OPERATION MANUAL TH2820
Contents
1. MODEL TH2820 LCR METER Version 2 Caution Keeping on turning on and off the instrument is absolutely forbidden as this will cause the disorder of the program which will lead to the loss of the calibrated data and the data saved by users Note 7 Advanced set in the setup menu should only be operated by the qualified calibration personnel therefore this function is password protected Even if you know the password you should also take high cautions when choosing to use the options Any wrong operations may lead to the incorrect test results This instrument should be calibrated in the calibration lab in our company Options and functions of the instrument may be advanced by our company in order to make the instrument more accurate Any queries regarding the instrument please feel free to contact us Content Content A ODN eaaa 2 Note 2 Chapter 1 Summafy ccicnia i dcanidnld ain iia aida aida 4 1 TO dUCU N dara oi ai eo do oia 4 A Oe 4 SPSCHICATIONS sonreir td giana 5 4 Environment 1a ett csc siuk ian a a a a aa enn iha Shits 6 Chapter 2 Panel OVerview 0 ecceceeessenceeeeseeeceeeeneneeeeenaneeneesanaeeesesaaeeseesaaaeceeneaeeeseesaaneneenaaes 7 1 EROME Panel asar cad tc td ote comune teu Ae 7 2 Rear Panel dia A AAA ado 8 Chapter 3 Operation IllustratiON ooo2. conditions as any of them will directly affect measuring precision or damage the instrument 1 Please do not operate the instrument in the places where is vibrative dusty under direct sunlight or where there is corrosive air 2 Although the equipment has been specially designed for reducing the noise caused by AC power a place with low noise is still recommended If this cannot be arranged please make sure to use power filter for the instrument Please store the instrument in the place where temperature is between 25 C and 50 C If the instrument will not be put in use for a while please have it properly packed for storing Operation environment for securing measuring precision requirement Temperature 0 C 40 C Humidity lt 85 R H Pre heat the instrument about 10 minutes before starting measuring TH2820 LCR METER Chapter 2 Panel Overview EN Front Panel Sl asomar TH2820 LCR METER Laka Correa Uisp Lorange POWER A SORT ING BUZZER Proy P2 Vn N LIN 8 7 Figure 2 1 Front panel Following is the description of items 1 9 in Figure 2 1 Parameter Description Displaying current measured parameters L Q C D R Q Z Q Z D or AUTO Frequency Displaying current frequency 100 Hz 120 Hz or1 kHz Display Mode Displaying current display mode of the primary parameter DIR A or A Range Displaying range state Auto Hold or current range Bins Indica
3. should meet the following requirements 1 To minimize stray capacitance of the test leads especially when component of high impedance is measured Such as small capacitor How to eliminate the stray capacitance please refer to the next paragraph 2 To minimize contact resistance between contacting terminals and the device under test Make sure that four terminal measurement circuit configuration is constructed 3 OPEN and SHORT correction can be performed Zero correction is a very effective way to reduce the influence of stray impedance EJ Stray Capacitance HD HS LS LD Shield Test terminal Metal conductor gt Figure 4 1 Capacitance to Ground 22 Chapter 4 Maintenance and Measurement Basic When component of high impedance for example small capacitor is measured the influence of stray capacitance cannot be ignored As shown in Figure 4 1 Cd is in parallel with Cx When there is conductor board under the tested component capacitance Ch is connected in series with Cl then Ch and Cl are connected to with Cx in parallel Cd Ch and Ci will cause errors to measurement values To place a grounded conductor between the high terminal and the lower terminal can reduce capacitor Cd In addition if the conductor board is grounded Ch and Cl will be eliminated HD HS LS Shield Shield Test terminal a Connected 40 ground Metal conductor Figure 4 2 Reducing Capacitance to Ground When low impedance c
4. C Cuaxare shown in Table 4 1 U Cmax 1000V lt 2uF 400V 16 uF 125V 160uF 40V 1600uF 12 5V lt 16000uF Table 4 1 Typical values of U and Cmax 2 Measurement Contacts TH2820 s test terminals consists of four coaxial cables the outer shield conductor of each cable is connected with Ground Sometimes we also call it five test terminals Five terminals are described as follows HD High current drive LD Low current drive HS High potential sample LS Low potential sample L Grounded shield The ground shields are used reduce influence of stray capacitance and electromagnetic 21 TH2820 LCR METER disturbance HD HS and LD LS should be connected at the lead of the component under test in order to reduce the influence of cable resistance and contact resistance especially in D measurement When measuring low impedance the drive terminals and sense terminals should be connected to leads of component separately so as to avoid the influence of lead resistance S Note In other words HD HS and LD LS cannot be connected before connecting to the component otherwise measurement error will be caused Refer to Figure 4 1 If contact resistance and leads resistance Rieag are far less than the impedance tested for example Rieag lt 2X 1000 and the accuracy required is 0 1 then HD HS and LD LS can be connected together before connecting to the component under test two terminal measurement Test cable or fixture
