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59
Measurement Example of a Bandpass Filter
This section describes how to measure the transmission characteristics of a
947.5 MHz bandpass filter. The measurement conditions for this
measurement example are those suitable for a 947.5 MHz bandpass filter.
To measure another device under test (DUT), change the measurement
conditions to suit the particular DUT.
STEP 1. Determining Measurement Conditions
1. Preset the E5071C.
Preset > OK
2. Set the S-parameter to S21.
Meas > S21
3. When measuring the reverse transmission characteristics, set
the S-parameter to S12.
3. Set the data format to the log magnitude format
Format > Log Mag
4. Set the center frequency to the bandpass filter center frequency.
Next, specify the span frequency, which is set to 200 MHz in this
measurement example.
Center > 9 > 4 > 7 >. 5 > M/m
Span > 2 > 0 > 0 > M/m
3. When entering the frequency unit using the keyboard, type "G"
for GHz, "M" for MHz, and "k" for kHz.
5. Specify the number of measurement points per sweep. The number
of measurement points in this measurement example is set to 401.
Sweep Setup > Points > 4 > 0 > 1 > x1
6. Specify the power level of the signal source. The power level in this
measurement example is set to -10 dBm.
Sweep Setup > Power > +/- > 1 > 0 > x1
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