Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-21
Return to Section 5 topics
Model 622x measurement process
When the Model 622x Current Source is used with the Model 2182/2182A to per-
form Delta measurements, an advanced, moving-average algorithm is used for
the Delta process. This process provides improved accuracy (3-point voltage
measurements) and increased speed over the fundamental Delta process.
Delta measurement technique
The Delta process is shown in Figure 5-7. As shown, three Model 2182/2182A
A/D conversions are performed to yield a single Delta reading. When Delta starts,
three Model 2182/2182A A/Ds (A, B, and C) are performed and the Delta reading is
calculated. After the 1st Delta cycle, the moving-average technique is then used. As
shown, a Delta reading is yielded for every subsequent Model 2182/2182A A/D. The
new A/D replaces the oldest A/D in the Delta calculation.
NOTE The previous discussion on the fundamental Delta pro-
cess is provided as background information to summarize
delta measurements using a conventional bipolar current
source.
The following information refers to an enhanced Delta op-
eration using the Model 622x with a Model 2182/2182A.
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