Agilent Technologies InfiniiVision 6000 Series, User Manual, Page: 133 / 368

Triggering the Oscilloscope 4
6000 Series Oscilloscope User’s Guide 133
To select trigger Coupling
1 Press the Mode/Coupling key.
2
Press the
Coupling
softkey, then select
DC, AC,
or
LF Reject
coupling.
• DC coupling allows DC and AC signals into the trigger
path.
• AC
coupling places a 10 Hz (3.5 Hz in 100 MHz bandwidth
models) high-pass filter in the trigger path removing any
DC offset voltage from the trigger waveform. The high-pass
filter in the External Trigger input path is 3.5 Hz for all
models. 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.
Note that Trigger Coupling is independent of Channel Coupling.
To change Channel Coupling see
page 85 .
To select trigger Noise Rejection and HF rejection
1
Press the
Mode/Coupling
key.
2
Press the
Noise Rej
softkey to select noise reject or press the
HF Reject 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.