Exfo IQS-12002B Calibration System Uživatelský manuál stáhnout pdf (Strana 69)

Calibration Methods

Calibration System 65

Power Meter

8. At the end, the global nonlinearity is the sum of all the local

nonlinearities expressed in decibels (dB), starting calculations from

the reference power level where the nonlinearity is zero (higher order

terms are negligible).

The equations to use are as follows:

For n < 0

For n = 0

For n > 0

where:

n < 0 indicates power levels lower than the reference power.

n > 0 indicates power levels higher than the reference power.

is the local nonlinearity for the step (i = 0 for the step where P

the reference power).

The result is a list of global nonlinearities for the whole power range in

steps of 3,01 dB.

The largest nonlinearity relative to the reference power is:

This procedure can be performed with decreasing and/or increasing the

power sent to the DUT.

∑

−=

inglobal

)(

NLPNL

0)(

0global

PNL

∑

NLPNL

inglobal

)(

max

max NLglobal()dB()±=

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 107 108

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Exfo IQS-12002B Calibration System Uživatelský manuál Strana 69