Itm 885 User manual

Models
885 & 886
LCR METER
OPERATING
MANUAL
MANUAL DE INSTRUCCIÓNES
MEDIDOR LCR
Modelos 885 & 886
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Contents
1. INTRODUCTION ...............................................................1
1.1 G ENERAL .............................................................................1
1.2 I
MPEDANCE P ARAMETERS ..................................................3
1.3 S
PECIFICATION ....................................................................6
1.4 A
CCESSORIES ....................................................................19
2. OPERATION......................................................................21
2.1 P HYSICAL D ESCRIPTION ...................................................21
2.2 M
AKING M EASUREMENT .................................................21
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 A CCESSORY O PERATION ...................................................28
4. APPLICATION..................................................................30
4.1 T EST L EADS C ONNECTION ...............................................30
4.2 O
PEN /S HORT C OMPENSATION ..........................................35
4.3 S
ELECTING THE S ERIES OR P ARALLEL M ODE ..................37
5. LIMITED THREE-YEAR WARRANTY......................37
6. SAFETY PRECAUTION .................................................42
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1
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 0.2%. 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
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2
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:
1
Frequency : 100Hz / 120Hz / 1KHz / 10KHz /
100KHz (886)
2.
Level : 1Vrms / 0.25Vrms / 50mVrms /
1VDC (DCR only)
 Measurement Parameters : Z, Ls, Lp, Cs, Cp, DCR,
ESR, D, Q and
θ
 Basic Accuracy: 0.2%
 Dual Liquid Crystal Display
 Fast/Slow Measurement
 Auto Range or Range Hold
 Open/Short Calibration
 Primary Parameters Display:
Z : AC Impedance
DCR : DC Resistance
Ls : Serial Inductance
Lp : Parallel Inductance
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Cs : Serial Capacitance
Cp : Parallel Capacitance
 Second Parameter Display:
θ : Phase Angle
ESR : Equivalence Serial Resistance
D : Dissipation Factor
Q : Quality Factor
 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.
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( )
( )
( )
( )
( )
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:
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
s
X
s
R
( )
sX,RZ
s
Z
θ
Imaginary Axis
Real Axis
Figure 1.1
fCC
X
fLLX
C
L
πω
πω
211 2
==
==
L = Inductance (H)
C = Capacitance (F)
f = Frequency (Hz)
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5
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.
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.
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
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1.3 Specification
 LCD Display Range:
Parameter
Range
Z
0.000 Ω to 9999 M Ω
L
0.000 µH to 9999 H
C
0.000 pF to 9999 F
DCR
0.000
Ω
to 9999 M
Ω
ESR
0.000 Ω to 9999 Ω
D
0.000 to 9999
Q
0.000 to 9999
θ
-180.0
°
to 180.0
°
Figure 1.2
Real and imaginary components are serial
ss jXRZ +=
RsjXs
Real and imaginary components are Parallel
G=1/Rp
jB=1/jX
p
jBGY +=
jX
p
R
p
P
jX
1
P
R1
Y+=
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 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
2% ± 1
 1%
± 1 0.5% ± 1 0.2% ± 1 0.5% ± 1 1% ± 1

100Hz
120Hz
1KHz
10KHz
5% ± 1

2% ± 1
100KHz
(886)
NA
5%
±
1

2%
±
1
0.4%
±
1
2%
±
1
5%
±
1

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.
 : Ae is not specified if the test level is set to 50mV.
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C Accuracy :
100Hz
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
2% ±1

1% ±1
0.5%
±
1
0.2%
±
1
0.5%
±
1
1% ±1

120Hz
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
2% ±1

1% ±1
0.5%
±
1
0.2%
±
1
0.5%
±
1
1% ±1

1KHz
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
2% ±1

1% ±1
0.5%
±
1
0.2%
±
1
0.5%
±
1
1% ±1

10KHz
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
5% ±1

2% ±1
0.5%
±
1
0.2%
±
1
0.5%
±
1
1% ±1

100KHz
(886)
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
NA
5% ±1

2%±1
0.4%
±
1
2%±1
5% ±1

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