TEST Start/Stop
Contents
1. Aioweaw ul UOLJELUIOJUI 84 eu EE ETTE SI 34 si deay yJuawnasu ayy a ie pajoajos ay asn 1591 241 440 40 NO 1531 94 YMS ee yk cl 0351035 aBues y 1541 39NVA TIONIS 991 ssaidag AINO 3417 40 aN3 S LIA3SHIV34 SVH AYSLLVE TWNYSLNI AHL NSHM paau jou saop y pue umo TVN sy sey 1961849 jeU19JUI 241 10 1 jaued 3U044 5 1 ASL 0 aq 03 d 10 Oy a eyyon spaau layeq 941 NET 3LVY3dO OL YJ9YVH9 AMSALLVE LOANNOOSIG SNIDYVHO STIHM 0379VSIG SI LNSINNYLSNI SHL CONNECTION METHOD 4 WIRE TEST c1 P2 C2 For measuring low to very low resistance eg contact resistance this is the preferred measuring method because the resistance of the test leads does not have an effect negligeable on the measuring results Re is the Resistance of the Current Lead going to C1 Rea is the Resistance of the Current Lead going to C2 R is the Resistance of the Current Lead going to P1 R is the Resistance of the Current Lead going to P2 The input impedance between P1 amp P2 is 10M ohms so because the current being drawn by these pins is so small the voltage loss on R R is very small too So the loss in these potential wires does not2. AjuoJSNU sasny 991 Pall Sey ay JUANI 5 fesny 5 3614 spea Buoj IUBJSISII MO 104 SI 5191 S UIPLAU y pappe spea 159 y JO 51522 ay 1z ayy 5 5 822 Yy pappe si 3nq Zd pue 5906 jualina ou si y y yoaye jou saop y LE ayy 5906 juana ou se ajqeabijGeu pue ty sBulpea ay yoaye y Vy poyzau Ly 243 Buisn pee juan Jo aouejsisoy pee Jo souejsisoy Ld pee enuajog Jo souejsisoy pee juaJino jo ague sisoy yBIy OOL S abeyjoA PNI 243 JUALINI y Ul 3JUBJSISA1 991 yey 037 SIUL 440 221n08 juauing juejsuo9 5 paddojs aq 152 ay u q sey JUALINI ay JONVM ITON9S Buissaidap yey sayeoipul 037 SIUL ajiym ul SI HUSA JI 9850 s aq METE SETETE TEM gt Pepa a esa leen ONS 51 NO JUAUNASUI ay IM 998 uey ssa 104 YOUMS NO own 3x9U 241 1591 Allesyewojne si Aejdsip y paddojs s 1531
3. influence the voltage measured on P1 P2 The tester has a constant current source the current flowing between C1 to C2 is stable and constant Provided the resistance of the current leads are reasonably low low enough for the current regulation to regulate properly this method will give the best results compared to the following 2 methods CONNECTION 3 WIRE TEST C1 Pi P2 C2 For measuring low resistance this measuring method can be utilized C1 and P1 terminals are shorted at the tester Rea is the Resistance of the Current Lead going to C2 R is the Resistance of the Current Lead going to P1 R is the Resistance of the Current Lead going to P2 In this case R is not negligeable anymore because the current going into this lead is the constant current which is high So the error of R exist and in reality this error is added to Rx So if the resistance under test is much higher than the test lead than this method could be accepted This method is a simplified method of measurement Always keep in mind that RP1L is your error resistance CONNECTION METHOD 2 WIRE TEST C1 tP1 P2 C2 For measuring resistance this method can be utilized ie C1 and P1 terminals are shorted P2 and C2 are shorted at the tester R is the Resistance of the Current Lead going to P1 R is the Resistance of the Current Lead going to P2 In this case R and R are not negligeable anymore because the curren
4. it mean that the voltage measured on the resistance is too high and therefore over range Lowering the current by selecting a higher resistance range can solve the over voltage on R The resistance can only be measured precisely when the R and R LEDs are not lit If any of these LEDs lights up then the measurement will be inaccurate 5 The l LED indicates the Constant Current Source is OFF When this LED lights up it means that the current injection has been switched OFF eg could be over temperature The meter has built in custom 3 digit liquid crystal display which can be viewed in most lighting conditions This display indicates the conditions Hold m buzzer polarity condition of load or automatic decimal point change with range selection The ranges are selected by the SCROLL RANGE push button A test is initiated by pressing the TEST STOP push button The instrument takes measurements for 10 seconds if the TEST STOP push button is depressed for less than 3 seconds EnerSave mode If the TEST STOP push button is depressed for more than 3 seconds the test will carry on for 60 seconds The tester switches OFF completely when the OFF push button is pressed but the meter has also an auto off feature The tester Hold the last reading before stopping the test The tester is fuse protected and has a crowbar between and This crowbar is activated by voltage If the voltage is too
