User`s Manual PDF - Globalmediapro Ltd.
Contents
1. Perform following steps to measure a device in Equ Scan and Manual mode Press Mode key to select the Equ Scan mode _ 2 Press Auto key to select the Manual scan mode referring to paragraph 4 3 1 3 Press Step key to set the Scan Numbers referring to paragraph 4 3 2 4 Press Setl key to set the current value for I and le referring to paragraph 4 3 3 5 Press Retu key to set the loop function referring to paragraph 4 3 5 6 Set the footswitch mode to Trig mode 7 The setups are listed below and the following display page will be displayed NH Manual operation mode NH Scan Numbers 6 Loop function disabled E FootMode Trig Exp SoantH b s la 1 588 He Shor 8 Connect the device to the UNKNOWN terminals 9 Press START or trigger the footswitch to start the bias current output 10 Read the measurement result from the LCR meter 11 Press START or trigger the footswitch to the next current point 12 Repeat step 10 and 11 until all current points are finished 13 Press RESET button to end the measurement at any time 14 Disconnect the device under test 15 Repeat step 8 to step 14 to test other devices 33 4 6 Messages displayed during operation Two kinds of error messages may be displayed during operation 4 6 1 OverLoad If TH1775 and the slave current sources fail to provide the preset bias current value within 1 second TH1775 will no longer attempt to output the bias current and O2. Mode key Current output mode selection There are three types of current output modes Single point current output mode Single Out Multi point current output mode MultScan and Equal interval multi point current output mode Equ Scan Press the Mode key to select one of the three current output modes in turn Single Out MultScan Equ Scan Setl key Use the Setl key to set the output current value displayed on the LCD screen Auto key Press Auto key to set the Automatic scan mode AutoScan 1 or Manual scan mode AutoScan 0 when MultScan or Equ Scan output mode is used Retu key Press Retu key to enable Return 1 or disable Return 0 the loop current measurement when MultScan or Equ Scan output mode is used Step key Press Step key to set the Scan Numbers from 2 to 15 when MultScan or PartScan output mode is used 14 NOTE NOTE Dela key Press Dela key to set up the Scan Delay time from O to 99 sec When Auto scan is ON the next current point will be outputted automatically after the Scan Delay time is expired When Auto scan is OFF the next current will not be outputted until the START button is pressed or the footswitch is stepped after the Scan Delay time is expired The setup parameters for Setl Auto Retu Step and Dela can be stored automatically and will not be lost when power has been off or after a reset Option key Press d key to save the
3. 4 kf Frequency factor Current Factor ki Current Range ki 0 0mA to 2A 0 2A to 20A Unknown Inductance Factor kl Unknown Inductance kl 0 uH to 20uH 0 5 20uH to 2mH 0 2mH to 200mH Frequency Factor kf Frequency Range kf 1kHz to 10kHz 0 10kHz to 100kHz 0 5 100kHz to 300kHz 300kHz to 1MHz 2 1 5 2 Additional Error Specification Test Conditions m Use the L or LCR meters manufactured by Tonghui Select slow or medium measurement speed for LCR meter LCR s test signal voltage level more than 0 25Vrms Use the test cable and accessories provided with the instrument and Link the instruments according to the instruction in this manual m Perform SHORT correction after linking with the Bias current source 1 6 L LCR Meters Available TH1775 can be used with following L meters or LCR meters Model Description Control Interface TH2773A TH2775 TH2776 L Meter None TH2810 TH2811 TH2812 Series LCR Meter None TH2816A TH2816B TH2817 TH2817A Precision LCR Meter Wide Frequency LCR Meter Yes TH2816A only Yes TH2817A only TH2818 TH2819 Precision Component Analyzer Yes NOTE1 In case of product changes and updates please check our newest Catalog NOTE2 LCR meters based on the four terminal pair theory can not be used with TH1775 for example the TH2828 LCR meter s
4. LINE o o 0 SLAVE LINK 0 0 O A oa AC 110V 60Hz an 500VA Max RS 2320 of Jo FOOT SWITCH 4 5 8 6 vo V 2 3 GPIB interface optional This optional interface provides a way to communicate with a computer and other instruments which are also equipped with GPIB interfaces RS232C Interface optional The RS232C interface is also an optional interface which can be used to communicate with a computer and with some of our L LCR meters which can be programmed to control a bias current source Footswitch A foot switch can be used to trigger the TH1775 Several control modes of the footswitch can be selected from the Option menu FootMode Fuse Use a 10A slow blow fuse for this instrument Press the fuse holder and turn anti clockwise at the same time to loose the fuse holder Press the fuse holder and turn clockwise at the same time until the fuse holder is locked Warning Disconnect the power cable before replacing the fuse Line Receptacle Use the standard three wire power cable provided with the instrument Cooling Fan TH1775 uses two cooling fans Make sure that sufficient space must be kept around the TH1775 to avoid obstructing the air flow of the cooling fans Slave Link Up to 4 slave bias current sources can be paralleled to provide a maximum 100 A bias current Name Plate Provide the information of Serial number and name of manufacture 17 Chapter 4 Basic Operation The foreg
