Verifying The 1St L.o. Output Power - Keysight N8973B Service Manual

L.O. Synthesizer/Reference Troubleshooting
A14 L.O. Synthesizer Troubleshooting

Verifying the 1st L.O. Output Power:

— Turn on the analyzer and wait for the instrument to complete the boot up
— If the analyzer is an N8973B, press FREQ, 600 MHz, Zero Span.
— Refer to
— Connect A14J740 1st LO output to the RF input of the functioning spectrum
— Press Frequency, 4.5225 GHz (if the analyzer is NOT an N8973B) or
— The analyzer marker should read 4.5225 GHz or 5.7225 GHz at +16.55 dBm
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process.
If the analyzer is an N8974B, 75B, or 76B, press FREQ, 4.2 GHz, Zero Span.
Figure 8-1, disconnect A14W4 cable at A14J740.
analyzer using a cable that will function up to 10 GHz.
Frequency 5.7225 GHz (if the analyzer is an N8973B), Span, 5 MHz, Peak
Search on the functioning spectrum analyzer. If the functioning spectrum
analyzer has a preselector peak or preselector centering function, perform
that operation to guarantee the preselector is optimized for the
measurement.
± 3 dB as shown in Figure 8-5.
Keysight NFA Series Noise Figure Analyzers Service Guide