Using the cpo timer
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Using the CPO timer. All of the items below should be in the “Little Black Box of Science”. CPO Timer Inputs. It doesn’t make a difference what color ( red or blue ) phone cord you use for input A or B. However, the A cord/photogate should be the top photogate. CPO Computer.

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Using the CPO timer

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Using the cpo timer

Using the CPO timer

  • All of the items below should be in the“Little Black Box of Science”


Cpo timer inputs

CPO Timer Inputs

  • It doesn’t make a difference what color (red or blue) phone cord you use for input A or B.

  • However, the A cord/photogate should be the top photogate.


Cpo computer

CPO Computer


Photogate uses an invisible beam of infra red light to start and stop the timer

Photogateuses an invisible beam of infra-red light to start and stop the timer.


The 5 0 cm car wing triggers the photogate

The 5.0 cm car “wing” triggers the Photogate


The 5 0 cm wing start and stops the timer

The 5.0 cm wing start and stops the timer


The timer works like 3 internal stopwatchs

The timer works like 3 internal stopwatchs

Time thru A

Time from A to B

Time thru B

No times shown


Using the cpo timer1

Using the CPO Timer

  • Turn on the A light only, if you want to know how long it took the car to go through photogate A.

  • Turn on the B light only, if you want to know how long it took the car to go through photogate B.

  • Turn on the A & B lights, if you want to know how long it took the car to go from photogate A through photogate B.


Using the cpo timer2

Using the CPO Timer

  • On interval mode, you never have to push the reset button. It automatically resets every time you send the car down.

  • The timer “remembers” all 3 times when you send the car down the ramp. To retrieve the times, just push the corresponding A & B buttons.


Resolution

Resolution

  • The smallest interval that can be measured.


The timer has a resolution of 0001 seconds that s ten thousandth s of a second

The timer has a resolution of (.0001 seconds) That’s ten thousandth’s of a second

Ten Thousandth

Tenth

Hundredth

Thousandth

Interval Mode


Accuracy

Accuracy

  • Accuracy: how close a measurement is to the true value.


The cpo timer photogates are accurate to the or 0005 of a second

The CPO Timer & Photogates are accurate to the + or - .0005 of a second.


Precision how close together repeated measurements are

Precision:How close together repeated measurements are.

  • Which group is more precise?


Ifr index finger release

“IFR”Index Finger Release

  • This will make a big difference on the precision of our data!

  • Good “IFR” technique should give us a precision of + or - .0005 seconds


Accuracy precision

Accuracy & Precision


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