Agilent Technologies 54503A User's Guide Page 78

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78 Chapter2
Making Measurements
Example 5: Third-Order Intermodulation Distortion
b. Set the reference level to this value by pressing MKR ,
MARKER REF LVL. Figure 2-23 on page 78 illustrates the
resulting display.
Figure 2-23 Signal Peak Set to Reference Level
Maximize dynamic range
12.Distortion-free dynamic range is important for this type of
measurement. To maximize such dynamic range:
a. Set the mixer input level to 30 dBm by pressing
AMPLITUDE,
MORE 1 OF 3, MAX MXR LEVEL.
b. Enter 30 dBm.
The spectrum analyzer automatically sets the attenuation so the
maximum signal level is 30 dBm at the input mixer when the signal is
at or below the reference level (see Example 1). You will hear the input
attenuator click; notice that the value of the attenuator is now 20 dB
(see Figure 2-24 on page 79).
This change to the maximum mixer level can affect the noise, so you
may need to adjustment the resolution and video bandwidths.
Set a second marker and measure the distortion product
Once a marker is activated, the marker delta function activates a
second marker and displays the difference between the two markers.
Relative measurements can then be performed easily.
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