LCR Meter vs Multimeter: Inductance, Capacitance, ESR
Quick answer: a multimeter's capacitance range times how long a capacitor takes to charge, which is fine for checking a value or sorting parts, but it tells you nothing about losses and most multimeters cannot measure inductance at all. A full LCR meter (an impedance bridge) drives the part with an AC test signal at a chosen frequency and measures its impedance, so it handles inductors, transformers and small capacitors and adds ESR, D and Q. Basic handheld L/C/R meters sit in between: they measure inductance, but not losses. If you only sort capacitors, a dedicated capacitance meter sits between the two.
Both tools can show a value in µF, but they answer different questions. Below is how each one works, where each is the right tool, and which of our handheld LCR and capacitance meters fits which job, including what they do not do.
How a multimeter measures capacitance
A typical digital multimeter charges the capacitor with a known current and measures the time the voltage takes to reach a threshold. Capacitance follows from the charge rate. It is close to a DC measurement: there is no test frequency you can choose, and the meter sees only the stored charge.
That method has three consequences you should know about:
- Leakage current diverts part of the charging current, slowing the voltage rise, so leaky capacitors typically read artificially high, with no warning.
- Large values are slow. On a multi-millifarad range the reading can take several seconds to settle.
- There is no loss information. A capacitor whose ESR has risen can still read close to nominal.
Most multimeters also have no inductance function. A few do: the VC4060B+ insulation multimeter has inductance ranges from 6mH to 100H at ±(1.5%+5), which is aimed at motor and winding checks rather than component work.
How an LCR meter measures
The name covers two kinds of instrument. A full LCR meter, sometimes called an LCR bridge, applies an AC test signal at a selectable frequency and measures the complex impedance of the part, both magnitude and phase. From that it derives inductance (L), capacitance (C) and resistance (R), plus secondary parameters: the dissipation factor D, the quality factor Q (D = 1/Q) and ESR, with a choice of series or parallel equivalent circuit. These exist as bench instruments and as higher-end handhelds.
A basic handheld L/C/R meter, like our rotary-dial DM4070, measures L, C and resistance on separate dial positions. It fills the inductance gap a multimeter leaves, but it does not report losses or let you set the frequency.
Because the measurement is made at a frequency, L, C and ESR all depend on that frequency. A value without its test frequency is incomplete. Electrolytic capacitors are usually specified at 120 Hz (or 100 Hz), while ESR of switching-supply capacitors is often specified at 100 kHz.
LCR meter vs multimeter, side by side
| Point | Multimeter (capacitance range) | Full LCR meter (bridge type) |
|---|---|---|
| Test method | Charge with known current, time it | AC test signal, measure impedance |
| Test frequency | None to choose | Set frequency; report it with the value |
| Inductance | Usually not available | Yes |
| Small capacitance (pF) | Limited; lowest full-scale range often tens of nF | Better suited, depending on model |
| ESR, D, Q | No | On models that list them |
| Series/parallel model | Not applicable | Selectable |
| Other functions | Voltage, current, resistance, frequency and more | Components only, de-energized |
| Best for | Quick value checks in the field | Inductors, transformers, matching, incoming inspection |
When a multimeter's capacitance range is enough
For many maintenance jobs, the multimeter you already carry is the right tool. Use it when you want to know whether a part is roughly its marked value:
- Checking a motor start or run capacitor that has been disconnected and discharged.
- Confirming a capacitor is not open or shorted.
- Rough sorting of loose parts from a parts bin.
The VC99 covers 60nF to 60mF at ±(2.5%+6), and the VC89 covers 60nF to 60mF at ±(2.5%+5). Read the accuracy in context. Say you measure a 1 µF film capacitor on the VC99's 6µF range, where one count is 0.001 µF: the allowance is 2.5% of 1.000 plus 6 counts, about ±0.031 µF. That is fine for "good or bad", not for matching. Our guide to the instrument error formula walks through this calculation.
When you need an LCR meter
- Inductors, chokes and transformer windings. A multimeter's resistance range shows only copper resistance, not inductance or shorted turns.
- Small capacitance. Picofarad parts, cable capacitance and PCB circuit capacitance sit below most multimeter ranges.
