B&K Precision 889B User Manual

INSTRUCTION MANUAL

v092711

Model 889B Bench LCR/ESR Meter with Component Tester

1. Introduction

1.1 General

The B&K Pr ecisio n Corp. 889B Synthesized In-Circ uit LCR/ESR M eter is a high a ccurac y test instrum ent 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 889B can not only help engineers and students to under s tand the c h arac ter ist ic s of electronics components but also being an essential tool on any service bench.

The 889B is defaulted to auto ranging. However, it can be set to auto or manual ranging by pressing the Range Hold k ey. W hen LCR m easurement m ode is selected, one of the test frequenc ies, 100 Hz, 120 H z, 1 KHz, 10 KHz, 100 KHz or 200 KHz, may be selec ted on all a pplicabl e ranges. One of the test voltages, 50m Vrms, 0.25 Vrms, 1 Vrms or 1 VDC (DCR only), m ay also be selected on all applicable ranges . The dual display feat ure permits simultaneous measur ements. When DC/AC voltage/current measurement m ode 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 889B can perform virtually all t he functions of most bench t ype LCR bridges . W ith 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 889B performs the functions of a general purpose Digital Multi-Meter and can be used to replace the DMM on a service bench.

The 889B has applications in electronic engineering labs, production facilities, service shops, and schools. It can be used to check ESR va lues of capacitors, sor t and/or select com ponents, measure unm arked and unknow n components, and measure capacitance, inductance, or resistance of cables, switches, circuit board foils, etc.

The key features are as following:

1. Voltage Measurements:

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

2. Current Measurements:

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

3. Diode/Audible Continuity Checks:

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

4. LCR Measurements:  Test conditions

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

 Measurement Parameters : Z, Ls, Lp, Cs, Cp, DCR, ESR, D, Q and θ  Basic Accuracy : 0.1%  Dual Liquid Crystal Display  Auto Range or Range Hold  USB Interface Communication  Open/Short Calibrat io n  Primary Parameters Display:

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

4

Cs : Serial Capacitance

( )

Ohm

Reactance

Resistance

Impedance

=Ω

=

−

==

+==

Ω∠=+=



 





 



S

X

R

Z

s

R

s

X

TanSinZ

s

X

s

X

s

RZCosZ

s

R

Z

s

jX

s

RZ

1

22

θθ

θ

s

X

s

R

( )

sX,RZ

s

Z

θ

Imaginary Axis

Real Axis

Figure 1.1

fCC

C

X

fLL

L

X

πω

2

11

2====

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 and AC impedances. The common digital multi-meter can only measure the DC impedance, but the 889B 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 im aginary element on t he y-axis. This im pedance meas urement plane can also be seen as the polar coordinates. The Z is the magnitude and θ is the phase of the impedance.

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

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 t he ratio of the stored ener gy (r eactance) and the d issipated energ y (resistance). Q is generally used for inductors and D for capacitors.

5

p

R

p

C

p

L

p

R

p

X

p

R

G

B

sRs

C

s

R

s

L

s

R

s

X

D

Q

ω

δ

===

=

===

==

1

tan

11

Figure 1.2

Real and imaginary componen ts are serial

ss

jXRZ +=

Real and imaginary components are parallel

G=1/R

jB=1/jX

jBGY +=

jX

R

P

jX

1

P

R

1

Y +=

There are two types of the c ircuit mode, the ser ies mode and the parallel m ode. See Figure 1 .2 to find out the relationship of the series and parallel modes.

Rs jX

s

p

1.3 Specification

 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

θ -180.0 ° to 180.0 °

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

 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

6

2. AC Voltage Measurement (True RMS):

2

1 Dx+

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 2% ±1 100Hz 120Hz 1KHz 10KHz 5% ±1  2% ±1

100KHz 200KHz



20M ~

10M

(Ω)



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

10M ~

1M

(Ω)

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

1M ~ 100K

(Ω)

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

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

if the Dx＞0.1.

