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B+K precision 885 Instruction Manual

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Instruction Manual
Manual de Instrucción
LCR METER
Models 885 & 886
MEDIDOR LCR
Modelos 885 & 886

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Summary of Contents for B+K precision 885

  • Page 1 Instruction Manual Manual de Instrucción LCR METER Models 885 & 886 MEDIDOR LCR Modelos 885 & 886...

  • Page 2: Table Of Contents

    Contents INTRODUCTION............. 1 1.1. GENERAL ............. 1 1.2. IMPEDANCE PARAMETERS ..... 3 1.3. SPECIFICATION ........... 6 1.4. ACCESSORIES ........... 20 OPERATION............21 2.1. PHYSICAL DESCRIPTION ....... 21 2.2. MAKING MEASUREMENT ...... 22 2.2.1. Battery Replacement......22 2.2.2. Battery Recharging/AC operation..23 2.2.3.

  • Page 3: Introduction

    Components can be measured in the series or parallel mode as desired; the more standard method is automatically selected first but can be overridden. The Model 885 and 886 offers three useful modes for sorting components. The highly versatile Models can perform virtually all the functions of most bench type LCR bridges.
  • Page 4 more expensive LCR bridge in many situations. The meter is powered from two AA Batteries and is supplied with an AC to DC charging adapter and two AA Ni-Mh Rechargeable Batteries. The instrument has applications in electronic engineering labs, production facilities, service shops, and schools. It can be used to check ESR values of capacitors, sort values, select precision values, measure unmarked and unknown inductors, capacitors or resistors, and to measure capacitance, inductance, or resistance of cables,...

  • Page 5: Impedance Parameters

    DC impedance and AC impedance. The common digital multi-meter can only measure the DC impedance, but the Model 885 can do both. It is a very important issue to understand the impedance parameters of the electronic component.
  • Page 6 Imaginary Axis θ Real Axis Figure 1.1 θ ∠ Ω θ ⎛ ⎞ θ θ ⎜ ⎜ ⎟ ⎟ − ⎝ ⎠ Impedance Resistance Reactance Ω There are two different types of reactance: Inductive (X ) and Capacitive (X ). It can be defined as follows: ω...
  • Page 7 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.

  • Page 8: Specification

    Real and imaginary components are serial Real and imaginary components are Parallel G=1/R jB=1/jX Figure 1.2 Specification LCD Display Range: Parameter Range 0.000Ω to 9999MΩ 0.000µH to 9999H 0.000pF to 9999F 0.000Ω to 9999MΩ 0.000Ω to 9999Ω 0.000 to 9999 0.000 to 9999 -180.0°...
  • Page 9 Accuracy (Ae): Z Accuracy: |Zx| 20M ~ 10M ~ 1M ~ 100K ~ 10 ~ 1 1 ~ 0.1 100K Freq. (Ω) (Ω) (Ω) (Ω) (Ω) (Ω) 2% ±1 1% ±1 0 5% ±1 0 2% ±1 0 5% ±1 1% ±1 100Hz 120Hz 1KHz...
  • Page 10 C Accuracy : 79 57 159 1 1 591 15 91 159 1 1591 pF | 100Hz 159 1 1 591 15 91 159 1 1591 15 91 2% ± 1 1% ± 1 1% ± 1 0 5% 0 2% 0 5% ±...
  • Page 11 L Accuracy : 31 83 15 91 1591 159 1 15 91 1 591 100Hz 15 91 1591 159 1 15 91 1 591 159 1 2% ± 1 1% ± 1 1% ± 1 0 5% 0 2% 0 5% ±...
  • Page 12 D Accuracy : |Zx| 20M ~ 10M ~ 1M ~ 100K ~ 10 ~ 1 1 ~ 0 1 100K Freq (Ω) (Ω) (Ω) (Ω) (Ω) (Ω) ±0 020 ±0 010 ±0 005 ±0 002 ±0 005 ±0 010 100Hz 120Hz 1KHz ±0 050...
  • Page 13 Z Accuracy: As shown in table 1. C Accuracy: π ⋅ ⋅ ⋅ = Ae of |Zx| : Test Frequency (Hz) Cx : Measured Capacitance Value (F) |Zx| : Measured Impedance Value (Ω) Accuracy applies when Dx (measured D value) ≦ 0.1 When Dx >...
  • Page 14 L Accuracy: π ⋅ ⋅ ⋅ = Ae of |Zx| : 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 1 Dx Example: Test Condition:...
  • Page 15 ± ⋅ π ⋅ ⋅ ⋅ π ⋅ ⋅ ⋅ = Ae of |Zx| : 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...
  • Page 16 D Accuracy: ± = Ae of |Zx| Accuracy applies when Dx (measured D value) ≦ 0.1 When Dx > 0.1, multiply Dx by (1+Dx) Example: Test Condition: Frequency : 1KHz Level : 1Vrms Speed : Slow : 100nF Then π ⋅...
  • Page 17 = Ae of |Zx| Qx : Measured Quality Factor Value De : Relative D Accuracy Accuracy applies when ⋅ De < Example: Test Condition: Frequency : 1KHz Level : 1Vrms Speed : Slow : 1mH Then π ⋅ ⋅ ⋅ −...
  • Page 18 θ Accuracy: θ ⋅ π Example: Test Condition: Frequency : 1KHz Level : 1Vrms Speed : Slow : 100nF Then π ⋅ ⋅ ⋅ Ω 1590 − π ⋅ ⋅ ⋅ ⋅ Refer to the accuracy table, get =±0.2%, θ ±...
  • Page 19 Measuring Speed: Fast 4.5 meas. / sec. Slow : 2.5 meas. / sec. General: Temperature : 0°C to 70°C (Operating) -20°C to 70°C (Storage) Relative Humidity : Up to 85% Battery Type : 2 AA size Ni-Mh or Alkaline Battery Charge : Constant current 150mA approximately Battery Operating Time : 2.5 Hours typical...
  • Page 20 at higher frequencies and require that they be measured at a higher frequency of 1 KHz. Generally, inductors below 2mH should be measured at 1 kHz and inductors above 200H should be measured at 120Hz. It is best to check with the component manufacturers’ data sheet to determine the best test frequency for the device.
  • Page 21 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 1.000 nF is displayed. Dividing 1000pF (1.000 nF) by 10 pF per foot yields the length of the cable to be approximately 100 feet.

