B&K Precision 889A Instruction Manual

INSTRUCTION MANUAL

Contents

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

1.1 G

ENERAL

......................................................................................................................................................................................................1

1.2 I

MPEDANCE PARAMETERS

1.3 S

PECIFICATION

1.4 A

CCESSORIES

..............................................................................................................................................................................................3

............................................................................................................................................................................................. 11

..............................................................................................................................................................................2

2. OPERATION............................................................................................................................................................................12

2.1 P

HYSICAL DESCRIPTION

2.2 M

AKING MEASUREMENT

2.2.1 Open and Short Calibration...........................................................................................................................................................13

2.2.2 Relative Mode................................................................................................................................................................................13

2.2.3 Range Hold....................................................................................................................................................................................13

2.2.4 DC Resistance Measurement........................................................................................................................................................14

2.2.5 AC Impedance Measurement........................................................................................................................................................14

2.2.6 Capacitance Measurement............................................................................................................................................................14

2.2.7 Inductance Measurement..............................................................................................................................................................14

..............................................................................................................................................................................12

..............................................................................................................................................................................13

3. OPERATION MODES.............................................................................................................................................................15

3.1 R

EMOTE MODE COMMAND SYNTAX

3.2 R

EMOTE MODE COMMANDS

.............................................................................................................................................................18

........................................................................................................................................................................18

4. APPLICATION.........................................................................................................................................................................24

4.1 T

EST LEADS CONNECTION

4.2 O

PEN/SHORT COMPENSATION

4.3 S

ELECTING THE SERIES OR PARALLEL MODE

...........................................................................................................................................................................24

.....................................................................................................................................................................26

...............................................................................................................................................27

5. LIMITED ONE-YEAR WARRANTY AND SERVICE INFORMATION.....................................................................................29

6. SAFETY PRECAUTION..........................................................................................................................................................31

1

1. Introduction

1.1 General

The B&K Precision Corp. 889A Synthesized In-Circuit LCR/ESR Meter is a high accuracy test instrument used
for measuring inductors, capacitors and resistors with a basic accuracy of 0.1%. Also, with the built-in functions of
DC/AC Voltage/Current measurements and Diode/Audible Continuity checks, the 889A can not only help
engineers and students to understand the characteristics of electronics components but also being an essential
tool on any service bench.

The 889A is defaulted to auto ranging. However, it can be set to auto or manual ranging by pressing the Range
Hold key. When LCR measurement mode is selected, one of the test frequencies, 100 Hz, 120 Hz, 1 KHz, 10
KHz, 100 KHz or 200 KHz, may be selected on all applicable ranges. One of the test voltages, 50mVrms, 0.25
Vrms, 1 Vrms or 1 VDC (DCR only), may also be selected on all applicable ranges. The dual display feature
permits simultaneous measurements. When DC/AC voltage/current measurement mode or the Diode/Audible
Continuity Check mode is selected, only the secondary display will be used to show the result of the
measurement.

The highly versatile 889A can perform virtually all the functions of most bench type LCR bridges. With a basic
accuracy of 0.1%, this economical LCR meter may be adequately substituted for a more expensive LCR bridge in
many situations. Also, with the basic accuracy of 0.4% in voltage and current measurements, the 889A performs
the functions of a general purpose Digital Multi-Meter and can be used to replace the DMM on a service bench.

The 889A has applications in electronic engineering labs, production facilities, service shops, and schools. It can
be used to check ESR values of capacitors, sort and/or select components, measure unmarked and unknown
components, and measure capacitance, inductance, or resistance of cables, switches, circuit board foils, etc.

The key features are as following:

1. Voltage Measurements:

l AC : True RMS, up to 600Vrms @ 40 ~ 1K Hz
l DC : up to 600V
l Input Impedance : 1M-Ohm

2. Current Measurements:

l AC : True RMS, up to 2Arms @ 40 ~ 1K Hz
l DC : up to 2A
l Current Shunt : 0.1 Ohm @ > 20mA; 10 Ohm @ ≤ 20mA

3. Diode/Audible Continuity Checks:

l Open Circuit Voltage: 5Vdc
l Short Circuit Current: 2.5mA
l Beep On: ≤ 25 Ω
l Beep Off: ≥ 50 Ω

4. LCR Measurements:
l Test conditions

Frequency : 100Hz / 120Hz / 1KHz / 10KHz / 100KHz / 200KHz
Level : 1Vrms / 0.25Vrms / 50mVrms / 1VDC (DCR only)

l Measurement Parameters : Z, Ls, Lp, Cs, Cp, DCR, ESR, D, Q and ?
l Basic Accuracy : 0.1%
l Dual Liquid Crystal Display
l Auto Range or Range Hold
l RS-232 Interface Communication
l Open/Short Calibration
l Primary Parameters Display:

Z : AC Impedance
DCR : DC Resistance
Ls : Serial Inductance
Lp : Parallel Inductance

Cs : Serial Capacitance

(

)

Ω∠=+=

θ

(

)

θ

I

maginary Axis

Real Axis

Figure 1.1

Cp : Parallel Capacitance

l Second Parameter Display:

? : Phase Angle
ESR : Equivalence Serial Resistance
D : Dissipation Factor
Q : Quality Factor

l 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 and AC
impedances. The common digital multi-meter can only measure the DC impedance, but the 889A can do both. It
is very important to understand the impedance parameters of the electronic components.

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 θ is the phase of the impedance.

X

s

Z

R

s

Z

jX

RZ

R

s

X

s

s

s

θ

( )

Impedance

=

Z

( )

Resistance

=

R

S

( )

Reactance

=

X

S

( )

Ohm

=Ω

sX,RZ

s

22

+==

RZCosZ

s



−

1

==

TanSinZ

θθ






X

s



X

s





R

s



There are two different types of reactance: Inductive (XL) and Capacitive (XC). It can be defined as follows:

X

L

X

C

fLL

πω

2====

11

fCC

πω

2

L = Inductance (H)
C = Capacitance (F)
f = Frequency (Hz)

Also, there are Quality factor (Q) and the Dissipation factor (D) that need to be discussed. For component, the
Quality factor serves as a measurement 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.

