Functions and Measurements
Measuring Stop Band Attenuation of a Lowpass Filter
62
4 Set the resolution bandwidth to 10 kHz:
Press BW > 10 > KHz
5 Turn on the tracking generator and, if necessary, set the
output power to - 10 dBm
:
Press Mode > Tracking Generator > Amplitude (On) > -10 > dBm
6 Connect the test cable (but not the DUT) from the tracking
generator output to the analyzer input. Store the frequency
response into trace 3 and normalize:
Press Meas > Normalize > Store Ref (1
→ 4) > Normalize (On)
7 Reconnect the DUT to the analyzer. Note that the units of
the reference level have changed to dB, indicating that this
is now a relative measurement.
8 To change the normalized reference position:
Press Meas > Normalize > Norm Ref Posn > 8
9 Place the reference marker at the specified cutoff frequency:
Press Marker > Mode > Delta Pair (Ref) > 370 > MHz
10 Place the second marker at 37 MHz:
Press Delta Pair (Delta) > 37 > MHz
11 In this example, the attenuation over this frequency range is
- 17.98 dB/octave (one octave above the cutoff frequency).
CAUTION
Excessive signal input may damage the DUT. Do not exceed the
maximum power that the device under test can tolerate.
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