INSTRUCTION MANUAL Model 889B Bench LCR/ESR Meter with Component Tester
Contents 1. INTRODUCTION ...................................................................................................................................................................... 3 1.1 GENERAL .................................................................................................................................................................................................3 1.2 IMPEDANCE PARAMETERS .....................................................................................
1. Introduction 1.1 General The B&K Precision Corp. 889B 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 889B can not only help engineers and students to understand the characteristics of electronics components but also being an essential tool on any service bench.
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 and AC impedances.
1 1 D tan Xs Ls 1 Rs Rs C s Rs B G Rp Rp C p R p L p X p Q 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. Real and imaginary components are parallel Real and imaginary components are serial Rs Rp jXs Z Rs jX s G=1/Rp jXp Y 1 1 RP jX P jB=1/jXp Y G jB Figure 1.2 1.3 Specification Measuring Range: Parameter Range Z 0.000 to 500.0 M L 0.
2. AC Voltage Measurement (True RMS): 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.
C Accuracy: 100Hz 120Hz 79.57pF 159.1pF 1.591nF 15.91nF 159.1nF 1.591uF 15.91uF 1591uF | 159.1pF | 1.591nF | | | | | | 15.91nF 159.1uF 1.591uF 15.91uF 1591uF 15.91mF 2% 1 1% 1 0.5% 1 0.2% 1 0.1% 1 0.2% 1 0.5% 1 1% 1 66.31pF 132.6pF 1.326nF 13.26nF 132.6nF 1.326uF 13.26uF 1326uF | | | | | | | | 132.6pF 1.326nF 1% 1 13.26nF 0.5% 1 132.6nF 0.2% 1 1.326uF 0.1% 1 13.26uF 0.2% 1 1326uF 0.5% 1 13.26mF 7.957pF 15.91pF 159.
318.3H 10KHz 159.1H 1.591H 15.91H 159.1mH 15.91mH 1.591mH | | | | | | | | 159.1H 15.91H 2% 1 1.591H 0.5% 1 159.1mH 0.2% 1 15.91mH 0.1% 1 1.591mH 0.2% 1 15.91uH 0.5% 1 1.591uH 5% 1 1% 1 31.83H 15.91H 1.591H 159.1mH 15.91mH 1.591mH 159.1uH 1.591uH 100KHz | | | | | | | | 15.91H NA 1.591H 5% 1 159.1mH 2% 1 15.91mH 1% 1 1.591mH 0.4% 1 159.1uH 1% 1 1.591uH 2% 1 0.159uH 5% 1 15.91H 7.957H 795.7mH 79.57mH 7.957mH 795.7uH 79.
Z Accuracy: As shown in table 1. C Accuracy: Zx 1 2 f Cx CAe = Ae of C f : Test Frequency (Hz) Cx : Measured Capacitance Value (F) |Zx| : Measured Impedance Value () Accuracy applies when Dx (measured D value) 0.1 When Dx > 0.1, multiply CAe by Example: Test Condition: Frequency : Level : DUT : 1 Dx 2 1KHz 1Vrms 100nF Then 1 2 f Cx 1 1590 3 2 10 100 10 9 Zx Refer to the accuracy table, get CAe=±0.
ESR Accuracy: ESR Ae Xx Ae 100 Xx 2 f Lx ESRAe = Ae of ESR f : Test Frequency (Hz) Xx : Measured Reactance Value () 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 1 2 f Cx 1 1590 3 2 10 100 10 9 Zx Refer to the accuracy table, get CAe=±0.1%, ESR Ae Xx Ae 1.
Q Accuracy: Q Ae Qx 2 De 1 Qx De QAe = Ae of Q measurement value Qx : Measured Quality Factor Value De : Relative D Accuracy Accuracy applies when Qx De 1 Example: Test Condition: Frequency : 1KHz Level : 1Vrms DUT : 1mH Then Zx 2 f Lx 2 10 3 10 3 6 . 283 Refer to the accuracy table, get LAe=±0.5%, De Ae 0 . 005 100 If measured Qx = 20 Then Q Ae Qx 2 De 1 Qx De 2 1 0 .
Testing Signal: Level Accuracy Frequency Accuracy Output Impedance General: Temperature Relative Humidity AC Power Dimensions Weight : 10% : 0.1% : 100 5% : 0°C to 40°C (Operating) -20°C to 70°C (Storage) : Up to 85% : 110/220V, 60/50Hz : 300mm x 220mm x 150mm (L x W x H) 11.8” x 8.7” x 5.9” : 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.
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.
2. Operation 2.1 Physical Description 14 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. Relative Key 16. HCUR Terminal 17. Short Calibration Key 18. Diode/Continuity Function Key 19. 21. 23. 25. 20.
