Volume Resistivity:
The volume resistivity nomograph (Figure 3-3) is made up
of four scales and a Graph Line. The four scales include; thickness (in cm) and
current. Perform the following steps to determine volume resistivity:
1. Plot the average sample thickness (in cm) on the thickness scale.
2. Plot the test voltage value on the voltage scale.
3. Draw a straight line connecting the plotted thickness and voltage values.
Note that this line will intersect the graph line.
4. Plot the measured current value on the current scale.
5. Draw a straight line from where the first line intersects the graph line to the
plotted current value.
6. Read the volume resistivity value (in ohm-cm) from where the second line
intersects the resistivity scale.
An example is shown on the graph. The first dashed line (a) connects a sample
thickness of 0.15 cm to a test voltage of 200V. The second dashed line (b)
connects the Graph Line intersection point to a measured current of 6
×
10
-11
amps (60pA). The second dashed line (b) intersects the resistivity scale at
approximately 5
×
10
14
¾-cm (5.09
×
10
14
¾-cm by calculation).
Figure 3-3
Volume resistivity (
ρ
) nomograph
all be calculated as
icular
as follows:
16
17
Содержание 8009
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