TFG2900A Series Function/Arbitrary Waveform Generator Users’ Guide
Suin Instruments Co., Ltd
37
rate value. FSK rate is usually lower than carrier frequency and hop frequency.
3.8.5 Trigger source
: Press
〖
Trigger Source
〗
to choose trigger source. If ‘Internal’ is chosen,
instrument will use internal trigger source, FSK rate setting is effective. If ‘External’ is chosen,
instrument will use external trigger source, FSK rate setting will be ignored. Input external trigger
signal from rear panel’s
《
Trig In/Out
》
port.
When it is inFSK, input external trigger signal from rear panel’s
《
Trig In/Out
》
port.
When it is in 4FSK or nFSK, input two external trigger signal. As CH1 and CH2 share one
external trigger signal, and CH3 and CH4 share another external trigger signal, then CH1 and CH2
can’t be set as external trigger at the same time, nor can CH3 and CH4. When CH1 is set to
external trigger, input the lower trigger signal from rear panel’s
《
Trig In/Out
》
port of CH1, and
input the higher from
《
Trig In/Out
》
interface of CH2. When CH2 is set to external trigger, Input the
lower trigger signal from rear panel’s
《
Trig In/Out
》
port of CH2, and input the higher from
《
Trig
In/Out
》
interface of CH1. CH3 and CH4 are same as CH1 and CH2.
3.8.6 Trigger polarity
: Press
〖
Polarity
〗
to choose external trigger signal’s polarity. It is only
effective for external trigger.
When it is positive:
FSK setting: when trigger signal is 0, it will output carrier frequency; and when trigger signal is 1,
hop frequency will be output.
4FSK setting: when trigger signal is 00, it will output carrier frequency.
when trigger signal is 01, it will output hop frequency 1.
when trigger signal is 10, it will output hop frequency 2.
when trigger signal is 11, it will output hop frequency 3.
When it is negative:
FSK setting: when trigger signal is 1, it will output carrier frequency; and when trigger signal is 0,
hop frequency will be output.
4FSK setting: when trigger signal is 00, it will output carrier frequency.
when trigger signal is 01, it will output hop frequency 1.
when trigger signal is 10, it will output hop frequency 2.