Agilent Technologies N8201A User Manual download pdf (Page 8)

Displayed average noise level

(DANL) measurements

The DANL floor of a spectrum analyzer sets

limitations for measuring the smallest in

put signal, usually at the far-out offset

frequencies. When the amplitude of a

signal under test is getting closer to the

DANL floor, a significant measurement

error can occur, which makes the

measurement no longer valid. To help

you ensure the measurement is valid,

the N8201A with the phase noise

measurement personality measures

the DANL floor and displays it along with

the phase noise plot. It also automatically

optimizes the N8201A input attenuation

level for the far-out offset frequency

to lower the DANL floor for a better

measurement sensitivity.

• Measure and reference the DANL

of the N8201A to the carrier amplitude.

• Display the DANL floor together

with the log plot phase noise.

• Store and record traces easily.

Figure 7.

DANL floor displayed

with a smoothed

phase noise plot

Instructions Keystrokes

Re-enter phase noise measurement mode [Preset] [Mode] {Phase Noise}

in the N8201A.

Set center frequency to 1 GHz. [FREQUENCY] {1 GHz} and Enter on the keyboard

Activate log plot measurement. [MEASURE] {Log Plot}

Adjust the X-scale. [SPAN] {Start Offset} {1 kHz} and Enter on

the keyboard {Stop Offset} {100 MHz} and

Enter on the keyboard

Adjust the Y-scale. [AMPLITUDE] {Ref Value} {–85 dBc/Hz} and

Enter on the keyboard

View the smoothed phase noise plot without [Trace/View], toggle {Trace} to underline “1”,

raw data. {Blank}

Transfer the smoothed phase noise curve from Toggle {Trace} to underline “2”, {More 1 of 2}

“Trace 2” to “Trace 3”. {Operations} {2 → 1}.

Activate the DANL measurement. [Meas Setup] {Meas Type} {DANL Floor}

Note the stepped DANL floor that results from [Restart]

the DANL optimization (Figure 7, lower trace).

The following exercise demonstrates

the DANL measurements, display, and

optimization.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Agilent Technologies N8201A User Manual Page 8

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