Why does my analog data lag the built-in accelerometer data?

jeffnickel
Posts: 8
Joined: Fri Nov 06, 2015 6:01 pm
Location: Vancouver Canada

Why does my analog data lag the built-in accelerometer data?

Postby jeffnickel » Thu Jun 02, 2022 4:41 pm

Hello,
I have a DL1-Pro and am logging GPS, internal accelerometers and analog input #2 which is connected to a ribbon switch
taped over my brake pedal. While doing some braking testing I noticed that the built-in accelerometer signal reacts before
the brake pedal switch is pushed (see attached .jpg).

In the setup of the DL1 accelerometer I left all the "Maximum rate of change" and "Smoothing Filter Time" parameters set to the default "0" values.


I doubt that the car started decelerating before I hit the brake so is this an anomaly of some built-in filtering of the built-in accelerometer signals?

Thank you,

Jeff.
Long time user - love my DL2 and DL1-Pro.
Attachments
Trigger vs Accel Run 9.JPG
chart of brake switch and x-accelerometer
Trigger vs Accel Run 9.JPG (105.3 KiB) Viewed 2503 times

racetec
Site Admin
Posts: 316
Joined: Thu Oct 27, 2005 12:02 pm

Re: Why does my analog data lag the built-in accelerometer data?

Postby racetec » Wed Jun 08, 2022 11:14 am

Hello Jeff,

Please would you send your .RUN file and DL1 configuration file to service@race-technology.com

We will then investigate and get back to you.

jeffnickel
Posts: 8
Joined: Fri Nov 06, 2015 6:01 pm
Location: Vancouver Canada

Re: Why does my analog data lag the built-in accelerometer data?

Postby jeffnickel » Wed Jun 08, 2022 9:02 pm

Issue resolved. Was using the accelerometer and the GPS to calculate speed. The DL1 mounting position was rotated last minute so was using the wrong accelerometer axis for the speed calcs.

Thank you.
Jeff


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