TFG6800 Series Function/Arbitrary Waveform Generator Users’ Guide
Suin Instruments Co., Ltd
37
PSK rate is usually lower than carrier frequency.
3.9.5
Trigger source
: Press
〖
Source
〗
, you can choose trigger source. If ‘Internal’ is chosen,
instrument will use internal trigger source, PSK rate setting is effective. If ‘External’ is chosen,
instrument will use external trigger source, PSK rate setting will be ignored. Input external trigger
signal from rear panel’s
《
Trigger In/Out
》
port.
When it is PSK, you should input trigger signal from rear panel’s
《
Trigger In/Out
》
port.
When it is 4PSK or nPSK, you should input two external trigger signals. As CH1 and CH2 share
one external trigger signal, then CH1 and CH2 can’t be set as external trigger at the same time,
When CH1 is set to external trigger, input the lower trigger signal from rear panel’s
《
Trigger
In/Out
》
port of CH1 and input the higher from
《
Trigger In/Out
》
port of CH2. When CH2 is set
to external trigger, input the lower trigger signal from rear panel’s
《
Trigger In/Out
》
port of CH2
and input the higher from
《
Trigger In/Out
》
port of CH1.
3.9.6
Trigger polarity
: Press
〖
Trigger Polarity
〗
to choose external trigger signal’s polarity. It is
only effective for external trigger.
When it is positive:
PSK setting: when trigger signal is 0, it will output carrier phase; and when trigger signal is 1, hop
phase will be output.
4PSK setting: when trigger signal is 00, it will output carrier phase.
when trigger signal is 01, it will output hop phase 1.
when trigger signal is 10, it will output hop phase 2.
when trigger signal is 11, it will output hop phase 3.
When it is negative:
PSK setting: when trigger signal is 1, it will output carrier phase; and when trigger signal is 0, hop
phase will be output.
4PSK setting: when trigger signal is 00, it will output carrier phase.
when trigger signal is 01, it will output hop phase 1.
when trigger signal is 10, it will output hop phase 2.
when trigger signal is 11, it will output hop phase 3.