Many years ago I built up a circuit using the ICL8038 as a quick "scope checker" for items such as amplitude, timebase, and linearity. The frequency is fixed at approximately 5KHz and I used trim pots to fix the amplitude at 0.5v p-p for the square wave, sine wave, and triangle wave. Schematic attached. You can use this as guide for your own design.
And here's an example on the Tek 2465: