Introduction To Engineering Camera Lab #2 - 1AgendaShutter Mechanism

Review basic statistical methods Opening the camera case Measure flash duration using the oscilloscope Measure shutter speed using the oscilloscope

Statistical Mean

x 1

Nxii 1

N

The mean is our “best guess” of the true value of the quantity we’re measuring.

The arithmetic average of all N measurements

Standard Deviation

Estimate of error in measurementsSmall error values are good

x 1

N 1xi x 2

i 1

N

Normal Distribution

f(x) is probability of observing value

f (x) 1

2 e 12

x

Camera Back

Snap location 4 Snap location 5

Snap location 2

Snap Location

1

Snap Location

3

Camera with Back RemovedLight seal groove

Back Cover from Camera

Ridge for light seal

Important notes:

Each group must record data Make sure one person in each group

gets all the data!Make sure data is given to all group

members

Remove only the camera case back plate.Measure flash speed with light probe and

oscilloscope and record value.Measure shutter speed with light probe

and oscilloscope and record value.Sketch oscilloscope traces.

Lab Steps for Today

Assignment

Read sheet on experimental error from course packet

Calculate mean and standard deviation for flash duration and shutter speed

Prepare for Camera Lab 2 Part B