Biomedical Engineering Reference
In-Depth Information
30
20
10
0
7
0
1
2
3
4
5
6
Voltage (V)
Figure 9.11
Data for Case Study 9.5.
Y = 5.0025x
R
2
= 0.9998
30
20
10
0
0
1
2
3
4
5
6
7
Voltage (V)
Figure 9.12
Calibration graph.
A word of warning: the costs increase inordinately with magnification. If you are going
to pay for the higher magnifications then make sure you have specific criteria to measure
against. Whatever the device, make sure that it has been calibrated, and check the calibration
before use.
9.3.4.1 USB Microscopes
Although specifications state they can reach magnifications of X400, do not expect too much.
They often sell for less than $50 and hence you get what you pay for. But for inspection of
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