Am Dynamic Range - Agilent Technologies 83620A Service Manual

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18. AM Dynamic Range

Description and Procedure
In this procedure, a function generator is used to provide a DC voltage to the
synthesizer's AM input. he synthesizer is set to 0 dBm output power. AM is
enabled and a DC voltage is applied. he DC voltage is set for maximum AM
without an overmodulation indication to drive the synthesizer's modulator to
the edge of distortion. he output power is measured with a power meter.
A measurement is made in 1 GHz steps across the synthesizer's frequency
range. his equipment lets you measure down to
level before the synthesizer overmodulates, the power meter will indicate an
under range measurement.
his procedure is repeated using the deep AM function in the search ALC
mode. A spectrum analyzer is used in place of the power meter to make
the deep AM measurement. his equipment allows you to measure down to
0
approximately 65 dBm. If your synthesizer does not overmodulate by this
point, and you wish to measure the power level just before overmodulation, use
a power supply to increase the DC voltage supply to the AM input.
Do not exceed
CAUTION
occur.
1. Preset the instruments shown in Figure 2-27 and let them warm up for at
least one hour.
HP 8360
0
30 dBm. If you reach this
0
15 V DC to the AM input or damage will
Performance Tests
AM Dynamic Range
2-107