1K

(Ω)

1K ~ 100

(Ω)

100 ~ 1

(Ω)

1 ~ 0.1

(Ω)



7

C Accuracy:

NA

100Hz

79.57pF |

159.1pF

159.1pF |

1.591nF

1.591nF |

15.91nF

15.91nF |

159.1uF

159.1nF |

1.591uF

1.591uF |

15.91uF

15.91uF |

1591uF

|

15.91mF

120Hz

1KHz

10KHz

100KHz



2% ± 1



66.31pF |

132.6pF

2% ± 1



7.957pF |

15.91pF

2% ± 1



0.795pF |

1.591pF

5% ± 1



NA 0.159pF

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

132.6pF

1.326nF

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

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

|

1.326nF |

13.26nF

159.1pF |

1.591nF

15.91pF |

159.1pF

1.591pF |

15.91pF

13.26nF |

132.6nF

1.591nF |

15.91nF

159.1pF |

1.591nF

15.91pF |

159.1pF

132.6nF |

1.326uF

15.91nF |

159.1nF

1.591nF |

15.91nF

159.1pF |

1.591nF

1.326uF |

13.26uF

159.1nF |

1.591uF

15.91nF |

159.1nF

1.591nF |

15.91nF

13.26uF |

1326uF

1.591uF |

159.1uF

159.1nF |

15.91uF

15.91nF |

1.591uF



1326uF

|

13.26mF 1% ± 1



159.1uF |

1.591mF 1% ± 1



15.91uF |

159.1uF

1% ± 1



1.591uF |

15.91uF

200KHz



L Accuracy:

100Hz

120Hz

1KHz

NA 0.079pF

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

31.83KH |

15.91KH

2% ± 1



26.52KH |

13.26KH

2% ± 1



3.183KH |

1.591KH

2% ± 1



15.91KH

1591H

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

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

0.795pF

|

7.957pF

1591H

|

159.1H

1326H

|

132.6H

159.1H |

15.91H

7.957pF |

79.57pF

159.1H |

15.91H

132.6H |

13.26H

15.91H |

1.591H

79.57pF |

795.7pF

15.91H |

1.591H

13.26H |

1.326H

1.591H |

159.1mH

0.1% ± 1 0.2% ± 1

795.7pF |

7.957nF

1.591H |

159.1mH

1.326H |

132.6mH

159.1mH |

15.91mH

7.957nF |

795.7nF

159.1mH |

1.591mH

132.6mH |

1.326mH

15.91mH |

159.1uH

0.5% ± 1

795.7nF |

7.957uF

1.591mH |

159.1uH 1% ± 1



1.326mH |

132.6uH 1% ± 1



159.1uH

|

15.91uH 1% ± 1



8

10KHz

NA

100K ~

318.3H |

159.1H

5% ± 1



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



100KHz



200KHz



D Accuracy:

31.83H |

15.91H

15.91H |

7.957H

|Zx|

Freq.

100Hz ±0.020  ±0.010 ±0.005 ±0.002 ±0.002 ±0.002 ±0.005 ±0.010 120Hz

1KHz

10KHz ±0.050  ±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)

1.591H |

159.1mH

795.7mH |

79.57mH

10M ~

1M

(Ω)

159.1mH

15.91mH

79.57mH

7.957mH

1M ~ 100K

(Ω)

|

10K

(Ω)

15.91mH |

1.591mH

7.957mH |

795.7uH

10K ~

1K

(Ω)

1.591mH

159.1uH

795.7uH

79.57uH

1K ~

100

(Ω)

|

100 ~ 1

(Ω)

159.1uH |

1.591uH

79.57uH |

0.795uH

1 ~ 0.1

(Ω)



1.591uH |

0.159uH

0.795uH |

0.079uH

θ Accuracy:

100KHz 200KHz



|Zx|

Freq.