5. 20 00m in steps of 0 00001 0 to 200 0m in steps of 0 0001 0 2000m in steps of 0 001 0 to 20 00 insteps of 0 01 0 to 200 0 instepsof 0 1 Accuracy 0 to 2 000 gt 5 offull scale 5 digits 0 to 20 00m gt 4 of full scale 4 digits 0 to 200 0m gt 4 of full scale 4 digits 0 to 2000m gt 3 of full scale 4 digits 0 to 20 00 gt 2 of full scale 4 digits 0 to 200 0 gt 2 of full scale 4 digits Test Current 1A 3 100mA 2 10mA 1 5 Maximum Output Voltage 10V rms Response Time 1secs nominal Voltage Withstand 6V AC between any two terminals Battery Low Indication point 10V nominal MECHANICAL Size 330 x 260 x 160 mm Material Polycarbonate ABS Weight less carrying case xxxxxx g with battery Display Custom Liquid Crystal ENVIRONMENTAL Operating temperature Range 15 C to 55 C Storage Temperature 20 C to 70 C General Safety Battery 12 V rechargeable 12V 2 3AH Fuses 1 x 50mA Potential Fuse 1 x 2A Current Fuse Slow Blow 250V type SPARES AND ACCESSORIES Test Leads Kit 4 FTK4 Test Leads Kit 5 FTK5 Fuses 50mA 2A Battery 12V Rechargeable Instruction Manual CLEANING Clean the instrument case with an anti static cleaner and wipe with dry cloth LLI O E O 2 X E uy LLI A MOIS VZ 39 YUQS y 5 y jo adA y Ag pavejda1 aq
6. 99m and will display it as milli ohms The resistance which can be measured using this scale range is from 00 00m to 19 99m Ohm 8 Range Indication by LED Test Current 1A Resistance 0 200 0 When this LED lights up the instrument will measure up to 199 9m and will display it as milli ohms The resistance which can be measured using this scale range is from 000 0m to 199 9m Ohm Range Indication by LED Test Current 100mA Resistance 0 2000m When this LED lights up the instrument will measure up to 1999m and will display it as milli ohms The resistance which can be measured using this scale range is from 0000m to 1999m Ohm Range Indication by LED Test Current 100mA Resistance 0 20 00 When this LED lights up the instrument will measure up to 19 99 and will display it as ohms The resistance which can be measured using this scale range is from 00 00 to 19 99 Ohm Range Indication by LED Test Current 10mA Resistance 0 200 0 When this LED lights up the instrument will measure up to 199 9 and will display it as ohms The resistance which can be measured using this scale range is from 000 0 to 199 9 Ohm Main Status Indicators Constant Current Source Indicator When this LED lights up the Constant Current Source is shut down The Constant Current Source is shut down when the test is not in progress While in progress the Constant current Source LED does not light up After Switching th
7. DIGITAL LOW RESISTANCE OHM and CONTACT METER DIGITAL LOW RESISTANCE OHM and CONTACT METER MICROPROCESSOR CONTROLLED CHARGER CROWBAR FUSES MEASUREMENT CONNECTIONS PA P2 9 MANUAL RANGING INSTRUCTION MANUAL Description SAFETY RULES SAFETY CHECK DON T TOUCH GENERAL DESCRIPTION OPERATING INSTRUCTIONS DISPLAY SPECIFICATIONS CLEANING INSIDE LID INSTRUCTIONS LABEL CONNECTION METHOD 4 WIRE TEST CONNECTION METHOD 3 WIRE TEST CONNECTION METHOD 2 WIRE TEST TYPICAL APPLICATIONS WORKING PRINCIPLE OF THE INSTRUMENT SAFETY RULES CAUTION AN RISK OF ELECTRIC SHOCK This tester has been designed with your safety in mind However no design can completely protect against incorrect use Electrical circuits can be dangerous and or lethal when lack of caution or poor safety practices are used Do not carry out field measurements on either the power system grounding or anything connected to it without ensuring the contact or circuit under test is fully isolated Take all the necessary precautions Do not exceed the limits of this instrument The circuit to be tested must be de energised and isolated before connections are made to it Do not use test leads probes or crocodiles aligators clips that are dirty damaged or have broken or cracked insulation Such accessories should be removed and repaired Immediately Always disconnect the test le
