ESG Family Signal Generators Hardkey and Softkey Reference
FM
User’s Guide 4-25
FM Dev
Use this softkey to set the frequency modulation deviation for the
FM Path 1 and FM Path 2 configurations. To change the value of the FM
deviation, press the softkey once. The current value for FM deviation is
displayed in the active entry area. To enter a new value, rotate the front
panel knob until the desired value is displayed, use the up and down
arrow keys, or enter the value using the numeric keypad and press the
Hz, kHz, MHz, or GHz terminator softkey. The range of values allowed
depends on the carrier frequency. The maximum peak deviation for a
frequency is calculated by multiplying N times 10 MHz. (Table 4-1 lists
the values for N and the resulting maximum peak deviations.)
Table 4-1 Maximum Deviation Values for Frequency
Modulation
For example, if you choose a carrier frequency of 400 MHz, multiply 0.5
by 10 MHz resulting in a 5 MHz maximum peak deviation.
Notice that the new value of FM deviation applies only to whichever
FM path configuration you have currently selected. Also, whenever
FM Path 1 is used with FM Path 2, the deviation for FM Path 1 must be
greater than or equal to the deviation for
FM Path 2.
Default Value: 1 kHz
Softkey Location:
FM/ΦM > FM Dev
Or: FM/ΦM > FM Waveform > Dual-Sine > FM Dev
FM Dev Couple Off On
Toggles the FM deviation coupling on and off. Turning on FM deviation
coupling links the FM deviation values of
FM Path 1 and FM Path 2. When
the values are coupled, any change you make to one FM deviation value
is applied to both FM deviation values.
Default Value: Off
Softkey Location:
FM/ΦM > FM Dev Couple Off On
Carrier Frequency N
Maximum
Peak Deviation
250 kHz to
≤
249.999 MHz 1 10 MHz
> 249.999 MHz to
≤
500 MHz 0.5 5 MHz
> 500 MHz to
≤
1 GHz 1 10 MHz
> 1 GHz to
≤
2 GHz 2 20 MHz
> 2 GHz to 4 GHz 4 40 MHz
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