B+K precision 885 User manual

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
1

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:
z Test condition:
1
Frequency : 100Hz / 120Hz / 1KHz / 10KHz /
100KHz (886)
2.
Level : 1Vrms / 0.25Vrms / 50mVrms /
1VDC (DCR only)
z Measurement Parameters : Z, Ls, Lp, Cs, Cp, DCR,
ESR, D, Q and
θ
z Basic Accuracy: 0.2%
z Dual Liquid Crystal Display
z Fast/Slow Measurement
z Auto Range or Range Hold
z Infrared Interface Communication
z Open/Short Calibration
z Primary Parameters Display:
Z : AC Impedance
DCR : DC Resistance
Ls : Serial Inductance
2

Lp : Parallel Inductance
Cs : Serial Capacitance
Cp : Parallel Capacitance
z Second Parameter Display:
θ : Phase Angle
ESR : Equivalence Serial Resistance
D : Dissipation Factor
Q : Quality Factor
z Combinations of Display:
Serial Mode :Z –
θ , 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
θ is the phase of the impedance.
3

s
X
s
R
(
)
sX,RZ
s
Z
θ
Real Axis
Imaginary Axis
Figure 1.1
(
)
()
()
()
()
Ohm
Reactance
Resistance
Impedance
1
22
=Ω
=
=
=
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
==
+==
Ω∠=+=
−
S
S
s
s
s
sss
ss
X
R
Z
R
X
TanSinZX
XRZCosZR
ZjXRZ
θθ
θ
θ
There are two different types of reactance: Inductive (X
L
) and
Capacitive (X
C
). It can be defined as follows:
L
= Inductance (H)
C = Capacitance (F)
f
= Frequency (Hz)
fCC
X
fLLX
C
L
πω
π
ω
2
11
2
==
==
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
4

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.
pp
p
p
p
p
sss
s
s
s
RC
L
R
X
R
G
BRCR
L
R
X
D
Q
ω
ω
ω
ω
δ
===
=
===
==
1
tan
11
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.
5

Real and imaginary components are serial
R
s
jX
s
ss
jXRZ +
=
Real and imaginary components are Parallel
G=1/R
p
j
B=1/jX
p
jBGY +
=
j
X
p
P
jX
1
P
R
1
Y+=
R
p
Figure 1.2
1.3 Specification
z LCD Display Range:
Parameter Range
Z 0.000
Ω to 9999M Ω
L 0.000µH to 9999H
C 0.000pF to 9999F
DCR 0.000
Ω to 9999M Ω
ESR 0.000
Ω to 9999 Ω
D 0.000 to 9999
Q 0.000 to 9999
θ -180.0 ° to 180.0 °
6

z Accuracy ( Ae ):
Z Accuracy:
|Zx|
Freq.
20M ~
10M
(
Ω )
10M ~
1M
(
Ω )
1M ~
100K
(
Ω )
100K ~
10
(
Ω )
10 ~ 1
(
Ω )
1 ~ 0.1
(
Ω )
DCR
100Hz
120Hz
1KHz
2%
± 1
n
1%
± 1
10KHz 5%
± 1
n
2%
± 1
0 5%
± 102% ± 105% ± 1 1% ± 1
n
100KHz
(886)
NA 5%
± 1
n
2%
± 1 0.4% ± 12% ± 1 5% ± 1
n
Note : 1.The accuracy applies when the test level is set to 1Vrms.
2
.Ae multiplies 1.25 when the test level is set to 250mVrms.
3
.Ae multiplies 1.50 when the test level is set to 50mVrms.
4.When measuring L and C, multiply
Ae by
2
1Dx+
if the
Dx
＞ 0.1.
n : Ae is not specified if the test level is set to 50mV.
7

C Accuracy :
79 57
pF
|
159 1
pF
159 1
pF
|
1 591
nF
1 591
nF
|
15 91
nF
15 91
nF
|
159 1
uF
159 1
uF
|
1591
uF
1591
uF
|
15 91
mF
100Hz
2% ± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
66 31
pF
|
132 6
pF
132 6
pF
|
1 326
nF
1 326
nF
|
13 26
nF
13 26
nF
|
132 6
uF
132 6
uF
|
1326
uF
1326
uF
|
13 26
mF
120Hz
2%
± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
7 957
pF
|
15 91
pF
15 91
pF
|
159 1
pF
159 1
pF
|
1 591
nF
1 591
nF
|
15 91
uF
15 91
uF
|
159 1
uF
159 1
uF
|
1 591
mF
1KHz
2%
± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
0 795
pF
|
1 591
pF
1 591
pF
|
15 91
pF
15 91
pF
|
159 1
pF
159 1
pF
|
1 591
uF
1 591
uF
|
15 91
uF
15 91
uF
|
159 1
uF
10KHz
5% ± 1
X
2% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
NA 0 159
pF
|
1 591
pF
1 591
pF
|
15 91
pF
15 91
pF
|
159 1
nF
159 1
nF
|
1 591
uF
1 591
uF
|
15 91
uF
100KHz
(886)
NA 5%
± 1
X
2% ± 1 0 4%
± 1
2% ± 1 5% ± 1
X
8

