B+K precision 885 Manuale utente

Instruction Manual

Manual de Instrucción

LCR METER

Models 885 & 886

MEDIDOR LCR

Modelos 885 & 886

Contents

1. INTRODUCTION..................................................... 1

1.1. GENERAL ..................................................... 1

1.2. IMPEDANCE PARAMETERS ..................... 3

1.3. SPECIFICATION ........................................... 6

1.4. ACCESSORIES ........................................... 20

2. OPERATION........................................................... 21

2.1. PHYSICAL DESCRIPTION ....................... 21

2.2. MAKING MEASUREMENT ...................... 22

2.2.1. Battery Replacement..........................22

2.2.2. Battery Recharging/AC operation.....23

2.2.3. Open and Short Calibration..............24

2.2.4. Display Speed....................................25

2.2.5. Relative Mode....................................25

2.2.6. Range Hold........................................25

2.2.7. DC Resistance Measurement.............26

2.2.8. AC Impedance Measurement.............26

2.2.9. Capacitance Measurement................26

2.2.10

Inductance Measurement.............27

2.3. ACCESSORY OPERATION ....................... 28

3. INFRARED OPERAION........................................ 30

3.1. COMMAND SYNTAX................................ 31

3.2. COMMANDS............................................... 32

4. APLICATION ......................................................... 40

4.1. TEST LEADS CONNECTION ................... 40

4.2. OPEN/SHORT COMPENSATION.............. 45

5. LIMITED ONE-YEAR WARRANTY ................... 47

6. SAFETY PRECAUTION........................................ 52

SPANISH MANUAL .............................................. 53

1. Introduction

1.1 General

The B&K Precision Models 885 & 886 Synthesized In-Circuit

LCR/ESR Meter is a high accuracy hand held portable test

instrument used for measuring inductors, capacitors and resistors

with a basic accuracy of 0.5%. It is the most advanced handheld

AC/DC impedance measurement instrument to date. The 885 or 886

can help engineers and students to understand the characteristic of

electronics components as well as being an essential tool on any

service bench.

The instrument is auto or manual ranging. Test frequencies of

100Hz, 120Hz, 1KHz 10KHz or 100KHz (886) may be selected on

all applicable ranges. The test voltages of 50mVrms, 0.25Vrms,

1Vrms or 1VDC (DCR only) may also be selected on all applicable

ranges. The dual display feature permits simultaneous

measurements.

Components can be measured in the series or parallel mode as

desired; the more standard method is automatically selected first but

can be overridden.

The Model 885 and 886 offers three useful modes for sorting

components.

The highly versatile Models can perform virtually all the functions

of most bench type LCR bridges. With a basic accuracy of 0.2%,

this economical LCR meter may be adequately substituted for a

more expensive LCR bridge in many situations. The meter is

powered from two AA Batteries and is supplied with an AC to DC

charging adapter and two AA Ni-Mh Rechargeable Batteries.

The instrument has applications in electronic engineering labs,

production facilities, service shops, and schools. It can be used to

check ESR values of capacitors, sort values, select precision values,

measure unmarked and unknown inductors, capacitors or resistors,

and to measure capacitance, inductance, or resistance of cables,

switches, circuit board foils, etc.

The key features are as following:

Test condition:

Frequency : 100Hz / 120Hz / 1KHz / 10KHz /

100KHz (886)

Level : 1Vrms / 0.25Vrms / 50mVrms /

1VDC (DCR only)

Measurement Parameters : Z, Ls, Lp, Cs, Cp, DCR,

ESR, D, Q and

Basic Accuracy: 0.2%

Dual Liquid Crystal Display

Fast/Slow Measurement

Auto Range or Range Hold

Infrared Interface Communication

Open/Short Calibration

Primary Parameters Display:

Z : AC Impedance

DCR : DC Resistance

Ls : Serial Inductance

Lp : Parallel Inductance

Cs : Serial Capacitance

Cp : Parallel Capacitance

Second Parameter Display:

