Analog Vom and AC reading
You need an oscilloscope for this, not a meter.  

Meters "average" either electronically or mechanically.  If, however, you simply need to block DC while trying to measure a superimposed AC, just use a capacitor in series with the signal.  The cap will block any DC and will allow AC through.  Since the input impedance on a meter is relatively high, you just need to choose a capacitor that has a high enough voltage rating and a high enough capacitance so that it's effective resistance is small compared to the input impedance of the meter if you are wanting to get a precise AC voltage measurement.