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1. d WRONG 4T CONNECTION Figure 4 4 e 4 Terminal Path ATP 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 4 5 The return current will flow through the coaxial cable as well as the shield Therefore the magnetic flux that generated by internal conductor will cancel out the magnetic flux generated by external conductor shield The 4TP connection increases the measurement range from 1 to 25 Hcun b BLOCK DIAGRAM Hcun AT DUT Te 1m 10100 1 10 100 1K 10K 100K 1M 10M TYPICAL IMPEDANCE MEASUREMENT 9 4T CONNECTION WITH SHILDING Figure 4 5 e Eliminating the Effect of the Parasitic Capacitor When measuring the high impedance component i e low capacitor the parasitic capacitor becomes an important issue Figure 4 6 In figure 4 6 a the parasitic capacitor Cd is paralleled to DUT as well as the Ci and Ch To correct this problem add a guard plane Figure 4 6 b in between H and L terminals to break the Cd If the guard plane is connected to instrument guard the effect of Ci and Ch will be removed HCUR HPOT LPOT LCUR HCUR HPOT LPOT LCUR Guard Plant a TR Point a Parastic Effect b Guard Plant reduces Parastic Effect Figure 4 62. 0 1 Ohm gt 20mA 10 Ohm x 20mA 3 Diode Audible Continuity Checks Open Circuit Voltage 5Vdc Short Circuit Current 2 5mA e lt 250 e Beep Off 2500 4 LCR Measurements e conditions 1 Frequency 100Hz 120Hz 1KHz 10KHz 100KHz 200KHz 2 Level 1Vrms 0 25Vrms 50mVrms 1VDC DCR only Measurement Parameters Z Ls Lp Cs Cp DCR ESR D Q and 0 Basic Accuracy 0 1 Dual Liquid Crystal Display Auto Range or Range Hold USB Interface Communication Open Short Calibration Primary Parameters Display Z AC Impedance DCR DC Resistance 5 Serial Inductance Lp Parallel Inductance Cs Serial Capacitance Cp Parallel Capacitance Second Parameter Display 7 Phase Angle ESH Equivalence Serial Resistance D Dissipation Factor Q Quality Factor e Combinations of Display Serial Mode 2 9 Cs D Cs Q Cs ESR Ls D Ls Q Ls ESR Parallel Mode Cp D Cp Q Lp D Lp Q 1 2 Impedance Parameters Due to the different testing signals on the impedance measurement instrument there are DC and AC impedances The common digital multi meter can only measure the DC impedance but the MT4090 can do both It is very important to understand the impedance parameters of the electronic components When we analysis the impedance by the impedance measurement plane Figure 1 1 it can be visualized by the real element on the X axis and the imaginary element on the y a
3. 1 KHz 10 KHz 100 KHz or 200 KHz may be selected on all applicable ranges One of the test voltages 50mVrms 0 25 Vrms 1 Vrms or 1 VDC DCR only may also be selected on all applicable ranges The dual display feature permits simultaneous measurements When DC AC voltage current measurement mode or the Diode Audible Continuity Check mode is selected only the secondary display will be used to show the result of the measurement The highly versatile MT4090 can perform virtually all the functions of most bench type LCR bridges With a basic accuracy of 0 1 this economical LCR meter may be adequately substituted for a more expensive LCR bridge in many situations Also with the basic accuracy of 0 496 in voltage and current measurements the MT4090 performs the functions of a general purpose Digital Multi Meter and can be used to replace the DMM on a service bench The MT4090 has applications in electronic engineering labs production facilities service shops and schools It can be used to check ESR values of capacitors sort and or select components measure unmarked and unknown components and measure capacitance inductance or resistance of cables switches circuit board foils etc The key features are as following 1 Voltage Measurements True RMS up to 600Vrms 40 1K Hz e upto 600V Input Impedance 1M Ohm 2 Current Measurements True RMS up to 2Arms 40 1K Hz DC upto2A Current Shunt
4. Checksum 02 09 data_code amp amp 02 09 5 0 B1 S B2 S B3 5 0 5 1 5 2 S B3 CS e Remote Mode When in the Remote mode the RMT on the LCD will be lit and the MT4090 is capable of communicating to remote USB equipped PC or terminal through the build in USB port The connection setting is as follow Transmission Mode Half Duplex Baud Rate 9600 Parity Bit None Data Bits 8 otop Bit icd Handshake None In this mode the LCD display and all keypads except the button will be locked And the external program through the USB port controls the operation of the MT4090 3 1 Remote Mode Command Syntax The command syntax of Models 4090 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 PARAMETER should use only ASCII string not numerical code 3 Value parameter can be integer floating or exponent with the unit For example 5O0mV 0 05V 5 0e1mV 4 The question mark at the end of COMMAND means a query or a measuring command For example CpD sets the measurement mode to Cp and D CpD sets the measurement mode to Cp and D as well as measures the values and send them back 5 The COMMAND and PARAMETER can be either upper or lower case But the unit to describe the value in the PARAMETER should have different between milli m and mega M For exam
