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2232
User Manual
3-27
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-
!
Displaying Signals
Triggering on Low-Frequency Signals
Use the
NORM
trigger mode for signals that are lower than 20 Hz in
NON-
STORE
or 500 Hz in
STORE.
If the repetitive signal is lower than these
frequencies, the
P-P AUTO
circuit interferes with obtaining a stable trigger.
This is because the
P-P AUTO
circuit will start to generate its own signal to
trigger a sweep or acquisition.
(Note:
NORM
trigger mode is not the same as
A COUPL NORM.)
Step 1:
Apply the repetitive signal to the Channel
1
input connector.
C]
Step
2:
Set trigger mode to
NORM
and the horizontal mode to A.
Step 3:
Set the vertical mode to Channel
1
and the
A
&
B
(trigger)
SOURCE
to
VERT MODE.
(The trigger signal is obtained from the signal
applied to the selected channel; in this case, Channel
1
.)
C]
Step
4:
Set the
A COUPL
switch to
NORM.
Step 5:
Adjust the
A TRIGGER LEVEL
and
VAR HOLDOFF,
if neces-
sary, to stabilize the display.
Step
6:
Adjust the vertical and horizontal controls to display a few
cycles of the waveform.
C]
Step
7:
Set the oscilloscope to
STORE
mode (Figure 3-25). Note that
the annoying flicker of the
NON-STORE
display is removed.
Figure 3-25: Low-Frequency Signal in the STORE Mode
Triggering on Random or Infrequent Events
Sometimes the event that you want to display occurs very infrequently. The
oscilloscope can be set up to capture these events. Refer to Capturing
Random Events, page 3-1 2.
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