Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-47
Return to Section 5 topics
4. Set measurement units – Volts are the default units for the Model 6221
but can instead be expressed (and displayed) as an Ohms, Watts, or Sie-
mens reading (see “Measurement units,” on page 5-16 for details). The
commands to set measurement units are listed in Table 5-1. The following
example shows the command sequence to select average power measure-
ment units:
5. Set up, arm,. and run Pulse Delta – Details on the commands to set up
and arm Pulse Delta are provided in Table 5 -4 . The following example dem-
onstrates the proper sequence to set up, arm, and run a Fixed output:
A. Trace points specifies the size of the buffer. Buffer size should be the same
value as Pulse Delta count. See
Section 6 for details on all buffer com-
mands.
B. The initiate command starts Pulse Delta readings. After the specified finite
number of Pulse Delta readings are performed, Pulse Delta will stop run-
ning. At this point another initiate command will re-start Pulse Delta. New
Pulse Delta readings will overwrite the old Pulse Delta readings in the
Model 6221 buffer.
If the INFinity count is set, Pulse Delta will run continuously. If the buffer
fills, Pulse Delta readings will stop being stored, even though Pulse Delta
continues to run.
6. Read Pulse Delta readings – While Pulse Delta is running, the latest
Model 2182A Pulse Delta reading can be read by the Model 6221 using the
following command:
UNIT W
‘ Select power (Watts) measurement units.
UNIT:POWer AVERage ‘ Select Average power type.
*RST ‘ Restores 6221 defaults.
SOUR:PDEL:HIGH 10e-3 ‘ Sets pulse high value to 10mA.
SOUR:PDEL:LOW 0 ‘ Sets pulse low value to 0mA.
SOUR:PDEL:WIDT 500e-6 ‘
Sets pulse width to 500µs.
SOUR:PDEL:SDEL 100e-6 ‘
Sets source delay to 100µs.
SOUR:PDEL:COUN 200 ‘
Sets pulse count to 200.
SOUR:PDEL:RANG BEST ‘
Selects the best source range.
SOUR:PDEL:INT 10 ‘
Sets pulse interval to 10 PLC.
SOUR:PDEL:SWE OFF ‘
Disables sweep function.
SOUR:PDEL:LME 2 ‘
Set for two low pulse measurements.
TRAC:POIN 200 ‘
Sets buffer to 200 points.
A
SOUR:PDEL:ARM ‘ Arms Pulse Delta.
INIT:IMM ‘ Starts Pulse Delta measurements.
B
SENS:DATA? ‘ Reads the latest Pulse Delta reading.
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