L Accuracy :
31 83
KH
|
15 91
KH
15 91
KH
|
1591
H
1591
H
|
159 1
H
159 1
H
|
15 91
mH
15 91
mH
|
1 591
mH
1 591
mH
|
159 1
uH
100Hz
2%
± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
26 52
KH
|
13 26
KH
13 26
KH
|
1326
H
1326
H
|
132 6
H
132 6
H
|
13 26
mH
13 26
mH
|
1 326
mH
1 326
mH
|
132 6
uH
120Hz
2%
± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
31 83
KH
|
1 591
KH
1 591
KH
|
159 1
H
159 1
H
|
15 91
H
15 91
H
|
1 591
mH
1 591
mH
|
159 1
uH
159 1
uH
|
15 91
uH
1KHz
2% ± 1
X
1% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
318 3
H
|
159 1
H
159 1
H
|
15 91
H
15 91
H
|
1 591
H
1 591
H
|
159 1
uH
159 1
uH
|
15 91
uH
15 91
uH
|
1 591
uH
10KHz
5%
± 1
X
2% ± 1 0 5%
± 1
0 2%
± 1
0 5%
± 1
1% ± 1
X
31 83
H
|
15 91
H
15 91
H
|
1 591
H
1 591
H
|
159 1
mH
159 1
mH
|
15 91
uH
15 91
uH
|
1 591
uH
1 591
uH
|
0 159
uH
100KHz
(886)
NA 5%
± 1
X
2% ± 1 0 4%
± 1
2% ± 1 5% ± 1
X
9

D Accuracy :
|Zx|
Freq
20M ~
10M
( Ω )
10M ~
1M
( Ω )
1M ~
100K
( Ω )
100K ~
10
( Ω )
10 ~ 1
( Ω )
1 ~ 0 1
( Ω )
100Hz
120Hz
1KHz
± 0 020
n
± 0 010
10KHz
± 0 050
n
± 0 020
± 0 005 ± 0 002 ± 0 005 ± 0 010
n
100KHz
(886)
NA ± 0 050
n
± 0 020 ± 0 004 ± 0 020 ± 0 050
n
θAccuracy :
|Zx|
Freq
20M ~
10M
( Ω )
10M ~
1M
( Ω )
1M ~
100K
( Ω )
100K ~
10
( Ω )
10 ~ 1
( Ω )
1 ~ 0 1
( Ω )
100Hz
120Hz
1KHz
± 1 046
n
± 0 523
10KHz
± 2 615
n
± 1 046
± 0 261 ± 0 105 ± 0 261 ± 0 523
n
100KHz
(886)
NA ± 2 615
n
± 1 046 ± 0 209 ± 1 046 ± 2 615
n
10

Z Accuracy:
As shown in table 1.
C Accuracy:
Cxf
Zx ⋅⋅⋅ =
π 2
1
C
Ae
= Ae of |Zx|
f : Test Frequency (Hz)
Cx : Measured Capacitance Value (F)
|Zx| : Measured Impedance Value (
Ω )
Accuracy applies when Dx (measured D value)
≦ 0.1
When Dx > 0.1, multiply C
Ae
by
2
1Dx+
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then
Ω=
⋅⋅⋅⋅
=
⋅⋅⋅
=
−
1590
10100102
1
2
1
93
π
π
Cxf
Zx
Refer to the accuracy table, get C
Ae
=±0.2%
11

LAccuracy:
LxfZx ⋅⋅⋅= π 2
L
Ae
= Ae of |Zx|
f : Test Frequency (Hz)
Lx : Measured Inductance Value (H)
|Zx| : Measured Impedance Value (
Ω )
Accuracy applies when Dx (measured D value)
≦ 0.1
When Dx > 0.1, multiply L
Ae
by
2
1Dx+
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 1mH
Then
Ω=⋅⋅⋅=
⋅⋅⋅=
−
283.610102
2
33
π
π
LxfZx
Refer to the accuracy table, get L
Ae
=±0.5%
ESR Accuracy:
12