100Hz ±1.046  ±0.523 ±0.261 ±0.105 ±0.105 ±0.105 ±0.261 ±0.523 120Hz

1KHz

10KHz ±2.615

100KHz 200KHz



NA ±0.050 ±0.020 ±0.010 ±0.004 ±0.010 ±0.020 ±0.050

20M ~

10M

(Ω)



NA ±2.615 ±1.046 ±0.409 ±0.209 ±0.409 ±1.046 ±2.615

10M ~

1M (Ω)

±1.046

1M ~ 100K

(Ω)

10K

(Ω)

10K ~

1K

(Ω)

1K ~

100

(Ω)

100 ~ 1

(Ω)

1 ~ 0.1

(Ω)



9

Z Accuracy:

1

2

1 Dx+

Ω=

−

⋅⋅⋅⋅

=

⋅⋅⋅

=

1590

9

10100

3

102

1

2

1

π

Cxf

Zx

LxfZx ⋅⋅⋅=

π

2

1 Dx+

Ω=

−

⋅⋅⋅=

⋅⋅⋅

=

283.6

3

10

3

102

2

π

LxfZx

As shown in table 1.

C Accuracy:

=

π

2

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 C

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

Then

CxfZx⋅⋅⋅

Ae

by

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

When Dx > 0.1, multiply L

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

by

Ae

Refer to the accuracy table, get L

= ±0.5%

Ae

10

ESR Accuracy:

100

Ae

Xx

Ae

ESR ⋅±=

Cxf

LxfXx

⋅⋅⋅

=⋅⋅⋅=

π

2

1

2

Ω=

−

⋅⋅⋅⋅

=

⋅⋅⋅

=

1590

9

10100

3

102

1

2

1

π

Cxf

Zx

Ω±=⋅±= 59.1

100

Ae

Xx

Ae

ESR

100

Ae

D ±=

Ω=

−

⋅⋅⋅⋅

=

⋅⋅⋅

=

1590

9

10100

3

102

1

2

1

π

Cxf

Zx

002.0

100

±=⋅±=

Ae

D

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

Then

Refer to the accuracy table, get

=±0.1%,

C

Ae

D Accuracy:

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

Then

Refer to the accuracy table, get

=±0.1%,

C

Ae

11

Q Accur acy :

DeQx

Ae

Q

⋅

±=

1

2

1<⋅ DeQx

Ω=

−

⋅⋅⋅=

⋅⋅⋅

=

283.6

3

10

3

102

2

π

LxfZx

005.0

100

±=⋅±=

Ae

De

1.01

2

1

2



±=⋅

⋅

±=

DeQx

Ae

Q

100

Ae

π

180

⋅=

Ae

θ

Ω=

−

⋅⋅⋅⋅

=

⋅⋅⋅

=

1590

9

10100

3

102

1

2

1

π

Cxf

Zx

deg057.0

100

1.0180

100

180

±=⋅±=

⋅±=

π

θ

Ae

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

=±0.5%,

L

Ae

If measured Qx = 20 Then

θ Accuracy:

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

Then

Refer to the accuracy table, get

=±0.1%,

Z

Ae

12

 Testing Signal:

Level Accuracy : ± 10% Frequency Accuracy : 0.1%

 Output Impedance : 100Ω ± 5%

 General:

Temperature : 0°C to 40°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 T he test frequenc y is user selec table and can be cha nged. Generall y, a 1 KHz test signal or higher is used to m easure capacitors that are 0.01uF or sm aller and a 120Hz t est signal is used f or capacito rs 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 frequ ency) circuits. This is because these k inds of inductors op erate at higher f requencies and require that they shal l be measured at a higher fr equency. Generall y, inductors with induc tances below 2mH should be measured at t est frequency of 1 KHz or h igher and inductors above 200H should be measured at 120Hz or lower.

It is best to check with the c omponent manufactur ers’ data sheet to determine the best test fr equency for the device.

Charged Capacitors Always discharge an y 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 di ssipation factor due to their normally hi gh internal leakage characteris tics. If the D (Dissipation Factor) is excessive, the capacitance measurement accuracy may be degraded.

It is best to chec k with the component manuf acturers’ data sheet t o determ ine the d esirable D valu e of a good component.

Measuring Capacitance of Cables, Sw itches or Other Parts Measuring the c apacitance of c oaxial c able s is very useful in determ ining the actual length of the cable. Most m anufacturer specifications list th e 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, spec ification calls out a certain cab le, to have a c apacitance 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 deter m ine t he capac itance per f oo t . Do n ot us e t oo s hort l en gth such as one foot, beca use any error becomes magnified in the total length calculations.

