Controls, Connectors, and Indicators
SOURCE
Buttons and
indicators
VERT
Select the trigger-signal source for either A Sweep or
B Sweep.
The sweep triggers on the displayed channel when
only one channel is selected. If multiple vertical
displays are selected, both the trigger Mode and the
Chop/Alt selection affect the triggering source. With
Alt vertical mode and with A-Trigger modes other
than Auto Lvl, each displayed channel in turn
provides the triggering signal and the respective LED
indicator for each displayed channel is illuminated.
With Auto Lvl trigger mode or with Chop vertical
mode,
the lowest-numbered channel, or ADD if it is
displayed,
is the triggering-signal source. The Source
indicators show the source of the triggering signal in
any case. When ADD is selected, both the CH 1 and
the CH 2 indicators are illuminated.
CH 1, CH 2,
CH 3, or
CH4
LINE (A-
Trigger
Only)
A triggering signal is obtained from the
corresponding vertical channel.
A triggering signal is obtained from a sample of the
ac power-source waveform. This trigger source is
useful when vertical input signals are related (multiple
or submultiple) to the frequency of the ac power-
source voltage.
COUPLING
Buttons and
Indicators
DC
Select the method of coupling the triggering signal to the
trigger generator.
All frequency components of the signal are coupled
to the trigger. This coupling is preferred for most
signals.
NOISE REJ All frequency components of the input signal are
coupled to the trigger. This coupling improves trigger
stability with signals accompanied by low-level noise.
HF REJ Attenuates high-frequency triggering-signal
components above 50 kHz. This coupling eliminates
radio-frequency interference and high-frequency
noise components from the signal applied to the
trigger. It allows triggering on the low-frequency
components of a complex waveform. No trigger level
readout is displayed.
5-22
2465B/2455B/2445B Operators
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