100
Ae
XxESRAe ⋅±=
Cxf
LxfXx ⋅⋅⋅ =⋅⋅⋅=
π
π
2
1
2
ESR
Ae
= Ae of |Zx|
f : Test Frequency (Hz)
Xx : Measured Reactance Value (
Ω )
Lx : Measured Inductance Value (H)
Cx : Measured Capacitance Value (F)
Accuracy applies when Dx (measured D value)
≦ 0.1
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then
Ω=
⋅⋅⋅⋅
=
⋅⋅⋅
=
−
1590
10100102
1
2
1
93
π
π
Cxf
Zx
Refer to the accuracy table, get
C
Ae
=±0.2%,
Ω±=⋅±= 18.3
100
Ae
XxESR
Ae
13

D Accuracy:
100
Ae
D
Ae
±=
D
Ae
= Ae of |Zx|
Accuracy applies when Dx (measured D value)
≦ 0.1
When Dx > 0.1, multiply Dx by (1+Dx)
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then
Ω=
⋅⋅⋅⋅
=
⋅⋅⋅
=
−
1590
10100102
1
2
1
93
π
π
Cxf
Zx
Refer to the accuracy table, get
C
Ae
=±0.2%,
002.0
100 ±=⋅±= Ae
D
Ae
Q Accuracy:
DeQx
DeQx
Ae
Q⋅
⋅
±= m1
2
14

Q
Ae
= Ae of |Zx|
Qx : Measured Quality Factor Value
De : Relative D Accuracy
Accuracy applies when
1
<
⋅
DeQx
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 1mH
Then
Ω=⋅⋅⋅=
⋅⋅⋅=
−
283.610102
2
33
π
π
LxfZx
Refer to the accuracy table, get
L
Ae
=±0.5%,
005.0
100 ±=⋅±= Ae
De
If measured Qx = 20
Then
1.01
2
1
2
m
m
±=
⋅
⋅
±= DeQx DeQx Q
Ae
15

θ Accuracy:
100
Ae
π
180
e⋅=θ
Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
Speed : Slow
DUT : 100nF
Then
Ω=
⋅⋅⋅⋅
=
⋅⋅⋅
=
−
1590
10100102
1
2
1
93
π
π
Cxf
Zx
Refer to the accuracy table, get
Z
Ae
=±0.2%,
deg115.0
100
2.0180
100
Ae180
Ae
±=⋅
π
±=
⋅
π
±=θ
z Testing Signal:
Level Accuracy : ± 5%
Frequency Accuracy : 0.1%
z Output Impedance : 100 Ω ± 5%
16

z Measuring Speed:
Fast : 4.5 meas. / sec.
Slow : 2.5 meas. / sec.
z General:
Temperature : 0
° C to 70 ° C (Operating)
-20
° C to 70 ° C (Storage)
Relative Humidity : Up to 85%
Battery Type : 2 AA size Ni-Mh or Alkaline
Battery Charge : Constant current 150mA
approximately
Battery Operating Time : 2.5 Hours typical
AC Operation : 110/220V AC, 60/50Hz with proper
adapter
Low Power Warning : under 2.2V
Dimensions : 174mm x 86mm x 48mm (L x W x H)
6.9” x 3.4” x 1.9”
Weight : 470g
NOTE: Specifications and information are subject to
change without notice. Please visit www.bkprecision.com
for the most current product information.
Considerations
Test Frequency. The test frequency is user selectable and can be
changed. Generally, a 1 KHz test signal or higher is used to measure
capacitors that are 0.01uF or smaller and a 120Hz test signal is used
for capacitors that are 10uF or larger. Typically a 1 kHz test signal or
higher is used to measure inductors that are used in audio and RF
(radio frequency) circuits. This is because these components operate
17

at higher frequencies and require that they be measured at a higher
frequency of 1 KHz. Generally, inductors below 2mH should be
measured at 1 kHz and inductors above 200H should be measured at
120Hz.
It is best to check with the component manufacturers’ data sheet to
determine the best test frequency for the device.
Charged Capacitors
Always discharge any capacitor prior to making a
measurement since a charged capacitor may seriously damage
the meter.
Effect Of High D on Accuracy
A low D (Dissipation Factor) reading is desirable. Electrolytic
capacitors inherently have a higher dissipation factor due to their
normally high internal leakage characteristics. If the D (Dissipation
Factor) is excessive, the capacitance measurement accuracy may be
degraded.
It is best to check with the component manufacturers’ data sheet to
determine the desirable D value of a good component.
Measuring Capacitance of Cables, Switches or Other Parts
Measuring the capacitance of coaxial cables is very useful in
determining the actual length of the cable. Most manufacturer
specifications list the amount of capacitance per foot of cable and
therefore the length of the cable can be determined by measuring the
capacitance of that cable.
18