Copyright © Shimmer 2017
Realtime Technologies Ltd Shimmer User Manual
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64
9.1.4. Shimmer Clock Drift
Like many embedded devices, the clock on the Shimmer device is prone to drift. Laboratory
experiments have indicated that Shimmer-to-Shimmer clock drift is variable and can be up to 12
µs/s. To equate this to longer recording periods 12µsec/sec is equivalent to 0.72 ms/min, 43
ms/hour and 1.04 s/day.
9.2. Appendix B - Legacy Support
9.2.1. Legacy Support
Shimmer1, Shimmer2, and Shimmer2R daughter boards and applications are not compatible with
Shimmer3.
Dock and Charging Peripherals may be used for charging and, in some cases, firmware updates.
Flash access is not supported using legacy docks.
9.3. Appendix C – Opening or assembling the Shimmer3 enclosure
Whilst the Shimmer3 enclosure can be opened to allow hardware reconfiguration of the device (e.g.
adding an expansion board), it is important to note that the plastic enclosure is not designed for
regular opening and closing. In particular, it is recommended that the screws not be removed and
reinserted on a regular basis as damage to the plastic by over-use of the screw mechanism will
occur.
Please, consider your configurations carefully to minimise the number of hardware
reconfigurations you will need to carry out.
The following instructions should be used as a guide for opening and closing the Shimmer3
enclosure.
9.3.1. Opening the enclosure to change the SD card or insert an expansion board
1. Unscrew the screws using a T6 screwdriver.
2. Turn the unit over so that the button is facing up.
3. Carefully remove the top of the case, opening from the end of the dock connector.
4. You now have access to the SD card slot and the internal expansion connector.
5. If, for any reason you need to remove the circuit board from the case, lift it upward out of
the case. The battery should be attached to the underside of the board – ensure that it
comes out of the case with the board so as not to damage the connections.
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