5. c TYPICAL IMPEDANCE MEASUREMENT RANGE Q Figure 4 1 e 3 3T 3 Terminal uses coaxial cable to reduce the effect of the parasitic capacitor Figure 4 2 The shield of the coaxial cable should connect to guard of the instrument to increase the measurement range up to 1 Hcur HPor DUT DUT Co doesn t effect measurement result a CONNECTION BLOCK DIAGRAM 3T 4 gt 1m 10m 100m 1 10 100 10K 100K1M 10M TYPICAL IMPEDANCE MEASUREMENT RANGE Q DUT d 2T CONNECTION WITH SHILDING Figure 4 2 e 4 Terminal 4T 4 Terminal connection reduces the effect of the test lead resistance Figure 4 3 This connection can improve the measurement range down to 10m amp However the effect of the test lead inductance can t be eliminated 24 HPor b BLOCK DIAGRAM 4 4 im 10m 100m 1 10 100 1K 10K 100K1M 10M c TYPICAL IMPEDANCE MEASUREMENT RANGE 0 Figure 4 3 e 5 Terminal 5T 5 Terminal connection is the combination of 3T and 4T Figure 4 4 It has four coaxial cables Due to the advantage of the and this connection can widely increase the measurement range for 10 to 10 Hcur DUT LPoT L b BLOCK DIAGRAM 5T im 10m 100m 1 10 100 10K 100K 1M 10M TYPICAL IMPEDANCE MEASUREMENT RANGE 0 DUT
6. 4 2 Open Short Compensation For those precision impedance measuring instruments the open and short compensation need to be used to reduce the parasitic effect of the test fixture The parasitic effect of the test fixture can be treated like the simple passive components in figure 4 7 a When the DUT is open the instrument gets the conductance Gp joCp Figure 4 7 b When the DUT is short the instrument gets the impedance Zs Hs joLs Figure 4 7 c After the open and short compensation the MT4090 has Yp and Zs that can then be used for the real Zdut calculation Figure 4 7 d 26 Parastic of the Test Fixture Redundant Zs Parastic Yo Impedance Conductance Condugtance Hcur Rs Ls Zm Co Go Zdut POT Parastic Effect of the Test Fixture Hcun Yo Go 0 Co 1 SS NIU b OPEN Measurement Rs Ls HPor Zs Co Go SHORT POT Zs Hs 0 Ls c SHORT Measurement 25 HEN Zm Zs Zm zate e SNO d Compensation Equation Figure 4 7 4 3 Selecting the Series or Parallel Mode According to different measuring requirement there are series and parallel modes to describe the measurement results It is depending on the high or low impedance value to decide what mode to be used Capacitor The impedance and capacitance in the capacitor are negatively proportional Therefore the larger capacit
7. Range Hold Key LPOT Terminal HPOT Terminal DOV ACV Function Key HCUR Terminal Diode Continuity Function Key COM Terminal V Diode Continuity Terminal 24 26 USB Port 2A Fuse 2 2 Making Measurement 2 2 1 Open and Short Calibration The MT4090 provides open short calibration capability so the user can get better accuracy in measuring high and low impedance We recommend that the user perform open short calibration if the test level or frequency has been changed Open Calibration First remaining the measurement terminals at the open status press the key then the LCD will display gt ron LIL LI D Frequency Hz Test Level V This calibration takes about 15 seconds After it is finished the MT4090 will beep to show that the calibration is done e Short Calibration To perform the short calibration insert the Shorting Bar into the measurement terminals Press the key then the LCD will display FP Lr 1 Lit f F Em 4 b nud dme A Level V Frequency Hz Test This calibration takes about 15 seconds After it is finished the MT4090 will beep to show that the calibration is done 2 2 2 Relative Mode The relative mode lets the user to make a quick sort of a bunch of components First insert the standard value component to get the standard value reading Approximately 5 seconds to get a stable reading Then press t
