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Chapter 4 Features and Functions
Scanning
4
4
Scanning
The Agilent 3499A/B/C can scan switching channels, digital I/O bit
channels, and stored channel setups in a scan list. When a scan starts,
the first channel in a scan list is closed. The channel is then opened and
the next channel in the list is closed. This process repeats for all
channels in the scan list. You can sweep through a scan list more than
once. You can also synchronize scanned channel closures with external
measurement devices.
Rules for Scanning
•
A scan list must be specified before initiating a scan. One or more
switching channels, digital I/O bit channels, and/or previously stored
channel setups can be included in a scan list. The order of the
channels in the scan list determines the order of the channels to be
scanned.
•
If any plug-in module is installed or removed while the instrument is
operating, the instrument will automatically perform a reset and the
current scan list is cleared.
•
If a scan list contains a non-existing channel, the scan cannot be
performed and an error will occur.
•
If a scan list contains a channel on a digital I/O module that is not
configured to handshake mode #1 or mode #2 (see page 98), the scan
cannot be performed and an error will occur.
•
If a mismatch between a stored channel setup in the scan list and the
current hardware configuration is found, a scan cannot be performed
and an error will occur. When a stored setup is included in the scan
list, the stored setup is recalled and the next channel in the scan list
is switched.
•
When a scan is aborted, the channel last scanned before the
interruption will remain closed. Aborting a scan does not affect the
present scan configuration. A scan cannot resume from where it is
interrupted. To initiate a new scan, the channels in the scan list will
be scanned from the beginning of the scan list.
•
A scan list may contain up to 200 entries.
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