B+K precision 875B Manuale utente

Instruction Manual

MANUAL DE INSTRUCCIÓNES

Model 875B Digital LCR Meter

Medidor Digital LCR Modelo 875B

TABLE OF CONTENTS

ONE: INTRODUCTION

1.1 Inspection

1.2 Included Items

1.3 Unit Descriptions

TWO: OPTERATION AND MEASUREMENT

2.1 Warning

2.2 Cautions

2.3 875B Zero Adjustment and

Impedance Measurement

2.3.1Zero Adjustment and Capacitance

Measurement

2.3.2 Zero Adjustment and Inductance

Measurement

2.3.3Resistance Measurement

2.4 Measurement Parameter Conversions

THREE: SPECIFICATIONS

3.1 Power Source

3.2 Instrument Specifications

3.3 General Specifications

FOUR: USEER MAINTENANCE

4.1 Battery Replacement

4.2 In Case of Difficulties

FIVE: SERVICE INFORMATION

SPANISH MANUAL

ONE: INTRODUCTION

Congratulations! You ha ve just pur chased some of t he mo st

advanced hand-held digital LCR meter available. This meter is

sure to provide years of reliable service.

The 875B is designed to m easure the param eters of an

impedance e lement w ith high accuracy and speed.

Measurements o f inductance, capacita nce, resistance

(equivalent series resistance) and dissipation factor are provided

for over a broad band of ranges. In addition, you’ll find that it is

ideal for testing SMD ty pe compon ents. P lus, the instrument

offers advanced features, such as the ability to perform precision

measurements of very low resistan ces w ith t he 2 o hm and

20ohm r anges, and id eal for mea suring indu ctances w ith the

200μH t o 200H ranges, a long w ith the un ique drop- proof

construction, comb ine to make the unit the most versatile

handheld LCR meter available today.

With proper care a nd use , the se m eters can pro vide y ears of

reliable op eration. Therefore, it is very important t o com pletely

familiarize yourself with the instrument before attempted use.

Please read this manual carefully, paying particular attention to

the safety section.

1.1 Inspection

When y ou unpa ck y our new Meter from it s or iginal p ackaging,

carefully check each item for damage that may have occurred in

shipment. I f any thing is d amaged or missin g, t ake the ent ire

instrument, including the box and pa cking mat erials, ba ck to the

distributor from w hom it w as pur chased, w here t hey w ill e ither

replace the missing or damaged item or the entire instrument.

1.2 Included Items

Meter Test Leads (1 pair) Battery

1.3 Unit Description

Please use the dr awings of the 87 5B, in co njunction with the

following descriptions of the con trols and co nnections to help

familiarize you with the unit:

(1) Liquid Crystal Display : Indicates the value of capacitance

connected to the test inputs.

(2) LCR/D Mode Switch : Selects either LCR or Dissipation

Factor measurement mode.

(3) Function/Range Switch : Selects the function and ra nge for

the desired measurement.

(4) Common Terminal Slot : The ne gative ( common) te st

connector for all measurements.

(5) Positive Terminal Slot : The positive (high) test connector

for all measurements.

(6) Common Terminal Jack : The negative (low) banana jack for

measurements r equiring t he us e

of te st leads.

(7) Positive Terminal Jack : The positive (high) banana jack for

measurements requiring the use

of te st leads.

(8) Battery Compartment : Access for the battery.

(9) Tilt Stand : Used to hold the instrument at an

angle o n a level su rface, or w hen

reversed to han g it from a

projection.

(10) Zero Adjust : Control used to zero the display.

(11) Power Switch : Turns pow er to t he in strument on

and off.

TWO: OPERATION AND MEASUREMENT

2.1 Warning

Electricity can cause severe injur ies or even d eath, sometimes

even with relatively low voltages or currents.

Therefore it is vitally important that any electronic instruments such

as these meters be totally understood before use.

Please do not use this instrume nt, or any other piece of electrical

or electr onic test e quipment, w ithout f irst th oroughly familiarizin g

yourself with its correct operation and use.

2.2 Cautions

(1) To obtain accurate impedance values, perform zero

adjustment before measurements.

(2) Attempted measurement o f ch arged capacitors w ill o verload

the instrument.

(3) If a dead or partially discharged battery is left in the instrument

for an extended period, damage to the unit could result from

battery lea kage. Therefore it is important t o rep lace a

discharged battery prompt ly. Ple ase dispo se o f the u sed

battery in a proper manner. Ad ditionally, if t he instrument will

not be u sed for an extend ed p eriod, a lways remove the

battery from the unit and store it separately.