5. devices Warning Device under test terminals and adjacent area may become hot due to high power dissipation of the DUT Be careful when exchanging devices 24 Warning Turn off the BIAS current before disconnecting the device under test from the test fixture 4 3 Setup for MultScan and Equ Scan Working parameters and modes such as AutoScan Return Scan Numbers and Scan Delay have to be set before using the MultScan or Equ Scan mode 4 3 1 Auto There are two scan operation modes for MultScan and Equ Scan AutoScan 0 Manual Perform following steps to set AutoScan mode 1 Press Mode key to select the MultScan or Equ Scan mode 2 Press Auto key to to enter the lt SetAutoScan gt display page as shown in the following figure 3 Press to select the Auto mode or press to select the Manual mode 4 Press dl key to confirm the AutoScan mode and return back to the current output page 5 Press Ej key to cancel the AutoScan mode and return back to the current output page 6 If Auto mode is selected A will be displayed on the top right corner of the LCD as shown in the following figure 25 4 3 2 Step Scan Numbers is the maximum current points you want to output Perform following steps to set Scan Numbers 1 Press Mode key to select the MultScan or Equ Scan mode 2 Press Step key to to enter the lt Input Date gt display page as shown in the following figure 3 Use
6. select a current point from l4 to In 4 Press Setl key to enter the lt Input Data gt display page as shown in the following figure Theat Data m n H 5 Use the entry keys o a LJ B LJ 6J iG 7 e 9 LJ LJ mA to set up the current value from 100A to 100A 6 Press d key to confirm the input value and return back to the current output page If a current value out of the maximum value is inputted Data Out error message will be displayed TH1775 will return back to the lt Input Data gt page in step 5 Try to enter the right current value again Trrut Data lata Qut 7 Press key to cancel the input value and return back to the current output page 8 Use or key to select another current point from I to In 9 Repeat step 3 to step 8 to input other current points Perform the following steps to set the I and l currents for EQU Scan mode Press Mode key to select the Equ Scan mode 2 Set the Scan Number for Equ Scan mode first 3 Use or key to select the start current ls 4 Press Setl key to enter the lt Input Data gt display page as shown in the following figure Pireu Data ij free iii MFHT DAT DE a E iT 5 Use the entry keys o LJ 2 3 2 i e 7 e 3 LJ LJ mA to set up the current value from 100A to 100A 6 Press d key to confirm the I value and return back to the current output page If a
7. supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance Tonghui Electronic Co Ltd No 3 Tianshan Road New District Changzhou Jiangsu China Tel 86 519 85132222 Fax 86 519 85109972 www tonghui com cn Chapter 1 Genernal Information 1 1 Introduction TH1775 is a MPU controlled DC Bias Current Source covering a DC bias current range from 20A to 20A TH1775 can be used with most of Tonghui s L meters and LCR meters TH1775 provides a convenient and practical DC Bias Current Source for AC DC overlap inductor measurement and magnetic material analysis TH1775 provides three types of output modes m Single Out MultScan m Equ Scan MultiScan and Equ Scan output modes can be performed either manually or automatically for different occasions Loop function can be enabled for both MutiScan and Equ Scan modes Newly developed theory of AC DC overlap measurement is adopted to ensure high accuracy and high frequency measurement demands User s data and all test conditions are stored in non volatile memory and do not change when power has been off or after a reset Its very easy and convenient for daily operation 1 2 Main Features Forward and reverse current can be switched Output current can be finely adjusted in Single Out mode Loop Scan measurement can be performed automatically or manu
8. to Trig mode 8 The setups are listed below and the following display page will be displayed NH Auto operation mode NH Scan Numbers 6 NH Scan Delay 5 sec Loop function enabled E FootMode Trig MultocaniH Gos E H Li 1 058 He a a 9 Connect the device to the UNKNOWN terminals 10 Press START or trigger the footswitch to start the bias current output The current points will be outputted automatically in the following order START h Delay l2 gt Delay gt gt ls Delay Is gt Delay gt gt gt Delay gt l gt Delay gt Over 11 START button or footswitch can both be used to skip the delay time and switch to the next point directly Read the measurement results from the LCR meter Press RESET button to end the measurement at any time Disconnect the device under test Repeat step 9 to step 14 to test other devices 13 14 15 Perform following steps to measure a device in MultScan and Manual mode Press Mode key to select the MultScan mode 2 Press Auto key to select the Manual scan mode referring to paragraph 4 3 1 3 Press Step key to set the Scan Numbers referring to paragraph 4 3 2 4 Press Setl key to set the current value for each point referring to paragraph 4 3 3 5 Press Retu key to set the loop function referring to paragraph 4 3 5 30 gt A _ A a gt we a al Set the footswitch mode to Trig mode Th
9. 6 1 5 2 Additional Error Specification Test Conditions 02 0 ccc cceecsceseeceeseneeseeceeececseeseeeeseeseeseeeeeeens 7 LO T ECR Meter Avalan A aa cities 7 A NS 8 Chapter 2 Installation and Preparation cccsescesescssseseeseeseseeseeseeeseeseesesecsecseeseeesecseeseecesecsesseeeeeeesesaeeseeeeees 9 2 1 Operation Environment anhon decided desata tetas drid dotada digais ett Sisi dei dicte dire 9 2 1 1 Temperature and HUMIGIty ee eececesceseeseceseeseesecseeceeseesecseeeaeeaecseceeeeseeaeceeeeaeeaeeaeeeeeaeeas 9 2 1 2 Ventilation Requirments caninin ii a E E EAE ER cono rar rnnonss 9 2 9 EineVoltageReg latio M enoia e E E E O ees 9 DAMAS gE rs A dc acts 9 2 2sPOWEr LIne COMMON Cua teveds Bestes Rectuedeaten the luaceueds fo a a a esol 10 2 21 FUSE Select cocida 10 2 2 2 Ground the INStrUMeENt ESE 10 2 3 Footswitch Connect Onis ssiococsswecceraseecess steerer A eater A E A A N A Te 10 2 Ay F r On the PO A A nb bn OR seh eke Se Sah Saks ES ah och dns Cee vad bs 11 PAOA JIAO EE A A E 11 20 Check the Instruments Before Us ies Secevessenks ves aint sSben is 12 Chapter 3 Panel Descriptio Niks anienel a e sae a Aa 14 3 1 Front Panel Description n a ici 14 3 2 Rear Panel Description sorene clasts oslvavegecdvevts A N EA A E E A E A AN 17 Chapter 4 Basic Operathorncs cisccsc diel scsbeeud a A A A A suesowes buens 18 CA NS 18 AMA SAR Ot O do ages had en a dano onde eats na aah lads sal ds 18 ANILEOOUMOE cui AAA AAA AAA AA 19
