Ver 2.1

12/03/01

2

Introduction

The ES51919/ES51920 chipset is a total solution for high accuracy LCR meter

which could measure Inductance/Capacitance/Resistance with secondary parameters

including dissipation factor(D), quality factor(Q), phase angle(θ), equivalent

series/parallel resistance(ESR or Rp). The chipset is fully auto ranging operation for AC

impedance & DC resistance measurement. Because of high integrated circuit design, a

smart measurement for L/C/R is possible (AUTOLCR mode). It means the user could

measure the L/C/R components directly at AUTOLCR smart mode without changing the

function key. User could also select the target test frequencies of

100Hz/120Hz/1kHz/10kHz/100kHz depending on DUT type. Components could be

measured in series or parallel mode according to the DUT impedance automatically.

The LCR chipset built-in a 4.5 digits ADC operates at 1.2/s updating rate nominally

for L/C/R mode. The chipset operates at 0.5/s updating rate for DCR mode.

The general DMM could measure DC resistance only, but the LCR meter could

measure DC resistance and AC impedance. The impedance consists of resistance (real

part) and reactance (imaginary part). For example, Zs represents the impedance in series

mode. Zs can be defined a combination of resistance Rs and reactance Xs. It also could

be defined as a |Z| of magnitude with a phase angle θ.

Zs = Rs + jXs

| Zs |

Real axis

Imaginary axis

(series mode)

Rs

Xs

θ

θ

> 0

Zs = Rs + jXs

| Zs |

Real axis

Imaginary axis

(series mode)

Rs

Xs

θ

θ

> 0

Zs = Rs + jXs or |Zs|∠θ