  • Page 22: Accessories

    1.4 Accessories Operating Manual 1 pc 2 AA Size Ni-Mh Rechargeable Batteries 2 pc Shorting Bar 1 pc AC to DC Adapter 1 pc TL885A SMD Test Probe 1 pc TL885B 4-Wire Test Clip (Optional) TL08C Kelvin Clip (Optional) Carrying Case (Optional)

  • Page 23: Operation

    2. Operation 2.1 Physical Description 1. Infrared Port 2. Primary Parameter Display 3. Secondary Parameter Display 4. Low Battery Indicator 5. Model Number 6. Power Switch 7. Relative Key 8. Measurement Level Key 9. Open/Short Calibration Key 10. Measurement Frequency Key 12.

  • Page 24: Making Measurement

    2.2 Making Measurement 2.2.1 Battery Replacement When the LOW BATTERY INDICATOR lights up during normal operation, the batteries in the Models 885 & 886 should be replaced or recharged to maintain proper operation. Please perform the following steps to change the batteries: 1.

  • Page 25: Battery Recharging/Ac Operation

    To power the Model 885 with AC source, make sure that the Models 885 or 886 is off, then plug one end of the AC to DC adapter into the DC jack on the right side of the instrument and the other end into an AC outlet.

  • Page 26: Open And Short Calibration

    CAL key shortly (no more than two second), the LCD will display: This calibration takes about 10 seconds. After it is finished, the Model 885 will beep to show that the calibration is done. Short Calibration To perform the short calibration, insert the Shorting Bar into the measurement terminals.

  • Page 27: Display Speed

    2.2.4 Display Speed The Models 885 & 886 provides two different display speeds (Fast/Slow). It is controlled by the Speed key. When the speed is set to fast, the display will update 4.5 readings every second. When the speed is set to slow, it’s only 2.5 readings per second.

  • Page 28: Dc Resistance Measurement

    2.2.7 DC Resistance Measurement The DC resistance measurement measures the resistance of an unknown component by 1VDC. Select the L/C/Z/DCR key to make the DCR measurement. The LCD display: 2.2.8 AC Impedance Measurement The AC impedance measurement measures the Z of an unknown device.

  • Page 29: Inductance Measurement

    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 by selected by pressing the Level key and Frequency key, respectively. 2.2.10 Inductance Measurement Select the L/C/Z/DCR key to Ls or Lp mode for measuring the inductance in serial mode or parallel mode.

  • Page 30: Accessory Operation

    2.3 Accessory Operation Follow the figures below to attach the test probes for making measurement. Shorting Bar TL885A SMD Test Probe...
  • Page 31 TL885B 4-Wire Test Clip TL08C Kelvin Clip...

  • Page 32: Infrared Operaion

    Normal keys to switch back to local operation from Remote or Remote Binning modes. Remote: In the Remote mode, the Models 885 & 886 is capable of communicating to infrared equipped PC or terminal through the build-in infrared interface. The connection setting is as follow:...

