How to get two Sweep and Repeat Generators in sync.

[Tractor Beam]

What is the best way to make a sign wave shift frequency downward only about 10 Hertz, then repeat every .2 seconds.
The initial frequency 3000 Hz.
There will be 2 generators sweeping, both will be in sync (repeat at the same time).

See attachment for drawing.

 

[FvM]

Depends on the generator. Popular arbitrary function generators can sync their sweeps through trigger out and sync in jacks, e.g. Agilent 33220A.

 

[BradtheRad]

Many types of oscillators change frequency if you change supply voltage. Or you can 'bend' an RC time constant by changing a resistance somewhere in the circuit, or by applying a voltage at a strategic node. Many oscillators have their frequency determined from an RC time constant.