User Manual

2400 Series SourceMeter
®
User’s Manual Sweep Operation 10-5
The programmable parameters for a log sweep include the start and stop levels
and the number of measurement points for the sweep. The specified start, stop,
and point parameters determine the logarithmic step size for the sweep. Step size
for the sweep in Figure 10-2 is calculated as follows:
Thus, the five log steps for this sweep are 0, 0.25, 0.50, 0.75, and 1.00. The actual
V-Source levels at these points are listed in Table 10-1 (the V-Source level is the
anti-log of the log step).
When this sweep is triggered to start, the output will go from the bias level to the
start source level (1V) and sweep through the symmetrical log points. With trigger
delay set to zero, the time duration at each step is determined by the source delay
and the time it takes to perform the measurement (NPLC setting).
Abort on compliance
This feature aborts a sweep in progress if compliance is detected. There are three
modes, never, early, and late. Never turns off the feature, early will abort as soon
as compliance is detected at the beginning of the SDM cycle, and late aborts at
the end of the SDM cycle. See “Configuring and running a sweep” on page 10-12.
Table 10-1
Logarithmic sweep points
Measure point Log step V-Source level (volts)
Point 1
Point 2
Point 3
Point 4
Point 5
0
0.25
0.50
0.75
1.0
1
1.7783
3.1623
5.6234
10
Log Step Size
log10(stop) log10(start)–
Points 1–
-------------------------------------------------------------=
log10(10) log10(1)–
51–
--------------------------------------------------=
10–()
4
----------------=
0.25=