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Put a low value resistor in series with the earthy end and measure the AC volt drop across it. If the frequency is too high for your meter, use a diode probe to rectify the AC, there will be errors if the voltage is below, say 1.5V. If the indication on the meter, which is measuring DC V, is low, note the reading and feed the diode detector with 50 HZ AC to get the same DC output. Then measure the 50 HZ AC with your meter. You might have to change the time constants of the detector fpr the 50 HZ measurement.
Frank
Would add that you should use a very low inductance resistor for this test with 'high frequency' being quoted, but not specified, by the OP.
A fairly crude but simple method to achieve this can be to parallel connect 10 10 Ohm resistors in parallel, other values also to provide the 1 Ohm, but the more the better as the individual shunt inductance is reduced by paralleling.
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