Figure 1.2

Real and imaginary components are serial

+

=

Real and imaginary components are parallel

G=1/R

jB=1/jX

jB

+

=

jXp R

Q

D

X

B

=

G

11

==

δ

tan

L

ω

s

R

s

R

p

X

p

s

R

s

R

p

L

ω

p

1

===

C

ω

===

sRs

R

C

ω

p

p

There are two types of the circuit mode, the series mode and the parallel mode. See Figure 1.2 to find out the
relationship of the series and parallel modes.

Rs jX

s

p

p

jXRZ

ss

1

1

Y +=

jX

R

P

P

p

GY

1.3 Specification

l Measuring Range:

Parameter Range

Z 0.000 Ω to 500.0 MΩ

L 0.030 µH to 9999 H

C 0.003 pF to 80.00 mF
DCR 0.000 Ω to 500.0 MΩ
ESR 0.000 Ω to 9999 Ω

D 0.000 to 9999

Q 0.000 to 9999

? -180.0 ° to 180.0 °

Voltage/Current Measurements
V 0.0 mV to +/- 600 V
A 0.000 mA to +/- 2 A

l Accuracy (Ae):

1. DC Voltage Measurement:
Range : 2V, 20V, 200V, and 600V
Resolution : 1mV, 10mV, 100mV, and 1V
Accuracy : +/- (0.4% + 3 digits)
Input Impedance : 1 M-Ohm

2. AC Voltage Measurement (True RMS):

10M

Range : 2V, 20V, 200V, and 600V
Resolution : 1mV, 10mV, 100mV, and 1V
Accuracy : +/- (0.8% + 5 digits)
Input Impedance : 1 M-Ohm

3. DC Current Measurement:
Range : 2mA, 20mA, 200mA, and 2000mA
Resolution : 1uA, 10uA, 100uA, and 1mA
Accuracy : +/- (0.4% + 3 digits)
Current Shunt : 0.1 Ohm @ >20mA, 10 Ohm @ ≤20mA

4. AC Current Measurement (True RMS):
Range : 2mA, 20mA, 200mA, and 2000mA
Resolution : 1uA, 10uA, 100uA, and 1mA
Accuracy : +/- (0.8% + 5 digits)
Current Shunt : 0.1 Ohm @ >20mA, 10 Ohm @ ≤20mA

Note:
The accuracy of DC/AC voltage/current measurements is only applied when in 5% - 100% of the range.

5. LCR Measurement:

Z Accuracy (Ae):

|Zx|

Freq.
DCR 0.1% ±1 0.2% ±1
100Hz
120Hz
1KHz
10KHz 5% ±1 Œ 2% ±1

100KHz
200KHz

Œ

20M ~

(Ω)

2% ±1

Œ

NA 5% ±1

10M ~

1M
(Ω)

1% ±1

1M ~
100K

(Ω)

0.5% ±1 0.2% ±1

2% ±1 1% ±1 0.4% ±1 1% ±1 2% ±1 5% ±1

100K ~

10K

(Ω)

10K ~

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

Π: Ae is applied only when the test level is set to 1Vrms.

2

1 Dx+ if the Dx> 0.1.

1K

(Ω)

1K ~ 100

(Ω)

100 ~ 1

(Ω)

0.5% ±1 1% ±1

1 ~ 0.1

(Ω)

Œ

C Accuracy:

100Hz

120Hz

79.57pF
|

159.1pF

2% ± 1 u 1% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1 1% ± 1

66.31pF
|

132.6pF

2% ± 1

u

159.1pF
|

1.591nF

132.6pF
|

1.326nF

1% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

1.591nF
|

15.91nF

1.326nF
|

13.26nF

15.91nF
|

159.1uF

13.26nF
|

132.6nF

159.1nF
|

1.591uF

132.6nF
|

1.326uF

1.591uF
|

15.91uF

1.326uF
|

13.26uF

15.91uF
|

1591uF

13.26uF
|

1326uF

1591uF

|

15.91mF

u

1326uF

|

13.26mF
1% ± 1

u

1KHz

10KHz

100KHz

u

200KHz

u

L Accuracy:

