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Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 3: Functions and features

2657A-901-01 Rev. B/December 2012 3-25

In this example:

A = 0, V

start

= 100, V

end

= 1000, N = 5

Using the formula above, k = 1

Step size (b) for the sweep in the above figure is calculated as follows:

Figure 37: Logarithmic staircase sweeps (2)

Therefore, b = 10

(log step size)

= 1.7783

The five log steps for this sweep are listed in the Logarithmic sweep points table below.

Logarithmic sweep points

Source point (N) Source level (V) Step number (i)

1 100 0

2 177.83 1

3 316.23 2

4 562.34 3

5 1000 4

When this sweep starts, the output will go to the start level (100 V) and sweep through the

symmetrical log points.

To configure a logarithmic staircase sweep, use the smua.trigger.source.logY()function. This

function configures the source values the source-measure unit (SMU) will output when performing a

logarithmic sweep. After configuring the sweep, you must also enable the source action by setting the

following attribute:

smua.trigger.source.action

Example:

-- Configure a sweep from 100 to 1000 V in 10 steps with an asymptote of 0 V.

smua.trigger.source.logv(100, 1000, 11, 0)

-- Enable the source action.

smua.trigger.source.action = smua.ENABLE

For more information, see smuX.trigger.source.logY() (on page 7-244).

Keithley 2657A User Manual

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