Agilent E8663B Analog Signal Generator User’s Guide
25
Basic Operation
Configuring the RF Output
Setting the Frequency Reference and Frequency Offset
The following procedure sets the RF output frequency as a reference frequency to which all other
frequency settings are relative. When the frequency reference is set, the display will read
0.00 Hz
(the
frequency output of the signal generator’s hardware minus the reference frequency). Although the display
changes, the actual frequency output is 700 MHz (from step 8 above). Any subsequent frequency changes
are shown as increments or decrements to the 0 Hz reference.
The Frequency Reference Set function is not an active function. Once it is set, any change to the frequency
setting appears as a frequency reading on the signal generator’s front- panel display. For example,
1.
Preset the signal generator: Press
Preset
.
2.
Set the frequency reference to 700 MHz:
Press:
Frequency
>
700
>
MHz
>
More (1 of 3)
>
Freq Ref Set
.
This activates the frequency reference mode, sets the output frequency (700 MHz) as the reference
value, and toggles the
Freq Ref
softkey On. The
FREQUENCY
area displays
0.000 Hz
. This reading is the
frequency output of the signal generator’s hardware (700 MHz) minus the reference value (700 MHz).
The signal generator’s true output frequency is 700 MHz. If the
Freq Ref
softkey is toggled to Off, the
front- panel will indicate the actual frequency: 700 MHz. The
REF
indicator appears on the front- panel
display and the
Freq Ref Off On
softkey toggles to On.
3.
Turn on the RF output: Press
RF On/Off
.
The display annunciator changes from
RF OFF
to
RF ON
. The RF frequency at the RF OUTPUT
connector is 700 MHz.
4.
Set the frequency increment value to 1 MHz: Press
Frequency
>
Incr Set
>
1
>
MHz
.
5.
Increment the output frequency by 1 MHz: Press the up arrow key.
The
FREQUENCY
area display changes to show 1.000 000 000 MHz, which is the frequency output by the
hardware (700 MHz + 1 MHz) minus the reference frequency (700 MHz). The frequency at the RF
OUTPUT changes to 701 MHz.
6.
Enter a 1 MHz offset: Press
More (1 of 3)
>
Freq Offset
>
1
>
MHz
.
The
FREQUENCY
area displays
2.000 000 00 MHz
, which is the frequency output by the hardware
(701 MHz) minus the reference frequency (700 MHz) plus the offset (1 MHz). The
OFFS
indicator
activates. The frequency at the RF OUTPUT connector is still 701 MHz.
Setting the RF Output Amplitude
1.
Preset the signal generator: Press
Preset
.
The
AMPLITUDE
area of the display shows the minimum power level of the signal generator. This is the
normal preset RF output amplitude.
2.
Turn on the RF output: Press
RF On/Off
.
The display annunciator changes to
RF ON
. At the RF OUTPUT connector, the RF signal is output at the
minimum power level.
