Why does it no longer have to be calibrated?

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    Dave Hughes

    While I understand the reason for not needing to calibrate the power meter, can the values be changed to account for improved fitness? I'm assuming 180bpm will always produce x number of watts for me but over time x should increase as I get fitter/stronger. Hope that makes sense. I'm using the dual version if it makes a difference.   

  • Avatar
    Randy Galisky

    see article http://rossmalpass.co.uk/using-the-cycleops-powercal-for-serious-training/

     

    You will need to calibrate in order to capture improved power, otherwise you top out on power as your fitness level improves and harder efforts are required to produce the same level of power

  • Avatar
    Randy Galisky

    also read https://www.dcrainmaker.com/2012/11/cycleops-powercal-in-depth-review.html - see section on calibration

    and you will need free calibration software https://www.powertap.com/product/poweragent.

     

     

  • Avatar
    Randy Galisky
    User Guide for PowerCaI Heart Rate Strap
    Overview
    TH E POWERCAL SYSTEM
    The PowerCal system is a unique chest strap that is both a heart rate monitor as well as a power meter. The device measures the user's heart rate and, using a unique set of
    calibration values, calculates the user’s applied power. This information is transmitted to a handlebar or stem mounted computer that is ANT+ Power compatible. A user's
    unique calibration values are determined using a simple test and transmitted wirelessly using either the Joule computer or PowerAgent and USB ANT+ stick.
    PACKAGE CONTENTS
    1x PowerCal (CR2032 battery installed)
    1x User Guide
    Operation
    WEARING THE CHEST STRAP
    Position the PowerCal strap on your torso as shownEnsure both snaps on the strap are securely connected to the sensor. For best results lightly moisten the electrodes where
    contact is made with skin. When a heart rate signal is detected, the PowerCal wakes up and immediately begins transmitting both heart rate and power information using
    default calibration values. Note that the measured heart rate is unaffected by the calibration values.
    PAIRING TO A DISPLAY DEVICE
    PowerCal use ANT+ wireless technology to allow you to use ANT+ devices capable of displaying power. If you are using a device other than CycleOps Joule to display power,
    please consult the user guide that came with the device for the pairing process. Make sure the strap is isolated from other active sensors by 65 feet/20 meters.
    Pair to Joule as a Heart Rate Sensor: Press and release the [MODE] button until the Main menu is displayed. Select Sensors. Select Heart Rate Sensor. Select Add New Sensor.
    Select Start Pairing. Pairing may take up to 60 seconds. Once pairing is successful, the sensor ID will be displayed. It is helpful to wear the chest strap during this process.
    Pair to Joule as a Power Meter: Press and release the [MODE] button until the Main menu displayed. Select Sensors. Select Power Sensor. Select Add ANT+. Select Start Pairing.
    Pairing may take up to 60 seconds Once pairing is successful, the sensor ID will be displayed. It is helpful to wear the chest strap during this process.
    CALIBRATION USING JOULE
    A calibration is performed using a PowerTap or other power meter and the PowerCal strap to determine the user’s unique relationship between heart rate and power. The test
    can be completed on an indoor trainer or as an outdoor ride. Once this test is performed and the values are transmitted to the PowerCal strap, the PowerCal accurately operates
    in the absence of a traditional power meter.
    Pair the PowerCal strap to Joule as a Heart Rate Sensor. Pair a PowerTap or other power meter to Joule as a Power Sensor. Press and release the [MODE] button until the Main
    menu is displayed. Select Setup User. Ensure your user information is correct and scroll down and select Calculate HR W/Watt. This screen shows the current calibration values
    for this Joule user. Ensure the Enable HR W/W shows Yes. Scroll down and select Calibrate. Follow the on-screen instructions through the calibration test.
    Select Begin to start the calibration process. Throughout the test, try to maintain a relatively steady cadence. The first segment is a 5 minute warm-up to loosen up. Increase
    effort slightly when the next segment begins. Maintain a constant power for 3 minutes while maintaining a constant cadence. Increase effort level for each of the next four
    segments. Hold the power constant throughout each segment. In total, the process should take about 20 minutes. The user's unique calibration parameters are automatically
    calculated after the test is complete. Select Back to return to the Calculate HR W/Watt screen. NOTE: This procedure only alters the A and B values. To determine the C (dynamic)
    value, perform the calibration procedure below and review the data in PowerAgent.
    If the calibration was unsuccessful, make sure the PowerCal is making good connection with your chest and is paired to Joule. If conducting the calibration test in a group
    environment, try isolating yourself from other active sensors to ensure consistent wireless communication. Complete the test again after a short rest.
    The calibration values must now be transmitted to the PowerCal. Pair to the Joule as a Power Meter by pressing the [MODE] button until the Main menu is displayed. Select