10. ASS DUI SIA 20 4 14 BUS MOOG sc seercessacevoctacvetsiasevsvesusevetens saierens dar aerea italia aria diia 20 AO SPB AOS Silla lid rallada ola 21 AAO FileNUM ci ia A a EAR iaa 22 A A E E O aauthoane 22 4 2 single Qut Modena a dl TI AS 23 4 3 Setup for MultScan and Equ Scansione ocior ni o iai n aeo aa ea ae aa s 23 4 STAU O iia 25 A a a a a a E ER Tee 26 ESSI Setli hena a a e e eres aE da dit aa det da 26 43A Deliei n E A A a a 28 AO ROW rn i E tale aie rel ate AA teal de N T 28 LARUS CIE ModS lea cree pero ere 30 AD EGU SCAN ModE rentado delito E aE 32 4 6 Messages displayed during Operation eee cece eects ceeceecesecseceeeeseesecsecsseesecsesseseatseseseseeaeceaeeseeneeeaee 34 AOE or o A daria 34 AiO 20 o A A es 34 Warranty This Tonghui instrument product is warranted against defects in material and workmanship for a period of one year from the date of shipment During the warranty period we will at out 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 Tonghui Purchaser shall prepay shipping charges to Tonghui and Tonghui shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Tonghui from another country The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer
11. TH1775 Bias Current Source User s Mannual Chapter 1 General Information cc cccecessescesceseeseeeseeseeseseeseeseeseseeseesenseseesecseaceseesecsenseesesecseesenseeeseeaeeaeeeeaes 4 AR Wisc aE E E E E A ATE AA AT ORA E 4 Mam ES a a a a Pe ec eee 4 L3 Specifica A NR 4 TESST EG UPON a aR innse aae eae aea a a A 4 ESA DIETS E EE E A A A ateswetecnentevaeues 4 13S Freqduency BandWidthisiin innen a di Ss 5 1 3 4 Maximum Driver Capacity meea a aa e e a a 5 1 3 5S an number Sii A daca AAA E tect aE a ad ATE 5 130 Sa Del ii ad 5 a 5 1 38 CONNECHION v duici colorados E AE AEE vada des cua doi deidad Scott i s 5 RENSA nane Olan e ARE etc sccs Nes sca Cesnneae ach as fobs rhe laneate sonlene E EN 5 1 3 10 Working Tim sida nideierdintlde inde Avie alae inlaw addr hale Annas 5 to AUP OWS Tice och facta this a TEA ATE A ll tease 5 1 3 12 Operation environment siseses nn a a a a a a meantert 5 SAS DIMENSIONS AAEE A EE E EEA A E EE EE AE E 5 1 3 14Weighte ia datada SET AEAEE EOE E AEE N 6 LA BASIC ACUC A A E 6 1 4 1 Accuracy Test Requirement ccccsccsccsssstsececescesessceescescsssssecsecesssnseseeessensenecseceasenssneeeaseneans 6 124 2 CUPFEMEACCUFACY a a uk uch ees sok Seg aad bas daks e dash dah stag desleliea dels sub a a taok tens 6 1 3 Additional Error for ECR i Meter aii 6 1 5 1 Additional error CalCulation 0 2 0 ee eccecesceseeseeesceseeseeseesececeesecsecseceseesecseceeeaeeaececeeeeaeeaeeneeeaeeas
12. ally A footswitch can also be used to control the bias current output Up to 5 sets of control settings can be stored to five files 1 3 Specifications 1 3 1 Current From 20A to 20A Three different current ranges are available 200mA 2A and 20A TH1775 can select the correct range automatically according to the current value user set Up to 4 slave TH1775s can be paralleled to output a maximum bias current 100A 1 3 2 Display 2x20 large characters LCD display 1 3 3 Frequency Bandwidth From 1 kHz to 1 MHz 1 3 4 Maximum Driver Capacity Output voltage 8Vmax E Maximum Tolerance of unknown DCR Rmax 7 5 1 Q Iis the setting current unit A NH Maximum Tolerance of unknown inductance Lmax 100 I mH Iis the setting current unit A NH Maximum Open circuit time Tmax 1 second Maximum current settling time 1 3 5 Scan numbers From 2 to 15 points 1 3 6 Scan Delay From 0 to 99s 1 3 7 Interface TH1775 provides Slave Link interface RS232C interface optional and GPIB interface optional 1 3 8 Connection TH1775 can be directly used with and controlled by some of Tonghui s L meters or LCR meters 1 3 9 Warm up time Warm up the instrument for about 30 minutes 1 3 10 Working Time TH1775 can work continuously 1 3 11 Power Power supply 95 to 125V AC Line frequency 48 to 62Hz Power consumption s500VA 1 3 12 Operation environment Temperature 0 to 40 C Humidity lt 80 RH 1 3 13 Dime
13. as current output and the second footswitch trigger action same as RESET button pressing will interrupt the bias current output immediately For MultScan or Equ Scan mode and AutoScan is set to Auto mode the footswitch can only be used to start the current output If you want to interrupt the current output you have to press the RESET button on the front panel For MultScan or Equ Scan mode and AutoScan is set to Manual mode the first footswitch trigger action will start the bias current output and each following footswitch trigger action will change the output current to the next scan current point until all setup current points have been finished FootMode Hold Hold mode is available only when Single Out mode is used Step on the footswitch and hold on to enable bias current output and the bias current will be interrupted as soon as you loose the footswitch Footswitch operation for MultScan or Equ Scan is the same as when Footmode is set to Trig mode 19 4 Press d key to confirm and save the change of FootMode and return back to the current output page 5 Press key to cancel the change of FootMode and return back to the current output page 4 1 3 OutTuner This function is only available when Single Out mode is used which can be used to finely adjust the current output value using the cursor keys It s very useful for product experiment product research and development characteristic analysis Perform the foll
