8.6 Vindov Triggering
Window triggering allows the user to capture signals exceeding the
positive or negative limits set around the base line (in internal
trigger) or ground (in external trigger) with the TRIGGER LEVEL control
(33).
Using the same basic acquisition parameters and signal used in Section
8.5, it is possible to halt the rolling signal by increasing its
amplitude until it crosses the positive or negative "window" which
defines the trigger conditions.
Procedure:
I)
Set the TRIGGER SLOPE push button (25) to POS/NEG. (Both the
and NBG LEDs will light up when push button (25) has been pressed
the correct number of times).
2) Set the COUPLING MODE push button (30) to the AUTO Trigger Mode.
3)
Adjust the CHAN 2 OFFSET control (32) in order to center the sine
wave display at mid-screen.
4)
Select a trigger "window" just beyond the positive or negative half
cycle of the currently displayed sine wave by adjusting the TRIGGER
LEVEL control (33) to approximately ± 3.0 divisions.
Note that when Window Triggering has been selected via push button
(25), a corresponding message is displayed below the bottom graticule
line on the right-hand portion of the screen in the abridged Panel
Status field. This field enables you to adjust the positive/negative
trigger window desired without having to call the Panel Status menu.
5)
Gradually increase the amplitude of the output signal from your
signal generator until the positive and negative half-cycle of the
displayed sine wave exceeds 3.0 divisions with reference to the
zero base line.
Resulting Display:
Rolling will cease when the rolling waveform reaches ± 3 divisions in
amplitude.
8.7
Storing and Recalling Front Panel Setups
Storing repetitive signals.
i)
Follow the same procedure as in Section 8.1 applying the probe
calibrator signal.
2)
Press the STORE PANEL (4) push button.
8-9
Basic 9400A Waveform Measurements
and Operating Procedures
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