Oscillation

Period

Frequency

The time is connected to an electricity supplyand cause the metal strip attached to thetimer to vibrate. Eg: 50 Hz or 50 times everysecond.

The time interval between two consecutive dotsis 1/50 s = 0.02s.

Frequency of Ticker Tape: No of dots producedin a second.

Hence, the ticker tape timer is a kind of clockthat measures time in 0.02s intervals.

When distance between successive dots isconstant, the tape is moving at a constantspeed.

When distance between successive dotsincreases, the tape is moving faster (speedincrease).

When distance between successive dotsdecreases, the tape is moving slower (speeddecreases).

Degree of Accuracy: 1 Second

Degree of Accuracy: 0.01 second (Digital), 0.1second (Analog)

Degree of Accuracy: 0.02 seconds between 2dots

Measured Length Range: 0m 10m

Accuracy: 0.1cm or 1 mm

Measured Length Range: 0cm to 100cm

Accuracy: 0.1 to 1 mm

Measured Length Range: 2cm to 10cm or20mm to 100mm

Accuracy: 0.01cm or 0.1mm

Measured Length Range: Less than 3 cm or0mm to 30mm

Accuracy: 0.001cm or 0.01mm

Accuracy: 0.1cm or 1mm

Parallax Error

Positive

Negative

When reading a Micrometer Screw Gauge, errorcan occur due to zero error.

Thus before we use the instrument, we mustcheck for zero error.

Positive

Negative

10^9

10 ^6

10^3

10^-1

10^-2

10^-3

10^-6

10^-9

m ²

m³

kg/m³ or kgm-³

m÷s or ms-²

kg m s-²

SI Unit: Metre

Symbol: m

SI Unit: Kilogram

Symbol: kg

SI Unit: Seconds

Symbol: s

SI Unit: Ampere

Symbol: A

SI Unit: Kelvin

Symbol: K

SI Unit: Mole

Symbol: mol

SI Unit: Candela

Symbol: cd