5-62 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 Reference Manual
Return to Section 5 topics
4. 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 for details). The com-
mands to set measurement units are listed in Table 5-1. The following
example shows the command to select conductance (Siemens) measure-
ment units:
5. Set up, arm, and run Differential Conductance – Details on the com-
mands to set up and arm Differential Conductance are provided in Ta bl e 5- 5.
The following demonstrates the proper command sequence to set up, arm,
and run Differential Conductance for the example in Figure 5-14:
A. 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.
B. 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.
6. 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:
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.
UNIT S
‘ Select Siemens measurement units.
*RST ‘ Restores 622x defaults.
SOUR:DCON:STARt 0 ‘ Sets start value to 0µA.
SOUR:DCON:STEP 10e-6 ‘ Sets step size to 10µA.
SOUR:DCON:STOP 50e-6 ‘ Sets stop value to 50µA.
SOUR:DCON:DELTa 20e-6 ‘ Sets delta value to 20µA.
SOUR:DCON:DELay 1e-3 ‘ Sets delay to 1ms.
SOUR:DCON:CAB ON ‘ Enables Compliance Abort.
TRAC:POIN 6 ‘ Sets buffer size to six points.
A
SOUR:DCON:ARM ‘ Arms Differential Conductance.
INIT:IMM ‘ Starts measurements.
B
SENS:DATA? ‘ Reads the latest Delta reading.
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