PeakTech 2035 Bedienungsanleitung Seite 45

Triggerpoint selection
The SLOPE switch determines whether the sweep will on a positive-going or negative-going transition of
the trigger signal (See fig. 2-4). Always select the steepest and most stable slope or edge. For example,
small changes in the amplitude of the sawtooth shown in Figure 2-4 a will cause jittering if the timebase is
triggered on the positive (ramp) slope, but have no effect if triggering occurs on the negative slope (a fast-
fall edge).
In the example shown in Figure 2-4b, both leading and trailing edges are very steep trace to jitter, making
observation difficult. Triggering from the stable leading edge (+ slope) yields a trace that has only the
trailing -edge jitter of the original signal. If you are ever in doubt, or have an unsatisfactory display, try
both slopes to find the best way.
Trigger Level Control
The LEVEL control determines the point on the selected slope at which the main (A) timebase will be
triggered. The effect of the LEVEL control on the displayed trace is shown in figure 2-4 c. The "-","0", and
"+" panel-markings for this control refer to the waveform's zero crossing and points more positive (+) and
more negative (-) than this. If the trigger slope is very steep, as with square waves or digital pulses, there
will be no apparent change in the displayed trace until the LEVEL control is rotated past the most positive
or most negative trigger point, whereupon the display will free run (AUTO Sweep mode) or disappear
completely (NORM sweep mode). Try to trigger at the mid point of slow-rise waveforms (such as sine and
triangular waveforms), since these are usually the cleanest spots on such waveforms.
Fig. 2-4: Trigger-Slope Selection
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