Digital Instrumentation Concepts / Impedance / Settings

What is the best way to increase signal-to-noise ratio?

Increase number of averages/repetitions

Minimum requirement for vertical resolution of AD converter?

16 bits

8bit AD converter has how much voltage?

256 volts

What would result in the best resolution in the AD conversion process?

Maximal peak-to-peak signal amplitude should match the converter range

If the signal to noise ratio is 1, how many trials must be averaged to achieve a ratio of 4?

16.

To improve a signal-to-noise ratio by a factor of 100, how many responses need to be averaged?

10,000

What is the signal to noise ratio after 64 trials if the voltage is 50uV and the noise us 100uV?

4:1

If 100 trials creates 2:1 SNR, how many trials for 20:1 SNR?

10,000

Artifact rejection should be set to

90-98% of the dynamic range

Alternating current is used when checking electrode impedance to

avoid electrode polarization.

Balanced impedances allows you to

maximize common mode rejection.

Why should the impedance of stim electrodes be kept low and balanced

to reduce stimulus artifact.

Which of the following affect the ability to record BAEPs?

Drilling

What opposes any change in current?

Inductance

EP data are obliterated with

cautery.

SSEP bandpass settings?

30 - 3000 Hz

What is the filter band pass for short latency SSEP?

30 - 3000 Hz

Ratio of amplifier output voltage to input voltage

Recording gain