Keithley 6220 Reference Manual page 167

Model 6220/6221 Reference Manual
4.
5.
A.
B.
6.
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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
commands to set measurement units are listed in
example shows the command sequence to select average power measure-
ment units:
UNIT W
UNIT:POWer AVERage ' Select Average power type.
Set up, arm,. and run Pulse Delta – Details on the commands to set up
and arm Pulse Delta are provided in
onstrates the proper sequence to set up, arm, and run a Fixed output:
*RST
SOUR:PDEL:HIGH 10e-3
SOUR:PDEL:LOW 0
SOUR:PDEL:WIDT 500e-6
SOUR:PDEL:SDEL 100e-6
SOUR:PDEL:COUN 200
SOUR:PDEL:RANG BEST
SOUR:PDEL:INT 10
SOUR:PDEL:SWE OFF
SOUR:PDEL:LME 2
TRAC:POIN 200
SOUR:PDEL:ARM
INIT:IMM
Trace points specifies the size of the buffer. Buffer size should be the same
value as Pulse Delta count. See
mands.
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.
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:
SENS:DATA?
Return to
Delta, Pulse Delta, and Differential Conductance 5-47
' Select power (Watts) measurement units.
Table 5-4. The following example dem-
' Restores 6221 defaults.
' Sets pulse high value to 10mA.
' Sets pulse low value to 0mA.
' Sets pulse width to 500µs.
' Sets source delay to 100µs.
' Sets pulse count to 200.
' Selects the best source range.
' Sets pulse interval to 10 PLC.
' Disables sweep function.
' Set for two low pulse measurements.
' Sets buffer to 200 points.
' Arms Pulse Delta.
' Starts Pulse Delta measurements.
Section 6 for details on all buffer com-
' Reads the latest Pulse Delta reading.
Section 5 topics
for details). The
Table 5-1. The following
A
B