    Sensors. Select Power Sensor. Select Add ANT+. Select Start Pairing. Pairing may take up to 60 seconds. Once pairing is successful, the sensor ID will be displayed. It is helpful to
    wear the chest strap during this process.
    Press the [MODE] button until the Main menu is displayed. Select Setup User. Select Calculate HR W/Watt. Remove the chest strap from your torso to allow the strap to be
    updated. The next few steps must be performed within 5 minutes of removal before the strap goes to sleep. Select Send Calibration. This screen shows the Joule user's current
    calibration (just calculated in the above steps) as well as the current calibration values in the strap. Select Update Strap to transmit the newly created calibration values to the
    strap. The Joule will display Success when the PowerCal strap has been successfully updated.
    Note: If the values show BAD DATA or the update Failed, the Joule is not effectively communicating with the strap. Make sure the strap is paired to the Joule as both a heart rate
    strap as well as a power meter and resend the calibration.
    Note: The calibration values can only be modified while the chest strap is awake, but not detecting a heart rate (i.e., not being worn). This ensures your unique calibration values
    will not be inadvertently altered while in a group environment. Once removed, the chest strap remains awake for 5 minutes before it goes to sleep to save power. The
    calibration must be updated within this 5 minute window.
    CALIBRATION USING POWERAGNENT
    A calibration is performed using a PowerTap or other power meter and the PowerCal strap to determine the user's unique relationship between heart rate and power. The test
    can be completed on an indoor trainer or as an outdoor ride. Once this test is performed and the values are transmitted to the PowerCal strap, the PowerCal accurately operates
    in the absence of a traditional power meter.
    This process is similar to the test performed using the Joule (above), but includes some sprints to determine the C (dynamic) calibration value. Data is analyzed via PowerAgent
    rather than directly on the Joule. Viewing the data within PowerAgent allows the user to more quantitatively evaluate the heart rate to power relationship and potentially
    increase overall accuracy.
    Pair the PowerCal to the Joule as a Heart Rate Sensor only. Pair the PowerTap or other power meter to the Joule as a Power Sensor. It is not necessary to be in the Calibrate
    mode within the Joule because the calibration values will be determined within PowerAgent. Complete the same 20 minute ride test as described in the Joule calibration. Now
    complete 2 short 1 minute long sprints. Rest, but remain riding for at least 2 minutes between the sprints to let your heart rate return to a reduced level. After the test,
    download the ride into PowerAgent.
    Within PowerAgent, select the calibration ride. From the Tools menu choose Smart HRS Calibration to enter the calibration screen. The calibration ride is displayed in its entirety
    as well as the current user's A, B and C calibration values. Select the ramp portion of the ride to determine the A and B parameters. The PowerCal's power data should now lie
    on top of the PowerTap's power. Adjust the slider beneath the C calibration value to control the dynamic aspect of the calibration. A higher value is more responsive when you
    change power while riding (e.g., sprints). A lower value is less responsive (power value will be smoother).
    Once the calibration values have been determined, they must now be transmitted to the PowerCal. Insert an ANT+ USB stick into the computer. Note that if Garmin ANTware
    software has been installed on the computer, it must be temporary disabled to use the ANT stick with PowerAgent. Wear the PowerCal chest strap for a few minutes to ensure it
    is turned on and transmitting. The next few steps must be performed within 5 minutes of removal before the strap goes to sleep. From the calibration screen in PowerAgent,
    press the Update button. Follow the on-screen instructions in the new window that pops up to finish updating the strap's calibration values.
    Alternatively instead of using an ANT+ USB stick, the calibration values associated with this user within PowerAgent can be uploaded onto a Joule by associating that user to the
    Joule. The Joule is then used to update the PowerCal as described in the above section.
    Operation
    CLEANING
    0 Hand wash with a damp towel and warm water.
    0 Do wash the PowerCal use a washing machine. Do not iron.
    BATTERY REPLACEMENT
    0 Using the coin or a wide blade screwdriver turn the battery cap counterclockwise one quarter turn.
    0 Remove the battery cap and replace the old battery with a new CR2032 battery. Ensure the positive (+) side faces up.
    0 Install the battery cap by turning it one quarter turn clockwise.
    TROUBLESHOOTING
    No power meter found by display.
    0 Ensure there aren't other power meter's in the immediate vicinity.
    0 Ensure the correct pairing procedure using the display's user manual.
    0 Change the CR2032 battery.
    Power seems incorrect.
    0 Calibrate the chest strap to you unique physiology and fitness
    TECHNICAL SPECIFICATIONS
    0 Accuracy: Depends on user and calibration. Typical accuracy after calibration is +-10%
    0 Signal Transmission: 2.4 GHz
    0 Operational Temperature: 0-40C/32-103F
    0 Battery Type: CR2032
    0 Battery Life: 600 Operational Hours

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