B&K Precision 875B User Manual [en, es]

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

2.3.1 Zero Adjustment and Capacitance

Measurement

2.3.2 Zero Adjustment and Inductance
Measurement

2.3.3 Resistance 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

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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 ra nges. In ad dition, 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 meters 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.

Inspection

1.1

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, back 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.

Included Items

1.2

Meter Test Leads (1 pair) Battery

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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

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

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

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

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

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

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

(8) Battery Compartment : Access for the battery.
(9) Tilt Stand : Used to hold the instrument at an

(10) Zero Adjust : Control used to zero the display.
(11) Power Switch : Turns power to t he in strument on

connected to the test inputs.

Factor measurement mode.

the desired measurement.

connector for all measurements.

for all measurements.

measurements r equiring t he us e
of te st leads.

measurements requiring the use
of te st leads.

angle on a level surface, or w hen
reversed to han g it from a
projection.

and off.

2

TWO: OPERATION AND MEASUREMENT

Warning

2.1

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 instrument, 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.

Cautions

2.2
(1) To obtain accurate impedance values, perform zero

adjustment before measurements.

(2) Attempted measurement of charged capacitors will overload

the instrument.

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

for an ext ended period, da mage 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. Additionally, 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 solvents 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
different conditions than of the manufacturer, the values
might not be identical. This is not
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

test a capacitor under

may

due to meter error, just

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stated on the capacitor.

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

standard capacitor that states test conditions.

875B Zero Adjustments and Impedance Measurements

2.3

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 simply add/subtract the value from the measured
value of a component.

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

modes: parallel and series. The se distinct 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 Ad justment (Cp Mode)

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

range.

(5) Using a small, flat-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.

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(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 A djustment (Cs Mode)

(4) Set the capacitance meter to the 2µF Capacitance range.
(5) Using a small, flat-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

Capacitance & Dissipation Factor Measurements

seven to measure capacitance.

(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 following 3 dig its blanked) is shown (w hich indicates an
over-range reading), move the range switch to the next higher
capacitance. If necess ary
measurement.

(10) To measure the “D issipation Factor” of the capacitor, 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 Series Resistance” 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 frequency). In 20 mf ra nge,
the d issipation fa ctor can be obtained by the formu lary D=

, perform ze ro ad justment b efore

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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, 20m H, 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 inductance 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 plug them into the banana 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 th e meter. If the leads are too short, u se the alligator
clip leads pro vided w ith the instrum ent to connect t o the
inductor.

(7) Read the inductance value in the 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.

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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 t he banana jacks an d 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 th e meter. If the leads are too short, u se the alligator
clip leads pro vided w ith the instrum ent to connect t o the
inductor.

(7) Read the inductance value in the 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 measure 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.

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(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 t he banana jacks an d 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 th e meter. If the leads are too short, u se the alligator
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 tha t 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
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:

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

the dissipation factor of the capacitor (inductor)

Dissipation Factor Equations

(See table 1)

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series mode capacitance of 1250pF.

Cs＝( 1 ＋ D × D ) × Cp
Cs＝( 1 ＋ 0.5 × 0.5 ) × 1000pF
Cs＝1250pF

E.G.2: With a me asurement frequ ency of 1K Hz, a series inductance of

1000uH with a dissipation factor of 0.5 has a series resistance of

3.14 ohms.

Rs＝2 × 3.14 × f × Ls × D
Rs＝2 × 3.14 × 1K × 1m × 0.5

However, a t a ny given mea surement frequency, the d issipation
factor of a component is the same for both parallel equivalent and
series equivalent circuits.
Additionally, the recipro cal of the dissipation fa ctor (1/D) is
equivalent to the quality factor (Q).

THREE: SPECIFICATIONS

3.1

Power Source

Battery Type: 006P 9V battery.

Power Consumption’s: 155mW

NOTE: Specifications and information are subject to
change without notice. Please visit www.bkprecision.com
the most current product information.

Rs＝3.14

for

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