CNIM -INSTRUMENTATION TEST
QUESTIONS AND ANSWERS
The unit of resistance is represented by... - ANSWER Ohms.
Fast Fourier Transformation - ANSWER A mathematical reduction of a
complex waveform into simpler, more uniform waves.
To resolve amplitudes of 256 discrete steps, an 8-bit A-D converter is required.
This can be expressed as... - Answer: 2^8
What is the minimum bandpass for an EP system? - ANSWER: 0.1–5,000 Hz.
The gain of an amplifier configured to produce a 1 volt output signal from a 10
uV input signal is... - ANSWER Gain=output/input
Gain equals 1,000,000 uV/10 uV.
Gain=100,000
A 100 mS epoch is captured after a 10 ms post-stimulus triggering. What best
characterizes the resulting sweep? - ANSWER A 100-ms sweep begins 10 ms
after the stimulus.
SSEP recordings usually require a bandpass of... - ANSWER: 30 to 3000 Hz.
To appropriately describe an EP waveform's amplitude, a match between the... -
ANSWER: Signal size and vertical capacity of the digitizer
When choosing the horizontal parameters of analysis, the... - ANSWER
Sampling rate should be at least two times greater than the highest frequency in
the signal.
, Artifact rejection is based on the idea that excessive amplitude ANSWERs are
likely to contain artifact.
In an IONM differential amplifier, the common mode rejection of in-phase
signals is usually... - Answer: 10000 to 1
A differential amplifier records... - Answer The difference between two inputs.
An erroneous depiction of an analog wave by A-D conversion that suggests a
lower frequency due to a low sampling rate is known as... - ANSWER Aliasing
What are some good insulation materials? - ANSWER: Glass and Rubber
Electrode impedance is described as opposition to... - ANSWER: alternating
current flow.
Dwell time is defined as... - ANSWER The Intersample interval
The majority of ABR reports are displayed unless otherwise stated... -
ANSWER Vertex is positive up
Horizontal resolution in an evoked potential system... - ANSWER Should be
20 milliseconds or less per data point.
The amplifier's display will be determined by the difference in voltages between
inputs 1 and 2. - ANSWER Either upward or downward.
In theory, the amplitude of the EPs compared to the background noise... -
ANSWER Will improve by about the square root of the average number of
epochs.
Nyquist frequency... - Answer Minimum sampling rate to avoid aliasing.
Cathode - Answer A negative pole or block dot on the bar electrode.
Aliasing is caused by...- ANSWER Sampling below the Nyquist frequency.
QUESTIONS AND ANSWERS
The unit of resistance is represented by... - ANSWER Ohms.
Fast Fourier Transformation - ANSWER A mathematical reduction of a
complex waveform into simpler, more uniform waves.
To resolve amplitudes of 256 discrete steps, an 8-bit A-D converter is required.
This can be expressed as... - Answer: 2^8
What is the minimum bandpass for an EP system? - ANSWER: 0.1–5,000 Hz.
The gain of an amplifier configured to produce a 1 volt output signal from a 10
uV input signal is... - ANSWER Gain=output/input
Gain equals 1,000,000 uV/10 uV.
Gain=100,000
A 100 mS epoch is captured after a 10 ms post-stimulus triggering. What best
characterizes the resulting sweep? - ANSWER A 100-ms sweep begins 10 ms
after the stimulus.
SSEP recordings usually require a bandpass of... - ANSWER: 30 to 3000 Hz.
To appropriately describe an EP waveform's amplitude, a match between the... -
ANSWER: Signal size and vertical capacity of the digitizer
When choosing the horizontal parameters of analysis, the... - ANSWER
Sampling rate should be at least two times greater than the highest frequency in
the signal.
, Artifact rejection is based on the idea that excessive amplitude ANSWERs are
likely to contain artifact.
In an IONM differential amplifier, the common mode rejection of in-phase
signals is usually... - Answer: 10000 to 1
A differential amplifier records... - Answer The difference between two inputs.
An erroneous depiction of an analog wave by A-D conversion that suggests a
lower frequency due to a low sampling rate is known as... - ANSWER Aliasing
What are some good insulation materials? - ANSWER: Glass and Rubber
Electrode impedance is described as opposition to... - ANSWER: alternating
current flow.
Dwell time is defined as... - ANSWER The Intersample interval
The majority of ABR reports are displayed unless otherwise stated... -
ANSWER Vertex is positive up
Horizontal resolution in an evoked potential system... - ANSWER Should be
20 milliseconds or less per data point.
The amplifier's display will be determined by the difference in voltages between
inputs 1 and 2. - ANSWER Either upward or downward.
In theory, the amplitude of the EPs compared to the background noise... -
ANSWER Will improve by about the square root of the average number of
epochs.
Nyquist frequency... - Answer Minimum sampling rate to avoid aliasing.
Cathode - Answer A negative pole or block dot on the bar electrode.
Aliasing is caused by...- ANSWER Sampling below the Nyquist frequency.