5. als are shorted cursor flashes under 1 2 SHORT c When a component is connected to the terminals the following information is displayed as shown in figure 3 5 Open or short Connector Figure 3 5 Open or short Remove the component and select the open correction Or insert the shorting plate and select the short correction d Press Start key to start zero correction e The following information is displayed during zero correction OPEN Range 0 Clearing Pass 1kHz Figure 3 6 Zero correction in process Notes T The correction function must be used in order to measure the device under test accurately OPEN correction capability cancels errors due to the stray admittance G B in parallel with the device under test SHORT correction capability corrects for the residual impedance R X in serial with the device under test Perform correction again when measurement conditions are changed such as test fixture or environment temperature OPEN and SHORT correction should be performed at the same time The SHORT correction may be failed if the measurement contacts are not shorted reliably Make sure the test terminals are shorted and then perform SHORT correction again Sweep correction All ranges at each frequency are corrected The correction data is stored in non volatile memory So you don t have to perform correction again if only frequency is changed Chapter 3 Operat
6. ameters Take the following capacitor as an example Example The capacitance in series model is Cs 0 1uF calculate the capacitance in parallel model for a D1 0 0100 b D2 0 1000 and c D3 1 0000 Solution According to the formulas in table 3 6 the capacitances in parallel model are Cp1 0 09999uF Cp2 0 09901uF Cp3 0 05nyF You can find that when D lt 0 01 the difference between Cs and Cp is very small but while D gt 0 01 the difference will be very obvious For example when D 0 1 the difference between Cs and Cp in percentage is approx 1 while D 1 the difference in percentage will be about 50 The following description gives some practical guidelines for selecting the capacitance measurement circuit mode We can select the circuit mode according to the variation of D atp two different frequencies If the dissipation factor of a capacitor increases with the increase of the test frequency series circuit mode should be selected If the dissipation factor decreases with the increase of the test frequency parallel circuit should be used For inductor the situation is just in the opposite side In fact D is impossible in direct ratio with the test frequency From Figure 3 8 we can find that Rp and Rs exist at the same time If Rs is more significant than Rp series mode is selected If Rp is more significant than Rs parallel mode is more suitable Cx Rs Lo Rp Cs Figure3 8 Equivalent circuit of a
7. asured value and the reference value A delta percent between the measured value and the reference value 3 Range Hold When measuring a large number of components with the same nominal value this function can effectively improve the measuring speed 4 Comparator Function TH2820 s built in comparator can sort components into a maximum of four bins NG P1 P2 and P3 5 Equivalent Measurement Circuit There are two equivalent circuit models parallel and series EJ Specifications TH2820 LCR METER Parameters L Q C D R Q Z Q and Z D Test Frequency 100Hz 120Hz and 1kHz Display Digits 5 digits for both primary parameters and secondary parameters L 100 Hz 120 Hz 1 uH 9 9999 kH 1 kHz 0 1 uH 999 99 H measurement c 100 Hz 120 Hz 1 pF 9 9999 mF 1 kHz 0 1 pF 999 99 uF Range R Z 1 mQ 999 99 MQ D Q 0 0001 99999 A 0 0001 99999 Accuracy Test C 0 3 1 Cy Cmaxt Cmin Cx 1 D Condition within L 0 3 1 Ly Lmax Lmin Lx 1 1 Q basic Z 0 3 1 Zd Zmaxt Zmin Zx measurement R 0 3 1 Ry Rmax Rmin Rx 14 Q range 23 C45 C gt D 0 001 14 2Z Zmaxt Zmin Z 1 D D 2 0 0002 lt 75 R H Q 0 002 1 Z Zmaxt Zmin Zx Q 1 Q Test signal level 0 3Vims 1 10 Ranging Mode Auto Hold Equivalent model Series Parallel Direct actual measured value Dis
