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Re: 37XR inductance range
Original poster: Finn Hammer <f-h@xxxx>
Mike,
You can trust the meter., however notice that the meter probably
measures mH at 1kHz, and H at 50hZ.
Also note: From posts I made 28-12-05
Mike,
Pls. notice that few LCR meters can supply enough current to produce
a usefull measurement on iron cored inductors. By exciting the
windings with a typical LCR meter, the iron will be operating in the
low "initial permeability" area of the B-H curve, and the readings
will turn out to be too small.
Instead, you should connect the windings across a variac, with a
Ammeter in series, and calculate inductance according to:
u = wLi
W = Omega = 2*pi*frequency = 2 * 3.14 * 60 = 377
Cheers, Finn Hammer
Yes, "u" is voltage across inductor being measured.
u = wLi
Rearrange for L you get:
L=u/wi
And can see that for a given current, voltage across
inductorincreases with L and for the same voltage across inductor:
current decreases with inductance. Which is what you`d expect.
Tesla list wrote:
Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
I recently purchased the Meterman 37XR per the list members
favorable use. I was just measuring the inductance of my variable
ballast, and a few hig power isolation xfmr I have laying around.
One measured 365 mh. When I changed ranges to henrys, it
dramatically changed to 0.260H ! Does anyone else notice this vast
discrepincy? Can I trust the meter?