Manual - UEi Automotive
Contents
1. Press the ACM6000 ZERO button The display should read approxiametly 00 0 O ua A N N 7 Using CAUTION to avoid moving belts etc place the jaws of the ACM6000 around the alternator output wire Be sure that the jaws are closed 8 Compare reading with manufacturers specifications 9 When testing is completed move the instrument power switch to OFF and remove the meter from the wire Measuring amp output is only a partial indicator of alternator function and ability to keep the battery charged Performing a Regulator Operating Voltage test is also recommended Blower motor current draw Modern automotive heating and air conditioning systems can be quite complicated Diagnosing these systems may require the use of a service manual to help isolate the exact problem However it is often possible to make quick work of pin pointing some problems by using the ACM6000 to measure current flow Blown A C fuses or insufficient cooling heating caused by a faulty blower motor are easy to find using the ACM6000 Test procedure 1 To test the blower motor disconnect the vehicles electrical harness from the blower motor 2 Connect a fused jumper lead set from the battery to the blower motor 3 Turn the ACM6000 rotary function switch to 200A 4 Slide the instrument power switch to ON 5 Press the ACM6000 ZERO button The display should read approximately 00 0 6 Place the jaws of the ACM6000 around one of the two wir2. The same precautions apply Measuring temperature ml Slide the ACM6000 power switch to the ON position 2 Turn the rotary function switch to F 3 Connect the banana plugs of the thermocouple adapter into the meter inputs Fig 1 Observe polarity 4 Connect the K type thermocouple to the thermocouple adapter O1 The temperature reading can be read on the display panel 6 When testing is comple move the instrument power switch to OFF Plug the standard K typ ATAI Tem thermocouple into this Probe Ada side of the adapter p Fig 1 ACM6000 MAN DC current testing When investigating electrical circuit problems the tools most often used by the automotive technician are the trouble light and the volt ohm meter or DMM The trouble light is often the tool used to test for current However most trouble lights have severe limitations 1 The operator must guess at the amp draw based upon the brightness of the bulb Modern automotive circuits require precise current loads Accurate current measurements are crucial 2 Many trouble lights require up to 2 amps to shine brightly If used to test a circuit designed for less amperage the 2 amp draw can over load the circuit resulting in damage 3 Some DMMs have a built in current testing feature When using most DMM s to measure amps it is necessary to open the system under test and connect the DMM in series While the test result is accurate the hoo
3. Hand strap A Hand Strap is provided to avoid accidentally dropping the ACM6000 Clamp Meter Pouch A pouch is provided for storage of the ACM6000 Clamp Meter the accessories and the operator s manual Operating Instructions AC DC current testing The procedure for measuring current using the ACM6000 Is different from measuring voltage e To measure VOLTAGE the meter leads are connected to the points in the circuit being tested e To measure CURRENT the jaws of the Clamp Meter are placed around a wire or cable to make the measurement Ensure test leads are not connected to the meter 1 To measure high AC CURRENT Turn the rotary function switch to the 200 Amps AC setting 200A To measure high DC CURRENT Turn the rotary function switch to the 200 Amps DC setting 200A 2 Slide the ACM6000 power switch to the ON position 3 Press the ZERO button DC current measurements only This will zero the instrument for the most accurate reading 4 Place the jaws of the ACM6000 around the conductor being tested e Verify that the instrument and its strap do not touch moving pulleys or belts e Failure to obey the current flow polarity indicator arrow located on the inner jaw face will result in a minus sign to the left of the amps readout e Be sure the jaws are closed leaving no air gap between the two jaws A Remove the instrument from the conductor B Turn the rotary switch to the 20A scale C Follow steps 3 and
4. INSTRUCTION MANUAL M6000 A 440 HIMOd NO 440 Our 0009N9V LE JSJ94W due 9 dwy mo7 2 1 800 547 5740 Fax 503 643 6322 www ueiautomotive com email info ueitest com Low Amp Clamp On DMM Introduction The ACM6000 DC AC Clamp Meter instrument allows pocket sized convenience for testing voltage current flow resistance continuity and temperature A voltage measurement does not always provide complete information about the behavior of a circuit A current measurement in addition to the voltage measurement provides additional information to help you make a correct diagnosis The instructions recommendations and illustrations in this manual are intended the basic information necessary to get you started on the path to automotive electrical diagnostics State of the art electronic test tools are not very effective without under standing basic automotive electrical diagnostics and basic electrical cir cuits Training courses are usually available from local schools For additional information on domestic field training contact the UEI Automotive Field Training Center at 770 476 1431 8 5 PM EST Custom contract training can be provided in your area Safety Notes Before using this meter read all safety information carefully In this manual the word WARNING is used to indicate conditions or actions that may pose physical hazards to the user The word CAUTION is used to ind
