SECTION 3
Front Panel Omzration
13. Calculate the resistivity of the paper sample as
follows:
A. If the Model 6105 is configured for surface
resistivity, perform the following calculation:
o = 53.4 R, ohms
where; B is the surface resistivity of the
sample;
53.4 is a constant based on the physi-
cal dimensions of the electrodes of the
Model 6105;
R, is the V/I ohms reading from the
Model 487.
For example, if the reading on the Model 487
(R,) is 90GQ (typical for plain paper), the sur-
face resistivity of the paper sample is calcu-
lated as follows:
o = 53.4 x 90GQ = 4.8 x 10%
B. If the Model 6105 is configured for volume
resistivity, perform one of the following
calculations:
3.53
p = T RMohm-inches
I
p = F R, ohm-centimeter
c
where; p is the volume resistivity of the
sample;
3.53 is a constant based on the physi-
cal dimensions (in inches) of the elec-
trodes
of the Model 6105;
22.9 is a constant based on the physi-
cal dimensions (in centimeters) of the
electrodes of the Model 6105;
R, is the V/I ohms reading from the
Model 487;
ti is the thickness of the sample in
inches;
t, is the thickness of the sample in cen-
timeters.
For example, if the reading on the Model 487
(R,) is 90GQ and the thickness of the paper
sample is 5 mils, the volume resistivity is calcu-
lated as follows:
3.53
_ 90GR = 6.35 x 10’30hm-inches
p = 0.005
3.15 SOURCE VOLTAGE/MEASURE
CURRENT (Model 487)
For V/I ohms measurements (see paragraph 3.7), the
Model 487 is configured to source voltage and measure
current. The following paragraphs will summarize how
to use the Model 487 in other test systems that require
the instrument to source voltage and measure current
(Source V/Measure I).
NOTE
An operating example to perform resistivity
tests is contained in paragraph 3.142.
3.15.1 Basic Source V/Measure I
Configuration
The most common configuration to source V and
measure I, as used for V/I ohms measurements, is
shown in Figure 3-10. In this configuration the V-source
and picoammeter are separately connected to the test
fixture.
NOTE
Do not connect signal low to ANALOG
OUTPUT LO. Always use INPUT LO for
input signals.
3-31
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