Keithley 6220 DC, User Manual

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Model 6220/6221 User’s Manual Delta, Pulse Delta, and Differential Conductance 5-41
Return to Section 5 topics
The following query command is used to return the response to a query
command sent over the serial port:
SYSTem:COMMunicate:SERial:ENTer?
When communicating over the serial port, there are no errors reported if a
Model 2182/2182A is not connected to the serial port.
Examples – The following commands demonstrate proper syntax for
sending commands and returning responses to queries over the serial port:
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 Sie-
mens reading (see “
Measurement units ” on page 5-11 for details). The
commands 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 Table 5-4 .
The following demonstrates the proper command sequence to set up, arm,
and run Differential Conductance for the Example in
Figure 5-10 :
SYST:COMM:SER:SEND “VOLT:RANG 2”
‘
‘ Select 2V range for 2182/
2182A.
SYST:COMM:SER:SEND “VOLT:RANG?”
‘ Send range query.
SYST:COMM:SER:ENT?
‘ Return response to query.
SYST:COMM:SER:SEND “VOLT:NPLC 1”
‘
‘ Set rate to 1PLC for 2182/
2182A.
SYST:COMM:SER:SEND “VOLT:NPLC?”
‘ Send rate query.
SYST:COMM:SER:ENT?
‘ Return response to query.
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