UNI-T UTG2122B, Руководство пользователя

Страница: 71 / 130

UTG2000B Series 69
you use PSK function, you can see that modulation source is internal by default. You can change it with
multi-functional knob on the interface for using PSK function or by
pressing Param
→
Source
1) Internal source
In case of internal modulation source, internal modulation wave is sine wave. The phase relation between
oscillation start and stop can be designated by setting OSK rate.
2) External source
In case of external modulation source, rate will be hidden in parameter list, when an external waveform will
be used to modulate carrier waveform. OSK output phase is determined by logic level on external digital
modulation interface (FSK Trig connector). For example, when external input logic is low, carrier phase is
output; when external input logic is high, modulation phase is output.
Set vibrate time
Press the soft key and enter the period value. Range: 8ns~200ns, default is 1ms. Set OSK rate
The frequency between carrier phase and modulation phase can be set in case of internal modulation
source. After you use OSK function, you can set QPSK rate, which is in the range of 2mHz~1MHz and
100Hz by default. You can change it with multi-functional knob and direction key on the interface for using
PSK function or by pressing Rate.
Comprehensive example
First make the instrument run in OSK mode, and then set an internal sine wave of 2kHz and 2Vpp as
carrier signal. Set rate to be 100Hz and oscillation period to be 1μs. The specific steps are as follows:
(1) OSK function
Press Mod
→
Type
→
OSK successively (press soft key Type to select if Type is not highlighted)
to use OSK function.