Key Reference
F
Chapter 5148
FM Source
Supported PSG-A Series
Use this softkey to access a menu of choices that enables you to select an internally
generated or externally applied modulation input for the frequency modulation source.
The internal modulation is always ac-coupled. For externally applied signals, you can
choose between ac- and dc-coupled modulation.
FM Start Rate
Supported PSG-A Series
This softkey enables you to change the starting frequency of the internally generated
modulation source for swept-sine frequency modulation.
Preset 400.0 Hz
Range 1.0 Hz
−
1.0 MHz (minimum increment is 1.0 Hz)
Location Page 236
Remarks This key is coupled to the
FM Rate softkey in the initial FM menu and
the
FM Tone 1 Rate softkey in the FM dual-sine menu. Any value set for
FM Start Rate is reflected in the FM Rate and FM Tone 1 Rate softkeys.
Preset Internal 1
Choices Internal 1 Internal 2 Ext1 Ext2
Location Page 235
Remarks A 1.0 peak voltage 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 volt by more
than 3.0%. (The LO/HI annunciators only function for ac-coupled
external inputs.)
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