Brüel & Kjaer Exciter Control 1047 teardown

[WackyGerman]

Here are some teardown photos of my Exciter Control 1047 which I get from a good friend as a christmas gift 

[WackyGerman]

Unfortunately I don t have any documents for this unit . Sweeping works fine but there seem to be many other functions I don t know . Some parts are from 1974 , a nice vintage kit in a good optical condition 

[Vgkid]

What is it used for?

[R005T3r]

Here is explained:
https://en.wikipedia.org/wiki/Exciter_(effect)

[slab]

I was wondering if you ever found a documentation for the Brüel & Kjaer - Type 1047.
I have one myself and having issue understanding most of the functions.

Till today I could only get the main Output to work (sinewave ok, freq ok, upper/lower limit ok).
But not the Fixed Osc. or the Variable Osc. output. Nor the Input actually.