8. mOhm 17 Ohm 18 KOhm 19 MOhm 20 mV 21 V 22 mA 23 A 24 Example RANG pF OK e RANG Return the current measurement unit setting Example ASC ON OK RANG pF return value 22 ASC OFF OK RANG 0 return value READ Return the measurement value This command will perform a measurement according to the current measurement mode and return the measured value Example CPD OK READ 0 22724 0 12840 return value DCR OK READ 5 1029 return value ACV measurements will send only one measured value The other measurement modes will send two measured values separated by space ASCII 20H 23 4 Application 4 1 Test Leads Connection Auto balancing bridge has four terminals Hcur and to connect to the device under test DUT It is important to understand what connection method will affect the measurement accuracy e 2 2T 2 Terminal is the easiest way to connect the DUT but it contents many errors that are the inductance and resistance as well as the parasitic capacitance of the test leads Figure 4 1 Due to these errors in measurement the effective impedance measurement range will be limited at 1000 to 10KQ Hcur a DUT V col pur b BLOCK DIAGRAM m A lt gt 1m 10m 100m 1 10 100 10K 100K 1M 10M
9. the product is set to match the available line voltage is installed SAFETY SYMBOLS Caution risk of electric shock Earth ground symbol Equipment protected throughout by double insulation or reinforced insulation gt gt Caution refer to accompanying documents DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to a qualified dealer for service and repair to ensure that safety features are maintained INSTRUMENTS WHICH APPEAR DAMAGED OR DEFECTIVE SHOULD NOT BE USED PLEASE CONTACT MOTECH INDUSTRIES INCORPORATED FOR INFORMATION ON REPAIRS 30 MOTIS MOTECH INDUSTRIES INC 6 F No 248 Sec 3 Pei Shen Rd Shen Keng Hsiang Taipei Hsien 222 Taiwan Tel 886 2 26625093 886 2 26625194 Fax 886 2 26625097 E mail instrument omotech com tw _ http www motech com tw ZOMG 409ME 2
10. 1mH 1 591mH 100Hz 15 91KH 1591H 159 1H 15 91H 1 591H 159 1mH 1 591mH 159 1uH 295 1 196 1 0 5 1 0 296 1 0 1 1 0 290 1 0 5 1 1 1 26 52KH 13 26 1326H 132 6H 13 26H 1 326H 132 6mH 1 326mH 120Hz 13 26KH 1326H 132 6H 13 26H 1 326H 132 6mH 1 326mH 132 295 1 196 1 0 5 1 0 2 1 0 196 1 0 296 1 0 5 1 1 1 3 183KH 1 591KH 159 1H 15 91H 1 591H 159 1mH 15 91mH 159 1uH 1KHz 1 591KH 159 1H 15 91H 1 591H 159 1mH 15 91mH 159 1uH 15 91uH 2 1 199 1 0 5 1 0 276 1 0 196 1 0 296 1 0 596 196 1 e 1 e 318 3H 159 1H 15 91H 1 591H 159 1mH 15 91mH 1 591mH 15 91uH 10KHz 159 1H 15 91H 1 591H 159 1mH 15 91mH 1 591mH 15 91uH 1 591uH 59 5 1 2 1 0 5 1 0 296 1 0 196 1 0 2 1 0 5 1 1 1 31 83 15 91 1 591 159 1mH 15 91mH 1 591mH 159 1uH 1 591uH 100KHz o 15 91H 1 591H 159 1mH 15 91mH 1 591mH 159 1uH 1 591uH 0 159UH 15 91H 7 957H 795 7mH 79 57mH 7 957mH 795 7uH 79 57uH 0 79 200KHz o 957H 795 7mH 79 57mH 7 957mH 795 7uH 79 57uH 0 795uH 0 079uH D Accuracy 20M 10 1M 1100 10 1 100 11 1 0 1 10M 1M 100K 10K 1K 100 Q Q 100 2 0 020 0 010 0 005 0 002 0 002 0 002 0 005 120 2 9 10KH
11. EE 15 22 REMOTE MODE C OMMAND O SR debe aident Ux 18 S REMOTE MODE COMMANDS cents Duet btt E od tm tibia tia id fare ibt abe bu 18 EP SES UOCE 24 1 CONNECTION m 24 PEN SHORE COMPENSATION step a enrich tsa DN ch uc cc tse ue enc ud el ea sc 26 T3 VOELECTING THE SERIES Of ARAL EL MODE 27 Se ONE YEAR WARRANTY 29 30 1 Introduction 1 1 General The Motech Industries MT4090 Synthesized In Circuit LCR ESR Meter is a high accuracy test instrument used for measuring inductors capacitors and resistors with a basic accuracy of 0 196 Also with the built in functions of DC AC Voltage Current measurements and Diode Audible Continuity checks the MT4090 can not only help engineers and students to understand the characteristics of electronics components but also being an essential tool on any service bench The MT4090 is defaulted to auto ranging However it can be set to auto or manual ranging by pressing the Range Hold key When LCR measurement mode is selected one of the test frequencies 100 Hz 120 Hz
12. Incorporation will without charge repair or replace at its option defective product or component parts Return product must be accompanied by proof of the purchase date in the form and the sales receipt Exclusions this warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alternations or repairs It is void if the serial number is alternated defaced or removed Motech Industries Incorporation shall not be liable for any consequential damages including without limitation damages resulting from loss of use This warranty gives you specific rights and you may have other rights which vary from location to location 29 6 Safety Precaution SAFETY CONSIDERATIONS The Models 4090 LCR Meter has been designed and tested according to Class 1B or 2 according to EN61326 1997 EN55022 EN61000 3 2 3 EN61000 4 2 3 4 5 6 11 EN61010 1 2001 EN61010 2 031 1995 Safety requirement for Electronic Measuring Apparatus SAFETY PRECAUTIONS SAFETY NOTES The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument The manufacturer assumes no liability for the customer s failure to comply with these requirements BEFORE APPLYING POWER N Verify that
