Specifications

102 Chapter 12
Using Segmented Sweep (ESA-E Series Spectrum Analyzers)
Measuring Harmonics Using Standard Sweep
Using Segmented Sweep (ESA-E
Series Spectrum Analyzers)
Measuring Harmonics Using Standard Sweep
This procedure measures the fundamental 50 MHz signal plus the
second and third harmonics. Compare the measurement times with this
procedure, sweeping from 20 MHz to 170 MHz versus the next
procedure “Measuring Harmonics Using Segmented Sweep” on page
104.
Step 1. Preset the instrument:
Press
Preset, Factory Preset (if present).
Step 2. Use the analyzer internal 50 MHz amplitude reference signal:
For ESA model numbers E4401B and E4411B, use the internal 50 MHz
amplitude reference signal.
Press
Input/Output, Amptd Ref (On).
For all other ESA model numbers connect a cable between the
front-panel AMPTD REF OUT to the analyzer INPUT.
Press
Input/Output, Amptd Ref Out (On).
Step 3. Set the frequency span to view the fundamental signal, second
harmonic and third harmonic:
Press
FREQUENCY Channel, Start Freq, 20, MHz, Stop Freq, 170, MHz.
Press
AMPLITUDE Y Scale, Ref Level, −20, dBm.
Step 4. Set the resolution bandwidth and video bandwidth:
Press
BW/Avg, Res BW, 1, kHz.
Press
BW/Avg, Video BW, 1, kHz.
Step 5. Place a marker at the 50 MHz signal (you may need to wait for a
minute until the analyzer sweeps past 50 MHz):
Press
Peak Search.
Refer to Figure 12-1 to see the result of this first measurement in this
example. Notice the minimum sweep time is set at 193.3 seconds in
order to provide accurate data. If you attempt to enter a faster sweep
time, the Meas Uncal message is shown in the upper right corner of the
display.