Chapter2 HardwareOverview
NIPXI-562x User Manual 2-6 ni.com
afree-running state, in which the acquisitionclock is not synchronized to
anyexternal reference.
The voltagecontrolled crystal oscillator (VCXO) is a 64 MHz clock.
The trigger and clock routing area directs clock signals and triggers.
The TIO is the timing engine used for the NI 562x.
The MITE is the PXI businterface. The MITE p rovideshigh-speed direct
memory access(D MA) transfers from the NI 562xto the host computer
memory.
Other Features
This section contains information on other features on the NI 562x.

Multiple-Record Acquisitions

Afterthe trigger has been received and the posttrigger samples have been
stored,y ou can configure the NI 562xto begin another acquisition that is
stored in anotherm emory record on thed evice. This process isa
multiple-record acquisition. To perform multiple-record acquisitions,
configure the NI 562xto the number of records to be acquired before
starting the acquisition. The NI 562xacquires an additional record each
time atrigger is accepted until all the requested records are stored
in memory. After the initial setup, this process does not require software
intervention.
Between each record,a dead time existsduring which the trigger is not
accepted.If the record length is greater than 80 µs, the dead time is 500 ns.
If,however, the record length is less than 80 µs, the dead time is 80 µs.
During this time,the memory controller sets up for the next record. Also,
additional dead time may exist while the minimum number of pretrigger
samples are being acquired.