13. MT 4090 LCR Meter COM FUSED tHz T 2 4 1 Discharge capacitor before measurement Y 0 PE RAI ON M AN IMI 4090 LCR Meter METIS Contents E 1 iX AS EDIE T ae 1 1 2 IMPEDANCE PARAMETERS conto taeda qucd vnda onov ornamenta cuta antec Dec aant acd ce ti Se et aere ors doter 2 iom o EG m 3 POOF SCORE aa ec H 11 all 24 N ee ee eR ee eee 12 CRIP MON 12 2 2 MARING MEASUREMENT z iaiia eM DU BUR 13 221 Openana MOr GWION 19 222 c russe 13 229 MOI pide 13 aa nite ad eo 14 229 JACdmpedancedMeasulelTielll e e 14 226 Capacitance MEASUPEMENL ssssessssessesessssessssessssessssessssessssssassssasssssssvsassesassvsassssasassasassasassasausasavsasasasacsasaesasacsasacsasassasacsasassasasess 14 T 14 3s OPERATION auc
14. ample if LCR function Cp with D measurement mode is selected in Auto ranging with Relative Open Short Calibration are turned off and test signal is 1 Vrms in 1 KHz then the command is as following MOD 000001111110001011010010 The results of the measurement that will be sent from the MT4090 to a remote PC will be packed in either 7 byte or 11 byte format When dual data such as Cp with D will be sent the data is packed in 11 byte format shown as following Lead code1 02 Lead code2 09 Data code 8 byte long two 32 bit floating point number format the first 4 byte is the main reading Cp and the second 4 byte is the secondary reading D Checksum 02 09 code amp amp OxOOFF 02 09 1 2 5 0 5 1 S B2 S B3 CS where M Bx and 5 are the four bytes floating point format of main and secondary reading which is sent from the lowest byte first When only main reading such as DCR will be sent the data is packed in 7 byte format described below Lead 02 Lead code2 03 Data code 4 bytes long the 32 bit floating point format of the main reading Checksum 02 03 data_code amp amp OxOOFF When only secondary reading such as will be sent the data is packed in 11 byte format described below Lead 02 Lead code2 09 17 Data code 8 bytes long two 32 bit floating point format of the secondary reading
15. ance means the lower impedance the smaller capacitance means the higher impedance Figure 4 8 shows the equivalent circuit of capacitor If the capacitance is small the Rp is more important than the Rs If the capacitance is large the Rs shouldn t be avoided Hence it is properly to use parallel mode for low capacitance measurement and series mode for high capacitance measurement 27 small capacitor Large capacitor High impedance Low impedance C Bae Rp m Effect No Effect Hs Hs No Effect Effect e Inductor The impedance and inductance of a inductor are positively proportional when test frequency is fixed Therefore the larger inductance equals to higher impedance and vice versa Figure 4 9 shows the equivalent circuit of inductor When the inductance is small the Rs becomes more important than the Rp When the inductance is large the Rp should be taking into consideration Therefore it is properly using series mode to measure an inductor with low inductance and parallel mode to measure an inductor with high inductance Large inductor Small inductor High impedance Low impedance L Re L Rp Effect No Effect Rs Rs No Effect Effect Figure 4 9 28 5 Limited ONE Year Warranty Motech Industries Incorporation warrants to the original purchaser that its product and the component parts thereof will be free from defects in workmanship and materials for a period of one year form the date of purchase Motech Industries
16. charge any capacitor prior to making a measurement since a charged capacitor may seriously damage the meter Effect Of High D on Accuracy A low D Dissipation Factor reading is desirable Electrolytic capacitors inherently have a higher dissipation factor due to their normally high internal leakage characteristics If the D Dissipation Factor is excessive the capacitance measurement accuracy may be degraded It is best to check with the component manufacturers data sheet to determine the desirable D value of a good component Measuring Capacitance of Cables Switches or Other Parts Measuring the capacitance of coaxial cables is very useful in determining the actual length of the cable Most manufacturer specifications list the amount of capacitance per foot of cable and therefore the length of the cable can be determined by measuring the capacitance of that cable 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 Even if the manufacturers specification is not known the capacitance of a measured length of cable such as 10 feet can be used to determine the capacitance per foot Do not use too short length such as one foot because any error becomes magnified in the total length calculations Sometime
