Read Commands - Keithley 6220 Reference Manual

Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-15

Read commands

Figure 5-6B also shows the read commands that can be used for remote
programming.
A Pre-math readings
SENSe[1]:DATA[:LATest]?
SENSe[1]:DATA:FRESh?
While Delta, Pulse Delta, or Differential Conductance is running, the
SENS:DATA:LATest? command can be sent to read the latest (last) pre-math
reading processed by the Model 622x. The returned reading will be filtered if the
averaging filter is enabled. If this read command is sent before a new reading is
available, the last reading will again be returned.
The SENS:DATA:FRESh? command is the same as the SENS:DATA:LATest?
command except that once a reading is returned, it cannot be returned again. This
read command guarantees that each reading gets returned only once. If a new
(fresh) reading is not available when SENS:DATA:FRESh? is sent, error -230 Data
corrupt or stale will occur.
B Post-math readings
CALCulate[1]:DATA[:LATest]?
CALCulate[1]:DATA:FRESh?
While Delta, Pulse Delta, or Differential Conductance is running and Math is
enabled, the CALC1:DATA? command can be sent to read the latest (last) post-
math reading processed by the Model 622x. If this read command is sent before a
new reading is available, the last reading will again be returned.
The CALC1:DATA:FRESh? command is the same as the CALC1:DATA? com-
mand except that once a reading is returned, it cannot be returned again. This
read command guarantees that each reading gets returned only once. If a new
(fresh) reading is not available when CALC1:DATA:FRESh? is sent, error -230
Data corrupt or stale will occur.
C Compliance test result
CALCulate3:LIMit[1]:FAIL?
While Delta, Pulse Delta, or Differential Conductance is running, source compli-
ance for a reading can be tested. The test can be set to fail when the source
enters or exits the compliance condition. A returned value of "0" indicates a pass
condition, and "1" indicates a fail condition.
Return to Section 5 topics
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