# LCR Meter vs LCR or Bridge

#### Liam1980

Joined Jan 20, 2023
5
what's the difference between LCR Meter vs LCR or Bridge

What is better?

#### KeithWalker

Joined Jul 10, 2017
2,702
If you don't know what the difference is, then I recommend that you look up on the internet what they are and how they work. The information is all there waiting for you. Once you understand what they are, the advantages and disadvantages will become apparent to you.

#### DickCappels

Joined Aug 21, 2008
9,607
If you want to have precise control over the excitation signal, want plenty or resolution, and don't mind fiddling with dials to get to the answer then a manual bridge would give the best performance. I used to use a bridge but found it very slow going and now rely on LCR and L meters.

#### MrChips

Joined Oct 2, 2009
28,095
Bridge measurements refer to a circuit configuration based on the Wheatstone bridge.

In a classic bridge measurement, R1 and R3 in the circuit above are known and fixed resistors. Rx is the unknown resistor.
R2 is adjusted until the galvanometer VG reads zero voltage and current. This meter is usually a very sensitive 50μA moving coil ammeter. The measurement does not depend on the supply voltage. It also does not require the ammeter to be calibrated.

For capacitance and inductance measurements, the DC supply is replaced with an AC source.

An LCR meter might use other forms of AC techniques that measure reactance.

#### KeithWalker

Joined Jul 10, 2017
2,702
what's the difference between LCR Meter vs LCR or Bridge

What is better?
Is this a homework question? If so, we need to see your best effort at a response before we can help.

#### bob2

Joined Jun 15, 2019
219
what's the difference between LCR Meter vs LCR or Bridge
I must say right away that the LCR meter must operate at different frequencies.

#### DickCappels

Joined Aug 21, 2008
9,607
what is an "LCR"?

I have an LR meter that uses a 1 kHz sine wave and looks at the magnitude of the voltage signal across the reactive component by measuring the current over a sampling signal in phase with the 1 kHz current source and then again with a 90° (quarter cycle) delay. This allows calculation of the real (resistive) and imaginary (inductive) induced voltage and from that the resistance and inductance.

There are others that resonate, for example, an unknown L against a known C in an oscillator and use the measured resonant frequency of the combination of the unknown and known reactive components to calculate the value of the unknown reactive component.

And an RF inductance meter that injects fixed frequency pulses into an inductor, and after low pass filtering provides a voltage proportional to the inductance.

#### tautech

Joined Oct 8, 2019
315
what's the difference between LCR Meter vs LCR or Bridge

What is better?
Exactly what are your needs ?
Precise or indicative measurements ?

#### Liam1980

Joined Jan 20, 2023
5
i need a very very Precise measurements

#### MrChips

Joined Oct 2, 2009
28,095
i need a very very Precise measurements
What are you measuring, R, C, or L?
What is the range of values?

For precise measurements, use a bridge method.

Are you doing a one time measurement or are you looking for a lab bench instrument?
What are your requirements for resolution and accuracy?
Do you need NIST traceable certification?

#### Danko

Joined Nov 22, 2017
1,545

#### Liam1980

Joined Jan 20, 2023
5
it is not Homework
i just need to know : what's the difference between LCR Meter vs LCR or Bridge ?
In two or three sentences

#### tautech

Joined Oct 8, 2019
315
it is not Homework
i just need to know : what's the difference between LCR Meter vs LCR or Bridge ?
In two or three sentences
They can all be the same and have just one function, to make L, C and R measurements.
Pick the type that suits your accuracy needs, form factor you require and your budget.

I went through this 20 years ago and selected top quality SMD smart tweezers that have outlasted several DMM's and they are the first tool out when testing/measuring any component.

#### Danko

Joined Nov 22, 2017
1,545
i just need to know : what's the difference between LCR Meter vs LCR or Bridge ?
In two or three sentences
In three sentences:

LCR Meter: it is LCR Meter, method of measuring is not described.
LCR: it is LCR Meter, only name is shorted for convenience, method of measuring is not described.
Bridge: it is LCR Bridge Meter, where "Bridge" describes method of measuring and name is shorted for convenience.

#### KeithWalker

Joined Jul 10, 2017
2,702
it is not Homework
i just need to know : what's the difference between LCR Meter vs LCR or Bridge ?
In two or three sentences