4.1.2 Frequency Modulation (FM)
In frequency modulation, the modulated waveform generally is composed
of carrier wave and modulation wave. The frequency of carrier wave will
vary with amplitude of modulation wave.
Press the Mode button, then move the cursor to FM by and press OK
to enable FM. The instrument will output the modulated waveform with the
currently set modulation wave and carrier wave.
Picture 4-9 Enable FM modulation
Select carrier waveform
The carrier waveform can be: sine wave, pulse wave, ramp wave or arbitrary
wave, the default is sine wave. After selecting the FM modulation, press the
STD/MOD button and STD is selected.
Picture 4-10 Set FM carrier waveform
Select the carrier waveform by pressing the waveform selection button:
Set carrier frequency
Carrier frequency range varies with carrier waveform. The default frequency
of all carrier waves is 1kHz. See table 4-2 below for frequency ranges of
carrier waves:
Table 4-2:
Frequency
UTG9002C-II
UTG9005C-II
Min
1μHz
1μHz
1μHz
1μHz
Max
2MHz
2MHz
200kHz
1MHz
Min
1μHz
1μHz
1μHz
1μHz
Max
5MHz
5MHz
200kHz
1MHz
Carrier waveform
Sine wave
Square wave
Ramp wave
Arbitrary wave
To set the carrier frequency, when the STD carrier wave is selected, press
the Freq button and enter the required value, then select the unit to complete.
UTG9000C-II User Manual
