I think, the way this meter works, that "(1000mfd on up)" is simply too large for the meter to read correctly.the negative value occurs only on large value caps(1000mfd on up)
Did not read how this meter works. The one I have starts out with 1.0nF and 100uH and finds the resonance frequency. Then places the unknown cap across the 1.0nF reference cap and measures the frequency. Does math and displays the results.
>I think C_unknown and C_ref need to be closer in value.
>I think 100k ohms is not enough current for "(1000mfd on up)" to work right.
>Yes I know this is how my meter measures C and not ESR.
>Point is that my meter for measuring BIG capacitors does not work in this mode, at all. Different way.
>Really big caps have problems that this meter can not deal with.