Keithley 2182

Delta, Pulse Delta, and Differential Conductance
I-7
The follo
wing equation can be used to calculate any Delta reading:
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,
The (-1)
n
term in the Delta calculation is used for polarity re
versal of every other
calculated Delta reading. This makes all calculated Delta readings in the test the same
polarity.
Delta
X 2Y– Z+
4
--------------------------


1–()
n
•=
Delta
X 2Y– Z+
4
--------------------------


1–()
20
•=
X 2Y– Z+
4
--------------------------=