Noise Reject - Teledyne LeCroy T3DSO2000A Series User Manual

• 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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T3DSO2000A Manual. Page 69