100Hz

7.957pF
|

15.91pF

2% ± 1

u

0.795pF
|

1.591pF

5% ± 1

u

NA 0.159pF

NA
NA 0.079pF

NA

31.83KH
|

15.91KH

2% ± 1

u

15.91pF

159.1pF

1% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

1.591pF

15.91pF
2% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

1.591pF
5% ± 1 2%± 1 1%± 1 0.4%± 1 1%± 1 2%± 1 5% ± 1

0.795pF
5% ± 1 2%± 1 1%± 1 0.4%± 1 1%± 1 2%± 1 5% ± 1

15.91KH

1591H

1% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

159.1pF

|

|

|

|

|

|

1.591nF

15.91pF
|

159.1pF

1.591pF
|

15.91pF

0.795pF
|

7.957pF

1591H

|

159.1H

1.591nF
|

15.91nF

159.1pF
|

1.591nF

15.91pF
|

159.1pF

7.957pF
|

79.57pF

159.1H
|

15.91H

15.91nF
|

159.1nF

1.591nF
|

15.91nF

159.1pF
|

1.591nF

79.57pF
|

795.7pF

15.91H
|

1.591H

159.1nF
|

1.591uF

15.91nF
|

159.1nF

1.591nF
|

15.91nF

795.7pF
|

7.957nF

1.591H
|

159.1mH

1.591uF
|

159.1uF

159.1nF
|

15.91uF

15.91nF
|

1.591uF

7.957nF
|

795.7nF

159.1mH
|

1.591mH

159.1uF
|

1.591mF
1% ± 1

u

15.91uF
|

159.1uF

1% ± 1

u

1.591uF
|

15.91uF

795.7nF
|

7.957uF

1.591mH
|

159.1uH
1% ± 1

u

26.52KH
|

120Hz

1KHz

13.26KH

2% ± 1

u

3.183KH
|

1.591KH

2% ± 1

u

13.26KH
|

1326H

1% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

1.591KH
|

159.1H

1% ± 1 0.5% ± 1 0.2% ± 1

1326H

|

132.6H

159.1H
|

15.91H

132.6H
|

13.26H

15.91H
|

1.591H

13.26H
|

1.326H

1.591H
|

159.1mH

0.1% ± 1 0.2% ± 1

1.326H
|

132.6mH

159.1mH
|

15.91mH

132.6mH
|

1.326mH

15.91mH
|

159.1uH

0.5%
± 1

1.326mH
|

132.6uH
1% ± 1

u

159.1uH

|

15.91uH
1% ± 1

u

10KHz

100K ~

100K ~

318.3H
|

159.1H

5% ± 1

u

159.1H
|

15.91H

2% ± 1 0.5% ± 1 0.2% ± 1 0.1% ± 1 0.2% ± 1 0.5% ± 1

15.91H
|

1.591H

1.591H
|

159.1mH

159.1mH
|

15.91mH

15.91mH
|

1.591mH

1.591mH
|

15.91uH

15.91uH
|

1.591uH

1% ± 1

u

100KHz

u

200KHz

u

D Accuracy:

31.83H
|

15.91H

NA

15.91H
|

7.957H

NA

|Zx|

Freq.

100Hz ±0.002 ±0.002
120Hz

1KHz

10KHz ±0.050 Œ ±0.020

15.91H
|

1.591H

5% ± 1 2%± 1 1% ± 1 0.4% ± 1 1% ± 1 2%± 1 5% ± 1

7.957H
|

795.7mH
5% ± 1 2%± 1 1% ± 1 0.4% ± 1 1% ± 1 2%± 1 5% ± 1

20M ~

10M

(Ω)

±0.020 Œ ±0.010

1.591H
|

159.1mH

795.7mH
|

79.57mH

10M ~

1M
(Ω)

159.1mH
|

15.91mH

79.57mH
|

7.957mH

1M ~
100K

(Ω)

±0.005 ±0.002

10K

(Ω)

15.91mH
|

1.591mH

7.957mH
|

795.7uH

10K ~

1K

(Ω)

1.591mH

159.1uH

795.7uH

79.57uH

1K ~

100

(Ω)

159.1uH

|

1.591uH

79.57uH

|

0.795uH

100 ~ 1

±0.005 ±0.010

(Ω)

1 ~ 0.1

(Ω)

Œ

1.591uH

|

|

|

0.159uH

0.795uH
|

0.079uH

θ Accuracy:

100KHz
200KHz

u

|Zx|

Freq.

100Hz ±0.105 ±0.105
120Hz

1KHz

10KHz ±2.615 Œ ±1.046

100KHz
200KHz

u

NA ±0.050

20M ~

10M

(Ω)

±1.046 Œ ±0.523

NA ±2.615

10M ~

1M
(Ω)

±0.020

1M ~
100K

±0.261 ±0.105

±1.046

±0.010 ±0.004 ±0.010 ±0.020 ±0.050

10K

(Ω)

(Ω)

±0.409 ±0.209 ±0.409 ±1.046 ±2.615

10K ~

1K

(Ω)

1K ~

100

(Ω)

100 ~ 1

±0.261 ±0.523

(Ω)

1 ~ 0.1

(Ω)

Œ

Z Accuracy:

As shown in table 1.

C Accuracy:

1

CxfZx⋅⋅⋅=π2

CAe = Ae of C
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 CAe by

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 100nF

Then

=

Zx

=

π

Refer to the accuracy table, get CAe=±0.1%

L Accuracy:

LAe = Ae of L
f : Test Frequency (Hz)
Lx : Measured Inductance Value (H)
|Zx| : Measured Impedance Value (Ω)
Accuracy applies when Dx (measured D value) ≤ 0.1

1

π Cxf

⋅⋅⋅

2

1

−

3

102

9

⋅⋅⋅⋅

10100

LxfZx ⋅⋅⋅= π2

1590

1 Dx+

Ω=

2

When Dx > 0.1, multiply LAe by

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 1mH
Then

⋅⋅⋅=

π LxfZx

−

3

3

⋅⋅⋅=

10

Refer to the accuracy table, get L

1022π

Ω=

283.6

1 Dx+

= ±0.5%

Ae

2

ESR Accuracy:

100

100

100

100

Ae

ESR ⋅±=

Ae

ESRAe = Ae of ESR
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
DUT : 100nF

Xx

2

Then

=

Zx

=

Refer to the accuracy table, get
CAe=±0.1%,

ESR

Ae

D Accuracy:

D ±=

Ae

DAe = Ae of D measurement value
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
DUT : 100nF

1

π Cxf

102

3

Ae

1

Xx

⋅⋅⋅

1590

−

9

⋅⋅⋅⋅

10100

Ae

Ω=

Ω±=⋅±= 59.1

2

π

LxfXx

=⋅⋅⋅=ππ

1

Cxf

2

⋅⋅⋅

Then

=

Zx

=

Refer to the accuracy table, get
CAe=±0.1%,

D

Ae

1

π Cxf

102

⋅⋅⋅

1

3

Ae

⋅⋅⋅⋅

10100

±=⋅±=

1590

−

9

002.0

2

π

Ω=

Q Accuracy:

<

⋅

100

1.0

1

2

m

100Aep

2

DeQx

⋅

Q

QAe = Ae of Q measurement value
Qx : Measured Quality Factor Value
De : Relative D Accuracy
Accuracy applies when

