1. A differential amplifier records:
Only the first two inputs
The second half of the inputs
The power of the sum of the two inputs
The difference between the two inputs
Answer: The difference between the two inputs
2. Accurate representation of an EP waveform requires a match between the:
Signal size and vertical capacity of the digitizer
High frequency noise and smoothing operation of the digitizer
Dwell time and sampling rate
Horizontal resolution and signal size
Answer: Signal size and vertical capacity of thedigitizer
Digitization refersto the process of converting the amplitude of an analog signal intoa series of
numbers. The most accurate representation of the amplitude (vertical resolution) of a
waveform will result when the actual amplitude represents the full capacity of the digital
conversion. This would be analagous to taking a photographand using enough tiny pixels to
represent the photograph in an appropriate size.
Without enough pixels, the photograph will have a low resolution and appear blurry.Using the
full capacity of pixels will yield the most accurate representation of the image.
3. Due to smaller surface area, subermal needle electrodes will register animpedance that is:
Lower than surface electrodes
Increased upon insertion
Improved by cleansing the skin
Higher than surface electrodes
Answer: Higher than surface electrodes
This question refers specifically to electrode's surface area. Although we know subdermal
electrodes are less likely to become dislodged and experience less skin-resistance than surface
electrodes, the question is asking specifically about the relationship between surface area and
impedance of a fully intact electrode. Impedance is essentially resistance in a more complex
relationship (the resistanceof an alternating current). And resistance increases when surface
area decreases.
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