303
Set the trigger coupling
7
Push the up and down arrow buttons to set COUPLING:
• DC passes both AC and DC components of the input
signal.
• AC passes only the AC components of an input signal.
• HF REJ attenuates signals above 30 kHz.
• LF REJ attenuates signals below 80 kHz.
• NOISE REJECT provides lower sensitivity, reducing the
chance of falsely triggering on noise.
Select the trigger mode
8
Push the MODE button to toggle between NORM and AUTO
trigger modes:
• NORM requires a valid trigger event to acquire a waveform.
• AUTO acquires a waveform even if no valid trigger event
occurs.
Be aware that in AUTO mode, the acquired waveforms may not
be triggered.
Checking Trigger Status
To see the state and setup of the triggering circuit, use the trigger status lights, readout, and screen.
Trigger status from trigger
status lights
1
To quickly determine the trigger status, check the ARM,
READY, and TRIG'D controls.
 If TRIG'D is on, the oscilloscope has recognized a valid
trigger and is filling the posttrigger portion of the
waveform.
 If READY is on, the oscilloscope can accept, and is waiting
for, a valid trigger.
 If ARM is on, the trigger circuitry is filling the pretrigger
portion of the waveform record.
 If both TRIG'D and READY are on, a valid A event trigger
has been recognized and the instrument is waiting for a
delayed trigger. When a delayed trigger is recognized, the
posttrigger portion of the delayed waveform will fill.
 If ARM, TRIG'D, and READY are off, the acquisitions
have stopped.
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