  • Page 33: Command Syntax

    3.1 Command Syntax The command syntax of Models 885 & 886 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.

  • Page 34: Commands

    “OK” follows the ASCII CR (0DH) and ASCII LF (0AH) after setting is complete. When query command is entered, the Model 885/886 will send back the values of measurement. After a command is entered, the meter shall respond within 2.5 seconds with the return values follow the ASCII CR and ASCII LF.
  • Page 35 measurement mode setting or querying command. Parallel inductance and quality factor measurement LpQ(?) mode setting or querying command. Parallel inductance and dissipation factor LpD(?) measurement mode setting or querying command. Serial inductance and serial resistance measurement LsRs(?) mode setting or querying command. Serial inductance and quality factor measurement LsQ(?) mode setting or querying command.
  • Page 36 1KHz 1Vrms SLOW CpD uF mH Ohm After the Models 885 & 886 is reset, it will beep once and returns the “BEEP” string back. Set the format of the return value. This command sets the ASCII string return or the numerical code.
  • Page 37 FREQ(?) PARAMETER Set (queries) the measurement frequency. FREQ PARAMETER Set the measurement frequency according to the parameter. There is no return value. PARAMETER: ASCII string Numerical code 100Hz 120Hz 1KHz 10KHz 100KHz Example: FREQ 100KHz FREQ? Return the current measurement frequency setting. Example: ASC ON FREQ?
  • Page 38 PARAMETER: ASCII string Numerical code 1VDC 1Vrms 250mVrms 50mVrms Example: LEV 1V LEV? Return the current measurement level setting. Example: ASC ON LEV? 1Vrms (return value) ASC OFF LEV? 1 (return value) MODE? Query the measurement mode. Six fields will be returned. 1.
  • Page 39 Example: ASC ON MODE? 1KHz 1Vrms SLOW CpD uF (return value) ASC ON CPRP MODE? 1KHz 1Vrms SLOW CpRp uF Ohm (return value) RANG(?) PARAMETER Set (queries) the measurement unit. RANG PARAMETER Set the measurement unit according to the parameter. There is no return value.
  • Page 40 RANG? Return the current measurement unit setting. Example: ASC ON RANG? pF (return value) ASC OFF 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: READ? 0.22724 0.12840 (return value)
  • Page 41 SPEED(?) PARAMETER Set (queries) the measurement speed. SPEED PARAMETER Sets the measurement speed according to the parameter. There is no return value. PARAMETER: ASCII string Numerical code SLOW FAST Example: SPEED FAST SPEED? Return the current measurement speed setting. Example: ASC ON SPEED? SLOW (return value)

  • Page 42: Aplication

    4. Application 4.1 Test Leads Connection Auto balancing bridge has four terminals (H ) 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 which are the inductor and resistor as well as the parasitic capacitor of the test leads (Figure 3.1).
  • Page 43 3-Terminal (3T) 3-Terminal uses coaxial cable to reduce the effect of the parasitic capacitor (Figure 3.2). The shield of the coaxial cable should connect to guard of the instrument to increase the measurement range up to 10MΩ. Co doesn't effect measurement result (a) CONNECTION...
  • Page 44 4-Terminal (4T) 4-Terminal connection reduces the effect of the test lead resistance (Figure 3.3). This connection can improve the measurement range down to 10mΩ. However, the effect of the test lead inductance can’t be eliminated. (a) CONNECTION (b) BLOCK DIAGRAM 1m 10m 100m 1 1K 10K 100K 1M (c) TYPICAL MPEDANCE MEASUREMENT RANGE (£[)
  • Page 45 (a) CONNECTION (b) BLOCK DIAGRAM 1m 10m 100m 1 1K 10K 100K 1M (c) TYPICAL MPEDANCE MEASUREMENT RANGE (£[) (d) WRONG 4T CONNECTION Figure 3.4 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 3.5).
  • Page 46 external conductor (shield). The 4TP connection increases the measurement range from 1mΩ to 10MΩ. (a) CONNECTION (b) BLOCK DIAGRAM 1m 10m100m 1 1K 10K 100K 1M (c) TYPICAL IMPEDANCE (d) 4T CONNECTION WITH SH LDING MEASUREMENT RANGE(£[) Figure 3.5 Eliminating the Effect of the Parasitic Capacitor When measuring the high impedance component (i.e.

  • Page 47: Open/Short Compensation

    Guard Plant Connection Point Ground (b) Guard Plant reduces (a) Parastic Effect Parastic Effect Figure 3.6 4.2 Open/Short Compensation For those precision impedance measuring instrument, the open and short compensation need to be used to reduce the parasitic effect of the test fixture.
  • Page 48 Parastic of the Test Fixture Redundant Parastic Impedance Conductance Zdut (a) Parastic Effect of the Test Fixture OPEN + j£sC + j£s<< +j£sC (b) OPEN Measurement SHORT + j£sL (c) SHORT Measurement Figure 3.7...

  • Page 49: Limited One-Year Warranty

    Zdut Zdut = 1-(Z (d) Compensation Equation Figure 3.7 (Continued) 4.3 Selecting the Series or Parallel Mode According to different measuring requirement, there are series and parallel modes to describe the measurement result. It is depending on the high or low impedance value to decide what mode to be used.
  • Page 50 Small capacitor Large capacitor (Low impedance) (High impedance) No Effect Effect Effect No Effect Figure 3.8 Inductor The impedance and inductive in the inductor are positively proportional. Therefore, the large inductor equals to the high impedance and vice versa. Figure 3.9 shows the equivalent circuit of inductor.
  • Page 51 Small inductor Large inductor (Low impedance) (High impedance) No Effect Effect Effect No Effect Figure 3.9...
  • Page 52 B&K Precision Corporation 22820 Savi Ranch Parkway Yorba Linda, California 92887 www.bkprecision.com ©2005 B&K Precision Corporation Made in Taiwan 481-304-9-001...

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