Agilent Technologies 8935 Series Specifikace stáhnout pdf (Strana 188)

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Chapter 8 187

Performance Tests

RF Generator Residual FM Performance Test 4

RF Generator Residual FM

Performance Test 4

The purpose of this test is to verify that the Test Set meets the

specification limits in PTR (Performance Test Record) Table 9-4, “RF

Generator Residual FM Test 4 Record,” on page 240. The residual FM

of the RF generator is measured directly by the measuring receiver. An

external LO is used to improve the residual FM of the measuring

receiver. An audio analyzer with a CCITT psophometric filter is

required to measure the demodulated FM.

NOTE

Two setups are shown below and on the following page. The first setup

is capable of measuring signals to 1 GHz. The second setup has a

microwave converter which covers the full measurement range of FM

signals to 2 GHz. The microwave converter’s LO must be a low residual

FM synthesizer.

Initial Setup

Figure 8-7 Setup for Measurements to 1 GHz

DUPLEX OUT

Signal Generator

Measuring Receiver

Audio Analyzer

INPUT

MODULATION OUTPUT

EXT LO

INPUT

RF OUTPUT

INPUT 50Ω

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