Function gen output - TTL vs 50 ohm?

[george graves]

I'm working with a function generator I recently got off of ebay.  (FG-8002)  I'm playing around with a couple circuits and wanted to use it to test a frequence to voltage converter chip - and also an arduino to measure frequency of a square wave.

It has two outputs.  50 ohm, and TTL.

When is the right situation to use one or the other? And why? And how much can it drive?

Dave?  How about a little "how to use a function gen" video? 

[shebu18]

On the function gen ou can have 10Vpp, so this means a plu 5V and a -5V, this would not work on ttl. On ttl you have 5Vpp and an offset of 2,5V so you get a maximum of 5V and a minimum of 0V on the output.

[ejeffrey]

The "50 ohm" terminal is the main output of the function generator.  The TTL terminal is the sync.  It is the same frequency and phase of your output signal, but a logic level square wave.  You use it to synchronize multiple instruments.  You can send it to your scope trigger input or you can use it with a lock-in amplifier to provide a phase reference.