Hardkey and Softkey Reference ESG Family Signal Generators
Phase Modulation
4-76 User’s Guide
Ext 2 AC-Coupled
This softkey lets you input an external, AC-coupled, phase modulation
signal to the EXT 2 INPUT connector. The modulation signal is tested
for voltage and a display annunciator will report a high or low condition
if the voltage is >
±
3% of 1 Vpk.
The external 2 input has multiple uses but can be used for only one
modulation at a time. If, for example, you were using the external 2
input in an amplitude modulation configuration for
AM Path 1, and then
you configured
ΦMPath2 to also use the external 2 input, the signal
generator would turn off
AM Path 1 and assign the external 2 input to
your
ΦMPath2 configuration. For the purposes of this discussion, the
external 2 AC-coupled input is the same as the external 2 DC-coupled
source.
Softkey Location:
FM/ΦM hardkey > FM ΦM softkey ΦM > ΦM Source >
Ext 2 AC-Coupled
Ext 2 DC-Coupled
This softkey lets you input an external, DC-coupled, phase modulation
signal to the EXT 2 INPUT connector.
The external 2 input has multiple uses but can be used for only one
modulation at a time. If, for example, you were using the external 2
input in an amplitude modulation configuration for
AM Path 1, and then
you configured
ΦMPath2 to also use the external 2 input, the signal
generator would turn off
AM Path 1 and assign the external 2 input to
your
ΦMPath2 configuration. For the purposes of this discussion, the
external 2 AC-coupled input is the same as the external 2 DC-coupled
source.
Softkey Location:
FM/ΦM hardkey > FM ΦM softkey ΦM > ΦM Source >
Ext 2 DC-Coupled
FM ΦM Normal High BW
This softkey toggles between the menus for FM, normal ΦM, and
wideband ΦM. Normal ΦM lets you set the phase deviation as high as N
x 90 radians with a 3 dB bandwidth of 100 kHz. Wideband ΦM provides
increased bandwidth while restricting the maximum deviation to
deviation settings up to π/2 radians (90°). The modulation bandwidth is
typically 6 MHz. For deviation settings between π/2 and 2π radians
(360°), the modulation bandwidth is typically 1.5 MHz. (These
increased bandwidths are only available using
ΦMPath1. ΦMPath2 is
limited to 1 MHz.)
Default Value: FM
Softkey Location:
FM/ΦM hardkey > FM ΦM softkey once for normal
bandwidth or twice for high bandwidth
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