Agilent Technologies N1911A User Manual download pdf (Page 8)

Characteristic Peak Flatness

The peak flatness is the flatness of a peak-to-average ratio measurement for various tone separations for an equal magni-

tude two-tone RF input. Figure 2 refers to the relative error in peak-to-average ratio measurements as the tone separation

is varied. The measurements were performed at –10dBm with power sensors with 1.5m cable lengths.

-3.5

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5

0 5 10 15 20 25 30

Input tone separation frequency (MHz)

Error (dB)

High

Medium

Low

(< 500 MHz)

Off

(> 500 MHz)

Figure 2. N192XA Error in peak-to-average measurements for a two-tone input (High, Medium, Low and Off filters)

Noise and drift

Sensor model Zeroing Zero set Zero drift

Noise per

sample

Measurement noise

(Free run)

<500MHz >500MHz

N1921A /N1922A No RF on input 200 nW

100 nW 2 μW 50 nW

RF present

550 nW

200 nW

Measurement average setting 1 2 4 8 16 32 64 128 256 512 1024

Free run noise multiplier

1 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.3 0.25 0.2

Video BW setting Low 5 MHz Medium 15 MHz High 30 MHz Off

Noise per sample multiplier < 500 MHz

≥ 500 MHz

0.5

0.45

0.75

1.1

1. Within 1 hour after a zero, at a constant temperature, after 24 hours warm-up of the power meter. This component can be disregarded with

Auto-zero mode set to ON.

2. Measured over a one-minute interval, at a constant temperature, two standard deviations, with averaging set to 1.

Effect of video bandwidth setting

The noise per sample is reduced by applying the meter video bandwidth filter setting (High, Medium or Low). If averaging

is implemented, this will dominate any effect of changing the video bandwidth.

Effect of time-gating on measurement noise

The measurement noise on a time-gated measurement will depend on the time gate length. 100 averages are car-

ried out every 1 μs of gate length. The Noise-per-Sample contribution in this mode can approximately be reduced by

√(gate length/10 ns) to a limit of 50 nW.

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

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Agilent Technologies N1911A User Manual Page 8

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