3152A User Manual
Using The Instrument 3-50
Racal Instruments
©
2001
Amplitude
Modulation
Commands
Arbitrary waveforms stored in memory segments are used as
modulating envelopes in Amplitude Modulation mode. The
modulated carrier is always a sine waveform with its frequency
set in points. The first step in modulating a waveform is to
generate an arbitrary waveform either from the standard
function library or by downloading a waveform from the
controller.
The command:
AM <value>
sets the internal modulation depth in percent. Select values
from 1% to 200%. The default setting for AM depth is 50%.
The query:
AM?
queries the modulation depth and returns a value in percent.
The command:
AM:INTernal:FREQuency
<value>
sets the frequency of the carrier sine waveform. The frequency
of the carrier wave is programmed in points. Select from 10 to
500 points. The default setting for the carrier frequency is 100
points. The frequency of the carrier wave can be computed from
the sampling clock frequency divided by the number of points in
the active segment. Use the FREQ:RAST? command to
determine the current sampling clock frequency. The maximum
carrier frequency is the sampling clock frequency divided by 10
points. The envelope frequency should be less than the carrier
frequency.
The query:
AM:INTernal:FREQuency?
queries the carrier frequency and returns a value in points.
The command:
AM:EXECute
enables amplitude modulation. To ensure proper operation,
enable the amplitude modulation after setting up the other
modulation parameters. Amplitude modulation cannot be turned
on and off. Therefore, ensure that the original arbitrary
waveform is available in another memory segment as a back-
up.
Содержание 3152A
Страница 5: ......
Страница 6: ...This page was left intentionally blank...
Страница 18: ...3152A User Manual xii This page was left intentionally blank...
Страница 25: ...3152A User Manual Racal Instruments 2001 Getting Started 1 7 Figure 1 2 3152A Front Panel...
Страница 156: ...3152A User Manual Product Support 6 4 Racal Instruments 2001 This page was left intentionally blank...