Agilent Technologies N1911A Bedienungsanleitung PDF herunterladen (Seite 8)

Characteristic Peak Flatness

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

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

<500 MHz > 500 MHz (Free run)

N1921A /N1922A No RF on input 200 nW

100 nW 2 µW 50 nW

RF present 550 nW 200 nW

Measurement average setting 12481632641282565121024

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 0.5 1 2 1

≥ 500 MHz 0.45 0.75 1.1 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 carried out

every 1 us 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.

12. Within 1 hour after a zero, at a constant temperature, after 24 hour

warm-up of the power meter. This component can be disregarded with

Auto-zero mode set to ON.

13. Measured over a one-minute interval, at a constant temperature, two

standard deviations, with averaging set to 1.

-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

)

Off

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

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