17. he key the primary display will reset to zero Remove the standard value component and insert the unknown component the LCD will show the value that is the difference between the standard value and unknown value 2 2 3 Range Hold To set the range hold insert a standard component in that measurement range Approximately 5 seconds to get a stable reading Then by pressing the Range Hold key it will hold the range within 0 5 to 2 times of the current measurement range When the Range Hold is pressed the LCD will display R Frequency Hz Test Level V 2 2 4 DC Resistance Measurement The DC resistance measurement measures the resistance of an unknown component by 1VDC Press the L C Z DCR key to select the DCR measurement The LCD will display DCR Frequency Hz Test Level V 2 2 5 AC Impedance Measurement The AC impedance measurement measures the Z of an unknown device Press the L C Z DCR key to select the Z measurement The LCD will display Lg DOLLS 3 He The testing level and frequency can be selected by pressing the key and key respectively 2 2 6 Capacitance Measurement To measure the capacitance of a component users may be able to press the key to select either Cs Serial Mode or Cp Parallel Mode measurement mode If the serial mode Cs is selected the D Q and ESR can be shown on the seconda
18. iption of the meter Not defined Firmware Version Number Example 200KHz Meter 0 2 000 RST the MT4090 to the power on default status The default status is 1KHz 1Vrms CpD uF After the MT4090 is reset it will return the identity string back ASC Set the format of the return value This command sets the ASCII string return or the numerical code PARAMETER ON ASCII string OFF Numerical code 19 ASC return FREQ 1KHz return ASC OFF OK return FREQ 2 return CORR OPEN Perform the open calibration This command sets the MT4090 to do the open calibration After the calibration is done the MT4090 will return the OK string back CORR SHORT Perform the short calibration This command sets the MT4090 to do the short calibration After the calibration is done the MT4090 will return the OK string back FREQ PARAMETER Set query the measurement frequency e FREQ PARAMETER Set the measurement frequency according to the parameter When setting command is entered the MT4090 will return string after setting is done PARAMETER ASCII string Numerical code 100Hz 0 120Hz 1 1KHz 2 10KHz 3 100KHz 4 200KHz 5 Example FREQ 100KHz OK return e FREQ Return the current measurement frequency setting Example ASC ON OK FREQ 1KHz return value ASC OFF OK FREQ 2 return value LEV PARAMETER Set q
19. mple Example Test Condition Frequency 1KHz L evel 1Vrms DUT 100nF Then Zx E 2 1 2 wm 1 8 2 x 10 100 107 Refer to the 0 accuracy table get 0 m 0 105 deg A Testing Signal Level Accuracy 10 Frequency Accuracy 0 1 Output Impedance 1000 596 General Temperature 0 C to 40 C Operating 20 C to 70 C Storage Relative Humidity Up to 85 AC Power 110 220V 60 50Hz Dimensions 800mm x 220mm x 150mm Lx W x H 11 8 x 8 7 x 5 9 Weight 45009 Considerations When LCR measurement mode is selected the following factors shall be considered Test Frequency The test frequency is user selectable and can be changed Generally a 1 KHz test signal or higher is used to measure capacitors that are 0 01uF or smaller and a 120Hz test signal is used for capacitors that are 10uF or larger Typically a 1 KHz test signal or higher is used to measure inductors that are used in audio and radio frequency circuits This is because these kinds of inductors operate at higher frequencies and require that they shall be measured at a higher frequency Generally inductors with inductances below 2mH should be measured at test frequency of 1 KHz or higher and inductors above 200H should be measured at 120Hz or lower It is best to check with the component manufacturers data sheet to determine the best test frequency for the device Charged Capacitors Always dis
