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

  • 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


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 wing start and stops the timer


The timer works like 3 internal stopwatchs

Time thru A

Time from A to B

Time thru B

No times shown


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 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

  • The smallest interval that can be measured.


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: how close a measurement is to the true value.


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


Precision:How close together repeated measurements are.

  • Which group is more precise?


“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


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