ESG Family Signal Generators Using Functions
Setting Frequency and Power Levels
User’s Guide 2-3
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.
To Set the RF Output Power Level
1. Press Preset to return the signal generator to the factory-defined instrument state.
2. Observe the amplitude area of the display (in the upper middle of the display). It should
display
−
135 dBm. This is the normal preset RF output power level.
3. The signal generator is set to output an RF signal, however the
RF On/Off key must be set
to
On before the RF signal is available at the RF OUTPUT connector. Press RF On/Off.
Notice that the display annunciator changes from
RF OFF to RF ON. The RF signal is
now being output at a −135 dBm level at the RF OUTPUT connector.
4. Change the power level to −20 dBm. Press
Amplitude. The current power level is now
displayed in the active entry area of the display. Using the numeric keypad and the key,
enter
−20 and then press the dBm softkey. The new −20 dBm RF output power is now
displayed in the amplitude area of the display and also in the active entry area.
5. 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 front
panel knob. Practice changing the amplitude using these methods also.
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