Keithley 6220 Reference Manual page 182

5-62 Delta, Pulse Delta, and Differential Conductance
4.
5.
A.
B.
6.
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Set measurement units – Volts are the default units for the Model 622x but
can instead be expressed (and displayed) as an Ohms, Watts, or Siemens
reading (see "Measurement units," on page 5-16
mands to set measurement units are listed in
example shows the command to select conductance (Siemens) measure-
ment units:
UNIT S
Set up, arm, and run Differential Conductance – Details on the com-
mands to set up and arm Differential Conductance are provided in
The following demonstrates the proper command sequence to set up, arm,
and run Differential Conductance for the example in
*RST
SOUR:DCON:STARt 0
SOUR:DCON:STEP 10e-6
SOUR:DCON:STOP 50e-6
SOUR:DCON:DELTa 20e-6
SOUR:DCON:DELay 1e-3
SOUR:DCON:CAB ON
TRAC:POIN 6
SOUR:DCON:ARM
INIT:IMM
Trace points specifies the size of the buffer. Buffer size should be the same
value as the number of Differential Conductance readings in the test. See
Section 6 for details on all buffer commands.
The initiate command starts Differential Conductance readings. After all
Differential Conductance readings are performed, Differential Conductance
will stop running. At this point another initiate command will re-start Differ-
ential Conductance. New Differential Conductance readings will overwrite
the old Differential Conductance readings in the Model 622x buffer.
Read Differential Conductance readings – While Differential Conduc-
tance is running, the latest Model 2182/2182A reading can be read by the
Model 622x using the following command:
SENS:DATA?
The above read command reads the last Differential Conductance reading
that was performed by the Model 2182/2182A. If this command is sent
before a new reading is available, the last Differential Conductance reading
will again be returned.
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Model 6220/6221 Reference Manual
Table
' Select Siemens measurement units.
' Restores 622x defaults.
' Sets start value to 0µA.
' Sets step size to 10µA.
' Sets stop value to 50µA.
' Sets delta value to 20µA.
' Sets delay to 1ms.
' Enables Compliance Abort.
' Sets buffer size to six points.
' Arms Differential Conductance.
' Starts measurements.
' Reads the latest Delta reading.
Section 5 topics
for details). The com-
5-1. The following
Table 5-5.
Figure 5-14:
A
B