8163A/B, 8164A/B, 8166A/B User’s Guide 221
Setting Attenuation and/or Power Levels 8
To apply an attenuation factor:
1 Use the Cursor key to highlight the λ parameter, then press [Edit]
2 Use the Cursor key to enter the appropriate wavelength, in nm.
3Press [OK].
4 Use the Cursor key to highlight the
α parameter, then press [Edit].
5 Use the Cursor key to enter the required attenuation factor, in dB.
6Press [OK].
Filter Transition Speed
By default, the Attenuator’s filter transitions to a new
α setting as quickly
as possible. If your test setup requires a slower filter transition speed,
press [Menu], then select the <Speed> option. Select a speed between 0.1
and 12 dB/s, then press [OK].
While the Attenuator module is transitioning to a new setting, its status is
shown as ‘B’ (or ‘Busy’).
How to Apply an Attenuation Offset
Attenuating an input signal to a DUT introduces additional connectors and
other components into your optical test setup. An attenuation offset is
typically applied to calibrate for the intrinsic insertion loss of these
components. First you measure this insertion loss using a reference
powermeter, then you compensate by entering the result into the
Attenuator module’s
α
Offset
parameter.
81570A/71A/73A/78A modules
1 Set the reference powermeter’s
λ parameter to the appropriate
wavelength, its <Power Unit> to dB, and to an appropriate
measurement <Averaging Time>.
2 Use a patchcord to connect the source output to the reference
powermeter.
3 Press the powermeter’s [Disp -> Ref] softkey. Power is now measured
relative to this reference value, so the powermeter displays 0.000 dB
Using very slow speeds may block this attenuator channel for several
minutes.
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