All Questions
Tagged with measurement current-measurement
61
questions
0
votes
2
answers
51
views
What does an accuracy of 0.1% + 20 mV mean in a power analyzer's data sheet?
I need to know the measurement accuracy of Keysight N6705C power analyzer. I came across this document (N6700 Modular Power System Family.pdf) that states the error in terms of a percentage plus a ...
- 215
4
votes
3
answers
835
views
Measuring nA leakage current
I'm trying to measure some leakage currents of both a diode (expected around 5 nA) and a MOSFET (20 nA).
My issue is my meter's measurement accuracy is only around 10 uA, and I need an accurate ...
- 41
0
votes
2
answers
75
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Measure transformer real power
I’m new at making transformers myself, and the ones that I designed had the correct output voltage, and when they were connected to batteries (previously rectified), they give me a an approximate of ...
- 111
0
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0
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65
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Uncertainty for measuring a resistor
I am trying to calculate the uncertainty of a measure on a resistor. The expected value of the resistor is 45 mΩ. For measuring the resistor I used the two following instruments:
SM500-CP-90
Agilent ...
- 2,478
1
vote
1
answer
316
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HLW8032 energy meter circuit showing power usage at no load
I am designing an AC energy metering circuit. The circuit has to measure voltage, current, power, power factor and energy used for two channels (from the same source). The HLW8032 transmits 24 bytes ...
- 103
1
vote
2
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148
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AC leakage issue with high impedance measurement setup
I am having an AC leakage current problem with my measurement setup that I typically use for lock-in measurements.
I employ a 100 M\$\Omega\$ resistor as a voltage-current converter, and in series, a ...
- 13
1
vote
2
answers
53
views
Measure power & energy usage in tapped line
Here is the schematic of the circuit in question:
The horizontal lines are from the AC mains. Ammeters and wattmeters are connected at any 2 points in the main lines. I am trying to detect if the ...
- 111
0
votes
2
answers
180
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Current drop with capacitor
I'm new to electronics, and there's something I can't figure out.
Can someone explain to me why, when I add C1, the current drops drastically in R3?
I was thinking that the impedance will be the same ...
- 83
0
votes
1
answer
461
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USB meter does not detect current in very basic USB circuit
I have a USB LED light (for plants) that draws 5 V @ 1.16 A when I plug it in, as measured by my USB volt/amp meter.
EDIT: The problem was caused by the specific USB tester model KWS-MX18L. See answer ...
- 101
1
vote
2
answers
223
views
Why add extra resistance to a shunt?
simulate this circuit – Schematic created using CircuitLab
I'm using a Fluke Y5020 air cooled shunt (it's 10 mΩ, 20 A max) and putting 3 A at 60 Hz into it.
Aside from Ohm's law, is there any ...
- 11
0
votes
0
answers
92
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Type of transformer needed to measure 4-20mA process current?
I occasionally work with 4-20mA process signals and need to read the current value flowing through the wire. I now use a standard Fluke 17B+ and must disconnect the loop and add the meter in series ...
- 2,696
0
votes
1
answer
74
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Large signal current measurements of a loudspeaker
I'm trying to work out a method of measuring electrical current through a loudspeaker load for voltages in excess of +-20 V to be read by an audio interface - I need to scale down both voltage and ...
- 1
0
votes
1
answer
48
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How would I be able to measure the current using this setup?
What ways can I measure the current as test points on a circuit?
Would I need to add a zero ohm resistor and solder the resistor for normal operation and desolder the resistor and then place my ...
- 45
6
votes
1
answer
358
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Transformer different resulting current and voltage than expected
I am uncertain why the current on the secondary side does not follow the equation:
$$i_2 = \frac{N_1}{N_2} i_1$$
which gives
$$i_2 = \frac{20}{3} i_1$$
To measure the current I use two 1 ohm resistors ...
- 63
0
votes
0
answers
41
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Current Sensing IC (MAX9929F) Query
I am using a MAX9929F Current sensing IC and I have a question to someone to may have used it before, or may have some experience with these types of circuits.
The circuit I built around the IC is the ...
