7-10 Scanning Model 2701 User’s Manual
Reading count
NOTE For both STEP and SCAN, the reading count specifies the number of readings to
store in the buffer.
STEP operation — The reading count specifies the number of channels to scan. This can
be equal to, less than, or greater than the number of channels in the scan list. The last
scanned channel remains closed. If you start the scan again, it will start at the next
channel.
If the reading count is set to infinity (INF), the scan will continuously repeat until you
stop it.
NOTE One counter is used for STEP operation. As shown in Figure 7-1, reading count
sets the Trigger Counter.
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.
NOTE As shown in Figure 7-2, two counters are used for SCAN operation. The Trigger
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.
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.
To Next Page
Loading...
Need help?
General