Sometimes, the affecting s tray capacitance of switches , interconnect cables, circ uit 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 f or obtaining an accurate Q reading of low Q induc tors. Where ohm ic losses are most significant, th e series equivalent m ode is preferred. However, there are cases

13

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

1.4 Accessories

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

14

2. Operation

2.1 Ph ysical Des crip tio n

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/θ/ESR Function Key 12. HPOT Terminal

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

15. Rela ti ve Key 16. HCUR Terminal

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

19. Remote Function Key

21. P ower Swit ch

23. AC Power

25. A Terminal

20. COM T erminal

22. V/Diode/Continuity Terminal

24. USB Port

26. 2A Fuse

15

2.2 Making Measurement

2.2.1 Open and Short Calibration The 889B provides open/s hort calibr ation capabil ity so the user c an get better accur acy in meas uring high and

low impedance. We recomm end that the user per form open/short calibr ation if the test leve l or frequency has been changed.

 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 889B will beep to show that the calibration is done.

 Short Calibration

To perform the short calibration, insert the Shor ting Bar into the measur ement terminals. Pr ess the Short key then the LCD will display:

This calibration takes about 15 seconds. After it is fin ished, the 889B will beep to sho w that the calibration is done.

2.2.2 Relative Mode The relative mode lets t he user to m ak e a quick sort of a bunch of c om ponents. First, insert the stand ard va lue

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 T o 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:

16

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 se lect 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 C p ( Par a llel Mod e) measurement mode. If t he s erial mode (Cs ) i s selec te d, t he 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 .

17

3. Operation Modes

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

 Normal Mode:

The Normal mode is the default operation mode when power on. It is a local mode that the 889B is controlled by the keypads and th e results of the measurement will be s ent to both LCD display and a remote USB equipped PC through the build-in USB port.

 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 USB port.

 Remote Binning Mode:

In the Remote Binning mode, the “R MT Bin” on the LCD will be lit, the o peration of 889B is control led by a remote USB equipped PC or term inal, and t he res ults of the m easur ement will be sim ultaneously se nt t o t h e local LCD display and remote workstation through the USB port.

In this mode all functional keypads except Remote button are locked. Remote Binning m ode is opened for users to design your own private, fast an d 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 889B. It is d escribed in the following figure.

Server:

Model

889B

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 889B and a remote USB equipped PC is described as follows.

1. The commands that will be sent from a remote PC to the 889B are use d 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.

18

bit position LCR DC/AC V/A

Bit 2 – Bit 0

(test freq)

Reserved

001

120 Hz

011

10K Hz

101

200K Hz

111

Reserved

Bit 4 – Bit 3

00

50 mVrms

10

1 Vrms

Bit 5

Reserved

1

Reserved

Bit 6

0

Relative

Bit 7

1

Normal

Bit 10 – Bit 8

000

Lp

010

Cp

100 Z

110

Reserved

Bit 12 – Bi t 11

Reserved

01 Q

11

ESR

Bit 16 – Bit 13

0000

RH nH

Reserved

0010

RH mH

RH V, A

0100

RH pF

0110

RH uF

1000

RH F

1010

RH K-Ohm

1100

Reserved

000 100 Hz

010 1K Hz

100 100K Hz

110 Reserved

(test level) Reserved

01 250 mVrms

11 Reserved

0 Default Default

1 Normal Normal

0 Calibration Calibration

Reserved

001 Ls

011 Cs

101 DCR

111 Reserved

00 D

10 DEG

0001 RH uH RH mV, mA

0011 RH H Reserved

0101 RH nF

0111 RH mF

1001 RH Ohm

1011 RH M-Ohm

19

1101

1110

1111

Auto-Ranging

Bit 17

Bit 21 – Bit 18

0100

Diode

0110

DCA

Bit 23 – Bit 22

00

10

02

09

M-B0

M-B1

M-B2

M-B3

S-B0

S-B1

S-B2

S-B3

CS

02

03

M-B0

M-B1

M-B2

M-B3

CS

0 Short Cal Short Cal 1 Open Cal Reserved

Measurement Modes 0000 Reserved 0001 LCR 0010 DCV 0011 ACV

0101 Continuity

0111 ACA Others Reserved

Reserved

01

11

For example: if LCR f unc tion, Cp with D measurement m ode is s elected in Aut o-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 m easurem ent that will be sent from the 889B to a r emote 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)

