276 Keysight NFA Series Noise Figure Analyzers Service Guide
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
process.
— If the analyzer is an N8973B, press FREQ, 600 MHz, Zero Span.
If the analyzer is an N8974B, 75B, or 76B, press FREQ, 4.2 GHz, Zero Span.
—Refer to Figure 8-1, disconnect A14W4 cable at A14J740.
— Connect A14J740 1st LO output to the RF input of the functioning spectrum
analyzer using a cable that will function up to 10 GHz.
—Press Frequency, 4.5225 GHz (if the analyzer is NOT an N8973B) or
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.
— The analyzer marker should read 4.5225 GHz or 5.7225 GHz at +16.55 dBm
± 3dB as shown in Figure 8-5.
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