(4) Do not use so lvents or aromatic hy drocarbons to cle an the

instrument, or the plastic case may be damaged. If cleaning is

necessary, use only a mild solution of warm water and soap.

(5) Capacitors are manufactured to operate under certain

conditions. Since the meter may test a capacitor under

different conditions than of the manufacturer, the values

might not be identical. This is not due to meter error, just

the method of test. Therefore, if this is the case, check

the capacitor’s dissipation factor (≦0.1) and whether the

test was conducted in series or parallel mode (ref.

Section 3.6). Use the equations to convert between the

modes. At this point, one should obtain a value to that

stated on the capacitor.

(6) To ascertain if the meter is accurate, please use a

standard capacitor that states test conditions.

2.3 875B Zero Adjustments and Impedance Measurements

IMPORTANT INFORMATION:

1. As an added feature, the 875B has +/- offsets. The +/-offsets

allow for measurements when the LCD is not at zero. The +/-

offsets are applicable to components that are measured in the

following mode s: capacitor para llel (C p), in ductor series (Ls)

and resistance series (Rs). The +/- o ffsets are no t applicable

for components th at are te sted C s, Lp or Rp. To u se th is

feature, just sim ply add/subtract the value from the measured

value of a component.

2. For imp edance measurements there are tw o d ifferent test

modes: para llel an d ser ies. The se d istinct t est modes ob tain

different results. Refer to section 2.4 for conversions.

2.3.1 Zero Adjustment and Capacitance Measurement

(1) Set the power switch to the “on” position.

(2) Set the mode switch to the “LCR” position.

(3) Set the Function/Range switch to the appropriate capacitance

range for the capacitor under test. If the capacitance value is

unknown, select the 200pF range.

NOTE: If test leads will be used in the measurement, have them

plugged in the banana jacks, but not connected.

200pF, 2nF, 20nF, 200nF & 2µF Range (Cp):

Zero Adjustment (Cp Mode)

(4) Set the Capacitance meter to the se lected Capacitance

range.

(5) Using a small, f lat-blade screwdriver, slowly turn the “0 Adj”

control to calibrate the display for a zero re ading. Now the

meter is calibrated for these four ranges.

(6) Set the m eter to p roper capacitance range and go to step

seven to measure capacitance.

20µF, 200µF, 2mF & 20mF (Cs): Range

Zero Adjustment (Cs Mode)

(4) Set the capacitance meter to the 2µF Capacitance range.

(5) Using a small, f lat-blade screwdriver, slowly turn the “0 Adj”

control to calibrate the display for a zero re ading. Now the

meter is calibrated for these four ranges.

(6) Set the meter to p roper capacitance range a nd g o to step

seven to measure capacitance.

Capacitance & Dissipation Factor Measurements

(7) Discharge the capacitor to be measured.

(8) Insert the capacitor leads into the component test sockets at

the front of the meter. If the capacitor leads are too short, use

the alligator clip leads provided with the instrument to connect

to the capacitor. Be sure to o bserve the proper po larity if t he

capacitor is a polarized type.

(9) Read the capacitance value in the d isplay. If “1---“(a one w ith

the fo llowing 3 dig its blanked) is sh own (w hich indicates an

over-range reading), move the range switch to the next higher

capacitance. If necess ary, perform ze ro ad justment b efore

measurement.

(10) To measure the “D issipation Factor” of the capa citor, set the

mode switch to th e “D” po sition, a nd read t he d issipation

factor value in the display.

(11) ESR Fur capacitors

“Equivalent Ser ies Resistan ce” is ty pically much larger than

the actual “ohmic” series resistance of the wire leads and foils

that ar e phy sically in series w ith the heart of a ca pacitor,

because ESR includes also the effect of dielectric loss. SR is

related to D by the formu la E SR=Rs=D/wCs (w here w

represents “ome ga” =2 p i times freq uency). In 20 mf ra nge,

the d issipation fa ctor can be obtained by the formu lary D=

WCsRs w here C s in th e mea sured va lue and R s is

measured by 2Ω r ange.

NOTE: To avoid possible damage to the instrument, discharge all

capacitors before attemp ting to measure the va lue or

dissipation factor.

