HP VXI E1432A - Manual (Page 60)

Parameter Settings
Many parameters are channel-dependent, meaning that each channel can be
set independently of the others in the module. Other parameters are
module-dependent; changing a module-dependent parameter for a channel
will change it for all channels on that module. For example, changing
blocksize, a module-dependent parameter, for input channel 3 will also
change the block size for all other channels in the same HP E1432A module
as channel 3.
When possible, parameters are written to the hardware as soon as they are
received. Sometimes, the parameter can’t be written to the hardware until
the start of a measurement; in this case the value of the parameter is saved
in RAM in the HP E1432A module until the measurement is started with
hpe1432_initMeasure. Some parameters can be changed while a
measurement is running, but many do not take effect until the next start of
a measurement.
Measurement Initiation
This section describes the measurement initiation process in the HP E1432A.
The measurement initialization states, and the corresponding Sync/Trigger
line transitions (with ‘H’ for high, ‘L’ for Low) are:
The module enters the TESTED state after a reset. In this state, all of the
module parameters may be set. The HP E1432A stays in the TESTED state
until it sees a high-to-low transition of the Sync/Trigger line.
L H L H L H L H
Sync/Trigger line
Tested Booting Pre-arm Booted Settling Idle
Figure 3-14: Measurement initialization
HP E1432A User's Guide
Using the HP E1432A
3-21
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