20. nt mode setting or querying command e LpQ Parallel inductance and quality factor measurement mode setting or querying command e LpD Parallel inductance and dissipation factor measurement mode setting or querying command LsRs Serial inductance and serial resistance measurement mode setting or querying command e LsQ Serial inductance and quality factor measurement mode setting or querying command e LsD Serial inductance and dissipation factor measurement mode setting or querying command e RsXs Serial resistance and serial reactance measurement mode setting or querying command e RpXp Parallel resistance and parallel reactance measurement mode setting or querying command e ZTD Impedance and angle Deg measurement mode setting or querying command e ZTR Impedance and angle Rad measurement mode setting or querying command e DCV DC Voltage measurement mode setting or query command e ACV AC Voltage measurement mode setting or query command e DCA DC Current measurement mode setting or query command e ACA AC Current measurement mode setting or query command Example CPD set to Cp D measurement mode OK CPD 0 22724 0 12840 return values 5 1029 return value IDN Query the identity of the MT4090 This command is used to identify the basic information of MT4090 The return value has three fields separated by comma The total length will not greater than 100 characters The fields are Descr
21. oe Y G jB Figure 1 2 1 3 Specification Display Range 1 aee e oon C 0 003pF to 800mF to to 00mV to 600 0 000mA to 2 Accuracy Ae 1 DC Voltage Measurement Range 2V 20V 200V 600V Resolution 1mV 10mV 100mV and 1V 0 4 digits Input Impedance 1 M Ohm 2 AC Voltage Measurement True RMS Range 2V 20V 200V 600V Resolution 1mV 10mV 100mV and 1V Accuracy 0 8 5 digits Input Impedance 1 M Ohm 3 Current Measurement Range 2mA 20mA 200 and 2000 Resolution 10uA 100UA and 1mA Accuracy 0 4 digits Current Shunt 0 1 Ohm gt 20 10 Ohm lt 20 4 AC Current Measurement True RMS Range 2 20mA 200 and 2000 Resolution 10uA 100UA and 1mA Accuracy 0 8 5 digits Current Shunt 0 1 Ohm gt 20mA 10 Ohm x20mA Note The accuracy of voltage current measurements is only applied when in 596 100 of the range 5 LCR Measurement Z Accuracy Ae 20M 10M 1M 100K 10K 100 100 1 1 0 1 10M 100K 10K 1K 0 5 1 0 2 1 0 1 1 0 2 1 0 5 1 1 1 10KHz H u Note 1 The accuracy applies when the test level is set to 1Vrms 2 Ae multiplies 1 25 when the test level is set to 250mVrms Ae multiplies 1 50 when the test level is set to 50mVrm
22. ple 1mV equals 0 001 V 1MV equals 1000000V 6 The end of command character should be placed at the end There are ASCII CR 0DH or ASCII LF 0AH 3 2 Remote Mode Commands Measurement Setting or Querying Command The following measurement mode setting and the query commands are supported in the MT4090 When a mode setting command is entered the MT4090 will return OK follows the ASCII CR and ASCII LF after setting is complete When query command is entered the MT4090 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 If an illegal command is entered there is no response from the meter e DCR DC resistance measurement mode setting or querying command e CpRp Parallel capacitance and parallel resistance measurement mode setting or querying command e CpQ Parallel capacitance and quality factor measurement mode setting or querying command e CpD Parallel capacitance and dissipation factor measurement mode setting or querying command 18 CsRs Serial capacitance and serial resistance measurement mode setting or querying command e CsQ Serial capacitance and quality factor measurement mode setting or querying command e CsD Serial capacitance and dissipation factor measurement mode setting or querying command e LpRp Parallel inductance and parallel resistance measureme
23. rt e Binning Mode The Binning mode is reserved for future use such as GPIB Currently it is set to work the same way as the Normal mode that receives commands from the keypads and sends the results of measurement to both LCD display and a remote PC through the USB port e Remote Binning Mode In the Remote Binning mode the RMT Bin on the LCD will be lit the operation of MT4090 is controlled by a remote USB equipped PC or terminal and the results of the measurement will be simultaneously sent to the local LCD display and remote workstation through the USB port In this mode all functional keypads except button are locked Remote Binning mode is opened for users to design your own private fast and high efficient application programs Users can design a server or driver any software component that can do server s job with Graphic interface OSI network model and powerful interpreter built in it to support Graphic display Network connectivity structure command SCPI IEEE488 etc interpretations and let it be a bridge between a higher level application program such as VB VISUAL EXCEL ACCESS etc and the MT4090 It is described in the following figure Server COM DCOM ATL CONTROL AUTOMATION EXE MORE Built in VB VISUAL lt gt EXCEL ACCESS etc 4090 Graphic interface OSI network model and or powerful Interpreter or Parser The communication protocol between the MT4090 and a remo