14. cancel the change of GPIB Adddress and return back to the current output 21 page 4 1 6 FileNum Select the current File number for storing and reloading the parameters and configurations Up to 5 sets of configurations can be saved in FileNum 1 to 5 User can save the different sets of scan point values to different file for later use Following parameters and states are stored in the file 1 The default StartTo mode when TH1775 is powered on 2 Parameters set in the Option menu 3 Output current value lo for Single Out mode 4 Current point values for MultScan mode 5 Current value of I and le for Equ Scan mode 6 Scan Delay time 0 to 99s 7 AutoScan mode Manual Auto 8 Return mode Not Return 9 Scan Numbers 2 to 15 Note All parameters are saved automatically in the current FileNum when they are modified Perform the following procedures to select a FileNum and reload the configurations 1 Press Opt key from the output display page to enter the lt Set Option gt display page 2 Press or key to switch to the FileNum menu item The current FileNum will be displayed as shown in the following figure 3 Press or key to select a FileNum to reload from 1 to 5 4 Press d key to confirm the FileNum selection and reload the configurations TH1775 will return back to the current output page 5 Press key to cancel the FileNum selection and the configurations will not be loaded TH1775 will re
15. current value out of the maximum value is inputted Data Out error message will be displayed TH1775 will return back to the lt Input Data gt page in step 5 Try to enter the right current value again Theut Data Data Out d 7 Press key to cancel the input value and return back to the current output page 8 Use or key to select the end current le 9 Repeat step 4 to step 7 to input the end current le 4 3 4 Dela Set the Scan Delay for MultScan or Equ Scan mode when AutoScan is set to Auto mode Perform the following steps to set the Scan Delay time 1 Press Mode key to select the MultScan or Equ Scan mode 2 Press Dela key to enter the lt Input Data gt display page as shown in the following figure 3 Use the numeric keys 9 J 2 B LJ 5J e 7 e 9 to input the delay time from O to 99s 4 Press d key to confirm the input value and return back to the current output page 5 Press key to cancel the input value and return back to the current output page 4 3 5 Retu Loop function can be enabled to analyze the characteristics of magnetic materials When loop function is on Return 1 the multi current will be outputted like this Start gt l4 gt l2 gt gt In4 gt In gt In1 gt gt 12 gt l4 gt End Perform the following steps to turn on off the loop function 1 Press Mode key to select the MultScan or Equ Scan mode 28 Press Retu key to enter
16. d again there may be something wrong inside the TH1775 Please connect our company or service center for help 34
17. dicators FWD indicates that a forward current is being outputted REV indicates that a reverse current is being outputted RESET button Press RESET button to interrupt a bias current output immediately UNKNOWN terminals UNKNOWN terminals are used to connect a device under test Hcur High terminal of current drive Hpot High terminal of potential sense Lpot Low terminal of potential sense Lcur Low terminal of current drive Hcur and Hpot terminals are connected to a red clip Leur and Lpot terminals are connected to another black clip COMMON terminal This is the COMMON terminal which is tied to the instrument s chassis and which can be used for measurements that require guarding GND This is the GND terminal which is tied to the instrument s chassis and which can be connected to a protective earth ground to protect from electrical shock LCR terminals Connect these LCR terminals to the Unknown terminals of a LCR meter using the TH26004E 1 accessory Make sure that every terminal is connected to its corresponding terminal HD of TH1775 is connected to Hcur HD of a LCR meter HS of TH1775 is connected to Hpot HS of a LCR meter LS of TH1775 is connected to Lpot LS of a LCR meter LD of TH1775 is connected to Lcur LD of a LCR meter Slave Indication Indicate that a slave instrument is connected successfully 16 3 2 1 2 3 4 5 6 7 8 Rear Panel Description GPIB AC
18. e following figure 2 Press or key to set StartTo to Singl Mult or Equal NH StartTo Singl Set the Single Out mode as the default current output mode m StartTo Mult Set the MultScan mode as the default current output mode NH StartTo Equal Set the Equ Scan mode as the default current output mode 3 Press d key to confirm and save the change of StartTo and return back to the current output page When TH1775 is turned on the specified StartTo mode you have just set will be displayed 4 Press key to cancel the change of StartTo and return back to the current output page 5 Whatever default current mode you have selected you still can switch the output mode by pressing the Mode key directly However the default mode of StartTo will not be changed by pressing the Mode key 4 1 2 FootMode Perform the following procedures to set up the footswitch control mode 1 Press Opt key from the output display page to enter the lt Set Option gt display page 2 Press key to select the FootMode menu item The current control mode will be displayed as shown in the following figure 3 Press or key to select Trig Hold or OFF control mode FootMode OFF Footswitch is disabled FootMode Trig Trig Operation Step on the footswitch and then loose your foot to accomplish a trigger action For Single Out mode the first footswitch trigger action same as START button pressing will start the bi
