Specifications

114 Chapter 13
Stimulus Response Measurements (ESA Options 1DN and 1DQ)
Calculating the N dB Bandwidth Using Stimulus Response
Stimulus Response Measurements
(ESA Options 1DN and 1DQ)
Calculating the N dB Bandwidth Using
Stimulus Response
This procedure uses the tracking generator for transmission stimulus
response measurements to calculate the 3 dB bandwidth of a 200 MHz
bandpass filter. See the concepts section “Measuring Device
Bandwidth” on page 160 for more information on this measurement.
Step 1. To measure the rejection of a bandpass filter, connect the equipment as
shown in Figure 13-3. This example uses a 200 MHz bandpass filter.
Figure 13-3 Transmission Measurement Test Setup
Step 2. Perform a factory preset:
Press
Preset, Factory Preset (if present).
Step 3. Set the center frequency, span and the resolution bandwidth:
Press
FREQUENCY Channel, Center Freq, 200, MHz.
Press
SPAN X Scale, Span, 100, MHz.
Press
BW/Avg, Res BW, 10, kHz.
Step 4. Turn on the tracking generator and set the output power to –10 dBm:
Press
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.
NOTE To reduce ripples caused by source return loss, use 10 dB (E4401B or
E4411B) or 8 dB (all other models) or greater tracking generator output
attenuation. Tracking generator output attenuation is normally a
function of the source power selected.