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Summary of Contents for Shimmer Shimmer3 EMG
- Page 1 Copyright © Shimmer Research 2013 Realtime Technologies Ltd IMU User Manual All rights reserved Rev 1.1 EMG User Guide Revision 1.12...
- Page 2 Neither the name of Shimmer Research, or Realtime Technologies Ltd. nor the names of its contributors may be used to endorse or promote products derived from this document without specific prior written permission.
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Page 3: Table Of Contents
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Table of Contents Introduction ..........................5 General Information ......................... 6 2.1. Safety Information ......................6 2.2. Pre-Requisites ........................6 2.3. EMG Unit Specification Overview ..................6 Using the EMG Unit ........................ - Page 4 Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 6.1. Board Layout ........................19 6.2. Channel assignment ......................20 6.3. Data considerations ......................21 Firmware Considerations ......................21 Troubleshooting ........................21 8.1. Verifying That Your EMG Unit Works ................21 8.2.
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Page 5: Introduction
Rev 1.12 1. Introduction This document is an accompaniment to the Shimmer3 EMG Unit (called EMG Unit in the rest of this document). Its purpose is to aid the user in getting started with EMG measurements. The EMG Unit can be configured to measure electrical signals from the skin, including EMG (Electromyograph). -
Page 6: General Information
2.3. EMG Unit Specification Overview For specifications on the general Shimmer3 part, (i.e. microprocessor, radio, data storage and inertial sensors) of the Shimmer3 EMG Unit, please refer to the Shimmer User Manual. Gain: Configurable (1, 2, 3, 4, 6, 8, 12). -
Page 7: Using The Emg Unit
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Ultra-lightweight (31 grams); Compact Dimensions (65 x 32 x 12 mm). EEPROM memory: 2048 bytes. 3. Using the EMG Unit 3.1. Basic System Overview Figure 3-1: Simplified Block Diagram ... -
Page 8: Common Mode Rejection
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Common Mode Rejection Each EMG board connects to five electrodes, namely, a positive and a negative electrode for each for two channels and a neutral reference electrode. The reason for using three electrodes in this way is that the EMG signal amplitude is, typically, very small relative to noise, for example, interference from power lines and nearby electrical sources. -
Page 9: Configuration Options And Recommended Settings
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Figure 3-2 shows an example of how the electrodes should be positioned on the body. The positive and negative electrodes should be placed in parallel with the muscle fibres of the muscle being measured, near the centre of the muscle. -
Page 10: Data Rate
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 CH2SET: Gain2 MUX2 Channel 2 Settings (G2_2, G2_1, G2_0) (M2_3, M2_2, M2_1, M2_0) RLD_SENS: PDB_RL RLD_LO RLD Settings Right Leg Drive Sense Selection FF_SENS (RLD2N, RLD2P, RLD1N, RLD1P) -
Page 11: Input Multiplexer
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 12 (recommended) DO NOT USE Table 3-3 EMG Channel Gain options Input Multiplexer The multiplexer (MUX) settings can be configured independently for each of the two data channels on each chip;... -
Page 12: Test Signal
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 The RLDREF_INT bit of the RESP2 byte (byte 9, bit 1) controls the RLDREF signal source for the RLD amplifier. If the value of the bit is 0, the reference signal is fed externally. If the value of the bit is 1, an internally generated reference signal is generated. -
Page 13: Measuring Emg Signals
Considering that the ADC sensitivity is known and that the ADC Output is measured from the Shimmer, in order to calculate the EMG signal in mVolts, the values for the Gain and ADC Offset must simply be inserted into Equation 2. -
Page 14: Adc Offset Measurement
The ADC offset for the Channel 1 is then calculated as the mean ADC output on the EMG Ch1 of the Shimmer with the Ch1P and Ch1N inputs connected together. This can easily be found by saving uncalibrated data to a file and then calculating the mean value. The offset for other channels is calculated similarly. -
Page 15: Common Emg Signal Processing Techniques
Please note that software solutions for EMG signal processing are not currently provided by Shimmer and the information below is intended as a starting point for the new user to aid their software development. Should you require customised software solution, please contact the Shimmer team. -
Page 16: Extracting The Linear Envelope Of An Emg Signal [3]
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 The middle signal (orange) is the same signal with a Butterworth band-pass filter applied, with Fc,low set to 20Hz and Fc,high set to 511Hz. It can be observed that the motion artifact has been removed. -
Page 17: Integration Techniques [3]
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Figure 5-2: A raw EMG signal and its linear envelope. 5.3. Integration Techniques [3] Continuous integration is the integration of the current sample with all previous samples in the signal. -
Page 18: Normalisation [3, 4]
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Figure 5-3: Continuous integration, periodic reset integration and threshold reset integration 5.4. Normalisation [3, 4] Normalisation is used to eliminate variability across subjects, electrode placement and day to day differences in measures of the same muscle site, when carrying out research using EMG. -
Page 19: Hardware Considerations
6. Hardware Considerations 6.1. Board Layout Note: For Shimmer3 EMG hardware purchased prior to July 2015, please refer to Appendix 10.2 of this document. Figure 6-1 and Figure 6-2 show the board layout for the EMG Unit, with components labelled. The two ADS1292R chips are labelled EU1 and EU2 and are referred to in the documentation as Chip1 and Chip2, respectively. -
Page 20: Channel Assignment
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Figure 6-2: EMG Board Layout (top view) 6.2. Channel assignment When the MUX settings recommended in Section 3.3 of this document are configured, the channel assignment for EMG is as follows: ... -
Page 21: Data Considerations
A disconnected electrode or connector (lead-off) will adversely affect the measured EMG signal. This occurrence can be detected by the ADS1292R chip. Further information on this advanced functionality will soon be provided by Shimmer. In the meantime, interested users may refer to the ADS1292R datasheet for more details. -
Page 22: References
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 9. References [1] Raez M.B.I., Hussain M.S., Mohd-Yasin F. (2006). Techniques of EMG signal analysis: detection, processing, classification and applications. Biological Procedures Online. 8 (1), p11-35. -
Page 23: Appendices
10. Appendices 10.1. Legacy Hardware The information in this section is relevant for Shimmer3 EMG hardware purchased prior to July 2015. Figure 10-1 and Figure 10-2 show the board layout for the EMG Module, with components labelled. The two ADS1292R chips are labelled EU1 and EU2 and are referred to in the documentation as Chip1 and Chip2, respectively. -
Page 24: Channel Assignment
Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 Figure 10-2 EMG Board Layout (top view) Channel assignment When the MUX settings recommended in Section 3.3 of this document are configured, the channel assignment for EMG is as follows: ... -
Page 25: Troubleshooting
Superdots also provides some shock absorbtion. Shimmer fits the Superdots by stretching them around the edges of the Expansion Board. This ensures that the adhesive doesn't prevent the connectors from making a good connection and there is enough adhesive to secure the boards together but not to interfere with the fit. - Page 26 Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12 connection, which could result in loss of communication between the expansion board and the Shimmer3 mainboard. Please refer to the Shimmer assembly video on our YouTube channel http://youtu.be/jcuB4yVEBWI...
- Page 27 Copyright © Shimmer 2017 Realtime Technologies Ltd EMG User Guide All rights reserved Rev 1.12...
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