8. ULD ONLY BE USED BYA COMPETENT SUITABLY TRAINED PERSON REMEMBER SAFETY IS NO ACCIDENT CAUTION RISK OF ELECTRIC SHOCK CAUTION READ THE MANUAL GENERAL DESCRIPTION The Digital Low Resistance Ohm and Contact Meter is a battery rechargeable operated instrument which supplies a constant current to the circuit under test with which is stable for accurate measurements of very low resistance down a micro ohm over a wide range of values Resolution on the lowest range is 1uohm and on the highest range 100 milli ohm The meter has 6 measuring ranges from 2000 micro ohm to 200 0 ohms Measurements are displayed on a large 37 digit custom liquid crystal display This instrument is powered from it s internal rechargeable battery lt has a regulated DC constant current source with current of 10mA 100mA and 1A When recharging the battery the instrument is disconnected from the battery Measurements can only be made while not charging The instrument supplies the current to the resistance being measured through the C and C terminals C being C being The voltage drop across the resistance under test is measured by the potential terminals P and P P being P being Should the current regulation fall out the R LED will indicate that the resistance in the current circuit is too high Lowering the current by selecting a higher resistance range can solve the regulation Should the R LED light up
9. ads before replacing any fuse Always replace the fuse with the type specified and ensure that they are correctly fitted Double check your settings and leads connections before measuring Make a sketch to ensure proper operation and the principle of measurement is correct and well understood Do not touch any exposed wiring connections or other live parts of an electrical circuit If in doubt check the circuit for no voltage first before testing it Disconnect the tester from any external circuit when charging the battery CAUTION AN READ THE MANUAL Follow the instructions in the Manual for every measurement Read and understand the general instructions before attempting to use this tester 3 SAFETY CHECK Before using the tester check the condition of the battery This is done by switching the tester ON If the BAT LOW symbol appears the battery needs charging When charging the battery changing a fuse or removing the cover to access the internal circuitry always disconnect the test leads When replacing the fuse use only the type specified and insert correctly in the fuse holder Double check the settings and lead connections before making measurements DON T TOUCH Don t touch exposed wiring connections or other Live parts of an electrical circuit If in doubt check the circuit first for voltage before touching or connecting to it Do not use cracked of broken test leads THIS INSTRUMENT SHO
10. e Instrument ON the lcs OFF led will lights up When a test has stopped the lecs OFF LED lights up In case of Over Temperature the lcs OFF led will lights up The R indicator LED lights up when the resistance between the current terminals is too high for the constant current source to regulate This indicator is only significant while the test is in progress You can try to lower the test curent if it comes on while testing The R indicator LED lights up when the potential between the potential terminals is too high This also can be due to the resistance under test being too high for that current range Try to lower the current or increase the resistance range only significant while the test is progress 10 DISPLAY The HOLD Sign indicator comes on when the readings are held This happen At switch ON as no reading has been done yet so the display is on Hold with whatever value when TEST stops When Scroll Range is depressed while a test is in progress The Sound Sign indicator is shown while the buzzer is working That means that when the Buzzer sounds the sign is ON The Low Battery Sign indicator is showing when the battery need charging The negative sign is shown when the test leads are reversed This instrument is calibrated while the Test leads are in the correct polarity 11 SPECIFICATIONS ELECTRICAL Resistance Ranges Range 0 to 2 000m in steps of 0 000001 0 to
11. high that crowbar will blow the C fuse automatically to interrupt the circuit The voltage between P and P is also protected for over voltage If that voltage is too high the crowbar will blow the P fuse automatically to interrupt the circuit The tester has a temperature shut down The temperature sensing is done on the current regulation transistor Should this over temperature alarm be activated the I OFF LED will light indicating the current has been shut down Allow the instrument to cool down for a while before proceeding further OPERATING INSTRUCTIONS The connector for the Battery charger can accept AC DC signals up to a maximum of 22Vdc There is a full bridge rectifier inside the tester as well as a regulated battery charger The battery is charged to 13 8V We recommend the use of the power supply step down transformer which is supplied with this tester The light on the power supply transformer lights up when the battery charger is working Depressing the ON key will switch the tester ON At switch ON the tester retrieves the last settings utilized These are the current range settings which were last utilized by the Instrument At Switch ON the buzzer sounds to confirm the ON status Depressing the OFF key will switch the instrument OFF This OFF switch is software operated At switch OFF the buzzer will sound to confirm the OFF condition is processed by the micro Ne
