HP 54600A User's And Service Manual page 48

Figure 23
OdB
3 dB down point
Figure 24
Operating Your Oscilloscope
To reduce tile raado• 1o1se 01 a slgaal
Low frequency reject (LF reject) adds a high pass filter with the 3 dB
point at 50 kHz (see figure 23). Use LF reject to remove low frequency
signals such as power line noise from the trigger path.
de
LF reject
50 kHz
Pass
Band
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.
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