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q Calling hpe1432_createChannelGroup to delete a group that is simultaneously
being used by non-interrupt-handler code.
q Calling one of the read data functions (hpe1432_readRawData or
hpe1432_readFloat64Data), if the non-interrupt-handler code is also calling one
of these functions.
q Calling hpe1432_init to reset the list of channels that are available to the
HP E1432A library.
As is always the case with interrupt handlers, it is easy to introduce bugs
into your program, and generally hard to track down these bugs. Be careful
when writing this function.
Data Gating
Sometimes you may wish to monitor data from some input channels and not
others. The function hpe1432_setEnable enables or disables data from an
input channel (or group of channels). If data is enabled, then the data can
be read using hpe1432_blockAvailable and hpe1432_readRawData or
hpe1432_readFloat64Data. If data is disabled, data from the specified
channel is not made available to the host computer.
This parameter can be changed while a measurement is running, to allow
the host computer to look at only some of the data being collected by the
HP E1432A module. While data from a channel is disabled the input
module continues to collect data but it is not made available to the host
computer. The host can then switch from looking at some channels to
looking at others during the measurement. In contrast, the function
hpe1432_setActive completely enables or disables a channel and can’tbe
changed while a measurement is running.
For order tracking measurements this function can be used to switch
between receiving order tracking data, ordinary time data, or both.
HP E1432A Parameters
Some parameters, such as range or coupling, apply to specific channels.
When a channel ID is given to a function that sets a channel-specific
parameter, only that channel is set to the new value.
Some parameters, such as clock frequency or data transfer mode, apply
globally to a module. When a channel ID is used to change a parameter
that applies to a whole module, the channel ID is used to determine which
module. The parameter is then changed for that module.
Starting and stopping a measurement is somewhat like setting a global
parameter. Starting a measurement starts each active channel in each
module that has a channel in the group.
HP E1432A User's Guide
Using the HP E1432A
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