Model 6220/6221 Reference Manual Delta, Pulse Delta, and Differential Conductance 5-13
Return to Section 5 topics
Aborting the delta test
A delta test that is armed (or running) can be aborted by pressing the EXIT key or
sending the SOUR:SWE:ABOR command.
Interlock
In order to start an armed Delta, Pulse Delta, or Differential Conductance test, a
test fixture interlock switch must be connected to the INTERLOCK connector on
the rear panel of the Model 622x. Closing the interlock switch will enable the
OUTPUT allowing it to be turned on. For details, see “INTERLOCK,” on page 2-4.
Data flow and read commands
Data flow
The Model 622x does not perform measurements. However, raw readings are
sent from the Model 2182/2182A to the Model 622x to calculate Delta, Pulse
Delta, or Differential Conductance readings. Readings from the Model 2182/
2182A are processed, stored, and displayed by the Model 622x.
Figure 5-6A shows data flow for front panel operation. The delta reading is calcu-
lated as a voltage (V) reading, but can be changed into its equivalent watts (W),
ohms (Ω), or siemens (S) reading. See page 5-16 for details on “Measurement
units”.
The reading can then be filtered and/or modified by a built-in math calculation. An
averaging filter can be used to stabilize noisy readings (see “Error and status
messages,” on page 5-18 and Section 6 for details). With math enabled, the
mX+b, or m/X+b calculation is applied to the delta reading (see Section 6 for
details). When the filter and/or math is disabled, the delta reading simply fall
through to the next block in the diagram.
For front panel operation, readings are automatically stored in the buffer and dis-
played. Stored readings, as well as buffer statistics for those readings, can be dis-
played (recalled). See Section 6 for details.
Figure 5-6B shows data flow for remote operation. It is similar to data flow for front
panel operation with the following enhancements:
• Compliance testing – The current source can be tested for compliance.
The test can be set to fail when the source enters the compliance condition.
See Section 9 for details.
• Buffer control – When enabled, buffer feed can be pre-math readings or
post-math readings. When disabled, readings will not be stored in the
buffer. See Section 6 for details.
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