H2I Accuracy2 User manual

Accuracy2
User Guide
www.h2i.ch18|11|21 Version N°1.0H2i SA, 2017 Boudry, SwitzerlandCopyright © 2021 H2i Sàrl
1. Measuring a watch with ONEOF Accuracy2
If the watch is equipped with a screw-down system, unlock the crown.
Fully wind the watch by turning the crown clockwise.
Place the watch on the sensor.
The crown should be placed in the center of the ONEOF logo.
The App detects the presence of the watch and starts its initializing process.
The frequency is automatically computed after a few seconds only.
The accuracy of the watch is displayed at the top of the screen after 2 to 60s,
depending on the time integration chosen in the settings.
The measurement will continue unless the watch is removed from the sensor.

2. The vibrograph chart display
Swipe right to display the “Vibrograf” chart, historically used by watchmakers
where each dot represents a tick or a tock over time and formed of two lines.
If the watch tends to run faster, the slopes are positive.
If the watch tends to run slower, the slopes are negative.
If the watch is perfectly accurate, the chart displays flat lines.
In case the watch has no beat error, the two lines are superimposed. If the beat
error is greater than 0.0ms, the lines are spaced. The bigger the beat error, the
larger the space between the lines.
Stable & accurate watch running
slightly faster with low beat error.
Inaccurate vintage watch or noisy
environnement.
Increase the integration time for an
improved rate stability result.
Watch gaining hundreds of seconds
per day. Might be magnetized.
Accuracy2User Guide 2|4
www.h2i.ch18|11|21 Version N°1.0H2i SA, 2017 Boudry, SwitzerlandCopyright © 2021 H2i Sàrl

4. Adjusting the sensor sensitivity / gain.
In rare cases, the sensor input gain, or sensitivity, needs to be adjusted in
order to improve the measurement stability. It usually happens with very noisy
movements, mainly 2.5Hz vintage ones, or when the measurement is done in a
noisy environment.
Touch the 3 dots button located on the top navigation bar, then touch the
Gain button. A slider appears below the signal escapement. Adjust the gain
accordingly in order to obtain the 3 peaks.
The gain is too low.
The rate accuracy may fluctuate and
the amplitude may not be computed.
Try increasing the gain or change the
watch position (crown, back, case…).
The gain is good.
The first and third pulses are sharp
enough.
The gain is too high.
The rate accuracy may fluctuate
and the amplitude may display
abnormally high values (> 350°).
Try decreasing the gain or change the
watch position (crown, back, case…).
Accuracy2User Guide 3|4
3. Track the results with the cumulative charts
It is often interesting to check how both the accuracy and the amplitude vary
over time.
Some particular and natural fluctuations might appear, like the impact of defects
in the gear train, the drop of the amplitude during the change date, or more
generally the variation of the rate accuracy over the entire power reserve of the
watch.
www.h2i.ch18|11|21 Version N°1.0H2i SA, 2017 Boudry, SwitzerlandCopyright © 2021 H2i Sàrl

Accuracy2User Guide 4|4
5. Save and export the data
You can save all of your results during the measurement in a smart integrated
database. Rate accuracy, amplitude, beat error, graphs… Everything you need to
track is saved.
With iOS, all your measurements are also automatically saved on iCloud to keep
the data available on all your devices.
All the measurement results can be exported in a CSV file format.
You can share your results, save them in the brand new File app available on
iOS 11 or process them for a detailed post-treatment with Excel.
www.h2i.ch18|11|21 Version N°1.0H2i SA, 2017 Boudry, SwitzerlandCopyright © 2021 H2i Sàrl