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144 Chapter 4
Making Measurements
50 MHz Amplitude
50 MHz Amplitude
Purpose
To check the amplitude of the internal 50 MHz amplitude reference
signal.
Measurement Method
The amplitude of an internal 50 MHz reference signal is compared with
the amplitude of a stable external 50 MHz signal which has been
measured with a power meter and then connected to the front panel RF
connector.
Test Setup
The 50 MHz amplitude feature enables you to measure the amplitude of
the internal 50 MHz reference signal. The amplitude of an internal 50
MHz reference signal is adjusted as close as possible to
−25.00 dBm,
based on the relative measurement of the reliable external 50 MHz
signal, which is input by the user into the front panel RF connector.
Follow these steps to measure the amplitude of the 50 MHz amplitude
reference signal (a power meter and a reliable external source will be
needed to perform this test):
1. Set the external source to a frequency of 50 MHz at a power level of
−25 dBm (± 2 dBm).
2. Connect the external source to the power meter through a cable.
Adjust the power output of the source until the power meter reads
−25.00 dBm, or as close to −25.00 dBm, as possible.
3. Disconnect the power sensor and connect the source to the
transmitter tester.
4. Press
Mode, Service, Measure, 50 MHz Amptd on the transmitter tester.
See next page for results.