2.2 Making Measurement 2.2.1 Open and Short Calibration The 889B 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. 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.
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.
3. Operation Modes There are four operation modes in the 889B. They are Normal, Binning, Remote and Remote Binning 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 the results of the measurement will be sent to both LCD display and a remote USB equipped PC through the build-in USB port.
18 bit position LCR DC/AC V/A Bit 2 – Bit 0 000 001 010 011 100 101 110 111 Bit 4 – Bit 3 00 01 10 11 Bit 5 0 1 Bit 6 0 1 Bit 7 0 1 Bit 10 – Bit 8 000 001 010 011 100 101 110 111 Bit 12 – Bit 11 00 01 10 11 Bit 16 – Bit 13 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 (test freq) 100 Hz 120 Hz 1K Hz 10K Hz 100K Hz 200K Hz Reserved Reserved (test level) 50 mVrms 250 mVrms 1 Vrms Reserved Reserved Default Reserved Reserved Default Reserved Relative Normal Relative Normal Calibrati
1101 1110 1111 Bit 17 0 1 Bit 21 – Bit 18 0000 0001 0010 0011 0100 0101 0110 0111 Others Bit 23 – Bit 22 00 01 10 11 Auto-Ranging Auto-Ranging Short Cal Open Cal Short Cal Reserved Measurement Modes Reserved LCR DCV ACV Diode Continuity DCA ACA Reserved Reserved 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.
Data_code Checksum : 8 bytes long; two 32-bit floating point format of the secondary reading : -((02+09+data_code) && 0x00FF) 02 09 S-B0 S-B1 S-B2 S-B3 S-B0 S-B1 S-B2 S-B3 CS 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.
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.
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 889B to do the open calibration. After the calibration is done, the 889B will return the “OK” string back. 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.
Set the measurement level according to the parameter. When setting is done the 889B will return “OK” string. PARAMETER: ASCII string 1VDC 1Vrms 250mVrms 50mVrms Numerical code 0 1 2 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. 2. 3. 4. 5.
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 pF nF uF mF F nH uH mH H KH mOhm Ohm KOhm MOhm mV V mA A Numerical code 0 1 2 3 4 8 9 10 11 12 17 18 19 20 21 22 23 24 Example: RANG pF OK RANG? Return the current measurement unit setting.
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 4.1 Test Leads Connection Auto balancing bridge has four terminals (HCUR, HPOT, LCUR and LPOT) to connect to the device under test (DUT). 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 many errors that are the inductance and resistance as well as the parasitic capacitance of the test leads (Figure 4.1).
A HCUR HPOT DUT V DUT LPOT LCUR (a) CONNECTION (b) BLOCK DIAGRAM 4T 1m 10m 100m 1 10 100 1K 10K 100K 1M 10M (c) TYPICAL IMPEDANCE MEASUREMENT RANGE (£[) Figure 4.3 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 10m to 10M.
HCUR V HPOT DUT DUT LPOT LCUR A (a) CONNECTION (b) BLOCK DIAGRAM HCUR HPOT 4T DUT LPOT 1m 10m100m 1 10 100 1K 10K 100K 1M 10M (c) TYPICAL IMPEDANCE MEASUREMENT RANGE(£[) LCUR (d) 4T CONNECTION WITH SHILDING Figure 4.5 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.
Parastic of the Test Fixture Redundant (Zs) Impedance HCUR Rs Parastic (Yo) Conductance Ls HPOT Zm LPOT LCUR Zdut Go Co (a) Parastic Effect of the Test Fixture HCUR Rs Ls HPOT Yo Co LPOT Go OPEN Yo = Go + j£sCo 1 (Rs + j£s<< ) G o+j£sCo LCUR (b) OPEN Measurement HCUR Rs Ls HPOT Zs Co LPOT LCUR Go SHORT Zs = Rs + j£sLs (c) SHORT Measurement Zs Zm Yo Zdut Zdut = Zm - Zs 1-(Zm-Zs)Yo (d) Compensation Equation Figure 4.7 4.
Small capacitor (High impedance) C RP Large capacitor (Low impedance) RP C No Effect Effect RS RS No Effect Effect 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.
5. Limited ONE-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 one year from date 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 of a sales receipt. To obtain warranty coverage in the U.S.A.
Service Information Warranty Service: Please go the service and support section on our website www.bkprecision.com to obtain a RMA #. Return the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device. Non-Warranty Service: Please go the service and support section on our website www.bkprecision.com to obtain a RMA #.
6. Safety Precaution SAFETY CONSIDERATIONS The Models 889B 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.
PN: 481-528-9-001B Printed in Taiwan 2009 B&K Precision Corp.
