To Select Trigger Coupling; To Select Noise Reject And Hf Reject - Agilent Technologies 54622A User Manual

Triggering the Oscilloscope

To select trigger Coupling

To select trigger Coupling
1 Press the Mode/Coupling
2 Press the
Coupling
• DC coupling allows dc and ac signals into the trigger path.
• AC coupling places a 3.5 Hz high-pass filter in the trigger path removing any
DC offset voltage from the trigger waveform. Use AC coupling to get a stable
edge trigger when your waveform has a large DC offset.
• LF (low frequency) Reject coupling places a 50-kHz high-pass filter in series
with the trigger waveform. Low frequency reject removes any unwanted low
frequency components from a trigger waveform, such as power line
frequencies, that can interfere with proper triggering. Use this coupling to
get a stable edge trigger when your waveform has low frequency noise.
• TV coupling is normally grayed-out, but is automatically selected when TV
trigger is enabled in the Trigger More menu.

To select Noise Reject and HF Reject

1 Press the Mode/Coupling
2 Press the
Noise Rej
softkey to select high frequency reject.
• Noise Rej adds additional hysteresis to the trigger circuitry. When noise reject
is on, the trigger circuitry is less sensitive to noise but may require a greater
amplitude waveform to trigger the oscilloscope.
• HF Reject adds a 50 kHz low-pass filter in the trigger path to remove high
frequency components from the trigger waveform. You can use HF Reject to
remove high-frequency noise, such as AM or FM broadcast stations, from the
trigger path.
3- 6
key.
softkey, then select
DC, AC,
key.
softkey to select noise reject or press the
or coupling.
LF Reject
HF Reject