Two Arbitrary function generators

[Housedad]

What would be the advantage?  I have a  Rigol DG1022 and have a opportunity to get another at a decent price.

[jpb]

As it is a two channel instrument and personally, though I sometimes use two channels on my Agilent generator I have never felt the need for more, the only "advantages" I can see are:

1.) it would give you two channels at 10Vpp (channel 2 is only 3Vpp) but I can't see this being a frequent need.
2.) you'd have a backup if one broke.
3.) You could produce 4 outputs.
4.) You could use one to modulate the other - not much of an advantage as you can use internal modulation.

2 channels is definitely useful if you want to do things with mixers but 4 channels is a less obvious need.

One use I have found with my Agilent for the 10Vpp is when I want to use ARBs to generate higher frequencies. The upper limit on my instrument in theory is 30MHz but as it is 250MS/s I can generate nice sines up to 100MHz but these are greatly attenuated as the output is basically a low pass filter. By setting the amplitude to 9-10Vpp I get a usable amplitude of around 140mVpp at the output.

The Rigol might be the same i.e. you may be able to get up to 50MHz sines out of the 100MS/s arbs.