Texas Instruments CBL 2, Руководство по началу работы

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48 G
ETTING
S
TARTED WITH THE
CBL 2™ S
YSTEM
© 2000, 2003 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
3.
The measurement made at .5 meter should be 4 times the measurement made
at 1 meter.
The measurement made at 1 meter should be 4 times the measurement made at
2 meters.
The measurement made at 1.5 meters should be 4 times the measurement made
at 3 meters.
4.
There is a large discrepancy. For example, the actual measurement made at 2
meters is only 3.06 times the actual measurement made at 4 meters.
5.
extraneous light in the room, errors in measuring distance, the light probe is not
zeroed, the light probe may not be aimed directly at the light bulb
6.
depends on results
7.
Cut pieces of string to very precise lengths and hold the light probe in place by
holding one end of a piece of string against the tip of the light probe and the
other end in a fixed position near the light bulb. Be careful not to burn yourself
on the light bulb.
8.
roughly a 4% error
9.
roughly a 1% error
10.
Extraneous light introduces an error. For example, a particular reading might go
up by 0.15
11.
Make two readings at each distance from the light bulb— one with the light
bulb on and the other with the light bulb off. The difference between these
two readings is the intensity from the light bulb.