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 1mH

Then

Refer to the accuracy table, get
LAe=±0.5%,

De

Ae

±=

m1

⋅⋅⋅=

π LxfZx

3

⋅⋅⋅=

10

1022π

Ae

DeQx

⋅

−

3

005.0

±=⋅±=

1

DeQx

Ω=

283.6

If measured Qx = 20
Then

⋅

DeQx

m

⋅

DeQx

⋅=

1

⋅⋅⋅

1

3

π

⋅⋅⋅⋅

Ae

⋅±=

100

1.0180

±=⋅±=

Ae

Ae

Ae

±=

1

2

±=

180

=

2

π Cxf

102

π

180

100

π

Q

? Accuracy:

θ

Example:
Test Condition:
Frequency : 1KHz
Level : 1Vrms
DUT : 100nF

Then

Zx

=

Refer to the accuracy table, get
ZAe=±0.1%,

θ

Ω=

1590

−

9

10100

deg057.0

l Testing Signal:

Level Accuracy : ± 10%
Frequency Accuracy : 0.1%

l Output Impedance : 100Ω ± 5%

l General:

Temperature : 0°C to 70°C (Operating)

-20°C to 70°C (Storage)
Relative Humidity : Up to 85%
AC Power : 110/220V, 60/50Hz
Dimensions : 300mm x 220mm x 150mm (L x W x H) 11.8” x 8.7” x 5.9”
Weight : 4500g

Considerations

When LCR measurement mode is selected, the following factors shall be considered.

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 kinds of inductors operate at higher frequencies and
require that they shall be measured at a higher frequency. Generally, inductors with inductances below 2mH
should be measured at test frequency of 1 KHz or higher and inductors above 200H should be measured at
120Hz or lower.

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.

For example: A manufacturers, specification calls out a certain cable, to have a capacitance of 10 pF per foot,
After measuring the cable, a capacitance reading of 1.000nF is displayed. Dividing 1000pF (1.000 nF) by 10 pF
per foot yields the length of the cable to be approximately 100 feet.

Even if the manufacturers’ specification is not known, the capacitance of a measured length of cable (such as 10
feet) can be used to determine the capacitance per foot. Do not use too short length such as one foot, because
any error becomes magnified in the total length calculations.

Sometimes, the affecting stray capacitance of switches, interconnect cables, circuit board foils, or other parts,
could be critical to circuit design, or must be repeatable from one unit to another.

Series Vs Parallel Measurement (for Inductors) The series mode displays the more accurate measurement in
most cases. The series equivalent mode is essential for obtaining an accurate Q reading of low Q inductors.
Where ohmic losses are most significant, the series equivalent mode is preferred. However, there are cases

where the parallel equivalent mode may be more appropriate. For iron core inductors operating at higher
frequencies where hysteresis and eddy currents become significant, measurement in the parallel equivalent
mode is preferred.

1.4 Accessories

l Operating Manual 1 pc
l AC Power Cord 1 pc
l Kelvin Clip 1 pc
l DMM Test Leads 1 pc

2. Operation

2.1 Physical Description

1. Primary Parameter Display 2. Secondary Parameter Display

3. L/C/Z/DCR Function Key 4. DCA/ACA Function Key

5. Measurement Frequency Key 6. LCUR Terminal

7. Measurement Level Key 8. Range Hold Key

9. Model Number 10. LPOT Terminal

11. D/Q/?/ESR Function Key 12. HPOT Terminal

13. Open Calibration Key 14. DCV/ACV Function Key

15. Relative Key 16. HCUR Terminal

17. Short Calibration Key 18. Diode/Continuity Function Key

19. Remote Function Key

21. Power Switch

23. AC Power

25. Exhaust Perforation

27. 2A Fuse

20. COM Terminal

22. V/Diode/Continuity Terminal

24. RS-232 Port

26. A Terminal

2.2 Making Measurement

2.2.1 Open and Short Calibration
The 889A provides open/short calibration capability so the user can get better accuracy in measuring high and

low impedance. We recommend that the user perform open/short calibration if the test level or frequency has
been changed.

l Open Calibration
First, remaining the measurement terminals at the open status, press the Open key then the LCD will display:

This calibration takes about 15 seconds. After it is finished, the 889A will beep to show that the calibration is done.
l Short Calibration

To perform the short calibration, insert the Shorting Bar into the measurement terminals. Press the Short key
then the LCD will display:

This calibration takes about 15 seconds. After it is finished, the 889A will beep to show that the calibration is done.

2.2.2 Relative Mode
The relative mode lets the user to make a quick sort of a bunch of components. First, insert the standard value

component to get the standard value reading. (Approximately 5 seconds to get a stable reading.) Then, press the
Relative key, the primary display will reset to zero. Remove the standard value component and insert the
unknown component, the LCD will show the value that is the difference between the standard value and unknown
value.

2.2.3 Range Hold
To set the range hold, insert a standard component in that measurement range. (Approximately 5 seconds to get

a stable reading.) Then, by pressing the Range Hold key it will hold the range within 0.5 to 2 times of the current
measurement range. When the Range Hold is pressed, the LCD will display:

2.2.4 DC Resistance Measurement
The DC resistance measurement measures the resistance of an unknown component by 1VDC. Press the

L/C/Z/DCR key to select the DCR measurement. The LCD will display:

2.2.5 AC Impedance Measurement

The AC impedance measurement measures the Z of an unknown device. Press the L/C/Z/DCR key to select the
Z measurement. The LCD will display:

The testing level and frequency can be selected by pressing the Level key and Freq key, respectively.

2.2.6 Capacitance Measurement
To measure the capacitance of a component, users may be able to press the L/C/Z/DCR key to select either Cs

(Serial Mode) or Cp (Parallel Mode) measurement mode. If the serial mode (Cs) is selected, the D, Q and ESR
can be shown on the secondary display. If the parallel mode (Cp) is selected, only the D and Q can be shown on
the secondary display. The following shows some examples of capacitance measurement:

The testing level and frequency can be selected by pressing the Level key and Freq key, respectively.

