Specifications

Setting the amplitude reference and

amplitude offset

The following procedure sets the

RF output power as an amplitude

reference to which all other ampli-

tude parameters are relative. The

amplitude initially shown on the dis-

play will be 0 dB (the power output

by the hardware minus the refer-

ence power). Although the display

changes, the output power does

not change. Any subsequent power

changes are shown as incremental

or decremental to 0 dB.

Instruction Note

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. Use the up arrow key to increase the The AMPLITUDE area displays 10.00 dB

output power by 10 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.

6. 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.