User manual

5-18 Delta, Pulse Delta, and Differential Conductance Model 6220/6221 User’s Manual

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 “Delta” on page 5-13 for details). The commands to set mea-

surement 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 5-2. 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.

SOUR:DELT:ARM ‘ Arms Delta.

INIT:IMM ‘ Starts Delta measurements.