Model 6220/6221 User’s Manual
Delta, Pulse Delta, and Differential Conductance
5-37
Return to
Differential Conductance calculations
dV calculations
While the dV calculations for the first six dV readings are shown in
,
the following formula can be used to calculate any dV reading in the test:
Where: X, Y, and Z are the three A/D measurements for a dV reading.
n = Reading Number – 1
Example
– Calculate the 21st dV reading:
X, Y, and Z are the three A/D measurements for the 21st dV reading.
n = Reading Number – 1
= 21 – 1
= 20
Therefore:
The (-1)
n
term in the dV calculation is used for polarity reversal of every other
calculated dV reading. This makes all calculated dV readings in the test the same
polarity.
Simplified dV calculation
The above dV calculation can be simplified as follows:
dV
X
Y
–
(
)
2
------------------
Z
Y
–
(
)
2
------------------
+
2
--------------------------------------------
1
–
(
)
n
•
=
dV
X
Y
–
(
)
2
------------------
Z
Y
–
(
)
2
------------------
+
2
--------------------------------------------
1
–
(
)
20
•
=
X
Y
–
(
)
2
------------------
Z
Y
–
(
)
2
------------------
+
2
--------------------------------------------
=
dV
X
Y
–
Z
Y
–
+
2
----------------------------------
2
----------------------------------
1
–
(
)
n
•
=
dV
X
2Y
–
Z
+
4
---------------------------
1
–
(
)
n
•
=
Summary of Contents for 6220 DC
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Page 36: ...1 20 Getting Started Model 6220 6221 User s Manual Return to Section 1 topics...
Page 131: ...6 10 Averaging Filter Math and Buffer Model 6220 6221 User s Manual Return to Section 6 topics...
Page 148: ...A Specifications...
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