GW Instek GDS-800 Series - Page 36

GDS-800 Series Digital Storage Oscilloscope Operation Manual
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z Coupling DC/AC: Press the F2 softkey to select DC coupling or AC coupling.
z Rejection LF/HF/Off: Press F3 softkey to switch off the frequency reject mode.
z Previous Menu: Back to previous menu.
Advance Triggering
z Type Delay: The advance delay trigger system includes a start trigger signal
and a 2nd trigger source (main trigger). The start trigger signal generated from
external trigger. When using the advance trigger system, user can delay the
acquisition of a waveform for a user-defined time or a user-defined number of
delayed trigger events after a start trigger signal. Press the F2, F3, and F4
softkey to select three advance delay trigger settings: By Time, By Event, and
TTL/ECL/USER.
z By Time: After the specified user-defined delay timer times out (from external
trigger), the oscilloscope will triggers on the edge which been specified. Rotate
the VARIABLE knob to select the specific delay time. (The adjustable delay
time range: 100ns~1.3ms).
If the external trigger is applied, the true trigger will be applied by the CH1 (or
CH2) trigger after the elapse of set time.
Trigger Point
Main trigger
(From CH1 or CH2)
Start trigger
(From external)
Trigger
Set time (T)
Figure 5-18: The start trigger signal is ignored during the set time interval (T); the
start trigger signal caused first after elapse of the set time (T) becomes a trigger
point.