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7-10
SCAN operation — When a scan is started, one or more complete scans will be performed.
The number of channels in the scan list determines the number of channels for each scan.
The reading count determines the number of scans to perform and is best explained by an
example. Assume there are 10 channels in the scan list. If you set the reading count to 10 or
less, one scan of the 10 channels will be performed. If you set the reading count to any value
from 11 to 20, two scans will be performed. A reading count from 21 to 30 gives you three
scans, and so on.
If the reading count is set to infinity (INF), the scan will continuously repeat until you
stop it.
klqb
Output trigger
STEP operation — After each channel is scanned, an output trigger is applied to the rear
panel Trigger Link connector.
SCAN operation — After all channels in the scan list are scanned, an output trigger is
applied to the rear panel Trigger Link connector.
7751/7752/7753 module scanning
The Model 2790 can scan through the memory pattern locations for up to two installed
Keithley Model 7751/7752/7753 modules. Each memory pattern can include source level,
measurement function (DCV, Ω2, and Ω4 only), and channels to close.
klqb
Readings for scanned memory pattern locations are automatically stored in the buffer.
With buffer auto clear enabled (which is the default), the buffer clears when the scan is
started. When disabled, scan readings are appended to the buffer. The
TRACe:CLEar:AUTO <b> command is used to enable/disable buffer auto clear
(Section
As shown in
Figure
7-2, two counters are used for SCAN operation. The Trig-
ger counter controls the number of scans, and the Sample Counter controls the
number of channels for each scan. The number of channels in the scan list and
the programmed reading count automatically sets the Trigger Counter and the
Sample Counter.
The Sample Count is equal to the scan list length. For example, if channels 101,
102, and 103 are programmed to be scanned, the Sample Count is 3.
Memory patterns can be set up only via remote. No front panel configuration is
available. 7702 module channels can also be included in a memory pattern
locations. See
"Memory patterns" page 2-36
memory patterns. Once memory patterns are defined, they can be scanned by
placing them in the scan list as covered below.
6).
Model 2790 SourceMeter
®
Switch System Reference Manual
for complete details on setting up
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