- Matching and tolerance sorting. Pairs of capacitors or inductors in filters and crossovers need tighter accuracy than a multimeter gives.
- Incoming inspection. Checking a reel or a batch against the datasheet calls for repeatable values and a known method.
- ESR of electrolytics. High ESR is a common failure in power supplies even when capacitance still reads close to nominal.
Be clear about which of these our handhelds cover. The DM4070 and VC6243+ are rated ±(2.0%+5) on a 2000-count display. That is no tighter than the capacitance range of a 6000-count multimeter, so use them for what a multimeter cannot do: measuring inductors and coils, checking values, and comparing parts against each other. Their specifications list no ESR, D, Q, selectable test frequency or equivalent-circuit setting.
For tight capacitor sorting, use a dedicated capacitance meter (below). For tight inductance grading, incoming inspection against frequency-specific datasheet limits, or ESR at 100 kHz on switching-supply capacitors, you need a full LCR meter, bench or handheld, that specifies those functions, or for ESR alone, a dedicated ESR meter. An ESR meter suits fast go/no-go checks.
Dedicated capacitance meters: the middle ground
If your work is mostly capacitors, a capacitance-only meter gives tighter accuracy than either a multimeter or a general LCR handheld. The VC6013 has nine ranges from 200pF to 20mF full scale, at ±(0.5%+1). Take the same hypothetical 1 µF part on its 2µF range: 0.5% of 1.000 plus 1 count is about ±0.006 µF, roughly five times tighter than the VC99 example above. The VC6013A keeps that accuracy and extends the top range to 200mF.
Series vs parallel, and test frequency
An LCR meter models the part as an ideal L or C plus a resistance, either in series or in parallel. The two models give different numbers for the same part, and the right one depends on the impedance at the test frequency:
- Low impedance, below about 100 Ω (large capacitors, small inductors): use the series model.
- High impedance, above about 10 kΩ (small capacitors, large inductors): use the parallel model.
- In between: follow the component maker's specification.
Match the test frequency to the datasheet too: 120 Hz or 100 Hz for electrolytic capacitance, the stated frequency for inductors. These choices apply to meters that offer them, bench or handheld; our handheld models below do not list a frequency or model setting, so compare their readings with each other rather than directly with a datasheet figure taken at a different frequency.
Choosing a model
| Model | Measures | Full-scale ranges and accuracy | Choose it for |
|---|---|---|---|
| VC6013 | C | 200pF to 20mF, ±(0.5%+1) | Precision capacitor sorting |
| VC6013A | C | 200pF to 200mF, ±(0.5%+1) | Same, plus very large capacitors |
| VC6243+ | C, L | C 2nF to 2000µF; L 2mH to 20H; ±(2.0%+5) | General capacitor and inductor checks |
| DM4070 | L, C, R | L 200µH to 20H, C 200pF to 2000µF, both ±(2.0%+5); R 20Ω to 20MΩ, ±(0.8%+2) | One meter for small coils, capacitors and low resistance |
Range figures are full scale, lowest to highest; the lowest range also reads values below its name (the 200pF range reads up to 199.9 pF). All four are 2000-count, manual-range handhelds with automatic capacitor discharge protection. Pick the VC6013 or VC6013A when capacitor tolerance matters most. Pick the VC6243+ if a lowest inductance range of 2mH full scale is enough, and the DM4070 if you need the finer 200µH range or resistance on the same dial. For motor windings, where inductance balance between phases is one check among several, see how to test motor windings.
Practical tips for accurate readings
- Disconnect and discharge first. Always discharge capacitors before connecting any meter. Our component meters have built-in discharge protection, but it only guards the meter against small residual charges. It will not survive a charged high-voltage or high-energy capacitor, and it never protects you. Large or high-voltage capacitors can hold a dangerous charge; discharge them through a suitable resistor and confirm zero volts with a voltmeter.
- Measure out of circuit. Parallel paths on a board change both capacitance and inductance readings.
- Keep leads short. Long leads add their own capacitance and inductance, which matters most on the pF and µH ranges.
- Use the lowest range that does not overrange. On a 2000-count meter that gives you the most resolution.
- Note the frequency and equivalent model on any full LCR meter measurement you report.