TFG2900A Series Function/Arbitrary Waveform Generator Users’ Guide
Suin Instruments Co., Ltd
35
In I
》
port of current channel. When external modulation signal’s amplitude is 5Vpp, DC offset is
0Vdc, pulse width difference’s displaying value will match with the real pulse width difference.
3.6.7 Sync output
: Sync signal’s duty cycle is 50%, sync signal’s frequency is equal to
modulation frequency, sync signal’s phase takes modulation signal’s phase as reference.
3.7 Sum Modulation
In Sum modulation, output waveform’s transient voltage is equal to the sum of carrier and
modulation signal’s transient voltage at the same moment.
3.7.1 Function selection
: Press
【
Modulate
】
to enter modulation function, and then press
〖
Type
〗
to display modulation type menu, press
〖
Sum
〗
, modulation type will be Sum, and display the
Sum modulation’s waveform diagram and it’s menu.
3.7.2
Carrier setting
: Usually Sine is used as carrier. Of course other built-in waveforms can also
be used, but some are not suitable. Press
【
CH1
】
to enter carrier parameter interface to set carrier
wave’s parameter. Press
【
Modulate
】
again to enter modulation parameter setting interface to set its
parameter.
3.7.3 Sum amplitude
: Press
〖
SumAmpl
〗
, you can set sum amplitude value. Superposition
amplitude means in sum modulation, modulation signal’s amplitude size overlapped in the carrier,
which is shown by carrier amplitude setting value’s percentage. When sum amplitude is set to
100%, modulation waveform’s amplitude is equal to half of carrier amplitude’s setting value.
When sum amplitude is set to 0%, modulation waveform amplitude is 0, and carrier wave
amplitude is equal to half of carrier
wave
amplitude’s setting value at this time.
3.7.4 Modulation frequency
: Press
〖
ModFreq
〗
to set modulation signal’s frequency value.
Different from other modulation type, this modulation frequency can be higher or lower than
carrier’s frequency value.
3.7.5 Modulation waveform
: You can use all of the built-in waveforms as modulation waveform.
Press
〖
Shape
〗
, you can choose modulation waveform. After it is selected, press
〖
Back
〗
, return
to modulation menu.
3.7.6 Modulation source
: Press
〖
Modulation Source
〗
to choose modulation source. If ‘Internal’ is
chosen, instrument will use internal modulation source, modulation frequency and waveform