Operating and Maintenance Instructions – 23
4. Press the λ key.
5. Press the 0 dB key. The calibration wavelength changes to “user”, and the displayed
attenuation changes to 10.00 dB.
6. To cancel the user slope, reset the attenuator or switch to λ mode, and then press the
corresponding ▲ or ▼ key.
Setting the Display Offset
The attenuator uses separate display offsets for ATT and PWR mode. The minimum offset
level is 0 dB and the maximum is 99.99 dB.
Setting the Display Offset in ATT Mode
In Attenuation mode, the display offset is used to include both the insertion loss of the
attenuator and any connection losses in the attenuation value displayed.
To set the offset:
1. Ensure that the attenuator is in ATT mode (readings are in dB). (If not in ATT mode, press
the ATT/PWR key.) The attenuator displays the offset (OFFS) that is added to (or
subtracted from) the actual attenuation (XX.XX), for example, OFFS XX.XX dB. The offset
value is displayed to two decimal places.
2. Press the OFFS key. The key lamp lights to indicate that the attenuator is ready to read the
offset value.
3. Press the 0 dB key to set the display offset to 0 dB.
4. To use an offset other than 0 dB, press the ▲ or ▼ key to adjust the setting. The OFFS
status LED lights.
Setting the Display Offset in PWR Mode
In Power mode, the display offset is used to match the power displayed by the attenuator to a
power meter reading in dBm.
To set the offset:
1. Ensure that the attenuator is in PWR mode (the display is in dBm). (If not in Power mode,
press the ATT/PWR key.) The attenuator displays the output power including the offset, for
example, DISP XX.XX dBm.
2. Press the OFFS key. The key lamp lights to indicate that the attenuator is ready to read the
offset value.
3. Press the 0 dB key to set the display offset to 0 dB.
4. To use an offset other than 0 dB, press the ▲ or ▼ key to adjust the setting. The OFFS
status LED lights.
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