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Joule GPS User Guide page 22
CHAPTER 4: SENSORS
CALIBRATION, PowerBeam
Once you are paired with the PowerBeam Resistance Unit (RU) there are two options available to calibrate the device: Rolldown
calibration or Manual Calibration. There is also an option to reset the most recent calibration back to the factory default values.
RU Sensor
Activate Sensor
Start Pairing
Name
RU1
Sensor ID
130
Delete Sensor
Calibrate
Back to Bike
9:34A
On or Off. Typically, always On. The Auto Zero
function follows the same steps outlined for
Manual Zero but does it continually during the
ride, whenever the bike is coasting for 4 or
more seconds. If your bike is a fixed-geared
or track bicycle you may consider turning
Auto Zero off.
Calibrating or “zeroing the torque” refers to the
process of resetting the Torque Offset value of
the physical torque tube (where the internal
strain guages actually measure wheel torque).
1) Make sure the power meter is awake and
communicating with the Joule. Make sure
the bike is sitting still, no feet on pedals, no
tension in chain.
2) Select Manual Zero on Power Sensor screen.
The Calbration screen will appear. Torque
RAW should be 0. The last saved Torque
Offset is displayed. The value is typically
500-524 in-lbs.
3) Select Manual Zero on Calibration Screen.
The Torque Offset value will update with the
torque tube calibration value, given the
current environmental conditions.
RU Calibration
Roll Down
Manual
Reset to Default
Back to RU Sensor
9:34A
RU Roll Down
Back to RU Calibration
Pedal to
18-20 mph
9:34A
mph
0.0 2:00
REMAIN
RU Manual
Back to RU Calibration
Use +/- to match
RU Watts to Power
9:34A
RU WATTS
210 230
POWER
- +
Roll Down
Manual
Reset
The RU Roll Down calibration screen will flash the “Pedal to...” message until the wheel speed is in the specified range.
Once in range, the clock will begin to count down. Continue pedaling, keeping the speed in range for entire countdown.
This will allow the tire temperature and pressure to stabilize. Once the timer goes to zero. Stop pedaling and let the
wheel spin down.
Option: Select Manual calibration when another power meter is present on the bike and paired to the Joule GPS. Begin
pedaling to see power values from both the RU and the power meter.
Spend 2 minutes pedaling to warm up the tire after clamping against the roller. The vertical bar on the graphic shows
the current calibration within the acceptable range. Use the +[PLUS] and -[MINUS] buttons to increase/decrease the value
of the RU Watts until matching Power Watts. Pedal at a consistent power while calibrating. Be sure to give the RU time to
adjust with each increase/decrease.
Reset to Default will reset all values to the factory default calibration.
22


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