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This is a new version of the Joulemeter that will undergo real-life testing in some Vehicles.
It is not a part of the official Telemetry system yet!
Currently, if your Telemetry Kit contains a JM3, it can also contain a JM2 or multiple JM3. Joulemeter 2nd gen.

Joulemeter mounting location and other considerations

  • Teams should identify a location to accommodate both Joulemeters as close as possible to eachother.
  • The LEDs of the Joulemeter must be visible when looking into the engine compartment.
  • The Joulemeter may be secured with zip ties, Velcro or another suitable method.
  • The Joulemeter “On” switch located on the top of the Joulemeter must be accessible.

Power Wiring

Wire the high current wires through both Joulemters (JM2 and JM3). It does not matter which Joulemeter is first!

Data Cable Wiring


Wire the Joulemeter data cable in series to the Liquid Flow Meter using two CAN cables and a T-Splitter mounted on to the LFM. Connect the Joulemeter as the second device in row to the Liquid Flow Meter. At the Backbone, use the connector marked „SENSOR“. For the JM3, use the USB cable for charging only! See charging instruction below.

BE & H2

Connect the JM3 data cable to the „SENSOR“ outlet of the Backbone. For the JM3, use the USB cable for charging only! See charging instruction below.


LED Measurement
Device off
«❶» Error
«❶» Initializing
«❶» Resetting Values
LED Battery
Device off
«❷» low Battery, charging
«❷» Charging
«❷» Charging Complete / Operates without battery (Blinks twice followed by pause)
Low Battery
Charge Battery soon
Battery well charged
On/Off Switch
Turn the Joulemeter on before going on track and switch it off after you returned
Reset Button
will be handled by technical team if needed

Charging the JM3

The JM3 will be supplied with a fully charged battery. If the device is only being swiched on when your vehicle is on track, the battery will last for the whole event. If it needs charging make shure your JM3 and your OBC system (Pod) are both off. Then connect the USB mini cable to any USB outlet able to deliver more than 1A of current, plug the other end to the JM3 and switch the Joulmeter on.
Now charging begins, indicated by the flashing LED. When the flashing LED turns green, the battery is almost full. If you have the time, let the charger top off the battery for an additional hour. Then unplug USB and switch off the JM3.

Charging a fully depleted battery will take about 3 hours.


Dimensions 91.25mm x 85.5mm x 36.5mm (excl. plug)
Weight g
Battery lifetime Fully charged to Low Battery > 60 min
Nominal current range ±300 A
Max. pulse current (1 sec) 1500 A
Nominal voltage range ±450 V
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student_documentation/intro/jm3.txt · Last modified: 2020/02/21 11:38 by Beni Ammann