ADLINK Technology PXIe-9834, User Manual, Page: 51 / 65

Operations 39
PXIe-9834
3.7 Synchronizing Multiple Modules
Analog input channels on a single module, sharing the same time-
base and trigger signals, are automatically synchronized. When
synchronizing analog input channels between modules, however,
correct module configuration and timebase and trigger signal wir-
ing are critical for optimum synchronization.
Digitizer modules such as the PXIe-9834 support trigger synchro-
nization and timebase synchronization.
Trigger synchronization implements a signal that initiates acquisi-
tion, and timebase synchronization provides the fundamental
clock for AD operation.
As shown in the following, two digitizer modules operating at
diverse onboard clock and trigger signals (free run) result in not
only trigger time difference, but also clock phase error.
Figure 3-14: Non-synched Digitizer Modules
CLK#1
ADC
ADC
ADC
ADC
Digitizer
Controller
Decision
Digitizer Module #1
CLK#2
ADC
ADC
ADC
ADC
Digitizer
Controller
Trigger
Decision
Digitizer Module #2
TRG#1
TRG#2
Trigger delay Clock Phase Error
TRG#1
TRG#2
CLK#1
CLK#2
Trigger