24. ry display If the parallel mode Cp is selected only the D and Q can be shown on the secondary display The following shows some examples of capacitance measurement DBBS 010 0063 3594 ae Frequency Hz Test Level VY Frequency Hz Test Level CV E A The testing level and frequency can be selected by pressing the key and key respectively 2 2 Inductance Measurement Press the key to select Ls or Lp mode for measuring the inductance in serial mode or parallel mode If the serial mode Ls is selected the D Q and can be shown on the secondary display If the parallel mode Lp is selected only the D and Q can be shown on the secondary display The following shows some examples of inductance measurement 9 aspi Frequency Hz Tast Level V JOM 0361 Frequency Hz Test Level V The testing level and frequency can be selected by pressing the key and key respectively 14 3 Operation Modes There are four operation modes in the MT4090 They are Normal Binning Remote and Remote Binning modes By pressing the button users can select one of the 4 operation modes above e Normal Mode The Normal mode is the default operation mode when power on It is a local mode that the MT4090 is controlled by the keypads and the results of the measurement will be sent to both LCD display and a remote USB equipped PC through the build in USB po
25. s 4 When measuring L and C multiply Ae by 1 if the Dx 50 1 Aeis applied only when the test level is set to 1Vrms 9 57pF 159 1pF 1 591nF 15 91nF 159 1nF 1 591uF 15 91uF 1591uF 159 1pF 1 591nF 15 91nF 159 1uF 1 591uF 15 91uF 1591uF 15 91mF 0 5 1 0 2 1 0 1961 0 296 1 0 596 1 o 66 31pF 132 6pF 1 326nF 13 26nF 132 6nF 1 326uF 13 26uF 1326uF 120Hz 132 6pF 1 326nF 13 26nF 132 6nF 1 3260 13 26uF 1326uF 13 26mF 0 5 1 0 2 1 0 1 1 0 29 1 0 596 1 e 7 957 15 91pF 159 1pF 1 591nF 15 91nF 159 1nF 1 591uF 159 1uF 15 91pF 159 1pF 1 591nF 15 91nF 159 1nF 1 591uF 159 1uF 1 591mF 0 5 1 0 2 1 0 1 1 0 29 1 0 596 1 e e 0 795 1 591pF 15 91pF 159 1pF 1 591nF 15 91nF 159 1nF 15 91uF 1 591pF 15 91pF 159 1pF 1 591nF 15 91nF 159 1nF 15 91uF 159 1uF lcu 0 5 1 0 2 1 0 19 1 0 2 1 0 595 1 0 159pF 1 591pF 15 91pF 159 1pF 1 591nF 15 91nF 1 591uF 100 2 1 591pF 15 91pF 159 1pF 1 591nF 15 91nF 1 591uF 15 91uF n NA 0 079pF 0 795pF 7 957pF 79 57pF 795 7pF 7 957nF 795 7nF 0 795pF 7 957pF 79 57pF 795 7pF 7 957nF 795 7nF 7 957uF Accuracy 31 83KH 15 91KH 1591H 159 1H 15 91H 1 591H 159
26. s the affecting stray capacitance of switches interconnect cables circuit board foils or other parts could be critical to circuit design or must be repeatable from one unit to another Series Vs Parallel Measurement for Inductors The series mode displays the more accurate measurement in most cases The series equivalent mode is essential for obtaining an accurate Q reading of low Q inductors Where ohmic losses are most significant the series equivalent mode is preferred However there are cases 10 where the parallel equivalent mode may be more appropriate For iron core inductors operating at higher frequencies where hysteresis and eddy currents become significant measurement in the parallel equivalent mode is preferred 1 4 Accessories Operating Manual 1 pc AC Power Cord 1 pc e Kelvin Clip 1 pc e DMM Test Leads 1 pc 11 2 Operation 2 1 Physical Description SU cem ut 23 Primary Parameter Display L C Z DCR Function Key Measurement Frequency Key Measurement Level Key Model Number D Q 0 ESR Function Key 13 15 17 19 21 23 25 Open Calibration Key Relative Key Short Calibration Key Remote Function Key Power Switch AC Power A Terminal T OD UM NM MT 4090 Meter 12 1 l Dg 4 OPEN OON A EVEL 6 40 42 46 22 20 25 26 21 24 Secondary Parameter Display DCA ACA Function Key LCUR Terminal
27. te USB equipped PC is described as follows 1 The commands that will be sent from a remote PC to the MT4090 are used to set up the machine to a selected measurement mode The command syntax is MOD current state code It always starts with MOD follows by a space and then the current state code The current state code that is defined in the table below is bytes 24 bits long bit 23 22 21 bit 0 where bit 23 is the MSB and bit 0 is the LSB 15 bit position DC AC V A Bit 2 Bit 0 test freq 100 Hz 0001 0 2 010 KA on pOKH 0 20 100K Hz Ld 0 WO Reserved 0 0 0 0 111 Reseved somvims or omms 0 0 00 9 hms O 11 41 Reserved Bits Reseed o o Default Default o Normal 94 Calibration Calibration Normal Normal Biti Bit8 Reseved DCR Heserved 111 Reserved 1 I 1 0 mM 10 11 12 Bit 11 Ls Cp Cs Z EG SR Bit 16 Bit 13 000 RH nH 00 0 0 DEG 0 0 0 0 0 0 NN ono om mo RHE tor RHKOm _ tn RHMOm mo 16 1101 ee 1110 MERE 1111 Auto Ranging Auto Ranging Bit 17 o Shor Cal Short Cal 1 Bit 21 Bit 18 Measurement Modes 0000 Heserved 0001 0010 0110 For ex
