Agilent Technologies 54657A Specifications Page 61

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Low frequency reject (LF Reject) adds a high pass filter with the 3-dB point at
50 kHz (see figure 2-20). Use LF reject to remove low frequency signals such
as power line noise from the trigger path.
LF reject (trigger path)
Noise reject increases the trigger hysteresis band. By increasing the trigger
hysteresis band you reduce the possibility of triggering on noise. However,
this also decreases the trigger sensitivity so that a slightly larger signal is
required to trigger the oscilloscope.
Random noise on the displayed waveform
3 dB down point
Pass
Band
dc
0 dB
50 kHz
Figure 2-20
Figure 2-21
Operating Your Oscilloscope
To reduce the random noise on a signal
2–31
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