Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-55
Return to Section 5 topics
Average Current is calculated by the Model 622x as follows:
Where: AvgCurr is the Average Current corresponding to a given Differential
Conductance reading.
X, Y, and Z are the three current levels for the Differential Conductance
reading.
With Average Voltage and Average Current known (calculated by the Model 622x),
power is then calculated as follows:
Configuration settings
Differential Conductance settings from the front panel are described as follows.
These parameters are set from the DIFF CONDUCTANCE menu that is accessed
by pressing the CONFIG key and then the COND key.
The equivalent remote programming commands to configure Differential Conduc-
tance are summarized in Table 5-5.
Step – The step size specifies the size increment for each step of the sweep. In
Figure 5-14, the 10µA steps are shown by the dashed line. If the step size is set to
be larger than the start-stop interval, the step size will be readjusted to provide a
100-point Differential Conductance sweep.
Step is a magnitude and is therefore always set as a positive value. Step can be
set from 0 to 105mA. The default step size is 1µA.
Start – The start level for the sweep applies to the middle step of the first cycle. As
shown in Figure 5-14, the 0µA start level is actually the second step of the sweep.
The start level can be set from -105mA to +105mA. The default start level is -10µA.
Stop – The stop level for the sweep applies to the middle step of the last cycle. As
shown in Figure 5-14, the 50µA stop level is actually the second last step of the
sweep. The stop level can be set from -105mA to +105mA. The default start level
is +10µA.
Delta – The specified Delta is the differential current (dI) for the sweep. It is alter-
nately added to and subtracted from each subsequent step in the sweep. As
shown in Figure 5-14, 10µA is added to the odd numbered steps and then sub-
tracted from the even numbered steps. Model 2182/2182A A/D readings are per-
AvgCurr
X2YZ++
4
----------------------------=
AvgCurr
XY+()
2
-------------------
ZY+()
2
------------------+
2
---------------------------------------------=
Power AvgVolt AvgCurr×=
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