TH2821B Portable LCR Meter
Contents
1. Secondary parameter accuracy D A 3 when D lt 0 1 D A 1 D 3 when D gt 0 1 D Q Qx x D when Q De lt 1 1FQ xD 1 4 Environment Requirements 1 Please do not operate TH2821B under the following environment conditions as any of them will directly affect measuring precision or damage the meter Please do not operate the instrument in places where is dusty vibrant under direct sunlight or where there is corrosive air e Although TH2821B has been specially designed for reducing the noise caused by AC power the environment with low noise is still recommended If this can not be arranged please make sure to use power filter for the AC DC adaptor The TH2821B must be operated under the following environment conditions Temperature 0 C 40 C Humidity lt 90 RH at 40 C Storage Temperature 25 C 50 C 10 TH2821B OPERATION MANUAL Chapter 2 Panel Illustration 2 1 LCD Display Illustration 12345 6 7 4 L C R Z Figure 2 1 LCD Display 11 TH2821B OPERATION MANUAL No Description No Description Battery Power E 1 indicator 8 Unit Indicator Remote i 2 indicator 9 Ranging Mode Indicator 3 Beeper 10 Primary Parameter Indicator Display Series Parallel 4 Indicator 11 Frequency Indicator 5 Comparator 12 Primary Parameter Indicator Indicator Secondary 6 Parameter 13 2 Function Indicator Indica2. instrument Quit will be displayed in the secondary parameter display area 6 Equivalent Circuit Press EQU key to select the Series or Parallel circuit mode d Note 1 The actual C R and L are not the ideal pure C R and L Normally an actual component can be regarded as the combination of an ideal resistor and an ideal reactor in series or parallel circuit mode TH2821B can convert between the two different equivalent circuit modes using the following equations The measurement values of the two different circuit modes maybe different under different quality factor Q or dissipation factor D Capacitance Cp from parallel to series Cp Circuit Mode Ap Dissipation 1 EM 24C R Q 19 TH2821B OPERATION MANUAL Series C 1 D C R R D D Capacitance Cs from series to parallel Circuit Mode CS fs issipation 1 Dissipation DIRCI Q Parallel C 1 1 D C R R 1 D D Inductance Lp from parallel to series TEST Circuit Mode Rp Dissipation poel R OQ Series L 1 1 D L R R D 1 D Inductance Ls from series to parallel NN Circuit Mode Lp Rp Dissipation Rs 1 24 O 20 TH2821B OPERATION MANUAL Parallel Lp 1 D R R 1 D D Here parameter with subscript s means the series mode parameter with subscript p means the parallel mode 3 From the above equations we can conclude that the conversion between series
3. may leak into the cabinet and cause damage Do not use chemicals containing benzine alcohol or aromatic hydrocarbons 22 TH2821B OPERATION MANUAL Appendix Message Code Table ELEA Clear Correction OPEN Open Open correction Short Short Short correction PI Pl High limit of P1 Bin PI Pl Low limit of P1Bin nb NG No Good q Q Low limit of quality factor d D High limit of dissipation factor Std Std Standard value Nominal value APD APO Auto Power Off CAL CAL Accuracy Calibration PSd PSD Password AE Alert on ON DEF OFF PASS Pass FRIL Fail dut Quit First Edition2006 2 23
4. the measurement range is fixed at cu be displayed if th current effective m rrent range Overload symbol will e impedance under test exceeds the easurement range or display range Range Range No Resistor 100kQ Table 4 2 Ranges 16 TH2821B OPERATION MANUAL d Note How to calculate the measurement range Example Assume capacitance C 210pF dissipation D 0 0010 and test frequency f 1 kHz Solution 1 PAG 1 1 Z 5 75790 25fC 2x3 1416x1000 lt 210x107 From the Table 4 2 we can get the correct measurement range is No 2 Zy R 4 Data Hold Press DH key to freeze the display press DH key again to release ul Correction Function Press CLEAR key to select the second function SHIFT will be lighted on the screen Press CLEAR key to enter the correction function the following information will be displayed on the screen Moca wu UFEN Hz 0 TT 713 10 o Figure 4 2 Correction Display e ttER Clear is displayed in the primary parameter display area OPE OPEN Short Short or 9u Quit 17 TH2821B OPERATION MANUAL will be displayed in the secondary parameter display area d Note OPEN OPEN Short Short and 9u t Quit are selected and displayed automatically by the meter according to the impedance value of the device under test Press any key to cancel the correction op