2.2.7 Inductance Measurement

Press the L/C/Z/DCR key to select Ls or Lp mode for measuring the inductance in serial mode or parallel mode.
If the serial mode (Ls) is selected, the D, Q and ESR can be shown on the secondary display. If the parallel mode
(Lp) is selected, only the D and Q can be shown on the secondary display. The following shows some examples
of inductance measurement:

The testing level and frequency can be selected by pressing the Level key and Freq key, respectively.

3. Operation Modes

There are four operation modes in the 889A. They are Normal, Binning, Remote and Remote Binning modes.
By pressing the Remote button, users can select one of the 4 operation modes above.

l Normal Mode:

The Normal mode is the default operation mode when power on. It is a local mode that the 889A is controlled
by the keypads and the results of the measurement will be sent to both LCD display and a remote RS-232
equipped PC through the build-in RS-232 port.

l Binning Mode:

The Binning mode is reserved for future use (such as GPIB). Currently, it is set to work the same way as the
Normal mode that receives commands from the keypads and sends the results of measurement to both LCD
display and a remote PC through the RS-232 port.

l Remote Binning Mode:

In the Remote Binning mode, the “RMT Bin” on the LCD will be lit, the operation of 889A is controlled by a
remote RS-232 equipped PC or terminal, and the results of the measurement will be simultaneously sent to the
local LCD display and remote workstation through the RS-232 port.

In this mode all functional keypads except Remote button are locked.
Remote Binning mode is opened for users to design your own private, fast and high efficient application

programs. Users can design a server or driver (any software component that can do server’s job) with Graphic
interface, OSI network model, and powerful interpreter built in it to support Graphic display, Network
connectivity, structure command (SCPI, IEEE488 etc.) interpretations, and let it be a bridge between a higher
level application program such as VB, VISUAL C++, EXCEL, ACCESS etc. and the 889A. It is described in
the following figure.

Server:

Model

4090

COM, DCOM, ATL,
CONTROL,
AUTOMATION EXE

Built in:

Graphic interface,
OSI network model,

and/or powerful
Interpreter or Parser

VB, VISUAL
C++, EXCEL,
ACCESS etc.

The communication protocol between the 889A and a remote RS-232 equipped PC is described as follows.

1. The commands that will be sent from a remote PC to the 889A are used to set-up the machine to a
selected measurement mode.

The command syntax is:

MOD current-state-code

It always starts with MOD follows by a space and then the current state code. The current state code that
is defined in the table below is 3 bytes (24 bits) long, bit-23, 22, 21… bit-0, where bit-23 is the MSB and bit-0
is the LSB.

bit position LCR DC/AC V/A
Bit 2 – Bit 0 (test freq) Reserved

000 100 Hz
001 120 Hz
010 1K Hz
011 10K Hz
100 100K Hz
101 200K Hz
110 Reserved
111 Reserved
Bit 4 – Bit 3 (test level) Reserved
00 50 mVrms
01 250 mVrms
10 1 Vrms
11 Reserved
Bit 5 Reserved
0 Default Default
1 Reserved Reserved
Bit 6
0 Relative Relative
1 Normal Normal
Bit 7
0 Calibration Calibration
1 Normal Normal
Bit 10 – Bit 8 Reserved
000 Lp
001 Ls
010 Cp
011 Cs
100 Z
101 DCR
110 Reserved
111 Reserved
Bit 12 – Bit 11 Reserved
00 D
01 Q
10 DEG
11 ESR
Bit 16 – Bit 13
0000 RH nH Reserved
0001 RH uH RH mV, mA
0010 RH mH RH V, A
0011 RH H Reserved
0100 RH pF
0101 RH nF
0110 RH uF
0111 RH mF
1000 RH F
1001 RH Ohm
1010 RH K-Ohm
1011 RH M-Ohm
1100 Reserved

1101
1110
1111 Auto-Ranging Auto-Ranging
Bit 17
0 Short Cal Short Cal
1 Open Cal Reserved

Bit 21 – Bit 18 Measurement Modes
0000 Reserved
0001 LCR
0010 DCV
0011 ACV
0100 Diode
0101 Continuity
0110 DCA
0111 ACA
Others Reserved
Bit 23 – Bit 22 Reserved
00
01
10
11

For example: if LCR function, Cp with D measurement mode is selected in Auto-ranging with Relative and
Open/Short Calibration are turned off and test signal is 1 Vrms in 1 KHz, then the command is as following:

MOD 000001111110001011010010

2. The results of the measurement that will be sent from the 889A to a remote PC will be packed in either
7-byte or 11-byte format.

When dual data (such as Cp with D) will be sent, the data is packed in 11-byte format shown as following:
Lead_code1 : 02
Lead_code2 : 09
Data_code : 8-byte long; two 32-bit floating point number format; the first 4-byte is the main reading (Cp)
and the second 4-byte is the secondary reading (D)
Checksum : -((02+09+data_code) && 0x00FF)

02 09 M-B0 M-B1 M-B2 M-B3 S-B0 S-B1 S-B2 S-B3 CS

where M-Bx and S-Bx are the four bytes floating point format of main and secondary reading which is sent
from the lowest byte first.

When only main reading (such as DCR) will be sent, the data is packed in 7-byte format described below:
Lead_code1 : 02
Lead_code2 : 03
Data_code : 4 bytes long; the 32-bit floating point format of the main reading
Checksum : -((02+03+data_code) && 0x00FF)

02 03 M-B0 M-B1 M-B2 M-B3 CS

When only secondary reading (such as DCV) will be sent, the data is packed in 11-byte format described
below:
Lead_code1 : 02
Lead_code2 : 09

Data_code : 8 bytes long; two 32-bit floating point format of the secondary reading
Checksum : -((02+09+data_code) && 0x00FF)

02 09 S-B0 S-B1 S-B2 S-B3 S-B0 S-B1 S-B2 S-B3 CS

l Remote Mode:

When in the Remote mode, the “RMT” on the LCD will be lit and the 889A is capable of communicating to
remote RS-232 equipped PC or terminal through the build-in RS-232 port. The connection setting is as follow:
Transmission Mode : Half Duplex
Baud Rate : 9600
Parity Bit : None
Data Bits : 8
Stop Bit : 1
Handshake : None
In this mode, the LCD display and all keypads except the Remote button will be locked. And the external
program through the RS-232 port controls the operation of the 889A.

