Racal Instruments 3156B, Руководство пользователя

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3156B User Manual
WaveCAD 4-22 Racal Instrument © 2005
The Modulation
Panels
The Modulation functions were designed over two separate panels, as
shown in Figures 4-9 and 4-10. The panels are invoked by pressing
the MOD1 or MOD2 buttons on the panels menu. These panels
provide access to all modulation functions and their respective run
modes and parameters. The modulation functions that are available
on both panels are: FM (frequency modulation), AM (amplitude
modulation), FSK (frequency shift keying), Sweep and Frequency
Hops. Using WaveCAD, modulation is programmed simultaneously for
both channels however, using external utilities, each channel can be
programmed to output different waveform types. The legal options for
programming both channels are summarized in Table 3-1. When
modulation is Off, the 3156B generates carrier signal (sinewave) at a
frequency set by the carrier frequency parameter.
Besides the Modulation Mode and Enable groups which are common
to both panels, each pf the modulation panels has a different set of
functions and parameters. These groups are described below.
Figure 4-9 The Modulation Panel 1
Modulation
The Modulation Group provides selection of modulation function.
When the Off button is pressed, the instrument generates carrier
signal (sinewave) at a frequency set by the carrier frequency
parameter. Note that the modulation group buttons also appear on the
Modulation Panel 2. It doesn’t really matter if you select the function
from either panel 1 or 2.