5. TH2821B Portable LCR Meter OPERATION MANUAL English February 2006 1 Edition Rev 1 0 0 Copyright 2006 Changzhou Tonghui Electronic Co Ltd All rights reserved TH2821B OPERATION MANUAL Contents Contents rt e iaia 2 How to Contact Us 3 Incoming Inspection rere eee 4 Notes on Use m ain anne 5 Warranty iniiai nna aa tia 6 Chapter 1 Overview 7 1 1 IntrodUctlOra cuc ce annee 7 1 2 Main FUNCTIONS ccc 7 1 3 Specifications 8 1 4 Environment Requirements 10 Chapter 2 Panel Illustration 11 2 1 LCD Display Illustration 11 2 2 Keyboard Illustration 13 Chapter 3 Operation 14 3 E POWE ON cioe eror bec eee 14 3 2 How to operate eee eeeeeeee renee 15 3 2 1 Key Functions ccecce 15 3 3 Battery Replacement sssss 21 3 4 Clearing Instruction cecce 22 Appendix soe o ra cres ilies Pv Pere er ves es 23 TH2821B OPERATION MANUAL How to Contact Us Changzhou Tonghui Electronic Co Ltd Address No 3 Tianshan Road New District Changzhou Jiangsu China Tel 0086 519 5132222 5113342 5109592 Fax 0086 519 5109972 http www tonghui com cn http www tonghui cn Email sales tonghui com cn TH2821B OPERATION MANUAL Incoming Inspection Inspect the shipping container for damage The contents of the shipment should be listed as follows If the contents are incomplete if there is damage or defect p
6. and parallel is determined by D or Q Q 1 D The value of D or Q directly determined the parameter values in different circuit mode Example Three capacitors have the same series capacitance Cs 0 1uF but their dissipations are different with each other D1 0 0100 D2 0 1000 D3 1 0000 According to the above equation we can get their capacitance in parallel mode Cpl 0 09999 uF Cp2 0 09901 uF Cp3 0 05000 uF We can find that Cs is almost the same with Cp when D is very small D lt 0 01 but when D is more than 0 01 Cp and Cs are different obviously For example When D 0 1 the difference is 1 but when D 1 the difference is almost 50 3 3 Battery Replacement d Note The instrument will not be started when the battery is weakening Replace the battery immediately Loosen the three screws with suitable driver and 21 TH2821B OPERATION MANUAL remove the bottom cover Replace the degraded battery with a new DC 9V battery Model 1604 006P or other equivalent battery must be used Alkaline battery is recommended eo lf the instrument is not in use for more than three months if the external DC adapter is always be used please take out the battery Close the bottom cover The degraded battery must be disposed of properly 3 4 Clearing Instruction To clean the instrument use a soft cloth slightly dipped in water Do not spray cleanser directly onto the instrument since it
7. easurement parameter combinations L Q C D R Q and Z Q Units Description uH mH H pF nF uF Q kQ MO Table 4 1 Units Z is the absolute value of impedance Measurement value of L C or R may be positive or negative Negative capacitance value means that the device under test is actually an inductor also negative inductance value means that the device under test is actually a capacitor In theory R should be positive constantly under some condition R may be negative due to over zero correction Please carry out correct zero correction The maximum number of display digits is 5 but 5 digit is not always available and 4 digit is displayed sometimes The conversion is described in the following description From 4 digit to 5 digit When the first 2 digit of current value is less than 18 From 5 digit to 4 digit When the first 2 digit of current value is more than 20 2 Frequency Setup Use FREQ key to select the following test frequencies in turn 100 Hz 120 Hz and 1 kHz 15 TH2821B OPERATION MANUAL uy Range Setup RANGE and AUTO range AUTO key keys are used to set the measurement toggles ranging mode between Auto and Hold RANGE keys are used to increase or decrease the measurement range if the current ranging mode is Auto then the ranging mode is changed to Hold at the same time d Note When ranging mode is set to HOLD
8. eration and return to the measurement state Press CLEAR key to start the correction measurement When correction measurement is finished PASS or FAIL will be displayed on the screen see Figure 4 3 ODC E vw PRA 00 Hz 0 Figure 4 3 Open correction Passed d Note 1 The correction function must be used for accurate measurement The correction function can eliminate the stray admittance capacitance and inductance and the residual impedance resistance and reactance induced by test fixture test leads and instrument itself Perform the correction operation again if the measurement conditions are changed such as test fixture and environment temperature It is recommended to perform the open and short correction at the same time During short correction period FA i FAIL will be displayed in the secondary parameter display area when short correction is failed Make sure that the measurement contacts are shorted reliably 18 TH2821B OPERATION MANUAL and perform the short correction again Th2821B measures the correction data at all frequency points and all measurement ranges The correction data is stored in the non volatile memory So you don t have to perform the correction again if the test conditions are not changed Open and short corrections are automatically selected by the instrument according to the impedance value under test If there is a component in the fixture or if there is error with the
