Agilent Technologies N8201A User Manual download pdf (Page 6)

If you are interested in phase noise versus

time at a single offset frequency, use the

spot frequency phase noise measurement.

• Monitor phase noise fluctuation

versus time at a user-specified

single offset frequency (between

100 Hz and 100 MHz).

• Use the N8201A’s phase noise

optimization feature to minimize the

downconverter’s internal phase noise.

• Check carrier frequency drifting

with carrier signal tracking.

• Search carrier frequency

automatically.

• View results in graphic and

numeric list formats.

Spot frequency phase noise

Instructions Keystrokes

Activate the spot frequency measurement. [MEASURE] {Spot Frequency}

Specify the spot frequency to 20 kHz. [Meas Setup] {Spot Offset} {20 kHz} and Enter

on the keyboard

Adjust amplitude scale to optimize the display. [Amplitude] {Phase Noise} {Ref Value}

Observe the real-time phase noise display {–110 dBc/Hz} and Enter on the keyboard

at 20 kHz offset frequency (Figure 5). {Scale/Div} {0.5 dB} and Enter from the

keyboard, then rotate the knob for fine

adjustment with either {Ref Value}

or {Scale/Div} pressed

View spot frequency phase noise with a table of [Trace/View] {Numerical}

numerical readouts.

Return to graphical view. {Graphical}

Turn on signal tracking to check carrier frequency [Frequency], toggle {Signal Track} to “On”

drift. Check the carrier frequency drifting at a {Tracking} {Mode} {Interval} {Interval}

fixed time interval, for example at each 10 percent {10} and Enter on the keyboard

of one sweeping cycle.

Adjust amplitude scale of frequency drifting [Amplitude] {Delta Freq}, {Scale/Div}, then

(or Delta Frequency). rotate the knob to an optimized display

Observe the spot frequency phase noise with

carrier drifting plot (Figure 6).

Check the frequency stability of the carrier signal [Frequency], toggle {Signal Track} to “On”,

when the carrier drifting goes beyond the {Tracking} {Mode} {Tolerance} {Tolerance ±}

specified tolerance. This example uses a {1 dBc/Hz} and Enter on the keyboard

±1 dBc/Hz tolerance level.

Set amplitude scale of frequency drifting (or [Amplitude] {Delta Freq} {Scale/Div} {1 kHz}

delta frequency) to 1 kHz/Div. and Enter on the keyboard

Check frequency drifting at the “Delta Freq” Set ESG: [Frequency], then rotate the knob

panel while manually adjusting the ESG RF clock- or counterclock-wise around the

output frequency by ±2 kHz increments. previously specified center frequency

In this exercise, you will measure the

spot frequency at 20 kHz and explore

the signal tracking and the carrier

frequency drifting features.

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Agilent Technologies N8201A User Manual Page 6

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