19. e setups are listed below and the following display page will be displayed NH Manual operation mode NH Scan Numbers 6 Loop function disabled m FootMode Trig HultScaniH 5 li 1 4 He hae Connect the device to the UNKNOWN terminals Press START or trigger the footswitch to start the bias current output Read the measurement result from the LCR meter Press START or trigger the footswitch to the next current point Repeat step 10 and 11 until all current points are finished Press RESET button to end the measurement at any time Disconnect the device under test Repeat step 8 to step 14 to test other devices 31 4 5 Equ Scan Mode For Equ Scan mode you don t have to input the values for all current points Only Is and I are required be inputted The TH1775 will automatically calculate the value for each point according to equal current interval rule For example if Scan Numbers is N start current is ls and end current is le We can calculate the current values for each point l4 ls l2 ls le ls N 1 In ls n 1 le ls N 1 In ls N 1 lela N 1 le From 2 to 15 different bias currents can be set TH1775 will output the bias currents in the order ls lo In le with a delay time from O to 99 seconds between different current points Auto mode For some special measurement need loop current function can be used Perform following steps to measure a device in Equ Scan and Auto mode 1 P
20. eries 1 7 Accessories E TH26004E 1 Test Fixture TH26004E 1 Test Fixture used to connect the TH1775 with the L or LCR meter TONGHUI TH26004E 1 TH26004E 1 ELECTRONICS TEST FIXTURE eS ceed TEST FUTURE 1TH26013 DC Bias Test Clip Leads TH26013 DC Bias Test Clip Leads is used to connect the Device Under Test 1TH2881 001 Footswitch TH2881 001 Footswitch can be efficiently used to start the bias current output instead of key operation from the front panel Chapter 2 Installation and Preparation 2 1 Operation Environment 2 1 1 Temperature and Humidity Don t use the instrument in a dusty or vibrating location Don t expose the instrument under sunlight or corrosive gas Be sure that the operation temperature is between O Cand 40 C and that the relative humidity is below 80 2 1 2 Ventilation Requirments To void internal temperature increase under large bias current output make sure that there is adequate clearance more than 20 cm around the TH1775 and adequate ventilation is ensured Never block the ventilation windows especially on both sides and below Rear Window 2 TH1775 Front Panel Bottom Window Right Window 2 1 3 Line Voltage Regulation The instrument has been carefully designed to reduce the disturbance from the AC line input It is recommended to be used in a low noise environment If the noise is inevitable please use a proper power filter or a line voltage re
21. g current value from the amperometer and the setup current value displayed on the TH1775 Check the measuring impedance of short circuit open circuit short correction open correction and standard samples when TH1775 is connected and without current output as shown in the following figure From the measuring impedance values above you will see if the instruments are connected and working normally In general short circuit impedance should be as low as possible and open circuit impedance should be as large as possible The measuring results when bias current is disabled should be consistent with the results measured directly by a L LCR meter 13 3 1 1 2 3 4 Chapter 3 Panel Description Front Panel Description 10 11 1 2 3 FROM LCR METER El TONGHU GND HD HS Ls LD euccrronios TH1775 BIAS CURRENT SOURCE 0 20A POWER r r 2 TURN BIAS CURRENT OFF BEFORE DISCONNECTING DEVICE UNDER TEST FROM TEST CABLE 2X DEVICE UNDER TEST AND TERMINALS MAY BECOME HOT DUE TO HIGH POWER DISSIPATION OF THE DUT SLAVE FWD REV s1 PE wom a RESET START COM Hour Hror Lror Lour OIG Brand and Model LCD Display 2x20 character LCD display the working conditions and setup parameters are displayed Power Switch In the 1 position all operating voltages are applied to the instrument In the 0 position NO operating voltages are applied to the instrument Keyboard
22. gulator TH1775 Regulator L If the instrument will not be used for a long time please store it in the original or similar package box and 2 1 4 Storage keep it from direct sunlight and humidity Power Filter 2 2 Power Line Connection AC LINE o 10A AC 110V 60Hz az 500VA Max RS 2320 o _ Jo FOOT SWITCH 2 2 1 Fuse Selection Use 10A Slow Blow fuse for 95V to 125V line voltage Use only fuses with the required current rating and of the specified type as replacements To prevent electrical shock disconnect the TH1775 power cable from the receptacle before checking or replacing the fuse 2 2 2 Ground the Instrument In accordance with international safety standards this instrument is equipped with a three wire power cable When connected to an appropriate ac power outlet this cable grounds the instrument frame NOTE For protection from electrical shock the power cable ground must not be defeated The power plug must be plugged into an outlet that provides a protective earth ground connection The ground terminal on the front panel can also be grounded 2 3 Footswitch Connection Connect the foot switch when it is needed There are two control modes for foot switch please refer to the description late in this manual 10 2 4 Turn On the Power m Follow the following steps to turn on the both instruments when TH26004E 1 and TH26013 is not connected 1 a BR WN Turn