3.1 Remote Mode Command Syntax

The command syntax of Models 4090 is as following:
COMMAND(?) (PARAMETER)
The format of COMMAND and PARAMETER is as following:

1. There is at least one space between COMMAND and PARAMETER.

2. The PARAMETER should use only ASCII string not numerical code.

3. Value parameter can be integer, floating or exponent with the unit. For example:
50mV

0.05V

5.0e1mV

4. The question mark (?) at the end of COMMAND means a query or a measuring command. For example:
“CpD” sets the measurement mode to Cp and D.

“CpD?” sets the measurement mode to Cp and D as well as measures the values and send them back.

5. The COMMAND and PARAMETER can be either upper or lower case. But the unit to describe the value in the
PARAMETER should have different between milli (m) and mega (M). For example:

1mV equals 0.001V.
1MV equals 1000000V.

6. The “end of command” character should be placed at the end. There are:
ASCII CR (0DH) or

ASCII LF (0AH)

3.2 Remote Mode Commands

Measurement Setting (or Querying) Command

The following measurement mode-setting and the query commands are supported in the 889A. When a mode-setting
command is entered the 889A will return “OK” after setting is complete. When query command is entered, the 889A will send
back the values of measurement.

l DCR(?) DC resistance measurement mode setting or querying command.
l CpRp(?) Parallel capacitance and parallel resistance measurement mode setting or querying command.
l CpQ(?) Parallel capacitance and quality factor measurement mode setting or querying command.
l CpD(?) Parallel capacitance and dissipation factor measurement mode setting or querying command.

l CsRs(?) Serial capacitance and serial resistance measurement mode setting or querying command.
l CsQ(?) Serial capacitance and quality factor measurement mode setting or querying command.
l CsD(?) Serial capacitance and dissipation factor measurement mode setting or querying command.
l LpRp(?) Parallel inductance and parallel resistance measurement mode setting or querying command.
l LpQ(?) Parallel inductance and quality factor measurement mode setting or querying command.
l LpD(?) Parallel inductance and dissipation factor measurement mode setting or querying command.
l LsRs(?) Serial inductance and serial resistance measurement mode setting or querying command.
l LsQ(?) Serial inductance and quality factor measurement mode setting or querying command.
l LsD(?) Serial inductance and dissipation factor measurement mode setting or querying command.
l RsXs(?) Serial resistance and serial reactance measurement mode setting or querying command.
l RpXp(?) Parallel resistance and parallel reactance measurement mode setting or querying command.
l ZTD(?) Impedance and angle (Deg) measurement mode setting or querying command.
l ZTR(?) Impedance and angle (Rad) measurement mode setting or querying command.
l DCV(?) DC Voltage measurement mode setting or query command.
l ACV(?) AC Voltage measurement mode setting or query command.
l DCA(?) DC Current measurement mode setting or query command.
l ACA(?) AC Current measurement mode setting or query command.

Example:
CPD (set to Cp-D measurement mode)

OK

CPD?

0.22724 0.12840 (return values)

DCR?

5.1029 (return value)

*IDN?

Query the identity of the 889A. This command is used to identify the basic information of 889A. The return value
has four fields separated by comma (,). The total length will not greater than 100 characters. The four fields are:

1. Manufacturer Name

2. Model Number

3. Serial Number

4. Firmware Version Number

Example:
*IDN?

B&K PRECISION CORP. MODEL4090,123456789,4.096

*RST

Reset the 889A to the power on default status. The default status is:
1KHz 1Vrms CpD uF
After the 889A is reset, it will return the identity string back.

ASC

Set the format of the return value. This command sets the ASCII string return or the numerical code.
PARAMETER:

ON ASCII string
OFF Numerical code

Example:
ASC ON
OK (return)
FREQ?
1KHz (return)

ASC OFF
OK (return)
FREQ?

2 (return)

CORR OPEN

Perform the open calibration. This command sets the 889A to do the open calibration. After the calibration is done,
the 889A will return the “OK” string back.

CORR SHORT

Perform the short calibration. This command sets the 889A to do the short calibration. After the calibration is done,
the 889A will return the “OK” string back.

FREQ(?) PARAMETER

Set (query) the measurement frequency.

l FREQ PARAMETER

Set the measurement frequency according to the parameter. When setting command is entered, the 889A will
return “OK” string after setting is done.
PARAMETER:

ASCII string Numerical code
100Hz 0
120Hz 1
1KHz 2
10KHz 3
100KHz 4
200KHz 5

Example:

FREQ 100KHz
OK (return)

l FREQ?

Return the current measurement frequency setting.
Example:

ASC ON
OK
FREQ?
1KHz (return value)

ASC OFF
OK
FREQ?
2 (return value)

LEV(?) PARAMETER
Set (query) the measurement level.

l LEV PARAMETER

Set the measurement level according to the parameter. When setting is done the 889A will return “OK” string.
PARAMETER:

ASCII string Numerical code
1VDC 0
1Vrms 1
250mVrms 2
50mVrms 3

Example:

LEV 1V

OK

l LEV?

Return the current measurement level setting.
Example:

ASC ON
OK
LEV?
1Vrms (return value)

ASC OFF
OK
LEV?
1 (return value)

MODE?
Query the measurement mode. If in LCR measurement mode, six fields will be returned.

