Wiring an electret condenser microphone?
To get something more than a couple of millivolts from the mic, you must have nearly deafening sound level at the mic. That means loud shouting from distance about five centimeters or less. Then you can get something like 100mV. If your oscilloscope can show 1mV/DIV then you can see something else than a blank horizontal line when one speaks using normal voice and the distance is 50cm. If you have normal 1 MegOhm oscilloscope input, it's no use to increase the capacitance from 1uF to 100uF. 

If you need the available audio signal voltage from some weak sounds, you need a preamp. It unfortunately amplifies also the noise of mic's own electronics.

NOTE: This microphone is a low quality device. It's simply useless if you want to make low noise recordings of weak sounds such as non-shouting human speaking from several meters.