9. lease contact our company or your nearest Sales and Service Office Accessories TH26028 DC Power Adapter TH26027 4 terminal Kelvin test clip leads 1604A 9V battery User Manual HA HL HH Options TH26029 SMD component test fixture TH2821B OPERATION MANUAL Notes on Use This meter is only for indoor use Turn off the TH2821B while switching the power supply between battery and DC adapter or replacing the battery Although internal circuit protection is provided DC voltage or current may damage TH2821B Before you measure a capacitor be sure the capacitor is fully discharged Take out the battery when the meter is not in use for more than 3 months A single standard 9V battery can be used for the power supply TH2821B will not work normally when battery voltage is less than 6V The 12V AC to DC adaptor is recommended to be used for TH2821B power supply Perform Open and Short corrections for accurate measurement especially when test fixture is changed The functions locked with password are not accessible by users TH2821B OPERATION MANUAL Warranty This instrument product is warranted against defects in material and workmanship for a period of two years from the date of shipment During the warranty period Our company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by our company Warra
10. nty limitation The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse or improper site preparation or maintenance Chapter 1 Overview Thank you for purchasing our product To get the maximum performance from the instrument please read this manual first and keep this manual at hand 1 1 Introduction TH2821B is a microprocessor controlled portable meter with low power consumption It can measure six basic parameters they are inductance L capacitance C resistance R impedance Z dissipation factor D and quality factor Q TH2821B can fulfill the measurement needs of various component manufacturers and maintenance technicians 1 2 Main Functions 1 Test Parameter L Q C D R Q and Z Q 2 Correction OPEN multi frequency correction of open circuit SHORT multi frequency correction of short circuit 3 Display Mode Direct direct measurement value 4 Range Hold When measuring a large number of components with the same nominal value this function can effectively improve the measuring rate 5 Equivalent Circuit Mode Both parallel and series equivalent circuit modes can TH2821B OPERATION MANUAL be obtained 6 Data Hold This function can be used to freeze the current display value 1 3 Specifications Parameter L Q C D R Q and Z Q Frequency 100 Hz 120 Hz and 1 kHz Accurac
11. tor Secondary 7 Parameter 14 UE Power Supply Display Table 2 1 LCD Description Others DH Data hold indictor CAL Correction function indictor MENU Menu operation indictor 12 TH2821B OPERATION MANUAL 2 2 Keyboard Illustration POWER PARA FREQ CLEAR C C DH AUTO RANGE DOC Figure 2 2 Keyboard Key Function POWERI Power On Off PARA Parameter Selection FREQ Frequency Selection CLEAR CLEAR Selection RANGE Range Selection AUTO Range Auto Selection DH Data Hold Series Parallel Indicator 6 0 e 0 0 0 EQU Table 2 2 Key Description 13 TH2821B OPERATION MANUAL Chapter 3 Operation 3 1 Power on 1 Press POWER key to turn on TH2821B 2 The operation system version will be displayed 3 At last the instrument enters the measurement state 1 345 6 7 n 10 9 Figure 4 1 Measurement Display Measurement display description 1 Battery Supply 3 Beeper ON 4 Series Circuit 5 Sorting Result P1 6 Parameter D 7 Secondary parameter 8 Unit 9 Range 0 Auto 10 Primary parameter 11 Frequency 1 kHz 12 Parameter C 14 TH2821B OPERATION MANUAL 3 2 How to operate 3 2 1 Key Functions 1 Parameter Setup Press PARA key to select the following m
12. y Basic Accuracy 0 396 5 digits display for both primary and secondary Display parameters 100 Hz 120 Hz 1 uH 9999 H 1kHz 0 1 uH 999 9 H 100 Hz 120Hz 1 pF 9999 uF Measurem ent Range 1kHz 0 1 pF 999 9 uF R Z 0 0001 2 999 9 Ma D Q 0 0001 9999 A 0 0001 9999 Test Level ju 0 3 Vrms 141099 Range Auto and Open 100Hz Circuit 120Hz 0 3 Vrms 14 1599 Ranging Mode Auto and Hold Equivalent Parallel and Series Circuit Display Direct TH2821B OPERATION MANUAL Continued Correction Open and Short Zeroing Rate Approx 3 meas sec Terminals 5 terminals Power Supply 1604 9V battery or DC12V 100 mA adapter Low Battery Indication Approx 6V Power Normal Approx 30 mA Consumption Auto power off Approx 500 nA Auto Power Off time Approx 30 minutes Weight Approx 400 g Dimensions 200mm L x 95mm W x 40mm D Table 1 1 Specifications d Note Primary parameter accuracy A C A 0 3 1 Cx CmaxtCmin Cx L Ac 0 396 1 Ly Lmaxt Lmin Lx Z Ac 0 396 1 ZyJ Z max Zmin Zx R A 0 3 1 Ry Rmax Rmin Rx 9 TH2821B OPERATION MANUAL Max and Min values are as follows Parameter Range Auto Cmax 80uF f Cmin 150pF f Lmax 159H f Zmax IMQ Zmin 1 59Q Here Zmax Rma Zmin Rmin Frequency unit kHz
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