Keithley 2601 Reference Manual

2600S-901-01 Rev. C / January 2008 Return to Section Topics 5-5
Series 2600 System SourceMeter® Instruments Reference Manual Section 5: Sweep Operation
Figure 5-3
Logarithmic staircase sweep
Delay
Delay
Delay
Delay
Stop
(10)
Measure
#1
Measure
#2
Measure
#3
Measure
#5
X = Measurement Point
X
X
X
X
Delay
X
Measure
#4
Log Points = 5
1
10
5.6234
3.1623
1.7783
Volts
Log
Scale
Start
(1V to 10V, five steps)
The programmable parameters for a log sweep include the source function, channel, start and
stop levels, delay (settling time), and the number of measurement points for the sweep. The
specified start, stop, and points parameters determine the logarithmic step size for the sweep. The
delay parameter determines the time period before each measurement at each step.
Step size for the sweep in Figure 5-3 is calculated as follows:
o
Log Step Size
log10(stop) log10(start)–
Points 1–
------------------------------------------------------------------=
log10(10) log10(1)–
51–
-----------------------------------------------------=
10–()
4
-----------------=
0.25=
⎠
⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎞
⎠
⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎞
Thus, the five log steps for this sweep are 0, 0.25, 0.50, 0.75, and 1.00. The actual SourceMeter
levels at these points are listed in
Table 5-1 (the voltage level is the anti-log of the log step).
Table 5-1
Logarithmic sweep points
Measure
point
Log step Source level (V)
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

Keithley 2601 Specifications

General

Brand	Keithley
Model	2601
Category	Measuring Instruments
Language	English