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SDS5000X Series Digital Oscilloscope User Manual
107 / 236 W W W. S I G L E N T. C O M
15.8 Trigger Coupling
The coupling setting of trigger is only valid when the trigger source is C1~C4,
EXT or EXT/5.
DC: All of the signal’s frequency components are coupled to the trigger
circuit for high frequency bursts or where the use of AC coupling would shift
the effective trigger level.
AC: The signal is capacitively coupled. DC levels are rejected. See the
datasheet for details of the cut-off frequency.
HFR: Signals are DC coupled to the trigger circuit and a low-pass filter
network attenuates high frequencies (used for triggering on low
frequencies). See the datasheet for details of the cut-off frequency.
LFR: The signal is coupled through a capacitive high-pass filter network,
DC is rejected and low frequencies are attenuated. For stable triggering on
medium to high frequency signals. See the datasheet for details of the cut-
off frequency.
15.9 Noise Reject
Noise Reject adds additional hysteresis to the trigger circuitry. By increasing
the trigger hysteresis, the noise immunity becomes better but the trigger
sensitivity degrades.
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