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Model 2790 SourceMeter
klqbp Non-sequential scanning is only intended to be performed using remote pro-
®
Switch System Reference Manual
For the above scan list, the scan will run starting with the lowest numbered channel
(101) and then sequence up (forward) to the highest numbered channel (206).
The following example shows the proper format for specifying memory pattern
locations for a scan:
ROUT:SCAN (@M1, M4, M3)
For the above scan list, the scan will scan through locations in order (M1, M4, M3).
Remote programming can also be used to run non-sequential scans. Any scan list
configured to scan backward is considered a non-sequential scan. The following
examples configure non-sequential scan lists:
Example 1) ROUT:SCAN (@101:105,103,106:110)
Example 2) ROUT:SCAN (@110:101)
Example 1 — After channel 105 is scanned, the unit backs up to scan channel 103,
then proceeds forward to scan channels 106 through 110.
Example 2 — The scan starts with channel 110, then proceeds backward to channel
101.
gramming. Unexpected results may occur if a non-sequential scan is run from
the front panel.
There must be at least two channels in the scan list. Creating a scan list that has
only one channel will generate error -221 (settings conflict).
Effects of function changes on the scan list
klqb
To avoid unexpected problems with scans (as explained after this note), it
is recommended that the scan list (ROUT:SCAN) be created AFTER scan
channel functions are selected (SENS:FUNC).
Changing from a 2-wire function to a 4-wire function will change the scan list.
This is demonstrated as follows:
The following commands show the proper sequence to configure a simple
20-channel DCV scan using a Model 7702 installed in slot 1:
SENS:FUNC 'VOLT',(@101:120)
ROUT:SCAN (@101:120)
When the scan is changed to a 4-wire function, the scan list will change. For exam-
ple, assume the above scan is changed to the Ω4 function as follows:
SENS:FUNC 'FRES',(@101:110)
For the 4-wire resistance function, channels 101 through 110 will be paired to
channels 121 through 130. ROUT:SCAN? returns the following scan list:
' Set channels for DCV.
' Specify scan list.
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