Having an issue with scaling sensors

cooper2006 · Post by **cooper2006** » Tue Jul 12, 2016 2:06 pm

I am having some issues with scaling some sensors. The issue is on channels 2 and 3. They do not seem to be reading the incoming voltage signal correctly. I am measuring the return voltage using a voltage meter at the plug and getting the expected 0 to 5 volt return when stroking the sensor (linear pots); however, the system is only reading values from around 0.5 volt to 3 volts when they should be 0 to 5. I used the direct 0 to 5 scaling option to view the return voltage on the dashboard to see what the system thinks is getting returned. I replicated this process on all other channels using the same sensor and wiring setup while only moving the input wires to different channels and all other channels work correctly. Is this something that I will need to send the unit back in to be repaired? Could this possibly be a bad plug? I frequently remove and reinstall the box since the class we race in does not allow data acquisition during feature race events. We only use it during hot laps and other designated testing sessions. If I have to send it in, what is the process for doing this?

cooper2006 · Post by **cooper2006** » Thu Jul 21, 2016 3:19 pm

Hello. Anybody here? If I can't get any support for this on the forums, can someone private message me a direct phone number I can call.

Post by **brentp** » Mon Aug 22, 2016 7:01 am

Hi,

Sorry for the late reply.

If you jumper the 5v reference directly to the input port in question of your RCP, do you read 5v?

Also, is this MK1 or MK2?

cooper2006 · Post by **cooper2006** » Sun Nov 27, 2016 8:41 pm

Hi. I apologize for not responding earlier. It has been a very busy season and this has kind of been put on the back burner until things slowed down. This is the MK2. I set each channel up for 0-5v in the calibration screen. I did a direct jumper from the reference voltage on all of the channels. They all read reference (4.96v) on the RaceCapture dashboard except for channels 2 and 3. Channels 2 & 3 read 3.6. They also both change at the same time when I apply reference voltage to either one.

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Post by **brentp** » Sun Nov 27, 2016 8:49 pm

Hi, If you're certain you're measuring the raw voltage (configuration for those channels set to 'raw') and that nothing else is connected to those inputs, we may want to check out the unit. I've sent you an email.

Also, it's possible the internal calibration is off. If you know how to use a serial termial program like hyperTerminal or similar, you can issue the 'resetConfig' command to reset the unit to factory settings. Be sure to first save your current config to your local computer, of course.

Then you can see if the calibration is different after a factory reset.

Thanks, we'll get this sorted for you asap.