23. nsions 430 width x180 height x460 depth mm 1 3 14 Weight Approx 15kg 1 4 Basic Accuracy 1 4 1 Accuracy Test Requirements Within one year factory calibration Environment temperature 25 5 C Relative Humidity lt 80 Power is regulated by a line voltage regulator Warm up time more than 30 min 1 4 2 Current Accuracy Range Current Accuracy Resolution 200mA 0 0mA to 200 0mA 0 1mA 2A 0 201A to 2 000A 1 3digits 0 001A 20A 2 001A to 20 00A 0 01A 1 5 Additional Error for LCR Meter An additional measurement error should be added to the basic error of the LCR meter when the LCR meter is used with a bias current source The additional measurement error is induced by attenuation of test signal source disturbance and non ideal coupling and so the reading stability will be decreased NOTE There may be a resonance frequency point between the bias current source and the inductor under test Around the resonance frequency point the measurement result will be different so try best to avoid the very resonance frequency point 1 5 1 Additional error calculation Basic additional error is 1 and the error will be increasing with the value of impedance under test Use the following formula to calculate the additional error Ze H1 1 kI kf kil 1 Zx 2k0 Zx Unknown impedance of Zx 2rrfL 2 ki Bias current factor 3 kl Unknown inductance factor
24. oing chapters have introduced the basic of using this instrument This chapter will tell you how to set the functions and parameters through the keyboard to meet different measurement requirements When all functions and parameters have been finished operation will become very simple Just press the START or RESET buttons to perform the measurement sometimes only a footswitch is needed NOTE Functions and parameters can only be set when bias current is OFF 4 1 Option Menu Not all items in the Option menu are necessary for TH1775 but the setups will make your measurement more convenient and efficient For example you can select the footswitch control mode as you like and set the proper Scan Delay time you want Press OPt key to enter the display page of lt Set Options gt in the Option menu as shown in the following figure Set Options in the first line indicates current display page The item displayed on the left of is the current menu item to be modified The value or option of current item is displayed on the right of The arrow marks displayed on the bottom right screen remind you to select a menu item using the or key and to change the value of the current menu item using the or key 4 1 1 StartTo Perform the following steps to set the default output current mode when TH1775 is turned on 1 Press Opt key from the output display page to enter the lt Set Option gt display page as shown in th
25. on the L meter or LCR meter Set up the working conditions for LCR meter Turn on the TH1775 bias current source Connect the TH1775 and the LCR meter with TH26004E 1 as shown in the following figure Connect TH26013 test clip leads to the TH1775 as shown in the following Figure a e SS Cp 29 0780 E o a ms E Some L LCR meters will not pass the power on self test with a bias current source connected to their UNKNOWN terminals Follow the following steps to turn on the instruments when TH26004E 1 and TH26013 are connected 1 wo N A 5 2 5 Disconnect the TH26004E 1 for one end Turn on the LCR meter and then the TH1775 Connect the TH26004E 1 again If you do want to turn on the instruments when they are connected please turn on the TH1775 first and then turn on the L LCR meter On the contrary if you want to turn off the instruments when they are connected please turn off the L LCR meter first and then turn off the TH1775 Correction after Connection TH1775 is a Bias current source with low additional errors Some L LCR meters will fail in OPEN correction because of their lower noise allowance capability At this time please perform the OPEN correction without connecting with the TH1775 The accuracy being affected will be within the specifications if the impedance of UNKNOWN is less than 10 KQ For OPEN and SHORT correction operation please refer to the user s manual of the LCR meter 11 Open
26. owing procedures to turn on off the OutTuner function 1 Press Opt key from the output display page to enter the lt Set Option gt display page 2 Press or key to switch to the OutTuner menu item The current setup will be displayed as shown in the following figure 3 Press or key to turn on or off the OutTuner function m OutTuner OFF Turn off the OutTuner Function m OutTuner ON Turn on the OutTuner function 4 Press d key to confirm and save the change of OutTuner and return back to the current output page 5 Press key to cancel the change of OutTuner and return back to the current output page 4 1 4 BusMode Perform the following procedures to set up the BusMode 1 Press Opt key from the output display page to enter the lt Set Option gt display page 2 Press or key to switch to the BusMode menu item The current setup will be displayed as shown in the following figure 3 Press or key to set the BusMode to LCR GPIB RS232 or OFF mode Note 4 5 4 1 5 E BusMode LCR When BusMode is set to LCR TH1775 is connected by a LCR meter through the RS232 interface and the bias current output can be set and controlled through the LCR meter When BusMode is set to LCR mode the lt Set Options gt display page will be displayed instead of output display page after Power is on You can set the BusMode to other modes from the lt Set Options gt page When BusMode is selected the ke
27. parameters modified in the Option Menu to the current FileNum file Press key to cancel the parameters modified in the Option Menu F R key F R is the current forward and reverse switching key This key is valid only when Single Out mode is selected and the bias current output is started All above key operations except F M key is available only when the bias current output is not started d key Press d key to confirm the modification with the parameters Press key to cancel or exit the parameter setup key Press key to delete one last character of the input value This key can only be used when output current Scan Numbers or Scan Delay time is to be inputted Numeric Keys 0 0J 23 653 43 5 6 73 66 e The numeric keys are used to input a data For example when bias current Scan Numbers or Scan Delay time is to be inputted Cursor Keys 0608 The cursor keys are only available when corresponding symbols 4 gt 4 y are displayed on the LCD screen The cursor keys can be used to select a scan current point which you want to modify The cursor keys can also be used to adjust the Single Out current value finely Finally the cursor keys can be used in Option menu to switch between option menus and to set the parameters for each menu 15 5 6 7 8 9 10 11 12 START button Start a current output or change to the next scan output current point Current output in
