Vernier Motion Detector Specifiche Scaricare il pdf (Pagina 3)

 Check for a stationary object (chair, table, etc.) in

the cone of the ultrasound. This object may be

detected when you are trying to study an object

further away. It may not take a very large object to

cause problems. If you have trouble with a

stationary object causing unwanted echoes, try

setting the equipment up so that the objects are not

in the cone or placing a cloth over the object. This

minimizes the ultrasound reflection.

 Also note that the cone of ultrasound extends downward from the center line.

This can cause problems if you are using the Motion Detector on a hard,

horizontal surface. In these cases, try pivoting the head of the Motion Detector

to aim it slightly upward.

3. Noisy or erratic data may have a number of causes. Here are some tips.

 Sometimes other sound sources can cause problems. If there is another source

of ultrasonic waves in the same frequency range, this will cause erroneous

readings. Examples include motors and fans, air track blowers, the sound made

by the air exiting the holes on an air track, etc. Try to eliminate these sources of

noise. If you are using an air track, try changing the air flow volume.

 Make sure that the Motion Detector is not placed close to a computer or

computer monitor.

 If the room in which the Motion Detector is being used has a lot of hard, sound-

reflecting surfaces, you can get strange effects caused by the ultrasound

bouncing around the room. Standing waves can be set up between the Motion

Detector and a sound reflector. Try placing a cloth horizontally just in front of

and below the Motion Detector. This sometimes helps eliminate ultrasound that

is “skipping” into the Motion Detector.

 Try changing the data-collection rate. Sometimes Motion Detectors work better

at one data rate than another. Rates above 30 Hz do not work well in

acoustically live rooms.

 If you are studying people moving, have them hold a large, flat object (e.g., a

large book or a pizza box) as a reflector. If you have an irregular reflecting

surface, sometimes the waves will be reflected back to the transducer, and

sometimes not. The results will seem erratic.

Specifications

Range: 0.15 to 6 m

Resolution: 1 mm

Support Products

Motion Detector Clamp (order code MD-CLAMP)

The Motion Detector Clamp attaches to the back of the Motion

Detector, and then the clamp can be attached to a variety of objects

such as table tops, ring stands, etc. The clamp adds versatility.

Vernier Dynamics System (order code VDS)

The Vernier Dynamics System consists of a versatile track and two

carts with ultra low friction bearings. This system facilitates performing kinematics

and dynamics experiments. The Motion Detector attaches to the dynamics track in

such a way that the entire track can be used for motion studies.

Warranty

Vernier warrants this product to be free from defects in materials and workmanship

for a period of five years from the date of shipment to the customer. This warranty

does not cover damage to the product caused by abuse or improper use

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