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14 Cards in this Set
- Front
- Back
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Name possible situations in which you may need to use a low frequency filter (LFF) of 5 HZ.
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To emphasize fast components such as spikes or sleep spindles by minimizing slow activity. In case of sweat artifact which cannot be controlled by any other means, the filter can minimize the baseline sway
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Name possible situations in which you may need to use a low frequecy filter (LFF) of 0.3 or 0.1 Hz.
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to emphasize low amplitude slowing; in association with 15 mm/sec time base; during an electrocerebral inactivity (ECI) recording to make sure there is no slow activity
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Name possible situations in which you may need to use a high frequecny filter (HFF) of 35 or 15 Hz.
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excessive muscle artifact that cannot be removed by any other means
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A high filter settign of 15 hertz will not show significant information at
A. 50 hertz B. 15 hertz C. 10 hertz D. 5 herts |
50 hertz
The faster the frequency the more the 15 hertz filter will attenuate the signal. Viewing a frequency response curve shows that a 15 hertz HFF will greatly attenuate a 50 hertz wave. |
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Which of the following is most attenuated by a time constant of .01 seconds?
A. 10 hertz B. .5 hertz C. 3 hertz D .3 hertz |
.3 hertz
The slowest wave, a .3 hertz, will be attenuated the most. |
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Which of the following is attenuated by a low pass filter of 15 hertz?
A. 1 hertz B. 10 hertz C. 20 hertz D. 5 hertz |
C. 20 hertz
A 15 hertz filter passes through the low/slow frequencies so it does not affect the 1, 5, or 10 hertz signals. |
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Define filter.
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Used to exclude waveforms that are out of range so that waveforms of most importance can be recored with out distortion.
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Which filter setting will record the greatest amplitude of a 70 hertz wave?
A. 15 hertz B. 35 hertz C. 50 hertz D. 70 hertz |
D. 70 hertz
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Which filter setting will record the greatest amplitude of a .4 hertz wave?
A. 5 hertz B. .1 hertz C. 1 hertz D. .3 hertz |
The slower the LFF setting (or the longer the time constant), the more voltage of the slow frequencies will be recorded.
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Whcih one of the following frequencies is most attenuated by a low filter of 5 hertz?
A. 5 hertz B. 1 hertz C. .1 hertz D. 10 hertz |
A. 5 hertz
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Which time constant will record the greatest amplitude of a 1 hertz wave?
A. .03 hertz B. .1 hertz C. .1 secon D. 1 second |
D. 1 second
The longer the time constant, the more voltage of slow activity will be recorded. |
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Which one of the following frequencies is most attenuated by a low filter of 0.1 hertz?
A. .2 hertz B. 2 hertz C. .5 hertz D. 3 hertz |
D. 3 hertz
The faster the slow activity, the more it will be attenuated by a LFF. |
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Which filter setting will record the greatest amplitude of a 50 hertz wave?
A. 15 hertz B. 70 hertz C. 50 hertz D. 35 hertz |
B. 70 hertz
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Which low filter setting will most faithfully record the amplitude of a 1.5 hertz slow wave?
A. 1 hertz B. .5 hertz C. .3 hertz D. .1 hertz |
D. 1 hertz
The slower the LFF setting ( or the longer the time constant), the more voltage of the slow frequencies will be recorded. |
