Dataman 520 Series - Manual (Page 16)

DATAMAN oscilloscope
User’s Guide
The trigger circuits of the DATAMAN 570 series DSOs are equipped with Hold Off
timer (TDL). It blocks the triggering event for a time period T=4*H*Ts from the start
of data acquisition, where Ts is the actual real time sampling period and H is the user
selectable value from 0 to 32767. It is important to set the proper value H to ensure
that the hardware of the oscilloscope acquires the proper amount of data before the
triggering event. For example, if we want to display the waveform for the time period
of Tz before the trigger it is necessary to set T >= Tz to ensure that all of the data will
be displayed. The DATAMAN 570 series oscilloscopes have four triggering modes
available:
AUTO – Data acquisition is triggered by a valid trigger event. However, when after a
certain time the trigger event does not occur, measurement starts.
NORMAL – Data acquisition is triggered by a valid trigger event.
SINGLE – Data acquisition starts after activation from the control panel and it is
synchronized by the valid trigger event. Just one measuring cycle is executed.
MANUAL – One measuring cycle is executed immediately after activation from the
control panel.
2.1.3. Data acquisition
The simplified block schematics of data acquisition is shown in Figure 2.1.3.1.
REG
CMP
ACC
ADC
M
SD
DATA
A/B
clk
trg
done
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