about these.

The second tail pipe I put the NPS in, I saw a difference in the FLS. So, I added a WPS500. This is what I got:

Blue=First Look Sensor, Red=Nicholson's Pulse Sensor, Green=WPS500



This is with the WPS on top of the FLS vs NPS


This is with the WPS500 on top of the NPS vs FLS



Here, is all three stacked on top of each other.

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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Last edit: 01 Dec 2019 14:17 by Chad.
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01 Dec 2019 15:10 - 01 Dec 2019 15:14 #35488 by Chad
Replied by Chad on topic Delta/Pulse sensor... FLS vs NPS
This was the third tailpipe. I did this, as an after-thought, to see if there was a difference in the Banana and BNC signals...nope. It looked beautiful. This is the NPS Banana Plug and BNC vs FLS.


"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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Last edit: 01 Dec 2019 15:14 by Chad.
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01 Dec 2019 18:50 #35497 by Chad
Replied by Chad on topic Delta/Pulse sensor... FLS vs NPS
I think I found the problem. These waveforms should be a flat line. The first one is with the NPS connected using the Banana plugs. The second is with the NPS connected with a BNC cable. In each picture, I am slightly wiggling the cables where they connect to the NPS.




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"Understanding a question is half an answer."
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01 Dec 2019 18:58 #35498 by Chad
Replied by Chad on topic Delta/Pulse sensor... FLS vs NPS
Here is the same car, Exhaust, cranking. Notice the NPS has, what looks like, an extra little exhaust pulse. I believe this is a bad connection inside the NPS?



Thoughts?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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01 Dec 2019 19:15 #35500 by Michael N
Replied by Michael N on topic Delta/Pulse sensor... FLS vs NPS
You sure it's not the cable?
The cable has more of a opportunity to fail vs the internal of the sensor.
If it was a sensor fault. It would show in the details you have already posted.
I'm thinking it's the cable. Do you have another BNC cable to use.
Also note my sensors I will warranty.
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02 Dec 2019 09:35 #35515 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic Delta/Pulse sensor... FLS vs NPS
I made some home build ones real McGyver stuff I came to the conclusion the physical construction of the sensor has a huge impact on the signal, it is sensitive to the extent I don't think two identical sensors from the same manufacturer will give the exactly same waveform. In the end I bought a Ditex sensor but haven't used it much.

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