8. e 1 Warranty Certificate 1 User s Manual 1 If any damages or incompleteness of contents are found when receiving the product please immediately contact our company or our dealer from whom you purchased the product 2 Warranty Warranty Period This product is warranted against defects in material and workmanship for a period of two years from the date of shipment Warranty certificate should be presented for warranty service or repair Our Company provides lifetime service for our products 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 operation outside of the environmental specifications for the product or improper site preparation or maintenance In this case buyer shall pay charges for shipping and repair 24
9. ion Illustration 2 Equivalent a Press gt button to enter equivalent option 1 Clear 0 2 Equivalent Figure 3 7 Equivalent Circuits b Use and v buttons to select SER or PAL c Press d or to return Notes 1 The actual capacitor resistor and inductor are not the ideal capacitor resistor and inductor Normally a component has the characteristics of the resistor and the reactor at the same time The actual component is composed of an ideal resistor and reactor ideal inductor or capacitor in series or parallel equivalent circuits 2 The values in the two different equivalent circuits can be converted to each other using the following formulas in Figure3 6 The values are different due to the quality factor Q or the dissipation factor D Circuit Mode Dissipation Factor Cp he 1 1 1 D JC 2QafC Rp 0 K a D a C 1 1 D C gt D 27fR Cs il s E Q R R 1 D D L 2 Rp R Q R RpD 1 D L R 1 L l D L VV VV SS Lp ne 2mfL Q R R 1 D D Figure 3 6 Conversions between Series and Parallel Circuits L Inductor C Capacitor f Frequency R Resistor D Dissipation factor Q Quality factor Suffix s Series Suffix p Parallel 15 a TH2820 LCR METER Form the above table we can see that the parameters have relations with D or Q and the value of D will directly affect the values of the par
10. layed as shown in Figure 3 3 ES F D 1 0000 C D 100Hz Dir HOLD Figure 3 3 Overload Note If the measurement value exceeds the display range of the instrument overload symbols will also be displayed 5 How to calculate the measurement range Example Suppose capacitance C 210pF dissipation D 0 0010 and test frequency f 1kHz Solution We can calculate Z 757 9 From Table 3 4 you can find the correct measurement range is range 2 Indirect Functions Setup Indirect functions are Clear 0 Sorting Auto LCZ Buzzer Change cursor Advanced set and State save amp exit Press Setup key to enter the setup menu in measurement state Pressing Setup key again the instrument returns back to the measurement state Key functions are defined as follows KEY 1st Function 2nd Function 4 Back to main menu Move left gt Enter sub menu Move right a Move up Add 1 v Move down Minus 1 START Enter Table 3 5 Key Functions 12 Chapter 3 Operation Illustration SEREEN 1 Clear 0 l 2 Equivalent E gt E ocn 4 Auto LCZ gt setaseesosesseconsssceooses 6 Change cursor aa 7 Advanced set E id 8 State save amp exit Figure 3 4 OSD Menu Tree 13 TH2820 LCR METER 1 Clear 0 a Press button to enter clear 0 function b TH2820 can select OPEN or SHORT automatically When terminals are opened cursor flashes under 1 1 OPEN When termin
11. lect P1 P2 P3 NG and OFF states c Press 4 or key to return selected state is saved automatically 6 Change cursor a Press key to set cursor shape de BUZ Ber 6 Change cursor Figure3 12 Set cursor shape b Press or keys to select _ or W Y c Press 4 or key to return 7 Advanced set TH2820 LCR METER This function needs password For instrument calibration only 8 State save amp exit 1 The following states are stored in non volatile memory as the initial states when TH2820 is turned on next time Measurement parameter Measurement frequency 8 Display mode 1 Equivalent circuit model Auto LCZ state Position of cursor 2 Instrument returns to measuring state after saving the states H Note Th2820 will exit the setup menu by pressing can not be saved Setup or Start 20 key but the changed states Chapter 4 Maintenance and Measurement Basic Chapter 4 Maintenance and Measurement Basic EN Input Protection Internal circuit protection is designed to protect the instrument from damage by a charged capacitor When a charged capacitor is connected to the UNKNOWN terminals The maximum capacitance is 2 5 Cuax y Where U is the capacitor voltage V Cmax is the maximum capacitance in Farads under the capacitor voltage U Typical values of U and
