National Instruments QuickSyn FSW-0010, QuickSyn FSW-0020 User Manual page 28

QuickSyn Frequency Synthesizer
internal "pull-up" resistor to keep power on when there is nothing
connected to the Pulse input connector. To maximize the pulse-
modulation on-off ratio, set the Synthesizer's output power from
the Main Control panel to maximum power. By default pulse
modulation is off.
Amplitude This button is used to select amplitude modulation
(AM). To utilize the AM mode, connect an AM source to the
Synthesizer's AM input connector located on the front panel of
the Synthesizer (see Figure 32) and select the Amplitude button
on the main control panel. The button will illuminate to indicate
that amplitude modulation is on, and the Synthesizer will accept
modulating signals between DC and 100 kHz within ±1 V (2 V p-p)
amplitude. For optimal performance, set the Synthesizer's output
power from the Main Control panel to the middle of the available
power range. By default AM is off.
AM Sensitivity % This slider and accompanying entry box enables
the user to set AM sensitivity, which is dependent on Synthesizer
output frequency. To set the desired sensitivity, move the slider left
or right to the desired value or enter the value in the entry box.
Frequency This button is used to select frequency modulation (FM).
To utilize the FM mode, connect an FM source to the Synthesizer's
FM input connector located on the front panel of the Synthesizer (see
Figure 32). From the Main Control panel, select the Frequency button
and one of the four FM modes. The Frequency button will illuminate
to indicate that frequency modulation is on. The Synthesizer will ac-
cept modulating signals between ±1 V (2 V p-p). By default FM is off.
FM Sensitivity % This slider and accompanying entry box enables
the user to set FM sensitivity, which is dependent on Synthesizer
output frequency. To set the desired sensitivity, move the slider left
or right to the desired value or enter the value in the entry box.
FM WB, FM NB 1, FM NB 2, Phase Modulation These
buttons enable the user to choose the desired FM mode.
• When FM WB is selected, the Synthesizer modulation rate range
is 50 kHz to 1 MHz.
• When FM NB 1 is selected, the Synthesizer modulation rate
range is 100 Hz to 10 kHz.
• When FM NB 2 is selected, the Synthesizer modulation rate
range is 10 kHz to 100 kHz.
• When Phase Modulation is selected, the Synthesizer modulation
rate range is DC to 100 kHz.
The Synthesizer's default FM mode is FM WB.
User Guide
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