2.3.2 Zero Adjustment and Inductance Measurements

200µH, 2mH, 20mH, 200mH range (Ls):

Zero Adjustment & Measurements

(1) Set the power switch to the “on” position.

(2) Set the mode switch to the “LCR” position.

(3) Set the Function/Range switch to the appropriate range for the

inductor under test. If the indu ctance value is unknown, select

the 200µH range.

NOTE: Each range must have zero adjustment performed.

(4) Using a short piece of w ire, such as a paper clip, temporarily

connect the po sitive and nega tive m easurement terminals

together. A lternatively, if t he clip leads w ill b e u sed for the

measurement p lug the m into the ban ana jacks and connect

the clips together.

(5) Use a small, flat-blade screwdriver and slowly turn the “ 0 Adj”

control to calibrate the display for a zero reading. Remove the

calibration short.

(6) Insert the inductor leads into the component test sockets at the

front of the meter. If the leads are too short, use t he a lligator

clip leads pro vided w ith the instrum ent to connect t o the

inductor.

(7) Read the inductance value in t he display. If “ 1---“ (a one with

the fo llowing 3 d igits b lanked) is shown, move the ra nge

switch to the next higher range until the over range indication is

gone from the display. Repeat steps 4-7.

2H, 20H, 200H,range (Lp): Zero Adjustment & Measurements

(1) Set the power switch to “on” position.

(2) Set the mode switch to the “LCR” position.

NOTE: These three ranges (Lp mode) must be zero calibrated at

200mH range.

(3) Set the Function/Range switch to the 200mH range.

(4) Using a short piece of w ire, such as a paper clip, temporarily

connect the po sitive and nega tive m easurement terminals

together. A lternatively, if t he clip leads w ill b e u sed for the

measurement, plug them into the banana jacks and connect

the clip together.

(5) Use a small, flat-blade screwdriver and slowly turn the “ 0 Adj”

control to calibrate the display for a zero reading. Remove the

calibration short.

(6) Insert the inductor leads into the component test sockets at the

front of the meter. If the leads are too short, use t he a lligator

clip leads pro vided w ith the instrum ent to connect t o the

inductor.

(7) Read the inductance value in t he display. If “ 1---“ (a one with

the fo llowing 3 d igits b lanked) is shown, move the ra nge

switch to the next higher range until the over range indication is

gone from the display and a value is obtained.

(8) To mea sure the “ Dissipation Fa ctor” of th e inductor, set the

mode switch to the “D” position, and read the dissipation factor

value in the display.

2.3.3 Resistance Measurements

NOTE: A. The 2, 20, 200, 2K, 20K, 200K, ohm ranges of resistance

needs to be zero adjusted separately.

B. It can not be zero adjusted at 2M and 20M range. There

is always a reading about .120-.140 when input

terminals are shorted to zero adjust,set the range

switch to 200K range and zero adjust.

(1) Turn unit on.

(2) Set the mode switch to the “LCR” position.

(3) Set the Fun ction/Range switch to the appro priate resista nce

range. If the value of resistance is unknown, select the 2 ohm

range.

(4) Using a short piece of w ire, such as a paper clip, temporarily

connect the po sitive and nega tive m easurement terminals

together. A lternatively, if t he clip leads w ill b e u sed for the

measurement, plug them into the banana jacks and connect

the clips together.

(5) Use a small, flat-blade screwdriver and slowly turn the “O A dj”

control to calibrate the display for a zero reading. Remove the

calibration short.

(7) Insert the resistor leads into the component test sockets at the

front of the meter. If the leads are too short, use t he a lligator

clip leads provided with the instrument to connect to resistor.

2.4 Measurement Parameter Conversions

The paramet er va lue for a co mponent mea sured in a parallel

equivalent circuit and that value me asured in a series equivalent

circuit may be diff erent fro m ea ch o ther. Th is means t hat the

parallel-measured capacitance (inductance) of any given capacitor

(inductor) w ill no t b e equa l t o the ser ies-measured capacitance

(inductance) unless the dissipation factor of the capacitor (inductor)

equals zero. The equat ions in t he tab le be low sh ow the

relationship be tween the para llel- a nd the serie s- m easured

parameters of any given components:

Dissipation Factor Equations

(See table 1)

E.G.1: With a m easurement fre quency of 1KH z, a para llel mo de

capacitance of 1000pF with a dissipation factor of 0.5 is equal to a

Indice

Lingue:

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