Keithley 6220 User Manual

Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-29
Return to Section 5 topics
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 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 ohms measurement units:
5. Set up, arm, and run Delta – Details on the commands to set up and arm
Delta are provided in Table 5-3. The following example demonstrates the
proper sequence to set up, arm, and run Delta:
A. Trace points specifies the size of the buffer. Buffer size should be the same
value as Delta count. See
Section 6 for details on all buffer commands.
B. The initiate command starts Delta readings. After the specified finite num-
ber of Delta readings are performed, Delta will stop running. At this point
another initiate command will re-start Delta. New Delta readings will over-
write the old Delta readings in the Model 622x buffer.
If the INFinity count is set, Delta will run continuously. If the buffer fills,
Delta readings will stop being stored, even though Delta continues to run.
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 OHMS Select ohms measurement units.
*RST ‘ Restores 622x defaults.
SOUR:DELT:HIGH 1e-3 ‘ Sets high source value to 1mA.
SOUR:DELT:DELay 100e-3 ‘ Sets Delta delay to 100ms.
SOUR:DELT:COUN 1000 ‘ Sets Delta count to 1000.
SOUR:DELT:CAB ON ‘ Enables Compliance Abort.
TRAC:POIN 1000 ‘ Sets buffer to 1000 points.
A
SOUR:DELT:ARM ‘ Arms Delta.
INIT:IMM ‘ Starts Delta measurements.
B
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Keithley 6220 Specifications

General

Brand	Keithley
Model	6220
Category	Measuring Instruments
Language	English