WorksheetsLab 5 EMG Quiz
Total questions: 12
Worksheet time: 6mins
Which signal is routed to A2 on the Arduino?
Raw EMG (pre-rectification)
Analog rectified EMG (precision rectifier output)
Analog EMG envelope (LPF output, biased at REF)
Pressure (MPXV)
When using Analog Devices Signal Chain Designer for the analog envelope stage, which set matches the lab spec?
Differential, second order, inverting, Gain=2 V/V
Single-ended, first order, non-inverting, Bias=REF, Gain=1 V/V
Single-ended, first order, inverting, Bias=0 V, Gain=1 V/V
Differential, first order, non-inverting, Bias=REF, Gain=2 V/V
You must justify your chosen envelope cutoff fc (typically 2–10 Hz) with a textbook or peer-reviewed reference.
True
False
All datasets used in processing must be resampled to 100 Hz before further steps.
True
False
To fairly compare analog and digital envelopes, the digital envelope’s fc must match the analog LPF’s fc.
True
False
How many total mouse clicks with ginput are required to mark the five plateau regions in the Force–EMG dataset?
5
8
10
12
What is the recommended way to visually highlight the selected plateau regions in your plot?
islocalmax peaks
xregion translucent vertical bands
spectrogram shading
Vertical axis breaks
For which datasets must you convert pressure counts to kPa using PkPa=0.009Vout÷Vs−0.04
Dataset 2 (Force–EMG) and Dataset 3 (Fatigue)
Dataset 1 (MVC) only
All datasets (MVC, Force–EMG, Fatigue)
None; keep counts
Which statement about MVC normalization is correct?
Normalize all EMG (analog and digital) by MVC_EnvDigital
Normalize only analog rectified EMG by MVC_EnvAnalog
Normalize analog (rectified & envelope) by MVC_EnvAnalog; normalize digital (rectified & envelope) by MVC_EnvDigital
Do not normalize EMG at all
Time-to-50% MVC is measured as:
Time from squeeze start to the first post-peak crossing of 50% of peak-above-baseline
Time from start of recording to when pressure equals baseline
Time from squeeze start to the global minimum
The force decay rate is computed by fitting a straight line to the pressure signal between peak pressure and the 50% level.
True
False
You should plug in the Arduino UNO immediately to begin testing while you are still laying out circuits in Tinkercad.
True
False
