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The following equation can be used to calculate any Delta reading:
X 2Y
–
+
------------------------- -
Delta
=
4
Where:
X, Y, and Z are the three A/D measurements for a Delta reading.
n = Delta Cycle Number – 1
Example – Calculate the 21st Delta reading:
X, Y, and Z are the three A/D measurements for the 21st Delta reading.
n = Delta Cycle Number – 1
= 21 – 1
= 20
Therefore,
Delta
n
The (-1)
term in the Delta calculation is used for polarity reversal of every other
calculated Delta reading. This makes all calculated Delta readings in the test the same
polarity.
Delta, Pulse Delta, and Differential Conductance
Z
n
•
(
1 –
)
X 2Y
–
+
Z
=
------------------------- -
•
4
X 2Y
–
+
Z
=
------------------------- -
4
20
(
1 –
)
I-7
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