Lab 1

Question 1

What is the purpose of the PowerLab system?

Answer 1

to acquire, store, and analyze data

Question 2

What is the raw input signal?

Answer 2

analog

Question 3

What is the difference btwn analog and digital signals?

Answer 3

• analog signals are continuous, meaning there are no gaps in info (EX: body temp and weight)
• digital signals are discreet, meaning that there are gaps in info

Question 4

What did we measure in this lab?

Answer 4

pulse - change in force in the arteries

Question 5

____________ signal is analog, and the force transucer will convert it into an ____________ signal, which is also analog. Through ______ ________________.

Answer 5

Mehanical, electrical, signal transuction

Question 6

The voltage signal is then sent to the powerlab, and is processed through what?

Answer 6

• Amplification - amplitudes are being increased
• Filtering - makes the signal cleaner, gets rid of the noise
• Sampling - converts signal from analog to digital, allows data to be displayed

Question 7

What are digital signals influenced by?

Answer 7

sampling rate - the higher the sampling rate, the less gaps in info; the smaller the sampling rate, the more gaps in info

Question 8

What happens if the strap of the pulse transducer is too tight?

Answer 8

• signal will be weak, intermittent or noisy

Question 9

What are some other things that the powerlab can measure?

Answer 9

finger pulse, blood pressure, respiration and can even do EMGs