Section 6 Performance test system
6-8
On MN74A, connect CH1 to MG3633A OUTPUT, connect CH3 to 6769B RF OUTPUT, and connect CH5 to MS2602A RF
Input. Connect MG443B UNBALANCED to 11715A AUDIO IN. On MA1612A, connect SSG3 terminal to MG3633A
OUTPUT and terminate SSG2 terminal with 50 ohms terminator.
At the measurement, connect the spectrum analyzer’s RF Input to COMMON of MN74A.
(1) Measuring 2nd harmonic distortion, insert two lowpass filters between the RF Input and the COMMON.
(2) Measuring two signal 3rd intermodulation distortion and 1 dB gain compression, connect the RF Input to
MA1612A’s Receiver terminal and connect the COMMON of MN74A to SSG1 terminal.
(3) Measuring FM demodulation frequency response, connect the RF Input to the COMMON of MN74A, and connect
11715A’s FM OUT or FM/4 OUT to CH7 of MN74A according to PC instruction.
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