Ttr ro ou ub bl le es sh ho oo ot tiin ng g – PowerTap SL User Manual
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and maximums on the PowerTap computer display. This reduces the "jumpiness" of the numbers and makes it easi-
er to use while riding.
The data saved for download is raw, exactly as it is sent to the hub.
In the CPU set up mode (press MODE and SELECT buttons simultaneously until you see 'SETUP') you can select 1
or 2 sample recording. If you select 1 the data is sent to the CPU from the hub at 1-second intervals. The 1-second
mode will save every data point sent from the hub. If you select 2 the data is sent to the CPU at 2-second inter-
vals. The 2-second mode will in effect save only every other data point sent from the hub. Therefore in the 2-sec-
ond mode Maximums can be missed.
So between the averaging and the save rate the data download will be different. In the 1-second mode the down-
load data is always most accurate.
The second issue is time differences. The data points used for display on the CPU may not coincide perfectly with
what is stored to memory. There can be up to a 1-sample (or 1-second) loss at the start and stop of a download
file. If the CPU is in 2-second mode this max time error (2-seconds at the start and/or stop) can be as much as 4-
seconds off.
The individual raw data records written to memory are extremely accurate. In fact the data has been proven in labo-
ratory testing to be accurate to +/- 1.5%. This means the data downloaded to the Link accurately represents what
was happening on your bike second by second. How we repackage the data, to make it useable does not affect or
detract from its accuracy - it's just making it more user friendly.
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The scale on both the right side and the left side of the graph consolidates several measured values and therefore
must share the common vertical axis. So, to avoid 'tall' power curves and extremely 'short' speed curves, the speed
is shown as a multiple of 10.
Sometimes interference can cause inflated values, you can change these values in the .CSV file by replacing the out
of place number with a more realistic number such as that which precedes and follows the invalid number.
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·Do not have any other applications running while doing the installation.
·If there are lots of items in the system tray turn some off or disable for the installation process.
·If there is a long pause during the installation, do not do anything. The program may be busy and a shutdown
could cause a disruption.
·There is benefit to uninstalling from the CD. If the program has been installed or partially installed and the CD is
put in and allowed to autorun, it will detect the current installation and offer the
choice to uninstall. This uninstall does a much better job of uninstalling than manually uninstalling or using the
native windows uninstall system. The Link software will often run correctly after it has
been uninstalled with the CD and then re-installed.
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The normal serial port connector is a trapezoid shape with rounded corners and has nine pins. It is about 5/8" wide
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