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Chapter 2 77
Making Complex Measurements
Making Stimulus Response Measurements
Measurements are made continuously, updating at the end of each
sweep. This allows you to make adjustments and see changes as they
happen. The single sweep mode can also be used, providing time to
study or record the data.
The N dB bandwidth measurement error is typically ±1% of the span.
Example:
Measure the 3 dB bandwidth of a 200 MHz bandpass filter.
1. To measure the rejection of a bandpass filter, connect the equipment
as shown in Figure 2-5. This example uses a 200 MHz bandpass
filter.
Figure 2-5 Transmission Measurement Test Setup
2. Perform a factory preset by pressing
Preset, Factory Preset (if
present).
3. Set the Y-Axis Units to dBm by pressing
AMPLITUDE, More,
Y-Axis Units,
dBm.
4. Set the span to 100 MHz by pressing
SPAN, Span, 100, MHz.
5. Set the center frequency to 200 MHz by pressing
FREQUENCY,
Center Freq, 200, MHz.
6. Set the resolution bandwidth to 10 kHz by pressing
BW/Avg, Res BW,
10, kHz.
7. Turn on the tracking generator and if necessary, set the output
power to –10 dBm by pressing
Source, Amplitude (On), –10, dBm.
CAUTION Excessive signal input may damage the DUT. Do not exceed the
maximum power that the device under test can tolerate.