Skip to main content
Electrical Engineering

Return to Question

deleted 13 characters in body
Source Link
KMM
KMM
  • 419
  • 1
  • 5
  • 15

Good day,

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 is 22µF ±20% 6.3V X5R 0603 (1608 Metric).

Tolerance limits are from 17.6 µF to 26.4 µF.

According to specification test methods are:

The capacitance/D.F. should be measured at a frequency of 1±0.2kHz and a voltage of AC1±0.2V(r.m.s.). (Test Methods).

When I set up output voltage level on SmartTweezers:

  • 0.45 Vrms -- capacitance 17.14µF (out of tolerance limits)
  • when 0.9 Vrms -- capacitance 18.17µF

Why we have so difference? Maybe there is some formula which represents depending on: test measurement voltage VS capacitance?

Good day,

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 is 22µF ±20% 6.3V X5R 0603 (1608 Metric).

Tolerance limits are from 17.6 µF to 26.4 µF.

According to specification test methods are:

The capacitance/D.F. should be measured at a frequency of 1±0.2kHz and a voltage of AC1±0.2V(r.m.s.). (Test Methods).

When I set up output voltage level on SmartTweezers:

  • 0.45 Vrms -- capacitance 17.14µF (out of tolerance limits)
  • when 0.9 Vrms -- capacitance 18.17µF

Why we have so difference? Maybe there is some formula which represents depending on: test measurement voltage VS capacitance?

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 is 22µF ±20% 6.3V X5R 0603 (1608 Metric).

Tolerance limits are from 17.6 µF to 26.4 µF.

According to specification test methods are:

The capacitance/D.F. should be measured at a frequency of 1±0.2kHz and a voltage of AC1±0.2V(r.m.s.). (Test Methods).

When I set up output voltage level on SmartTweezers:

  • 0.45 Vrms -- capacitance 17.14µF (out of tolerance limits)
  • when 0.9 Vrms -- capacitance 18.17µF

Why we have so difference? Maybe there is some formula which represents depending on: test measurement voltage VS capacitance?

edited title
Link
JRE
JRE
  • 72.5k
  • 10
  • 110
  • 193

Why isdoes the capacitance of ceramic capacitors change with test measurement voltage change?

Source Link
KMM
KMM
  • 419
  • 1
  • 5
  • 15

Why is capacitance of ceramic capacitors change with test measurement voltage change?

Good day,

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 is 22µF ±20% 6.3V X5R 0603 (1608 Metric).

Tolerance limits are from 17.6 µF to 26.4 µF.

According to specification test methods are:

The capacitance/D.F. should be measured at a frequency of 1±0.2kHz and a voltage of AC1±0.2V(r.m.s.). (Test Methods).

When I set up output voltage level on SmartTweezers:

  • 0.45 Vrms -- capacitance 17.14µF (out of tolerance limits)
  • when 0.9 Vrms -- capacitance 18.17µF

Why we have so difference? Maybe there is some formula which represents depending on: test measurement voltage VS capacitance?