HP ESG Series - To Set a Frequency Reference and a Frequency Offset

2-3
Using Functions
Setting Frequency and Power Levels
7. You can also adjust the RF frequency using the front panel knob. As long as frequency
is the active function (the frequency is displayed in the active entry area), the front panel
knob will increase and decrease the RF frequency. Use the front panel knob to adjust
the frequency back to 700 MHz.
To Set a Frequency Reference and a Frequency Offset
The following procedure sets the RF output frequency as a reference frequency to
which all other frequency parameters are relative. The frequency initially shown
on the display will be 0 Hz (the frequency output by the hardware minus the
reference frequency.) Although the display changes, the frequency output does not
change. Any subsequent frequency changes are shown as incremental or
decremental to 0 Hz.
1. Press Preset to return the signal generator to the factory-defined instrument state.
2. Set the RF frequency to 700 MHz.
3. Turn on frequency reference mode and set the current output frequency (700 MHz) as
the reference value. Press
Freq, Freq Ref Set. The frequency displayed is 0 Hz (the
frequency output by the hardware, 700 MHz, minus the reference value, 700 MHz).
Notice that the REF indicator is turned on and the
Freq Ref softkey has toggled to On.
4. Set the
RF On/Off key to On. Notice that the display annunciator has changed from
RF OFF to RF ON. The RF frequency at the RF OUTPUT connector is 700 MHz.
5. Increment the output frequency by 1 MHz. Press the up arrow key. 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.
6. Enter a 1 MHz offset. Press the
Freq Offset softkey and enter 1 MHz using the numeric
keypad and pressing the
MHz terminator softkey. The frequency display shows 2 MHz
(the frequency output by the hardware, 701 MHz, minus the reference frequency,
700 MHz, plus the offset, 1 MHz.) Notice that the OFFSET indicator is turned on. The
frequency at the RF OUTPUT connector is still 701 MHz.