ESG Family Signal Generators Hardkey and Softkey Reference
FM
User’s Guide 4-27
FM Rate
Use this softkey to change the internal modulation frequency for the
FM Path 1 and FM Path 2 configurations. To change the value, press the
softkey once. The current value for FM rate 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 or kHz terminator
softkey. The range of values allowed is 0.1 Hz to 10 kHz. (0.1 Hz to
50 kHz is the range allowed if sinewave is selected as the internal
waveform.) The minimum increment allowed is 0.1 Hz. Notice that the
new value of FM rate applies only to whichever FM path configuration
you have currently selected.
Default Value: 400 Hz
Softkey Location:
FM/ΦM > FM Rate
FM Source
Pressing this softkey reveals a menu of choices for frequency
modulation sources. You can choose internally-generated frequency
modulation or select an externally-applied signal from either the EXT
1 INPUT or EXT 2 INPUT connectors. The internal modulation is
always AC-coupled. For the externally-applied signals, you can choose
between AC- and DC-coupled modulation. A 1.0 Vpk input is required
for calibrated FM deviation settings. The
EXT 1 LO/HI and
EXT 2 LO/HI display annunciators will turn on if the peak input voltage
differs from 1.0 Vpk by more than 3%. (The LO/HI annunciators only
function for AC-coupled external inputs.)
The internal and external 1 and 2 sources have multiple uses. You can
use them for amplitude, frequency, and phase modulation. For burst
modulation, you can only use the external 1 source. You must use the
external 2 source for pulse modulation. However, any given source can
only be routed to one enabled modulation at a time. If, for example, you
were using the external 1 source in a frequency modulation
configuration for
FM Path 1, and then you configured AM Path 2 to also use
the external 1 source, the signal generator would turn off
FM Path 1 and
assign the external 1 source to your
AM Path 2 configuration. Notice that
for these purposes the external 1 AC-coupled source is the same as the
external 1 DC-coupled source and the external 2 AC-coupled source is
the same as the external 2 DC-coupled source.
Default Value: Internal
Softkey Location:
FM/ΦM > FM Source
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