28. ress Mode key to select the Equ Scan mode 2 Press Auto key to select the Auto scan mode referring to paragraph 4 3 1 3 Press Step key to set the Scan Numbers referring to paragraph 4 3 2 4 Press Setl key to set the current value for I and le referring to paragraph 4 3 3 5 Press Dela key to set the Scan Delay time referring to paragraph 4 3 4 6 Press Retu key to set the loop function referring to paragraph 4 3 5 7 Set the footswitch mode to Trig mode 8 The setups are listed below and the following display page will be displayed NH Auto operation mode Scan Numbers 6 Scan Delay 5 sec Loop function enabled FootMode Trig E gt K gt eese ES Goant H oe o i p f I a 1 a I k m j sal 9 Connect the device to the UNKNOWN terminals 10 Press START or trigger the footswitch to start the bias current output The current points will be outputted automatically in the following order START gt l gt Delay gt l gt Delay gt _ lo Delay Is Delay Je gt Delay gt l gt Delay gt Over rT A iE sesle mento 11 START button or footswitch can both be used to skip the delay time and switch to the next point directly 12 Read the measurement results from the LCR meter 32 13 Press RESET button to end the measurement at any time 14 Disconnect the device under test 15 Repeat step 9 to step 14 to test other devices
29. start the bias current output Trig the footswitch once to start the bias current output FootMode Trig Step on the footswitch and hold on to enable the bias current output FootMode Hold If the lo value is more than 20A and the slave instrument is not connected Slave1 NotReady will be displayed as shown in the following figure Slavel HotReasdu 23 A forward current is outputted when LED FWD is ON Message Run will be displayed at the bottom right corner of the LCD indicating that the bias current is ON as shown in the following figure 8 Press F R key to change the current direction between FWD and REV When a reverse current is outputted LED REV will be lighted as shown in the following figure 9 The indications of arrow keys will be displayed on the right of the current output value if the OutTuner function is on Use the or key to select one of the last two digits to be changed and a cursor will be blinking under the digit to be changed Once a digit has been selected press or key to increase or decrease the current output value 10 Read the measuring results from the LCR meter 11 Press RESET button to interrupt the bias current output Trig the footswitch once again to interrupt the bias current output FootMode Trig Loose the footswitch to interrupt the bias current output FootMode Hold 12 Disconnect the device under test 13 Repeat step 6 to 12 to measure other
30. the lt Set Return gt display page as shown in the following figure Press GJ to select the Return mode or press to select the Not mode Press dl key to confirm the setup and return back to the current output page Press Ej key to cancel the setup and return back to the current output page If Return mode is selected R will be displayed on the top right of the LCD as shown in the following figure 29 4 4 MultScan Mode TH1775 s MultScan Mode permits user to measure the device over different DC bias current points It s very useful if you want to analyze the characteristics of some kind of magnetic materials From 2 to 15 different bias currents can be set TH1775 will output the bias currents in the order h la with a delay time from O to 99 seconds between different current points Auto mode For some special measurement needs loop current function can be used Perform following steps to measure a device in MultScan and Auto mode Press Mode key to select the MultScan mode 2 Press Auto key to select the Auto scan mode referring to paragraph 4 3 1 3 Press Step key to set the Scan Numbers referring to paragraph 4 3 2 4 Press Setl key to set the current value for each point referring to paragraph 4 3 3 5 Press Dela key to set the Scan Delay time referring to paragraph 4 3 4 6 Press Retu key to set the loop function referring to paragraph 4 3 5 7 Set the footswitch mode
31. the numeric keys to input the Scan Numbers from 2 to 15 Press lt Backspace key to delete the digit before the cursor 4 Press d key to confirm the input and return back to the former display page If the input number is out of the range from 2 to 15 TH1775 will clear the wrong scan number and require you to input again 5 Press key to cancel the input and return back to the former display page 4 3 3 Setl Set the output current values for Single Out MultScan and Equ Scan modes Perform the following steps to set the lo current for Single Out mode 1 Press Mode key to select the Single Out mode 2 Press Setl key to enter the lo lt Input Data gt display page as shown in the following figure 3 Use the entry keys o A 2 B al 5 e 7 e 9 LJ LJ mA to set up the current value from 100A to 100A 4 Press d key to confirm the lo value and return back to the current output page If a current value out of the maximum value is inputted Data Out error message will be displayed TH1775 will return back to the lt Input Data gt page in step 2 Try to enter the right current value again 5 Press key to cancel the Io value and return back to the current output page 26 Perform the following steps to input the current values from I tol for MultScan mode Press Mode key to select the MultScan mode 2 Set the Scan Number for MultScan mode first 3 Use or key to
