Keithley 6482 - Page 92

6482-901-01 Rev. A / August 2012 Return to Section Topics 7-3
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 7: Sweep Operation
Figure 7-2
Logarithmic staircase sweep (example 5-point sweep from 1 to 10 volts)
The programmable parameters for a logarithmic 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 7-2 is
calculated as follows:
Thus, the five logarithmic steps for this sweep are 0, 0.25, 0.50, 0.75, and 1.00. The actual voltage
bias levels at these points are listed in Table 7-1 (the voltage bias level is the antilogarithm of the
logarithmic step).
Start
Bias
Stop
(10)
Measure
#1
Measure
#2
Measure
#3
Measure
#5
X = Measurement point
X
X
X
X
X
Measure
#4
1
10
5.6234
3.1623
1.7783
Delay
Delay
Delay
Delay
Delay
Logarithmic
Scale
Log
points = 5
Volts
logarithmic step size
log
10
(stop) - log
10
(start)
points - 1
=
log
10
(10) - log
10
(1)
5 - 1
=
1 - 0
4
=
0.25=