28. uery the measurement level e LEV PARAMETER 20 oet the measurement level according to the parameter When setting is done the 4090 will return string PARAMETER ASCII string Numerical code 1VDC 0 1Vrms 1 250mVrms 2 50mVrms 3 Example LEV 1V OK e LEV Return the current measurement level setting Example ASC ON OK LEV 1Vrms return value ASC OFF OK LEV 1 return value MODE Query the measurement mode If in LCR measurement mode five fields will be returned 1 Frequency 2 Level 3 Measurement mode 4 Unit of primary display 5 Unit of secondary display The existence of field 5 depends on the measurement mode For example there s no field 5 if the measurement mode is DCR or CPD The separation between fields is space ASCII 20H Example ASC ON OK CPD OK MODE 1KHz 1Vrms CpD uF return value ASC ON OK CPRP OK MODE 1KHz 1Vrms CpRp uF Ohm return value If in Voltage measurement mode three fields will be returned 1 Measurement mode 2 Unit of primary display 21 ASC DCV OK MODE DCV V return value RANG mV OK MODE DCV mV return value RANG PARAMETER Set query the measurement unit e RANG PARAMETER Set the measurement unit according to the parameter OK string will be returned when setting is complete PARAMETER ASCII string Numerical code pF 0 nF 1 uF 2 mF 3 F 4 nH 8 uH 9 mH 10 H 11 KH 12
29. uracy table get Lae 0 5 ESR Accuracy lt 100 2 f Cx ESR ESRae Ae of ESR f Test Frequency Hz Xx Measured Reactance Value Lx Measured Inductance Value H Cx Measured Capacitance Value F Accuracy applies when Dx measured D value lt 0 1 Example Test Condition Frequency 1KHz Level 1Vrms DUT 100nF Then Z 22908 fF 1 2 2 10 100 10 Refer to the accuracy table get Crc 0 1 ESR E 1 500 E 100 D Accuracy D accuracy could be obtained as the following example Dae Ae of D measurement value Accuracy applies when Dx measured D value x 0 1 When Dx 0 1 multiply Dx by 1 Dx Example Test Condition Frequency 1KHz Level 1Vrms DUT 100nF Then 2 1 wx 1 2 107 100 10 Refer to the D accuracy table get D 4 0 002 Q Accuracy 2 Q Ox De Ae 1 Ox De Qae Ae of Q measurement value Qx Measured Quality Factor Value De Relative D Accuracy Accuracy applies when De lt Example Test Condition Frequency 1KHz Level 1Vrms DUT 1mH Then IZx 2 z 10 107 62830 Refer to and D accuracy tables get 0 59 0 005 If measured 20 Then Qx De Ae 1 Qx De 2 10 1 accuracy could be obtained as the following exa
30. xis This impedance measurement plane can also be seen as the polar coordinates The Z is the magnitude and 0 is the phase of the impedance Imaginary Axis X s ev 2 5 5 Heal Axis Rs Figure 1 1 Z R jXs lZ Z0 Q R Z Cos 0 X X Z 0 0 S Z Impedance Hs Resistance Xs Reactance Q Ohm There are two different types of reactance Inductive X_ and Capacitive Xc It can be defined as follows X 2zfL L Inductance C Capacitance OC DAC f Frequency Hz Also there are Quality factor Q and the Dissipation factor D that need to be discussed For component the Quality factor serves as a measurement of the reactance purity In the real world there is always 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 id D IX OLs 1 Re Ry OCR B OL There are two types of the circuit mode the series mode and the parallel mode See Figure 1 2 to find out the relationship of the series and parallel modes Real and imaginary components are serial Real and imaginary components are parallel jX G 1 Rp Z R jX m
31. z 0 050 0 020 100KHz NA 0 050 0 020 0 010 0 004 0 010 0 020 0 050 200KHz 20M 10 1 100K 10K 1K 100 111 0 1 10M 1M 100K 10K 1K 100 1 046 40 523 0 261 0 105 1 0 105 0 105 0 261 0 523 100KHz NA 2 615 1 046 0 409 0 209 0 409 1 046 2 615 200KHz 2 Accuracy As shown in 7 accuracy table C Accuracy As shown in C accuracy table or could be calculated as the following example 1 Zq 2 m f Cx Cae Ae of C f Test Frequency Hz Cx Measured Capacitance Value F IZx Measured Impedance Value Accuracy applies when Dx measured D value lt 0 1 When Dx gt 0 1 multiply Cae by y1 Dx Example Test Condition Frequency 1KHz Level 1Vrms DUT 100nF Then 1 1 215900 2 7 103 100 1077 Refer to Z accuracy table get lt 0 190 L Accuracy As shown in L accuracy table or could be calculated as the following example 2 Lae of L f Test Frequency Hz Lx Measured Inductance Value H IZx Measured Impedance Value Accuracy applies when Dx measured D value lt 0 1 When gt 0 1 multiply Lae by V1 Dx Example Test Condition Frequency 1KHz Level 1Vrms DUT 1mH Then IZx 2 2 7 10 107 6 2830 Refer to the Z acc
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