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trace and reduce apparent noise. The measurement
requires a continuously repeating signal. Increasing
the value of the filter reduces noise but increases the
time required to make the measurement.
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Select a value close to or greater than that of the
modulating signal bandwidth. Note that this varies
between sensors (See Table 8 on page 90). The pass
band shapes achieved by the video bandwidth settings
are flat with very sharp cutoffs to ensure accurate
power measurement within the specified band.
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A fourth, filter Off, setting is provided. This provides
approximately 3dB roll off at the maximum sensor
bandwidth and is best suited for accurate trace
capture, removing any ringing effects caused by the
sharp cut-off filters used in the Low, Med and High
settings. Figure 39 shows the filter shapes associated
3.5 dB
300kHz 1.5MHz
5MHz
0
Frequency
Amplitude
E9323A and E9327A sensors
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High
Med
Low
Off
Meter B/W
Setting
E4416-90023.book Page 100 Thursday, August 9, 2001 9:17 AM