ESG Family Signal Generators Hardkey and Softkey Reference
Ampl
User’s Guide 4-17
Amplitude reference mode only changes the display; it does not change
the RF output power. For example, if you set your RF output power to
−
20 dBm, set your reference value, and then turn amplitude reference
mode on, your display shows your amplitude as 0 dB but your output
power remains at
−
20 dBm.
Default Value: Off
Softkey Location:
Ampl > Ampl Ref Off On
Atten Hold Off On
This softkey toggles the attenuator hold function on and off. Turn
attenuator hold on to freeze the attenuator at its current setting. The
ATTN HOLD display annunciator will turn on. Use this function at any
time you want to guarantee that there will be no power discontinuity
normally associated with the attenuator switching during power
adjustments. (When the attenuator is held, only a frequency change
will change the attenuator setting. There will be no attenuator
switching during power adjustments.) With attenuator hold on, the
maximum power adjustment range will vary. However, you will have at
least +4 dB and at least
−
13 dB range.
Default Value: Off
Softkey Location:
Ampl > Atten Hold Off On
Do Power Search
Press this softkey to execute the power search routine one time. Power
search is an internal calibration routine used to achieve calibrated
output power when the ALC is off. You can execute a power search at
any time by pressing this softkey. If you are using external I/Q
modulation, the power search routine assumes that the I/Q input level
is = 0.5 V
rms
.
Actual output amplitude will scale directly with .
The
ALC Off On softkey must be set to Off in order to execute the power
search routine.
Softkey Location:
Ampl > ALC Off On > Do Power Search
Manual Trigger Main Delta (Option UNA Only)
Press this softkey to toggle the RF output power between main and
alternate (delta). When Main is highlighted, the main power is present
at the RF output and when Delta is highlighted, the alternate power is
present at the RF output.
Default Value: Main
Softkey Location:
Ampl > Alternate Amplitude > Manual Trigger Main Delta
I
2
Q
2
+
I
2
Q
2
+
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