1. Frequency

2. Level

3. Measurement mode

4. Unit of primary display

5. Unit of secondary display

The existence of field 5 depends on the measurement mode. For example, there’s no field 5 if the measurement
mode is DCR. The separation between fields is space (ASCII 20H).
Example:

ASC ON
OK
CPD
OK
MODE?
1KHz 1Vrms CpD uF (return value)

ASC ON
OK
CPRP
OK
MODE?
1KHz 1Vrms CpRp uF Ohm (return value)

If in Voltage measurement mode, three fields will be returned.

1. Measurement mode

2. Unit of primary display

Example:
ASC ON

OK
DCV
OK
MODE?
DCV V (return value)

RANG mV
OK
MODE?
DCV mV (return value)

RANG(?) PARAMETER
Set (query) the measurement unit.

l RANG PARAMETER

Set the measurement unit according to the parameter. “OK” string will be returned when setting is complete.
PARAMETER:

ASCII string Numerical code
pF 0
nF 1
uF 2
mF 3
F 4
nH 8
uH 9
mH 10
H 11
KH 12
mOhm 17
Ohm 18
KOhm 19
MOhm 20
mV 21
V 22
mA 23
A 24

Example:

RANG pF

OK

l RANG?

Return the current measurement unit setting.
Example:

ASC ON
OK
RANG?
pF (return value)

ASC OFF
OK
RANG?
0 (return value)

READ?
Return the measurement value. This command will perform a measurement according to the current

measurement mode and return the measured value.
Example:

CPD
OK
READ?

0.22724 0.12840 (return value)

DCR
OK
READ?

5.1029 (return value)

The “DCR”, “DCV”, and “ACV” measurements will send only one measured value. The other measurement
modes will send two measured values separated by space (ASCII 20H).

4. Application

R

4.1 Test Leads Connection

Auto balancing bridge has four terminals (H

CUR

, H

POT

, L

CUR

and L

) to connect to the device under test (DUT).

POT

It is important to understand what connection method will affect the measurement accuracy.
l 2-Terminal (2T)

2-Terminal is the easiest way to connect the DUT, but it contents many errors that are the inductance and
resistance as well as the parasitic capacitance of the test leads (Figure 4.1). Due to these errors in
measurement, the effective impedance measurement range will be limited at 100Ω to 10KΩ.

o

L

o

H

CUR

H

POT

L

POT

L

CUR

(a) CONNECTION

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE( £[)

DUT

A

V

(b) BLOCK DIAGRAM

2T

RoL

Co

o

DUT

Figure 4.1

l 3-Terminal (3T)

3-Terminal uses coaxial cable to reduce the effect of the parasitic capacitor (Figure 4.2). The shield of the
coaxial cable should connect to guard of the instrument to increase the measurement range up to 10MΩ.

R

o

L

o

H

CUR

H

POT

L

POT

L

CUR

(a) CONNECTION

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[)

(d) 2T CONNECTION WITH SHILDING

DUT

A

V

A

V

RoL

(b) BLOCK DIAGRAM

3T

DUT

Co

DUT

Co doesn't
effect
measurement
result

o

Figure 4.2

l 4-Terminal (4T)

4-Terminal connection reduces the effect of the test lead resistance (Figure 4.3). This connection can improve
the measurement range down to 10mΩ. However, the effect of the test lead inductance can’t be eliminated.

A

H

CUR

H

POT

L

POT

L

CUR

DUT

V

DUT

(a) CONNECTION

(b) BLOCK DIAGRAM

4T

1m 10m 100m 1 10 1K 10K 100K 1M100 10M

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[)

Figure 4.3

l 5-Terminal (5T)

5-Terminal connection is the combination of 3T and 4T (Figure 4.4). It has four coaxial cables. Due to the
advantage of the 3T and 4T, this connection can widely increase the measurement range for 10mΩ to 10MΩ.

A

H

CUR

H

POT

L

POT

CUR

L

(a) CONNECTION

DUT

V

(b) BLOCK DIAGRAM

5T

DUT

1m 10m 100m 1 10 1K 10K 100K 1M100 10M
(c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[)

A

V

(d) WRONG 4T CONNECTION

DUT

Figure 4.4

l 4-Terminal Path (4TP)

4-Terminal Path connection solves the problem that caused by the test lead inductance. 4TP uses four coaxial
cables to isolate the current path and the voltage sense cable (Figure 4.5). The return current will flow through
the coaxial cable as well as the shield. Therefore, the magnetic flux that generated by internal conductor will
cancel out the magnetic flux generated by external conductor (shield). The 4TP connection increases the
measurement range from 1mΩ to 10MΩ.

H

CUR

H

POT

L

POT

L

CUR

DUT

V

DUT

A

(a) CONNECTION

4T

1m 10m100m 1 10 1K 10K 100K 1M100 10M

(c) TYPICAL IMPEDANCE

MEASUREMENT RANGE(£[)

(b) BLOCK DIAGRAM

H

CUR

H

POT

L

POT

L

CUR

(d) 4T CONNECTION WITH SHILDING

DUT

Figure 4.5

l Eliminating the Effect of the Parasitic Capacitor

When measuring the high impedance component (i.e. low capacitor), the parasitic capacitor becomes an
important issue (Figure 4.6). In figure 4.6(a), the parasitic capacitor Cd is paralleled to DUT as well as the Ci
and Ch. To correct this problem, add a guard plane (Figure 4.6(b)) in between H and L terminals to break the
Cd. If the guard plane is connected to instrument guard, the effect of Ci and Ch will be removed.

H

CURHPOTLPOTLCUR

Cd

H

CURHPOTLPOTLCUR

Guard

Plant

DUT

Connection

Point

C

h

C

l

Ground

(a) Parastic Effect

(b) Guard Plant reduces

Parastic Effect

Figure 4.6

4.2 Open/Short Compensation

For those precision impedance-measuring instruments, the open and short compensation need to be used to
reduce the parasitic effect of the test fixture. The parasitic effect of the test fixture can be treated like the simple
passive components in figure 4.7(a). When the DUT is open, the instrument gets the conductance Yp = Gp +
jωCp (Figure 4.7(b)). When the DUT is short, the instrument gets the impedance Zs = Rs + jωLs (Figure 4.7(c)).
After the open and short compensation, the 889A has Yp and Zs that can then be used for the real Zdut
calculation (Figure 4.7(d)).

