Fundamental Operation
Configuring the RF Output
Chapter 2 23
Setting the Amplitude Reference and Amplitude Offset
The following procedure sets the RF output power as an amplitude reference to which all
other amplitude parameters are relative. The amplitude initially shown on the display will be
0 dB (the power output by the hardware minus the reference power). Although the display
changes, the output power does not change. Any subsequent power changes are shown as
incremental or decremental to 0 dB.
1. Press
Preset.
2. Press
Amplitude > −20 > dBm.
3. Press
More (1 of 2) > Ampl Ref Set.
This activates the amplitude reference mode and sets the current output power (
−
20 dBm)
as the reference value. The AMPLITUDE area displays 0.00 dB (the power output by the
hardware,
−
20 dBm, minus the reference value,
−
20 dBm). The REF indicator is activated
and the
Ampl Ref Off On softkey has toggled to On.
4. Press
RF On/Off.
The display annunciator has changed from RF OFF to RF ON. The power at the
RF OUTPUT connector is
−
20 dBm.
5. Press
Incr Set > 10 > dB.
This changes the amplitude increment value to 10 dB.
6. Use the up arrow key to increase the output power by 10 dB.
The AMPLITUDE area displays 10.00 dB (the power output by the hardware,
−
20 dBm plus 10 dBm, minus the reference power,
−
20 dBm) and the output power
changes to
−
10 dBm.
7. Press
Ampl Offset > 10 > dB.
This enters a 10 dB offset. The AMPLITUDE area displays 20.00 dB (the power output by
the hardware,
−
10 dBm; minus the reference power,
−
20 dBm; plus the offset, 10 dB). The
OFFS indicator is activated. The power at the RF OUTPUT connector is still
−
10 dBm.
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