lab midterm #1

Question 1

1. List three signals that can be collected by Lt Labstation?

Answer 1

• Ecg, eeg, emg
• Pulse
• Number of beats
• Heart rate

Question 2

2. What does each button (delete, select point, start recording, marker, auto scale, compression, comment) on the data collection screen do?

Answer 2

• Delete: delete the data
• Select point: selects a certain point in data to see the information
• Start recording: start recording data
• Marker: placing the marker on the baseline, the value panal readout changes from absolute amplitude to relative amplitude. That is it shows the difference (delta) from baseline value
• Auto scale: allows you to auto scale the data
• Compression: compress or expand the time axis

Question 3

3. When would you use a signal conditioner versus a transducer?

Answer 3

• Transducers are sensors that convert biological signals into electrical analog singals
• Biological signals that require extra amplification, filtering, and isolation are preprocssed by signal conditioners. These include bio amp and spirometer pod

Question 4

4. When recording using the pulse transducer, why is it important that the hand be in a supinated (palm up) position?

Answer 4

• The hand must be supination because it must be similar to anatomical position. It ensures that no veins artieries or nerve are twisted

Question 5

5. What happened to the signal when the volunteer twitched their fingers?

Answer 5

• The BPM increased and the pulse looked sporadic and not in uniform

Question 6

6. What signal is each channel collecting?

Answer 6

• The pulse channel shows raw data signal which us coming directly from your volunteers fingers
• The number of beats channel has a channel calculation applied to it so the signal you see is calculated based on the raw data