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20 Cards in this Set
- Front
- Back
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Frequency Formula
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1/Duration
or PS / V Ex: To calculate this, divide the PS (mm/msec) by the wave length (mm). |
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Sensitivity (S) Formula
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V / D (A or W)
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Voltage Formula
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SD (A or W)
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Duration Formula
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V / S
or V/PS X1000 Ex: To calculate this, measure the length (mm) of the wave and divide by the PS, then multiply by 1000. |
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Amplitude (D) Definition
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(Wave length)
Measured in millimeters (mm). The height of the wave. |
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Voltage (V) Definition
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Measured in microvolts (mV or uV).
The power of the wave. |
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Duration Definition
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Measured in miliseconds (msec).
The time it takes for a wave to occur in a period of time. |
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Frequency Definition
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Measured in hertz (Hz) or cycles per second.
How often a wave can occur in a period of time. |
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Gain
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The ration of the output signal of the input signal (or) the amount of magnification being used to amplify or increase the voltage of a signal.
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Sensitivity (S) Definition
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The amount of voltage for each 1(mm) of pen deflection and is expressed in uV/mm.
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Frequency and Duration Relation
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Mathematical reciprocals of each other.
As the first increases, the second decreases and vice-versa. |
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Paper Speed Definition
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The amount of paper used in a particular length of time.
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Standard Paper Speed
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EEG standard speed is 30mm/sec, which means every 30mm of paper is equal to 1 second.
1 large section on a page, 5 smaller sections. |
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5 small divisions on paper equal...
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200 msecs.
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2 seconds recording time equals...
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1/2 Large division and 2.5 smaller divisions
15 mm/sec and 400 msecs. |
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1/2 second recording time equals...
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2 large divisions and 10 smaller divisions.
60 mm/sec and 100 msecs. |
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Nyquist Criteria
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The sampling rate must be at least twice as fast as the fastest frequency being recorded.
3-4 times as fast is ideal for digital conversion. |
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Aliasing
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This occurs when there are not enough digitalized points made on the wave fro accurate digital conversion.
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Amplification
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Enlarges tiny electrical signals coming from the brain so they nay be displayed on paper or digitally.
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Differential Amplifier
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The output voltage is equal to the difference between the input voltages of G(rid) 1 and G2.
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