Operating and Maintenance Instructions – 24
Setting the Power
The attenuator has no internal power measurement capability, but by using the display-offset
feature of the attenuator, the display can be matched with the help of an external power meter.
To set the power:
1. Ensure that the attenuator is set to PWR mode (the display is in dBm).
2. Press the ▲ or ▼ key to adjust the output power.
3. Ensure that the source power and connection losses are stable during the calibration
procedures and subsequent device testing.
Controlling the Driver
If the HA9 attenuator is equipped with a 1x2 switch, the DRIVER key controls the switch state,
for example, off = Channel 1, on = Channel 2.
1. To activate the driver, press the DRIVER key. The key lamp lights.
2. To deactivate the driver, press the DRIVER key. The key lamp turns off.
Resetting the Attenuator
To reset the attenuator:
1. Press the λ key and hold it for three seconds. The attenuator is reset to the following
configuration:
wavelength = 1310 nm
attenuation = 0 dB
mode = ATT
display offset = 0 dB
If the reset procedure fails, the attenuator displays an error message.
Checking Attenuator Calibration
The attenuator is factory-calibrated, but wavelength calibration and insertion loss can be
verified.
Required Equipment
The following equipment is required:
• Light source for the wavelength at which the calibration is being verified, for example, a
1550 nm source for calibration verification at 1550 nm. (Record the exact peak center
wavelength of the source for future reference.)
• Power meter that is accurate up to at least -90 dBm and has a resolution of at least 0.1 dB
• Appropriate jumpers (FC/PC or FC/APC, as required)
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