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)

When only secondar y readi ng (such as DCV) will be s ent, the data is packed in 11-byte format desc ribed below: Lead_code1 : 02 Lead_code2 : 09

20

Data_code : 8 bytes long; two 32-bit floating point format of the secondary reading

02

09

S-B0

S-B1

S-B2

S-B3

S-B0

S-B1

S-B2

S-B3

CS

Checksum : -((02+09+data_code) && 0x00FF)

 Remote Mode:

When in the Remote mode, the “RMT” on the LCD will be lit and the 889B is capable of communicating to remote USB equipped PC or terminal through the build-in USB 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 b e locked. And the external program through the USB port controls the operation of the 889B.

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 num er ical 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 889B. When a mode-setting command is entered the 889B will return “OK” after setting is complet e. When query comma nd is entere d, the 889B will send back the values of measurement.

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

21

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

Example: CPD (set to Cp-D me asur e ment mo de)

OK

CPD?

0.22724 0.12840 (return values)

DCR?

5.1029 (return value)

*IDN?

Query the identity of the 889B. This command is used to identify the basic information of 889B. 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. MODEL889B,123456789,4.096

*RST

Reset the 889B to the power on default status. The default status is: 1KHz 1Vrms CpD uF After the 889B 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

22

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

ASC OFF OK (return) FREQ?

CORR OPEN

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

2 (return)

CORR SHORT

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

FREQ(?) PARAMETER

Set (query) the measurement frequency.

 FREQ PARAMETER

Set the measurement frequency according to the parameter. When setting command is entered, the 889B 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)

 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.

 LEV PARAMETER

23

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

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

Example:

LEV 1V

OK

 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

24

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.

 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

 RANG?

Return the current measurement unit setting. Example:

ASC ON OK RANG? pF (return value)

25

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).

26

4. Application

R

H

CUR

H

POT

DUT

(b) BLOCK DIAGRAM

DUT

V

A

Co

o

L

o

R

o

L

o

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUR EMENT RANGE(£[)

2T

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

L

POT

L

CUR

DUT

V

A

(d) 2T CONNECTION WITH SHILDING

H

CUR

H

POT

DUT

(b) BLOCK DIAGRAM

DUT

V

A

Co

R

o

L

o

R

o

L

o

Co doesn't effect measurement result

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[)

3T

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

L

POT

L

CUR

4.1 Test Leads Connecti o n

Auto balancing bridge has four terminals (H

CUR

POT

CUR

and L

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

POT

, H

, L

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

2-Terminal is the easiest way to connect the DUT, but it contents m any 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.

Figure 4.1

 3-Terminal (3T)

3-Terminal uses c oaxial 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.

Figure 4.2

 4-Terminal (4T)

4-T er minal 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.

27

HCUR HPOT

DUT

(b) BLOCK DI AGRAM

DUT

V

A

(a) CONNECTION

(c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[)

4T

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

LPOT

LCUR

(d) WRO NG 4T CONNECTION

H

POT

DUT

(b) BLOCK DIAGRAM

(a) CONNECTION

(c) TYPICAL I MPEDANCE MEASUREMENT RANGE (£[)

5T

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

H

CUR

DUT

V

A

DUT

V

A

L

POT

L

CUR

Figure 4.3

 5-Terminal (5T)

5-Terminal connect ion 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.

 4-Terminal Path (4TP)

4-T erminal 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 t he shiel d. Ther efor e, the m agnetic f lux that g enera ted b y interna l conduc tor will cancel out the m agnetic flux generated by extern al conductor (shield). The 4TP conn ection increases the measurement range from 1mΩ to 10MΩ.

