What is this, and what does it do?

[kreek]

I have two pieces of test equipment that I don't know what they do, was wondering if anyone here could enlighten me?
First is a Wavetek 1077. When I got my Wavetek 1080 sweep generator, it was attached to the bottom of it, but I've no idea what it does or how to use it.
Next is a Wavetek model FB40-50. This was also included when I got my Wavetek 1080, but again, I have no idea what it is or how to use it.