Parastic of the Test Fixture

Redundant
Impedance

H

CUR

H

POT

Z

m

L

POT

L

CUR

(a) Parastic Effect of the Test Fixture

(Zs)

R

s

Parastic
Conductance

L

s

(Yo)

G

o

C

o

Zdut

H

CUR

H

POT

L

POT

L

CUR

R

s

L

s

Y

o

Yo = Go + j£sC
(Rs + j£s<< )

Go+j£sC

(b) OPEN Measurement

o

1

C

o

o

OPEN

G

o

H

CUR

R

s

L

s

H

POT

Z

s

L

POT

L

CUR

Zs = Rs + j£sL

(c) SHORT Measurement

s

C

o

G

o

SHORT

Z

s

Z

m

Y

o

Zdut

(d) Compensation Equation

Zdut =
1-(Zm-Zs)Y

Zm - Z

s

o

Figure 4.7

4.3 Selecting the Series or Parallel Mode

According to different measuring requirement, there are series and parallel modes to describe the
measurement results. It is depending on the high or low impedance value to decide what mode to be used.

l Capacitor

The impedance and capacitance in the capacitor are negatively proportional. Therefore, the larger
capacitance means the lower impedance, the smaller capacitance means the higher impedance. Figure 4.8
shows the equivalent circuit of capacitor. If the capacitance is small, the Rp is more important than the Rs. If
the capacitance is large, the Rs shouldn’t be avoided. Hence, it is properly to use parallel mode for low
capacitance measurement and series mode for high capacitance measurement.

R

C

R

Effect

R

P

C R

Figure 4.9

R

P

L R

R

P

L R

Small capacitor
(High impedance)

Large capacitor
(Low impedance)

P

No Effect

S

No Effect

S

Effect

l Inductor

The impedance and inductance of a inductor are positively proportional when test frequency is fixed.
Therefore, the larger inductance equals to higher impedance and vice versa. Figure 4.9 shows the equivalent
circuit of inductor. When the inductance is small, the Rs becomes more important than the Rp. When the
inductance is large, the Rp should be taking into consideration. Therefore, it is properly using series mode to
measure an inductor with low inductance and parallel mode to measure an inductor with high inductance.

Large inductor
(High impedance)

Effect

S

No Effect

Small inductor
(Low impedance)

No Effect

S

Effect

5. Limited ONE-Year Warranty

Limited One-Year Warranty

B&K Precision Corp. warrants to the original purchaser that its product and the component
parts thereof, will be free from defects in workmanship and materials for a period of one year
from the data of purchase.
B&K Precision Corp. will, without charge, repair or replace, at its’ option, defective product or
component parts. Returned product must be accompanied by proof of the purchase date in
the form a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by completing and
mailing the enclosed warranty card to B&K Precision Corp., 22820 Savi Ranch Parkway,
Yorba Linda, CA 92887 within fifteen (15) days from proof of purchase.

Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alternations or repairs. It is void if the serial number

is alternated, defaced or removed.

B&K Precision Corp. shall not be liable for any consequential damages, including without
limitation damages resulting from loss of use. Some states do not allow limitation of incidental
or consequential damages, so the above limitation or exclusion may not apply to you.

This warranty gives you specific rights and you may have other rights, which vary from
state-to-state.

Model Number: ______________ Date Purchased: __________

22820 Savi Ranch Parkway
Yorba Linda, CA 92887

714.921.9095

714.921.6422 Facsimile

Service Information

Warranty Service: Please return the product in the original packaging with proof of purchase
to the below address. Clearly state in writing the performance problem and return any leads,
connectors and accessories that you are using with the device.

Non-Warranty Service: Return the product in the original packaging to the below address.
Clearly state in writing the performance problem and return any leads, connectors and
accessories that you are using with the device. Customers not on open account must include
payment in the form of a money order or credit card. For the most current repair charges
contact the factory before shipping the product.

Return all merchandise to B&K Precision Corp. with pre-paid shipping. The flat-rate repair
charge includes return shipping to locations in North America. For overnight shipments and
non-North America shipping fees contact B&K Precision Corp..

B&K Precision Corp.
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
Phone: [phone]
Facsimile: 714-921-6422
Email: [e-mail]

Include with the instrument your complete return shipping address, contact name, phone number and description of problem.

6. Safety Precaution

SAFETY CONSIDERATIONS

The Models 4090 LCR Meter has been designed and tested according to Class 1A 1B or 2 according to IEC479-1
and IEC 721-3-3, Safety requirement for Electronic Measuring Apparatus.

SAFETY PRECAUTIONS/SAFETY NOTES

The following general safety precautions must be observed during all phases of operation, service, and repair of
this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual
violates safety standards of design, manufacture, and intended use of the instrument.
The manufacturer assumes no liability for the customer‘s failure to comply with these requirements.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage is installed.

!

SAFETY SYMBOLS

Caution, risk of electric shock

Earth ground symbol
Equipment protected throughout by double insulation or

reinforced insulation
Caution (refer to accompanying documents)

!

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT

Because of the danger of introducing additional hazards, do not install substitute parts or perform any
unauthorized modification to the instrument. Return the instrument to a qualified dealer for service and repair to
ensure that safety features are maintained.

INSTRUMENTS WHICH APPEAR DAMAGED OR DEFECTIVE SHOULD NOT BE USED! PLEASE
CONTACT B&K PRECISION CORP. INCORPORATED FOR INFORMATION ON REPAIRS.

FAX: 714

-

921-6422

PN: 481-528-9-001
Printed in Taiwan
2004 B&K Precision Corp.

22820 Savi Ranch Parkway
Yorba Linda, CA 92887
USA
TEL: [phone]