12. ler first two digits __ Table 3 3 The conversion of display digits B Display mode Direct reading Dir Absolute delta A Percent delta A 1 A delta absolute deviation measurement ASE AZ ag Xx Measured value Xstg reference value 2 A Delta percent deviation measurement A Xs Xua 100 X std C Measurement range 1 The instrument has 5 measurement ranges The measurement range is selected according to the impedance even if measurement parameter is capacitance or inductance CE EE Table 3 4 Range NO Range Resistor and Up and Down Limits of Impedance 2 When measurement range is set to AUTO the instrument first estimates if current range is the correct range if it s the correct range then the instrument calculates and displays the measurement value otherwise instrument has to change to the correct range and start measurement again Therefore in range AUTO mode one more measurement will be taken if the measurement range has to be changed 11 TH2820 LCR METER So more time is taken in range AUTO mode 3 If a large number of devices under test belong to the same range the correct range can be locked to raise the measurement speed For the instrument do not have to take any time to find the correct the range 4 When measurement range is set to HOLD if the impedance under test exceeds the effective measuring range of the locked measurement range overload symbols will be disp
13. n actual capacitor Where Cx ideal capacitor Rx resistance of the leads Lo inductance of the leads Rp insulation resistance across the capacitor Co stray capacitor across the capacitor For a given frequency F Cs and Cp can be calculated 16 Chapter 3 Operation Illustration b Select the equivalent circuit according to the actual application in circuits If a capacitor is used as a coupling capacitor series circuit mode is the best choice if a capacitor is used in a LC oscillator then parallel circuit mode is more suitable c When there is no proper information available please make decision according to following rules For low impedance component such as large capacitor or small inductor the series equivalent circuit mode should be used For high impedance component such as small capacitor or large inductor the parallel equivalent circuit mode is the appropriate choice In general gt when Z lt 10Q gt series equivalent measurement circuit should be used When Z gt 10kQ gt parallel equivalent measurement circuit should be used When 10Q lt Z lt 10kQ gt please choose proper equivalent measurement circuit according to the actual situation TH2820 LCR METER 3 Sorting a Press button to enter sorting function son menu b Use button to select a digit to be changed Press or keys to change the digit value or sign c Press lt button to select digit position or re
14. omponent for example small inductor or large capacitor is measured a larger current will flow through the test wires HD and LD Electromagnetic coupling between the test wires will become the main source of error Normally the contact resistance will affect resistance part of the component while the electromagnetic coupling will affect reactance part of the component under test The best way to eliminate the electromagnetic coupling is to adopt the four terminal pair connection But this instrument adopts the four terminal connection instead of the four terminal pair connection A double twisted test cable is also helpful to eliminate electromagnetic coupling because the currents flew through HD and LD have the same magnitude but opposite directions the magnetic fields induced by HD and LD cancel each other so no external magnetic fields are generated around the cable There are two methods to make a double twisted cable The first method is that HD is twisted with LD and HS is twisted with LS The other method is to twist the four wires directly The first method is recommended 23 TH2820 LCR METER Chapter 5 Contents and Warranty EN Contents After unpacking the shipping container please do following checking 1 Any signs of damage or scratching on the outlook of the products 2 Table of contents DESCRIPTION QTY REMARK TH2820 LCR Meter 1 Power cable 1 TH26004 test cable 1 Fuse 2 1A Calibration report 1 QA Certificat
15. ononcccnnnnococonnnancconononcnnnnnanonnonnnno nc nnnnnnn nn nc nnnr nn cnn nn rca rn 9 1 TURNING OMA AAA Ao Maas 9 2 OPIO A E Il At 10 Chapter 4 Maintenance and Measurement BaSiC ooooccconnocicicnnocccnconancnnnnonnnncncnnannnncnnnnnnncncnnnn 21 PEO UE POLS GEOR racial 21 Measurement Contacts cr te Montcanoaneaeeden 21 e ade e eat e 22 Chapter 5 Contents and Warranty ococcnnoocccnnonoccnnnnnnnnnnnnanoncnnnononcnncnnnnn ocn n cana n nn nc nnnn nn cn nnnnnccnnnnn 24 1 EoD LE E AAEE A enue eusnnt el Laiiae baa eenaw ela tena Mepba EEO 24 2 Walla cita a in A ie Wank 24 Chapter 2 Panel Overview Chapter 1 Summary Thanks for purchasing our products Please check the contents according to the last chapter Contents and Warranty of the manual before put the instrument in use EN Introduction Model TH2820 LCR meter is a micro desktop instrument by using microprocessor technology It can measure 6 basic parameters they are inductance L capacitance C resistance R impedance Z dissipation factor D and quality factor Q which can fulfill the measurement needs of various components manufacturers and maintenance technicians 2 Main features 1 Zero Correction OPEN sweep correction of open circuit SHORT sweep correction of short circuit 2 Display Format Direct actual measured value A absolute delta between the me
