UNI-T UTG2122B, Руководство пользователя

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58 UTG2000B Series
1) Internal Source
When modulation source is internal, internal modulation wave is a square wave of 50% duty ratio (not
adjustable). The PSK rate can be set to customize the moving frequency between carrier wave phase and
modulation phase.
2) External Source
When modulation source is external, carrier waveform will be modulated by an external waveform. Carrier
wave phase will be output when external input logic is low, and modulation phase will be output when
external input logic is high.
PSK Rate Setting
When modulation source is internal, the moving frequency between carrier wave phase and modulation
phase can be set. After enabling PSK function, PSK rate can be set and the settable range is 2mHz to
1MHz, the default rate is 100Hz. If need to change, press
Param
→
Rate in turn.
Modulation Phase Setting
Modulation phase indicates the change between the phases of PSK modulated waveform and the phase of
carrier wave phase. Settable range of PSK phase is from
0˚ to 360˚, and the default value is 180˚. If need to
change, press Param
→
Phase in turn.
Comprehensive Example
Make the instrument work in phase shift keying (PSK) mode, then set a sine wave with 2kHz and 2Vpp
from the internal of the instrument as a carrier wave signal, finally, make carrier wave phase and
modulation phase move between each other with 1kHz frequency. Specific steps are seen as following:
Enable Phase Shift Keying (PSK) Function
Press Menu
→
Mod
→
Type
→
PSK in turn to start the PSK function.