12. is instrument Our obligation under this warranty is limited to repairing replacing or making refund of this test eguipment which proves to be defective within forty eight months from the date of original purchase This warranty does not apply to any of our products which have been repaired or altered by unauthorized persons in any way so as in our sole judgement to injure their stability or reliability or which have been subject to misuse abuse misapplication negligence or accident or which have had the serial numbers altered defaced or removed Accessories not of our manufacture used with this product are not covered by this warranty All warranties implied by law are hereby limited to a period of forty eight months and the provisions of the warranty are expressly in lieu of any other warranties expressed or implied The purchaser agrees to assume all liability for any damages or bodily injury which may result from the use or misuse of the product by the purchaser or it s user his employees or others and the remedies provided for in this warranty are expressly in lieu of any other liability we may have including incidental or consequential damages We reserve the right to discontinue models at any time or change specification price or design without notice and without incurring any obligation 24
13. t going into these leads is the constant current which is high So an error with R exists and this lead resistance error is added to Rx So if the resistance under test is much higher than the test leads then this method could be acceptable This method is a simplified version of measurement Always keep in mind that the lead resistances R and are error measurements This is not an accurate method and is not recommended unless the resistance is above 10 ohms TYPICAL APPLICATIONS Measuring the contact resistance of circuit breakers Measuring the bonding of welding points Measuring the contact resistance of bolted conductors Measuring the copper resistance fo transformers Measuring the earthing conductor resistance Measuring the earth mat connections resistances WORKING PRINCIPLE OF THE INSTRUMENT CHARGING THE BATTERY FUSE REPLACEMENT REPLACING THE POTENTIAL FUSE REPLACING THE CURRENT FUSE NOTES 23 LIMITED WARRANTY We warrant the product manufactured by us to be free from defective material or factory workmanship and agree to repair or replace this product which under normal use and service disclose the defect to be the fault of our manufacturing with no charge for parts and service If we are unable to repair or replace this product we will make a full refund of the purchase price Consult the user s manual for proper instruction regarding use of th
14. xt the tester will be switched OFF completely Depressing the SCROLL RANGE key will stop the test The test is in progress then the scroll will change to the higher ohms range Depressing the key again will move the setting to the next range Each range will indicate its corres ponding LED 7 Provided the TESTER is ON when the TEST Start Stop is depressed the selected TEST will start if stopped or stop if in progress The TEST Start Stop also has the EnerSave features What that means is that if you depress the TEST Start Stop key for more than 3 second while starting the test then the test will be carried up to a duration of 1 minute long Test If you depress the TEST Start Stop Key for less than 3 second or just depress it than the instrument will enter the EnerSave mode and the test duration is limited to about 10 seconds In both cases the Test is stopped automatically by the instrument but the user can always override the auto stop by depressing the TEST Start Stop key at any time in any mode Range Indication by LED Test Current 1A Resistance 0 2 000m 2000u When this LED lights up the instrument will measure up to 1999u and will display it as milli ohms The resistance which can be measured using this scale range is from 0 000m to 1 999m Ohm Range Indication by LED Test Current 1A Resistance 0 20 00m When this LED lights up the instrument will measure up to 19
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