32. the test terminals as shown in the following figure to perform the OPEN correction for LCR meter Short the test terminals as shown in the following figure to perform the SHORT correction for LCR meter 2 6 Check the Instruments Before Use After turning on the instruments make some simple tests to ensure that the instruments are working normally E It will be reseted internally initialized and self tested when TH1775 is turned on At first the FWD REV and the slave indicators will be turned ON the instrument and manufacturer information will be displayed for several seconds as shown in the following figure THirrs 268 OCC Bisse KC gt TonS3Hui VER1 1 05 E TH775 will finish its power on operation until the FWD REV and the slave indicators are turned off The output display page will be displayed after the information display page is cleared as shown in the following figure 12 TH1775 will be working in the Single Out output mode by factory default If the user has changed the configuration in the OPTION menu then TH1775 will be working in the mode user specified and the output current value and parameters set last time will be displayed Connect an amperometer to the UNKNOWN terminals as shown in the following figure When output current is not enabled there is no current outputted AMPEREMETER Press START button to enable current output and the setup current will be outputted Compare the measurin
33. turn back to the current output page 4 1 7 Calibration Calibration function is not available for common users which can only be used by qualified personals in the calibration laboratory of Tonghui 4 2 Single Out Mode Single Out mode is the most commonly used output mode A single current is outputted after the TH1775 is started If you want more than one current please select the MultScan or Equ Scan mode Perform the following steps to measure a DUT using Single Out mode 1 Use the Mode key to select the Single Out mode as shown in the following figure Stop at the bottom right means that the bias current has not been started lo is the present output current value Press Setl key to set the output current value The lt Input Data gt display page will be displayed as shown in the following figure Use the entry keys 0 RE 02 03 CS 65 06 7 8 I ma to set up the current value from 100A to 100A Press d key to confirm the I value and return back to the current output page If a current value out of the maximum value is inputted Data Out error message will be displayed for a while TH1775 will return back to the lt Input Data gt page in step 2 Try to enter a correct current value again Theut Data 7 Data Out d Press key to cancel the lo value and return back to the current output page Connect the device under test to the UNKNOWN terminals of TH1775 Press START button to
34. verload message will be displayed as shown in the following figure Master Overload Please FESET The possible reasons for overload lt gt The UNKNOWN terminals are open circuit when TH1775 is started to output a bias current lt The resistance of DUT is too large to be tested The voltage V IR exceeds the maximum output voltage of TH1775 The output bias current does not reach the required current value within 1 second when a large inductance is tested under a large bias current lt TH1775 may be broken down and needs to be repaired If the overload error message is disappeared after the UNKNOWN terminals are shorted directly which means TH1775 is working normally The reason for overload must be among the first three reasons listed above The current device under test can not be measured under this bias current value Try to measure it under a lower bias current 4 6 2 Unbal TH1775 adopts a special balancing technology to meet the need of 4 terminal test theory of a L LCR meter Once error message Master Unbal is displayed this means that TH1775 fails to accomplish overlap current measurement and bias current output will be disabled as shown in the following figure Hazter rbal Plezze RESET Press RESET key to clear the error message first Check the connection with the LCR meter and short the UNKNOWN terminals directly Try to start the bias current again If the Master Unbal error message is displaye
35. yboard will be forbidden on the output display page If you want to change the BusMode just turn off the instrument and turn on the instrument again and then change the BusMode from the lt Set Options gt display page BusMode GPIB When BusMode is set to GPIB TH1775 will be controlled through the GPIB interface which is an option Another computer fixed with a GPIB interface card is required to control the TH1775 Operation manual for GPIB interface will be provided together with the GPIB option E BusMode RS232 When BusMode is set to RS232 TH1775 will be connected and controlled by a computer BusMode OFF When BusMode is set to OFF TH1775 can only be operated from the front panel Press d key to confirm and save the change of BusMode and return back to the current output page Press key to cancel the change of BusMode and return back to the current output page GPIB Address Set the GPIB address for this TH1775 from 1 to 31 Perform the following procedures to set the GPIB Address 1 2 Press Opt key from the output display page to enter the lt Set Option gt display page Press or key to switch to the Address menu item The current setup will be displayed as shown in the following figure Set OrtLionss 4 Address 31 Press or key to set the GPIB Address from 1 to 31 for TH1775 Press el key to confirm and save the GPIB Address and return back to the current output page Press EJ key to
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