Figure 5-6 Delta Measurement Technique - Keithley 6220 DC User Manual

5-14 Delta, Pulse Delta, and Differential Conductance
Figure 5-6
Delta measurement technique
The following equation can be used to calculate any Delta reading:
Delta
Where:
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
The (-1)
calculated Delta reading. This makes all calculated Delta readings in the test the
same polarity.
1st Delta Reading
2nd Delta Reading
⎛ ⎞
X 2Y – + Z
• – ( )
-------------------------- -
= 1
⎝ ⎠
4
X, Y, and Z are the three A/D measurements for a Delta reading.
n = Delta Cycle Number – 1
⎛ ⎞
X 2Y Z
– +
• – ( )
-------------------------- -
1
=
⎝ ⎠
4
X 2Y – + Z
= -------------------------- -
4
n
term in the Delta calculation is used for polarity reversal of every other
Return to
DELTA DELTA
Reading Reading
1st 3rd
DELTA
Reading
2nd
· 3rd Delta Reading
· 4th Delta Reading
n
20
Section 5 topics
Model 6220/6221 User's Manual
DELTA
Reading
4th
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