: Phase Angle

ESR : Equivalence Serial Resistance

D : Dissipation Factor

Q : Quality Factor

Combinations of Display:

Serial Mode :Z –

, Cs – D, Cs – Q, Cs – ESR, Ls –

D, Ls – Q, Ls – ESR

Parallel Mode :Cp – D, Cp – Q, Lp – D, Lp – Q

1.2 Impedance Parameters

Due to the different testing signals on the impedance measurement

instrument, there are DC impedance and AC impedance. The

common digital multi-meter can only measure the DC impedance,

but the Model 885 can do both. It is a very important issue to

understand the impedance parameters of the electronic component.

When we analysis the impedance by the impedance measurement

plane (Figure 1.1). It can be visualized by the real element on the

X-axis and the imaginary element on the y-axis. This impedance

measurement plane can also be seen as the polar coordinates. The Z

is the magnitude and the

is the phase of the impedance.

(

)

sX,RZ

Real Axis

Imaginary Axis

Figure 1.1

(

)

()

Ohm

Reactance

Resistance

Impedance

=Ω

⎟

⎠

⎞

⎜

⎝

⎛

+==

Ω∠=+=

−

sss

TanSinZX

XRZCosZR

ZjXRZ

θθ

There are two different types of reactance: Inductive (X

) and

Capacitive (X

). It can be defined as follows:

= Inductance (H)

C = Capacitance (F)

= Frequency (Hz)

fCC

fLLX

πω

Also, there are quality factor (Q) and the dissipation factor (D) that

need to be discussed. For component, the quality factor serves as a

measure of the reactance purity. In the real world, there is always

some associated resistance that dissipates power, decreasing the

amount of energy that can be recovered. The quality factor can be

defined as the ratio of the stored energy (reactance) and the

dissipated energy (resistance). Q is generally used for inductors and

D for capacitors.

sss

BRCR

===

tan

There are two types of the circuit mode. One is series mode, the

other is parallel mode. See Figure 1.2 to find out the relation of the

series and parallel mode.

Real and imaginary components are serial

jXRZ +

Real and imaginary components are Parallel

G=1/R

B=1/jX

jBGY +

Y+=

Figure 1.2

1.3 Specification

LCD Display Range:

Parameter Range

Z 0.000

to 9999M

L 0.000µH to 9999H

C 0.000pF to 9999F

DCR 0.000

to 9999M

ESR 0.000

to 9999

D 0.000 to 9999

Q 0.000 to 9999

-180.0

to 180.0

Accuracy (

Z Accuracy:

|Zx|

Freq.

20M ~

10M

(

Ω

)

10M ~

(

Ω

)

1M ~

100K

(

Ω

)

100K ~

(

Ω

)

10 ~ 1

(

Ω

)

1 ~ 0.1

(

Ω

)

DCR

100Hz

120Hz

1KHz

10KHz 5%

0 5%

102%

105%

1 1%

100KHz

(886)

NA 5%

1 0.4%

12%

1 5%

Note : 1.The accuracy applies when the test level is set to 1Vrms.

.Ae

multiplies 1.25 when the test level is set to 250mVrms.

.Ae

multiplies 1.50

when the test level is set to 50mVrms.

4.When measuring L and C, multiply

1Dx+

if the

＞

0.1.

is not specified if the test level is set to 50mV.

C Accuracy :

79 57

159 1

1 591

15 91

159 1

1591

15 91

100Hz

1 0 5%

0 2%

0 5%

66 31

132 6

1 326

13 26

132 6

1326

13 26

120Hz

1 0 5%

0 2%

0 5%

7 957

15 91

159 1

1 591

15 91

159 1

1 591

1KHz

1 0 5%

0 2%

0 5%

0 795

1 591

15 91

159 1

1 591

15 91

159 1

10KHz

1 0 5%

0 2%

0 5%

NA 0 159

1 591

15 91

159 1

1 591

15 91

100KHz

(886)

NA 5%

1 0 4%

1 5%

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