Product Description
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TDS 420A, TDS 430A & TDS 460A Service Manual
Both the delayed only display and the intensified zone on the main intensified
display can be delayed by time with respect to the main trigger. You can set both
to display immediately after the delay (delayed runs after main mode); you can
set the delayed display to display at the first valid trigger after the delay (delayed
triggerable mode).
The delayed display (or the intensified zone) can also be delayed by a selected
number of events. In such a case, the events source is the delayed trigger source.
For any events signal, the delayed-trigger system conditions the signal by
determining the source, coupling, and other things, of that signal.
At time base settings of 20 ms per division or slower the records are displayable
using Roll mode. Both untriggered roll and triggered roll modes are available.
Trigger System
The triggering system comprises a complete set of features for triggering the
signal-acquisition system. In edge trigger mode, you can select the source, slope,
coupling, mode (auto or normal), and holdoff.
Oscilloscopes ordered with Option 5 also have the video trigger mode. This
trigger mode allows triggering on NTSC-standard, PAL-standard, SECAM-stan-
dard, and custom video waveforms. You can configure the triggering for
interlaced or non-interlaced scanning, different scan rates, field selection, line
selection, and for delay by line or time.
You can choose where the trigger point is located within the acquired waveform
record by selecting the amount of pretrigger data displayed. You can select
presets of 10%, 50%, and 90% of pretrigger data in the horizontal menu, or you
can assign the General Purpose knob to set pretrigger data to any value within
the limits of trigger position resolution.
Acquisition Control
Depending on your measurement requirements, you can specify the mode and
manner in which signals are acquired and processed:
H You can select equivalent-time sampling on repetitive signals or interpola-
tion of points sampled on non-repetitive signals. Both can increase the
apparent sample rate on the waveform when maximum real-time rates are
reached.
H You can use peak-detect, high-resolution, sample, envelope, and average
modes to acquire signals.
H You can set the acquisition to stop after a single acquisition (or sequence of
acquisitions if acquiring in average or envelope modes).
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