Noraxon Ultium EMG System User Manual page 23

Ultium EMG Hardware User Manual
6.7.4 Green Indicator
The indicator will remain
RMS voltage, and frequency is sufficient to produce a
clean signal.
6.7.5 Red Indicator
The indicator will turn red
1. The impedance is > 100 kΩ
2. The RMS value is > 5uV and the median
frequency of the signal is 50 Hz or 60 Hz (+/- 3
Hz). This is because these are the frequencies of
mains AC power which can interfere with the
EMG signal.
6.7.6 Related Software Measurement Tools
Within the Noraxon myoResearch software is a suite of tools that can be used during EMG
measurements. Below is a list of the most used features for electromyographic recordings. Additional
information around more advanced features can be found on
Baseline Calibration Baseline Calibration Baseline Calibration Baseline Calibration
Data collected during the first second of a measurement is
used to correct for any offset present in the signal. During the
first second of each measurement, ensure that the subject is
not performing highly dynamic movements to capture a clean
signal recording.
To perform this step manually, select Calibrate Baselines
Choose EMG Baseline Check EMG Baseline Check to show the baseline RMS
EMG Baseline Check EMG Baseline Check
voltage in the Status Monitor.
simultaneously.
CAUTION
(Rev J)
green when the impedance,
if:
Calibrate Baselines. Calibrate Baselines Calibrate Baselines
This tool will adjust baselines for all EMG and analog channels
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