Tektronix AFG3000 Series, User Manual

Page: 79 / 113

Operating basics
Quick Tips When a setting frequency of an output waveform is higher than 4.9 MHz, a
divided frequency that is lower than 4.9 MHz is output from the Trigger Out.
See the table below:
Set frequency of output waveform (MHz) Trigger output frequency (MHz)
〜
4.900 000 000 00 Fs
4.900 000 000 01 to 14.700 000 000 0 Fs/3
14.700 000 000 1 to 24.500 000 000 0 Fs/5
24.500 000 000 1 to 34.300 000 000 0 Fs/7
34.300 000 000 1 to 44.100 000 000 0 Fs/9
44.100 000 000 1 to 50.000 000 000 0 Fs/11
50.000 000 000 1
〜
No signal
NOTE. The Trigger Out signal cannot be output when the instrument outputs a
continuous signal higher than 50 MHz.
NOTE.
When the instrument outputs a modulation waveform, Trigger Output
signal cannot be output if you select External as the modulation source.
Adjusting Parameters of Two Channel Signals (dual-channel models only)
Phase
The AFG3000 series uses phase continuous method to change frequency. When
you change a frequency of a channel, it will affect the phase relationship between
the two channels.
For example, the instrument is generating a 5 MHz sine waveform for both CH1
and CH2 and the phase is adjusted between the two channels. If you change the
CH2 frequency to 10 MHz and then return it to 5 MHz, the CH2 phase does
not return to its initial condition. To adjust the phase relationship between the
two channels, you need to stop signal generation and restart it. The instrument
provides a function called " Align Phase" to adjust the phase relationship.
AFG3000 and AFG3000C Series User Manual 65