YOKOGAWA AQ2160-02, Руководство пользователя, Страница: 44 / 73

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3-6 High Power Measurement
The amount of attenuation in the fixed optical attenuator used is
stored as the user calibration value (CAL), and you can perform “high
power measurement” of power that exceeds the upper limit of the
measurement power range. When performing high power
measurement, do not input light that exceeds the measurement
maximum value in the following equation.
Measurement max. value = upper limit of power range + amount of
attenuation in the fixed optical attenuator
+X’ dBm = +10 dBm + X dB
The CAL value can be set in the following two ways.
1) Enter the amount of attenuation in the fixed optical attenuator
directly (section 3-6-1).
2) Enter the amount of attenuation as measured by relative value
measurement (section 3-6-2).
The setting procedures described all start from the Initial state
(absolute value measurement in normal measurement mode).
<Display Example> Initial state
Same screen as when first starting up.
Confirm that the screen shows the
Initial state before beginning the
procedure.
For effective use with the instrument, it is recommended to use a
fixed optical attenuator with 20 dB of attenuation, and a
maximum allowable optical input level of 1 W or more.
With such devices, do not input light that e30 dB.
Do not look inside the optical connector nor peer into the optical
device. Doing so can result in injury to the eyes from lasers.
Take necessary precautions.
Clear this function before measuring optical levels of +10 dB or
lower.
PWR SAVE
nm
CW
dBm
PWR SAVE PWR SAVE
nm
CW
dBm