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TJ and Timmy:
Are you talking about an analog or digital meter?
If analog (mechanical movement), no cap whatsoever is needed.
If digital (and I have never attempted to use a digital milliameter in that application AND WOULD NEVER), put as large a cap as possible across it, preferably several thousand mf.
This is because the waveform is complex and spikey and the meter will go nuts on that unfiltered waveform.
Considering that the meter presents a very low circuit impedance, a very large capacitance would be needed to attempt to smooth it. Even then i would not trust it.
Lacking an analog meter, i would use a #44 light bulb to accurately 'dip' the cathode current (as discussed in another thread).
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