4: Closing and Opening Switching Module Channels Series 3700 System Switch/Multimeter
-8 Document Number: 3700S-900-
close count: indicates how many times the relay for a channel has closed. A backplane relay
has a close count associated with it as well.
DMM configuration: indicates the DMM function tied to a mux channel along with that
function's pertinent attributes. This is the only attribute that is available to channel patterns
(Channel pattern operation (on page 4-2)). As long as the channel is not opened or closed
through a channel pattern, verification that the channel supports the function associated with the
DMM configuration will take place. No verification will occur for a channel pattern, therefore the
user must be sure that the channel pattern and DMM configuration are safe to be associated
together.
The system will allow for the pole setting and DMM configuration of a channel to contradict each
other without causing an error. This means that the DMM configuration may have a channel
configured for 2-pole measuring operation (for example, DC volts) while the pole setting may be
configured for 4-pole. Or, a channel may have a DMM configuration of 4-wire ohms while the
pole settings is at 2-pole. The operation being requested indicates the setting used. For DMM
operations (dmm.close or dmm.open), the DMM configuration will be used, but for channel
operations (channel.close, channel.open, channel.exclusiveclose and
channel.exclusiveslotclose), the pole configuration setting will be used.
DMM configurations:
are part of saved setup data and restored when a setup is recalled.
are deleted with a system reset but, not affected by a DMM reset alone (dmm.reset ICL)
have 32K of memory available for each channel pattern to store data.
The number of DMM configurations 32K can store varies with the number of characters stored.
If each DMM configuration is 6 characters long, 78 temperature configurations can be stored
(temperature has 41 unique DMM associated attribute settings). However, with the function set
to DC volts, with each name still being 6 characters long, 99 DMM configurations can fit in 32K
(DC volts only has 31 unique DMM associated attribute settings). Use the DMM configuration
query command to determine how many attributes are associated with a function (see
dmm.configure.query).
Duality with example
Since the switching channels of a Series 3700 support the concept of "duality", each channel
has specific settings for switching and specific settings for switching with DMM operations.
Recall that to achieve the duality, the location of the specific operation request determines the
setting that activates. An operation request residing in the channel logical device causes the
switching settings to be used; an operation request residing in the DMM logical device causes
the DMM settings to be used. The following example illustrates this concept.
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