16. play A absolute delta A delta percent Correction Open and Short correction Test Speed approx 3 times second Test Terminals 5 terminals 9999 9999 Range of Sorting L 0 0001 uH 99999 kH wee Nominal C 0 0001 pF 99999 mF Limits value R 0 0001 mQ 99999 MQ Z 0 0001 MO 99999 MQ Sorting Bins NG P1 P2 and P3 Alarm States NG P1 P2 P3 and OFF Weight Around 1 5 kg Consumption Max 10 W Power 220VAC 1 10 50Hz 145 Chapter 2 Panel Overview Note 1 Accuracy of D and Q are delta absolute deviations the rest are delta percent deviations 2 Suffix with x is the actual measured value of this parameter suffix with max is the maximum value suffix with min is the minimum value Parameter 80uF f Range Hold 1000pF f Range1 0 1uF f Range2 1uF f Range3 10uF f 80uF f 150pF f 150pF f 1900pF f 10nF f 100nF f 1pF f 159H f 159H f 25 3H f 2 53H f 253mH f 25 3mH f 0 32mH f 2 53H f 0 25H f 25 3mH f 2 53mH f 0 32mH f 1MQ 1MQ 159kQ 15 9 kQ 1 59KQ 1590 Zmax Rmax 1 590 15 9kQ Zmin Rmin 1 59kO 1590 15 90 1 590 3 In order to maintain good test accuracy proper open and short circuit corrections should be taken under current measurement condition and measurement fixture EM Environment 1 Please do not operate the instrument under the following environment
17. tion NG No good P1 Pass1 P2 Pass2 P3 Pass3 P1 P2 P3 Priority is lower in turn Buzzer Test Terminals HD HS LS and LD Cursor keys Function table moving and rolling Key Setup key Entering function table setting Start key The executing confirmation of command POWER Power switch Table 2 1 Front Panel Descriptions Chapter 2 Panel Overview 2 Rear Panel Figure 2 2 Rear panel Description Plate Production date model and serial number Fuse Holder 1A 250 Vac slow blow fuse Power Receptacle 220 Vac 50 Hz Table 2 2 Rear Panel Descriptions Chapter 3 Operation Illustration Chapter 3 Operation Illustration This chapter will introduce how to operate this instrument in details please read it carefully before operating in order to avoid any damages to the instrument or dangers to the safety EM Turning On a Display company name and version the indicator lamps of P1 P2 P3 NG flash in turn TH2820 LCD LCR METER Ver1 0 Figure 3 1 Turning on information b Starting power on self tests 1 EEPROM Memory checking 2 ADC AD converter checking c Entering measuring state after self tests Cs 0 0030pF D 1 0000 C D 100Hz Dir AUTO Figure 3 2 Measuring state The factory settings are listed as follows and can be reseted according to the operation description in next paragraph 1 Parameter C D 2 Frequenc
18. turn value is saved automatically when return d Press Start key you can directly return from value setup state or enter the unit setup state When you setup nominal value 1 L C R and Z have the same sorting bin limits but each nominal should be set respectively 2 The nominal value is determined by what kind of parameters is currently measured and displayed Nominal Cstd is for C D Lstd for L Q Rstd for R Q and Zstd for Z Q Z D 3 Sorting function is enabled under any display mode Dir A or A In order to sort correctly make sure that high limit must be greater than low limit for a pair of bin limits Flow Chart of Sorting 5 Flow Chart of Sorting NG FAIL Figure3 9 Flow chart of sorting Chapter 3 Operation Illustration 4 LCZ auto a Press button to enter Auto LCZ option 3 Clearing 4 Auto LCZ Figure3 10 Auto LCZ option buttons to select ON OFF c Press 4 or to return b Press a 4 Notes 1 When Z gt 25MQ Z Q is selected automatically 2 When Z lt 80m0 Z Q is selected 3 When 80mO lt Z lt 25MQ If Q lt 0 125 Z Q is selected If Q gt 0 125 L Q is selected If Q lt 0 125 C D is selected 5 Buzzer a Press button to set buzzer state A CZ cao 5 Buzzer Figure 3 11 Set buzzer state 4 b Press a keys to se
19. y 100 Hz 3 Display Dir direct reading 4 Range AUTO automation 5 Equivalent SER serial 6 Alarm Bin P1 Pass 1 7 LCZ automation OFF 8 Cursor _ TH2820 LCR METER EJ Operation Direct function setup Parameter frequency display and range a b Press 4 gt keys to move the cursor and select one of the four direct functions Press a w keys to select 5 0 0030pF D 1 0000 C D 100Hz Dir AUTO Para Freq Disp Rang A Parameter Unit descriptions LQ 100Hz Dir AUTO cD 120Hz A HOLD 2 Za m 3 1 OSD Direct Function m uH mH H kH pF nF uF mF MQ Q kQ MQ Table 3 2 units 1 Zis 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 maybe negative due to over zero correction Please carry out correct zero correction The maximum number of display digits is 5 but 5 digits is not always available and 4 digits is displayed sometimes The conversion is described in the following table 2 Chapter 3 Operation Illustration First two digits of Current apa P display digit 4 Bigger first two digits first two digits 5 Smal
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