ADLINK Technology USB-1901, User Manual

Page: 59 / 84

Operation 45
USB-1900 Series
USB-1900 Series starts to acquire data. The total acquired data
length = NumChan_counter * PSC_counter.
Figure 4-8: Delayed Trigger
4.4.3 Post-Trigger or Delayed-Trigger Acquisition with
Retriggering
Post-trigger or Delayed-Trigger acquisition with re-trigger function
is indicated where you want to collect data after several trigger
events. The number of scans after each trigger is specified in
PSC_counter, and Retrig_no can be programmed to specify the
re-trigger numbers. An example is shown, in which two scans of
data are acquired after the first trigger signal, after which the
USB-1900 Series waits for the next re-trigger signal (re-trigger sig-
WARNING:
When the Delay_counter clock source is set to timebase, the
maximum delay time = 2
32
/80M s = 18.626ms
(NumChan _Counter=4, PSC_Counter=3)
Acquisition_in_progress
Scan_start
AD_conversion
Acquired & Stored Data
(3 scans)
Operation start
Trigger
Delay until
Delay_Counter
reaches 0