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MicroOhm 10A

MI 3250

Instruction manual

Version 1.1.2, Code no 20 751 893

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Summary of Contents for MI 3250

Page 1: ...MicroOhm 10A MI 3250 Instruction manual Version 1 1 2 Code no 20 751 893...

Page 2: ...rel metrel si Mark on your equipment certifies that this equipment meets the requirements of the EU European Union concerning safety and electromagnetic compatibility regulations 2011 METREL No part o...

Page 3: ...2 Measurement control window 17 3 4 3 Message window 17 3 4 4 Battery and time indication 18 3 4 5 Backlight operation 18 4 Main menu 19 4 1 Instrument Main menu 19 4 2 Memory Menu 20 4 2 1 Saving res...

Page 4: ...MI 3250 MicroOhm 10A Table of contents 4 7 2 Periodic calibration 35 7 3 Service 35 8 Technical specifications 36 8 1 Resistance measurement 36 8 2 Measurement parameters 36 8 3 General data 37...

Page 5: ...MicroOhm 10A meter Resistance measurement Four wire Kelvin method High Resolution measurement 24 Bit ADC Auto or Manual Range Wide measuring range 0 1 2 k Adjustable test current 1 mA 10 A Temperatur...

Page 6: ...ck while dealing with hazardous voltages Do not use the instrument in supply systems with voltages higher than 300 V Service intervention or adjustment is only allowed to be carried out by competent a...

Page 7: ...ect automatic discharge may not be done immediately High voltage can appear on test terminals when measuring inductive object Do not connect test terminals to external voltage higher than 300 V AC or...

Page 8: ...he instrument automatically recognizes the connected power supply and begins charging Symbols Indication of battery charging Figure 2 3 Charging indication When connected to an installation the instru...

Page 9: ...to restore the batteries to their normal capacity Notes The charger in the instrument is a pack cell charger This means that the battery cells are connected in series during the charging The battery c...

Page 10: ...atory use Part 1 General requirements EN 61010 031 Safety requirements for hand held probe assemblies for electrical measurement and test Note Immunity to radiated RF fields Field strength 10V m Modul...

Page 11: ...ent power on or off The instrument automatically turns off 15 minutes after the last key was pressed 3 MEM Store recall clear tests in memory of instrument 4 SELECT To enter set up mode for the select...

Page 12: ...ion of mains supply cable Figure 3 3 Communication terminals USB and RS232 Figure 3 3 Battery cover Figure 3 4 3 2 1 Test leads connector Figure 3 2 Test leads connector Legend 1 C1 Current terminals...

Page 13: ...Legend 1 RS232 connector Communication with PC RS232 port Communication with printer 2 USB connector Communication with PC USB 1 1 port 3 Mains connector Mains supply of the instrument and battery ch...

Page 14: ...ct inserted batteries Warnings When connected to an installation the instruments battery compartment can contain hazardous voltage inside Disconnect all test leads remove the power supply cable and sw...

Page 15: ...home page http www metrel si Figure 3 6 Standard set of the instrument Instrument MI 3250 MicroOhm 10A Current test leads with crocodile clip 2 5 m 2 5 mm2 2 pcs Kelvin Current test leads 2 5 m 2 5 mm...

Page 16: ...asurement campaign this result is refreshed every few seconds After finishing measurement result is hold on screen until new measurement is started R shows resistance in the negative direction During...

Page 17: ...It is possible to select one of following ranges 2 m 20 m 200 m 2 20 200 2 k Current allows user to select proper current for resistance measurement It is possible to select one of following currents...

Page 18: ...4 4 Battery and time indication The indication indicates the charge condition of battery and charger connection Battery capacity indication Low battery Battery is too weak to guarantee correct result...

Page 19: ...available Measurement Memory Menu Settings Menu and Help Menu Figure 4 1 Instrument Main menu Keys Select one of the following menu items Measurement See chapter 5 2 Memory Menu Memory management see...

Page 20: ...re 4 2 Memory Menu 4 2 1 Saving results After the completion of a test the results and parameters are ready for storing By pressing the MEM key the user can enter storing menu Figure 4 3 Storing Menu...

Page 21: ...call Menu Figure 4 5 Recalled result screen Keys in Recall menu Selects one of the following items Object No of results Decrees or increase the parameter SELECT Recalls result in selected location ESC...

Page 22: ...Object No of results Decrees or increase the parameter SELECT Enters Delete confirmation screen ESC Returns to the Memory Menu Keys in Delete confirmation screen SELECT Deletes result s in selected l...

Page 23: ...settings Temperature Compensation temperature compensation settings Set Limits limit values selection Instrument Info basic instrument information SELECT Confirms selection ESC Returns to the Main me...

Page 24: ...nu ESC Returns to the Settings menu without changes Warning If the batteries are removed of the instrument the time and date will be lost 4 3 4 Set Contrast In this menu the contrast of the display ca...

Page 25: ...the parameter SELECT Enters Coefficient menu ESC Returns to the Settings menu changes are stored automatically Keys in Coefficient menu Select the parameter to be changed Decrees or increase the para...

Page 26: ...hows the compensated value Figure 4 13 Compensated result example This table shows the temperature coefficient of various materials at 20 C 68 F Material Symbol Temperature coefficient C ppm Resistivi...

Page 27: ...it is within the given limits Figure 4 14 Setup limits menu Keys Select the parameter to be changed Decrees or increase the parameter ESC Returns to the Settings menu changes are stored automatically...

Page 28: ...The Help menu contains schematic diagrams for illustrating how to properly connect the instrument to the various test objects Keys in help menu Selects next previous help screen ESC Returns to the Set...

Page 29: ...outside the P1 and P2 probes The Voltage drop across the Rx is measured across P1 and P2 and these should be placed exactly at the points to be measured Note about poor connection Most measurement err...

Page 30: ...to Range Off On Range 2 m 20 m 200 m 2 20 200 2 k Current 10 A 1 A 100 mA 10 mA 1 mA Test circuits for Resistance measurement Figure 5 3 Measurement of Resistance Resistance measurement procedure Sele...

Page 31: ...ined Single measurement I t plot t I I I ADC ADC t u t Test Start Figure 5 5 Single Mode Note The Single Mode can be primarily used for measuring Ralays Switches Connectors Bus bars Power distribution...

Page 32: ...EMF elimination and started a single measurement every time the P1 P2 C1 and C2 are connected to the test object The main result displayed on the display is an average of the last bidirectional measur...

Page 33: ...r testing purpose can flow this energy requirement must be met 2 2 1 I L W The range and current output is user defined Inductive measurement I t plot t I ADC t u t Test I Start Stop tc td Figure 5 8...

Page 34: ...n the instrument USB or RS 232 How to transfer stored data RS 232 communication connect a PC COM port to the instrument RS 232 terminal using the RS 232 serial communication cable USB communication co...

Page 35: ...nt use a soft cloth slightly moistened with soapy water or alcohol Then leave the instrument to dry totally before use Warnings Do not use liquids based on petrol or hydrocarbons Do not spill cleaning...

Page 36: ...mode Test method 4 wire measurement Note All data regarding accuracy is given for nominal reference environment condition and forward and reverse measurements Inductive mode will introduce an undefine...

Page 37: ...al warnings yes Display 320 x 240 dots matrix display with backlight Reference conditions Reference temperature range 25 C 5 C Reference humidity range 40 RH 70 RH Operation conditions Working tempera...

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