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8.3.5
Modulation Frequency
When internal modulation source is selected, press [Mod] >
the frequency of the modulating waveform.
⚫
Use the numeric keypad or direction keys and knob to enter the desired frequency
values.
⚫
The modulating waveform frequency range is 2mHz to 1MHz, and the default value
is 100Hz.
Note: This menu will be grayed out and disabled when other modulation sources
except the internal modulation source are selected.
8.3.6
Frequency Deviation
Frequency deviation is the deviation of the modulating waveform frequency relative to
the carrier frequency. Press [Mod] >
deviation.
⚫
Frequency deviation must be lower than or equal to the carrier frequency.
⚫
Attempting to set a deviation greater than the carrier frequency will cause the
instrument to set the deviation equal to the carrier frequency.
⚫
The sum of frequency deviation and carrier frequency must be lower than or equal
to the sum of the current carrier frequency upper limit and 1kHz.
When external modulation source is selected, the frequency deviation is controlled by
the ±4V signal level on the [FSK/Trig/Sync/Extmod] connector on the rear panel.
Positive signal level corresponds to frequency increase and negative signal level
corresponds to frequency decrease. The lower the level, the less offset is generated.
For example, if the frequency deviation is set to 1KHz, +4V signal level corresponds to a
1kHz increase of frequency and -4V signal level corresponds to a 1kHz decrease of
frequency.
8.4
PM Modulation
A modulated waveform consists of a carrier waveform and a modulating waveform. In
PM, the carrier phase is varied by the voltage level of the modulating waveform.
8.4.1
Select PM Modulation
Press [Mod] >
⚫
When
Mod
Copyright © Qingdao Hantek Electronics Co., LTD
Deviation
Type
>
PM
softkey to enable PM function.
is enabled,
Sweep
or
Burst
Frequency
softkey to set the FM frequency
will be disabled automatically.
HDG3000B User manual
Modulation
softkey to set
41
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