Specifications

5
Setting the frequency reference
and frequency offset
The following procedure sets the
RF output frequency as a reference
frequency to which all other fre-
quency parameters are relative. The
frequency initially shown on the dis-
play will be 0.00 Hz (the frequency
output by the hardware minus the
reference frequency). Although the
display changes, the frequency
output does not change. Any subse-
quent frequency changes are shown
as incremental or decremental to
0 Hz.
Instruction Note
1. Press [Preset].
2. Press [Frequency] > [700] > {MHz}.
3. Press {Freq Ref Set}. This activates the frequency reference mode and
sets the current output frequency (700 MHz) as the
reference value. The frequency displayed is
0.00 Hz
(the frequency output by the hardware, 700 MHz,
minus the reference value, 700 MHz). The
REF
indicator is activated and the {Freq 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 RF frequency at the RF OUTPUT
connector is 700 MHz.
5. Press [Frequency] > {Incr Set} > [1] > {MHz}. This changes the frequency increment value
to 1 MHz.
6. Press the up arrow key. This increments the output frequency by 1 MHz.
The frequency display changes to show 1 MHz
(the frequency output by the hardware,
700 MHz + 1 MHz, minus the reference frequency,
700 MHz) and the output frequency changes
to 701 MHz.
7. Press [Freq Offset] > [1] > {MHz}. This enters a 1 MHz offset. The frequency display
shows
2.000 000 00 MHz (the frequency output by
the hardware, 701 MHz, minus the reference
frequency, 700 MHz, plus the offset, 1 MHz). The
OFFS indicator is activated. The frequency at the
RF OUTPUT connector is still 701 MHz.
Instruction Note
1. Press [Preset].
2. Observe the AMPLITUDE area of the display
(in the upper middle of the display). The display
reads
–135.00 dBm. This is the normal
preset RF output amplitude.
3. Press [RF On/Off]. The display annunciator changes from RF OFF to
RF ON. The RF signal is now being output at an
amplitude of –135 dBm at the RF OUTPUT
connector.
4. Press [Amplitude] > [–20] > {dBm}. This changes the amplitude to –20 dBm. The new
–20 dBm RF output power is now displayed in the
AMPLITUDE area of the display and also in the
active entry area.
Amplitude is still the active function until you press
another front panel function key. You can also
change the amplitude using the up and down arrow
keys and the knob.
5. Practice changing the amplitude using
the arrow keys and the knob.
Setting the RF output amplitude