All Questions
Tagged with measurement capacitor
38
questions
1
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0
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Comparison of two methods used to calculate capacitance
I need to compare two potential methods used to calculate capacitance, but I can't find the names for them to do some research.
The first method: Placing a capacitor in a circuit with an 800 Hz ...
0
votes
1
answer
85
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Capacitor test mode in ICT
My ICT machine has two capacitor measurement modes on the PCB:
Mode 1: Use DC source test method (Figure 1)
Mode 2: Use AC source test method (Figure 2)
Could anyone please help me with the ...
12
votes
6
answers
6k
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Why can't capacitors on PCBs be measured with a multimeter?
While looking at this article, it mentioned that one cannot test the capacitance of a capacitor while it is on a PCB. The explanation given is:
The reason is, that when a capacitor is inside the ...
- 913
9
votes
1
answer
340
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Why does the measured capacitance value of some ceramic capacitors keeps on increasing?
The capacitance of two ceramic capacitors were measured using an LCR meter (Agilent E4980A) at 1 kHz. The measured capacitance values of 100 pF and 100 nF capacitors are shown below.
The value of 100 ...
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0
votes
1
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204
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How does the FDC1004 (capacitance to digital converter) measure capacitance?
I am using the FDC1004 and wondering how it exactly measures capacitance. The datasheet is not explaining much. An associated application note contains a little more information, but still very little ...
- 285
0
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1
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50
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Testing for connection using capacitors
I work in a common mode choke coil manufacturing company. They often measure the insulation resistance as well as the connectivity of the coils. I have a good understanding of how insulation ...
0
votes
0
answers
157
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PCap04 initialisation sequence
I'm developing SPI interface with a very complex and badly documented PCap04 device. I've already implemented and tested all commands, but the results are always very unstable. Even the charging/...
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-2
votes
1
answer
118
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Voltage across capacitor measured in parallel, why not showing Vc?
I am trying to understand something and missing something. In a low pass RC filter, the output is connected in parallel with the capacitor, right, and is phase shifted, because the current in a RC ...
- 69
2
votes
1
answer
349
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How to measure capacitor value using an LC circuit?
How would I measure the value of capacitor using an inductor of unknown value but with a function generator producing a sine wave of 1MHz?
I have an oscilloscope handy.
I lost the labelling on the ...
- 45
0
votes
2
answers
115
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How do I calculate the capacity of a capacitor using measurements of an experiment?
I build this circuit in an experiment
During the experiment I got these readings:
...
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-1
votes
1
answer
115
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Custom Test Fixture for LCR meter
I've designed and built a custom test fixture (based on Keysight's 16047A) to be able to measure multiple pin capacitors.
When testing it to compare both fixtures (the custom and the original), I ...
7
votes
3
answers
13k
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How do digital multimeters measure capacitance?
How do digital mulitimeters (DMM) measure capacitance through their typical 10M Ohm input/output impedance?
Providing a logic level of 3.3V, attempting to measure 1F would mean a time constant of ...
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0
votes
2
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394
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Measuring 0805 Capacitor values under 1nF
Other than investing in an expensive tweezer type meter for SMD components, what would be a good method for the layman to find the capacitance of an 0805 ceramic capacitor whose value is below 1nF? My ...
- 89
0
votes
3
answers
663
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Why does the capacitance of ceramic capacitors change with test measurement voltage change?
I faced a problem of measuring capacity in ceramic capacitors.
Measurements did with Smart Tweezers ST5S. It has two output voltage levels that can be selected: 0.45 Vrms and 0.9 Vrms.
The capacitor ...
- 419
8
votes
3
answers
4k
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Measuring resistance of a capacitor - unexpected results
I'm trying to measure the impedance (\$R_x\$) of C1 in the RC circuit shown below, but I'm getting some results I can't explain.
simulate this circuit – Schematic created using CircuitLab
...
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