Keithley Series 2600 User Manual

2-7
SECTION 2
Two-terminal Device Tests
The instrument output is then turned off and the function
Print _ Data() is run to print the data to the TSB window. To
graph the results, simply copy and paste the data into a spread-
sheet such as Microsoft Excel and chart.
2.5.6 Using Log Sweeps
With some devices, it may be desirable to use a log sweep because
of the wide range of currents necessary to perform the test. Pro-
gram 3B performs a log sweep of the diode current.
If your computer is currently connected to the Internet, you can
click on this link to begin downloading ‘Diode_Fwd_Char_Log.
tsp’: http://www.keithley.com/data?asset=50923.
Note that the start and stop currents are programmed just as
before, although with a much wider range than would be practical
with a linear sweep. With log sweep, however, the points param-
eter, which defines the number of points per decade, replaces the
steps parameter that is used with the linear sweep.
To run the Log sweep, we must send the code to the instrument.
One method is simply to right-click in the open script window
of TSB, and select ‘Run as TSP file’. This will compile the code
and place it in the volatile run-time memory of the instrument.
To store the program in non-volatile memory, see the “TSP Pro-
gramming Fundamentals” section of the Series 2600 Reference
Manual.
Once the code has been placed in the instrument run-time
memory, we can run it at any time simply by calling the function
‘Diode_Fwd_Char_Log()’. This can be done by typing the text
‘ Diode _ Fwd _ Char _ Log() ’ after the active prompt in the
Instrument Console line of TSB.
2.5.7 Using Pulsed Sweeps
In some cases, it may be desirable to use a pulsed sweep to avoid
device self-heating that could affect the test results. Program 3C
performs a staircase pulse sweep. In this program, there are two
additional variables ton and toff, where ton is the source on dura-
tion and toff is the source off time for the pulse. During the toff
portions of the sweep, the source value is returned to the ilevel
bias value.
If your computer is currently connected to the Internet, you can
click on this link to begin downloading ‘Diode_Fwd_Char_Pulse.
tsp’: http://www.keithley.com/data?asset=50922.

Keithley Series 2600 Specifications

General

Model	Series 2600
Measurement Functions	Voltage, Current, Resistance, Power
Resolution	Up to 6.5 digits
Current Source Range	Up to 10A
Communication Interfaces	GPIB, USB
Applications	Semiconductor testing
Category	Source Measure Unit (SMU)
Channels	Single or Dual Channel (varies by model)