5
votes
How to test a femto ammeter?
The easiest way is just to pull your your credit card and buy an electrometer instrument that is calibrated and will source or measure what you need. Maybe in the $10k-20k range new, if you can find ...
3
votes
How to test a femto ammeter?
At these currents, a small capacitor, ideally PTFE or polystyrene, fed with a known rate of ramp, makes a very good source.
I = CdV/dt
To get a known, constant, rate of ramp, use an integrator fed ...
- 171k
2
votes
How to test a femto ammeter?
I = V / R
Get a voltage source and a resistor that are accurate enough for your test.
Connect them so they run current through your meter. If your meter has input resistance, then make sure to factor ...
- 12.4k
2
votes
Uneven current sharing between four parallel cables
A standard solution for this (and I seriously wonder why it wasn't designed that way in the first place, or suggested by the induction heater manufacturer, etc.) is to use kickless cables. Example ...
- 43.7k
2
votes
Uneven current sharing between four parallel cables
You are probably running in to proximity effects, that is, adjacent conductors will cause an uneven current density within the cross section of the conductor. "Soft Ferrites", by E.C. ...
- 10.5k
1
vote
Accepted
How to determine the power rating of transformer
For power transformers, the most common limiting factor for a transformer's power transfer capability is the heat generated by losses in the transformer, and the subsequent rise in temperature of the ...
- 26.2k
1
vote
How to test a femto ammeter?
I had 1E9 and 1E10 resistors mounted in a box, BNC female on one side BNC male on the other. I think they were 1%, from Vishay, glass housing. Connect known voltage source one side, measured with DVM, ...
- 1,116
1
vote
What value does ammeter or voltmeter measures (RMS, Average or Peak )?
The other answers are excellent, but do not answer the question, and explain off-topic issues like the properties of "most" signals.
First, you asked about "these meters" without ...
- 894
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