HP 70427A User Manual page 546

Performance Tests
Test 5 - Mixer Linearity (IF)
Test 5 - Mixer Linearity (IF)
Overview
This functional test measures the downconverter's mixer linearity at an input
level of –5 dBm. It does this by measuring an amplitude modulated signal at
the IF output at two carrier levels. Percent AM is measured at each level with
a measuring receiver. Mixer linearity is read from a table by looking up the
difference between the two AM percentage readings.
This test is based on a mixer compression measurement technique described
in Hewlett-Packard Application Note 286-2.
Test Limit
Mixer linearity: ............................................ ±0.4 dB, mixer input ≤ –5 dBm
Equipment
HP 8902A Measuring Receiver
HP 83640A Sweep Oscillator (μW Sig Gen)
HP 8116A Pulse/Function Generator Test Setup
Test Setup
Figure 14-8 Measuring Receiver Set Up
HP 70427A/HP 70428A User's Guide 14-35