Figure 4.4

28

(b) BLOCK DIAGRAM

(a) CONNECTION

DUT

V

A

(c) TYPICAL IMPEDANC E

MEASUREMENT RANGE(£[)

4T

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

H

POT

DUT

H

CUR

L

CUR

L

POT

H

POT

DUT

H

CUR

L

CUR

L

POT

(d) 4T CONNECTION WITH SHILDING

(a) Parastic Effect

H

CUR

HPOT

LPOT LCUR

Cd

Connection

Point

DUT

C

h C

l

Ground

(b) Guard Plant reduces

Parastic Effect

HCUR

HPOT LPOT

L

CUR

Guard

Plant

Figure 4.5

 Eliminating the Effect of the Parasitic Capacitor

When measuring the high impedance com ponent (i.e. low capacitor), the parasitic capacitor becom es an important issue (Figure 4.6). In f igure 4.6(a) , the parasi tic capacitor C d is parallel ed 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.

4.2 Open/Short Compensation

For those precision im pedance-measuring instrum ents, the open and short compens ation need to be used to reduce the parasitic effect of the tes t f ixtur e. The parasitic effect of the test f ixtur e c an be trea ted like the simple passive components in figur e 4.7(a). When the DUT is open, the instrum ent 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 889B has Yp and Zs that can then be used for the real Zdut calculation (Figure 4.7(d)).

Figure 4.6

29

H

CUR

H

POT

L

CUR

L

POT

Zdut

C

o

R

s

L

s

G

o

Z

m

Redundant Impedance

(Z

s

)

Parastic Conductance

(Y

o

)

Parastic of the Test Fixture

(a) Parastic Effect of the Test Fixture

HCUR

HPOT

LCUR

LPOT

C

o

R

s

L

s

G

o

(b) OPEN Measurement

Y

o

OPEN

Y

o = Go + j£sCo

1 (Rs + j£s<< ) Go+j£sCo

H

CUR

H

POT

L

CUR

L

POT

C

o

R

s

L

s

G

o

(c) SHORT Measurement

Z

s

SHORT

Z

s

= R

s

+ j£sL

s

Z

m

Y

o

Zdut

Zm - Z

s

Zdut = 1-(Z

m

-Zs)Y

o

(d) Compensation Equation

Z

s

4.3 Selecting the Series or Parallel Mode

Figure 4.7

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.

 Capacitor

The impedance and capacitance in the capacitor are negatively proportional. Therefore, the larger capacitance means the low er im pedance, the s m aller capacitance m eans the hi gher im pedance. F igure 4.8 shows the equivalent circui t 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. He nce, it is properly to use parallel mode for low capacitance measurement and series mode for high capacitance measurement.

30

R

C

R

Effect

R

P

C

R

Effect

Figure 4.9

R

P

L

R

Effect

R

P

L

R

Effect

Small capacitor (High impedance)

Large capacitor (Low impedance)

P

S

No Effect

S

 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 induc tance is small, the Rs becom es more important than the R p. When the inductance is large, the Rp s houl d be taking into considerati on. T her ef ore, 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)

Small inductor (Low impedance)

No Effect

S

No Effect

S

31

5. Limited THREE-Year Warranty

B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of th ree yea rs

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 of a sales receipt.

To obtain warranty coverage in the U.S.A., this product must be registered by completing a warranty registration form on our website

Exclusions: This warranty does not apply i n the event of misus e or abuse of the produc t or as a result of unauthorized alterations or repairs. The warranty is void if the serial number is altered, 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 limitations 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.

www.bkprecision.com within fifteen (15) days of purchase.

from date of purchase.

B&K Precision Corp. 22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com 714-921-9095

B&K Precision 889B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

1. Introduction

1.1 General

1.2 Impedance Parameters

1.3 Specification

Considerations

1.4 Accessories

2. Operation

2.1 Ph ysical Des crip tio n

2.2 Making Measurement

2.2.1 Open and Short Calibration The 889B provides open/s hort calibr ation capabil ity so the user c an get better accur acy in meas uring high and

2.2.2 Relative Mode The relative mode lets t he user to m ak e a quick sort of a bunch of c om ponents. First, insert the stand ard va lue

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

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

2.2.5 AC Impedance Measurement

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

2.2.7 Inductance Measurement

3. Operation Modes

3.1 Remote Mode Command Syntax

3.2 Remote Mode Commands

4. Application

4.1 Test Leads Connecti o n

4.2 Open/Short Compensation

4.3 Selecting the Series or Parallel Mode

5. Limited THREE-Year Warranty