Operating and Maintenance Instructions – 22
3. When the required wavelength setting is reached, press ATT/PWR to store the setting and
return to the attenuation or power display.
A correction factor curve is adjusted for each attenuator to provide optimum performance with
a laser diode source at 1300 and 1550 nm. The user can increase or decrease the calibration
wavelength of the HA9 attenuator to find a better slope correction factor for the source in use.
The attenuator is optimized for low insertion loss at both 1300 and 1550 nm. Typically, the
variation in insertion loss from 1200 to 1700 nm is ≤0.2 dB.
Setting the User Slope
The slope of the attenuator can be matched to a power meter for a given source by optimizing
the calibration wavelength or by storing a user slope. Both procedures can be performed
locally or remotely.
Set the user slope before setting the display offset and the attenuation.
Optimizing the Calibration Wavelength
To optimize the calibration wavelength:
1. Press and hold the λ key for three seconds. The HA9 attenuator is reset, that is, the
attenuation is set to 0 dB, the operating mode is set to ATT, and the display offset is set to
0 dB.
2. Set the power meter to 0 dB.
3. Press the ▲ or ▼ key to set the attenuation to 10 dB.
4. Press the λ key.
5. Press the ▲ or ▼ key to set the calibration wavelength to the source wavelength,
increasing or decreasing the calibration wavelength until the attenuation displayed on the
front panel of the attenuator matches the power meter reading.
The attenuation on the HA9 attenuator can be set higher than 10 dB, provided that the power
meter remains linear. Attenuation settings lower than 10 dB are not recommended.
Storing a User Slope
To store a user slope:
1. Press and hold the λ key for three seconds. The attenuator is reset, that is, the attenuation
is set to 0 dB, the operating mode is set to ATT, and the display offset is set to 0 dB.
2. Set the power meter to 0 dB.
3. Press the ▲ or ▼ key to adjust the attenuation until the power meter reading reaches
10.00 dB.
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