74 UTG2000B Series
● ModWave Square wave: duty ratio is 50%
● Rising ramp wave: symmetry degree is 100%
● Falling ramp wave: symmetry degree is 0%
● Arbitrary wave: when selecting arbitrary wave as modulation waveform, function/arbitrary
waveform generator limits length of arbitrary wave to 4kpts by automatic test count. Noise: white
● Gaussian noise
2) External source
In case of external modulation source, modulation wave and frequency will be hidden in parameter
list, when an external waveform will be used to modulate carrier waveform.
SUM depth is controlled by ±5V signal level on external analog modulation input terminal
(Modulation In connector) of back panel. For example, if modulation depth in parameter list is set
to be 100%, SUM output amplitude is the maximum when external modulation signal is +5V and
the minimum when external modulation signal is -5V.
Set frequency of modulation wave
The frequency of modulation wave can be set in case of internal modulation source. After you use
SUM function, you can see that default frequency of modulation wave is 100Hz. You can change it
with multi-functional knob and direction key on interface for using
amplitude modulation function or by pressing Param →
ModFreq . The range of modulation
frequency is 2mHz~1MHz. In case of external modulation source, modulation wave and frequency
will be hidden in parameter list, when an external waveform will be used to modulate carrier
waveform. The frequency range of modulation signal of external input is 0Hz~20kHz.
Set modulation depth
Modulation depth is degree of amplitude change, expressed in percentage. The range of SUM
depth is 0%~100%, 100% by default. When modulation depth is 0%, carrier wave is output. When
modulation depth is 100%, modulation wave is output. You can change it with multi-functional
knob and direction key on interface for using amplitude modulation function or by pressing Depth .
In case of external modulation source, the output amplitude of instrument is also controlled by±5V
signal level on external analog modulation input terminal (Modulation In connector) of back panel.
Comprehensive example
First make the instrument run in SUM mode, and then set an internal sine wave of 1kHz as
modulation signal and a square wave with frequency of 2kHz, amplitude of 200mVpp and duty ratio
of 45% as carrier signal. Finally set modulation depth to be 80%. The specific steps are as follows:
(1) Use SUM function
Press Menu → Mod → Type →
SUM (Type to select ,if Type is not(press soft key
highlighted).
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