UTG2000B Series 41
1) Internal Source
When modulation source is internal, modulation wave can be: sine wave, square wave, rising ramp
wave, falling ramp wave, arbitrary wave and noise.After enabling FM function, the default of
modulation wave is sine wave. If need to change, press Param
→
ModWave in turn.
●
Square wave: duty ratio is 50%
●
Lead Ramp Wave: symmetry degree is 100%
●
Tail Ramp Wave: symmetry degree is 0%
●
Arbitrary Wave: Arbitrary wave length limit is 4kpts
●
Noise: White Gauss noise
2) External Source
When modulation source is external, carrier waveform will be modulated by an external waveform.
PM phase deviation is controlled by ±5V signal level of external modulation input terminal on rear
panel. For example, if phase deviation value in parameter list has been set to 180˚, +5V of external
modulation signal is equivalent to 180˚ phase shift. Lower external signal produce smaller
deviation.
Modulation wave Frequency Setting
When modulation source is internal, frequency of modulation wave can be modulated. After
enabling PM function, the default of modulation wave frequency is 100Hz. If need to change, press
Param
→
ModFreq in turn, and the modulation frequency range is 2mHz to 1MHz. When
modulation source is external, carrier waveform will be modulated by an external waveform. The
range of modulation signal input from external is 0Hz to 20Hz.
Phase Deviation Setting
Phase deviation indicates the change between the phases of PM modulated waveform and the
phase of carrier wave phase. Settable range of PM phase deviation is from 0˚ to 360˚, and the
default value is 180˚. If need to change, press
Param
→
Phase Dev in turn.
Comprehensive Example
Firstly, make the instrument work in phase modulation (PM) mode, then set a sine wave with 200Hz
from the internal of the instrument as a modulation signal and a square with frequency of 900Hz
and amplitude of 100mVpp as a carrier wave signal. Finally, set the phase
deviation to 200˚. Specific
steps are seen as following:
Содержание UTG2122B
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