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a) Set the signal generator to output the broadband FM signal:
Use the signal generator to generate one FM signal. Set the frequency as 1GHz, power as -10dBm, FM offset as
500kHz and demodulation rate as 10kHz. Connect the output of the signal generator to the RF input end of the
spectrum analyzer through one cable, as shown in Fig. 4-1. Enable the ON state of the modulation output and radio
frequency.
b) Reset the spectrum analyzer into the default state:
Press [Reset].
c) Set the reference level of the spectrum analyzer:
Press [Amplitude] , [Ref Level] and -10[dBm];
Press [Amplitude] and [Scale/Div] and set the scale as 10dB/division.
d) Set the resolution bandwidth and video bandwidth:
Press [BW] and [RBW Auto Man], and set the resolution bandwidth as 30kHz;
Press [BW] and [VBW Auto Man
], and set the video bandwidth as 30kHz or less.
e) Enable the ACPR measurement:
Press [Measure], [ACPR] and [ACPR Off On
] to enable the ACPR interface.
f) Set the center frequency of the main channel:
Press [Center Freq] and set the center frequency of the main channel with number keys, i.e. 1GHz.
g) Set the bandwidth of the main channel:
Press [Main Ch BW] and set the bandwidth of the main channel with number keys, i.e. 1MHz.
h) Set the adjacent channel bandwidth:
Press [Adj Ch BW] and set the adjacent channel bandwidth with number keys, i.e. 2MHz.
i) Set the channel spacing:
Press [Ch Spacing] and set the channel spacing as 1MHz with number keys.
j) Enable the ACPR test:
Press [ACPR Off On
]. Then the measurement results will be displayed at the bottom of the screen. Refer to Fig. 4-4
for the schematic diagram of ACPR measurement.