5. Bulbs become dim motors can slow down and relays will often malfunction e When voltage is too high devices are overpowered and bulbs will burn out prematurely motors can run too fast and fail early relays with fine wiring may overheat and fail Use the DMM DC Voltage Testing capability of the ACM6000 to make these important voltage tests NOTE Modern automotive engine management systems utilize computers and pulsed electronic solenoids in order to achieve the best combination of power fuel efficiency and low emissions Those pulsed devices are often on for only a few thousandths of a second at a time In some situations the on pulse lasts only a few millionth of a second The tool of choice to test pulsed circuits is a high performance Labscope like the ADL7000 or ADL7100 These Labscopes sample the circuit millions of times per second Battery state of charge When conducting starting and charging system tests the first step is to verify that the battery is fully charged 1 Place the vehicle ignition switch in the OFF position 2 Turn the headlights ON for 30 seconds to dissipate the battery surface charge 3 Slide the ACM6000 power switch to the ON position 4 Turn the ACM6000 rotary function switch to 5 Connect the test leads to the meter Fig 2 A Connect the black COM lead probe tip to the battery negative post B Connect the red VW F lead probe tip to the battery positive post e A fully charged
6. connection displayed on the left side of the voltage readout NOTE If the voltage reading is not stable further evaluation of the circuit using a labscope model ADL7000 or ADL7100 is recommended 6 When testing is completed move the instrument power switch to OFF Resistance measurement e The ACM6000 supplies a small current to the circuit under test which is used to determine the circuit s resistance e Displays circuit resistance in Ohms W P 3 AN wanne The circuit being tested must be turned OFF NO VOLTAGE PRESENT Use the built in DMM to verify that the circuit under test is turned OFF and no voltage is present Measuring resistance Ohms 1 Slide the ACM6000 power switch to the ON position 2 Turn the rotary function switch to 0 3 Connect the test leads to the meter A Plug the black lead into the COM input B Plug the red lead into the VOF input 4 Verify that the circuit under test has no voltage applied 5 Connect the test leads across the load or circuit to be tested 6 Read the circuit resistance displayed in Ohms 7 When testing is completed move the instrument power switch to OFF Testing continuity Continuity is the measure of a circuit s ability to conduct current as opposed to resisting current flow e The Audible Continuity buzzer will sound when resistance Is under approximately 250 e To set for continuity follow the same procedures prescribed for measuring resistance
7. 4 5 When testing is completed move the instrument power switch to OFF ACM6000 MAN Measuring AC voltage NOTE Observe safety rules AN wanna e Be certain that wires and leads as well as clothing and hands are clear of moving parts e When checking ABS wheel speed sensors be sure the wheels are free to rotate and will not move the vehicle or cause damage 1 Slide the ACM6000 power switch to the ON position 2 Turn the rotary function switch to V 3 Connect the test leads to the meter A Plug the black lead into the COM input B Plug the red lead into the VO F input 4 Connect the probe tips to the circuit under test For automotive AC voltage measurements using a multimeter not necessary to observe polarity NOTE If the voltage readout is not stable further evaluation of the circuit using a labscope is recommended 5 When testing is completed move the instrument power switch to OFF Measuring DC voltage 1 Slide the ACM6000 power switch to the ON position 2 Turn the rotary function switch to V 3 Connect the test leads to the meter A Plug the black lead into the COM input B Plug the red lead into the VOF input 4 Connect the black COM probe tip to the ground side of the circuit under test 5 Connect the red prove tip to the positive side of the circuit The voltage present in the circuit is shown on the display panel readout e Instrument will indicate the polarity of the red lead
8. being tested to calculate resistance Continuity testing In order to assist the technician who may not be able to see the meter display at the same time he is making test lead connections the instrument sounds a buzzer when measured resistance is approximately 25 Ohms or less which indicates there is continuity and not an open circuit ZERO adjustment DC Current Measurement is most accurate when the instrument is zeroed before making the measurement By pressing the ZERO button for one or two seconds the display reading is reset to approximately 00 0 Note Some flicker of the least significant digit the rightmost digit is normal due to the presence of electrical and magnetic forces present from shop lighting wiring and other live electrical sources near the test area Data hold Press the HOLD button to freeze the display reading e Press the HOLD button again to resume real time readings P 2 Low battery indicator The LOW BATTERY indicator displayed in the upper left hand corner of the display screen alerts the operator to replace the ACM6000 battery e See Battery Replacement for detailed instructions Temperature measurement Automotive repair and maintenance often involves checking the temperature of A C and heating duct air as well as engine coolant temperature The operator may read temperature by connecting any standard K type thermocouple to the input jacks through the supplied temperature probe adapter
9. condensation on the ACM6000 the meter can become dangerous to use and can give erroneous readings Most test equipment in use today use sensitive digital electrical components These components are extremely sensitive to heat and humidity NOTE Whenever the meter undergoes a rapid or extreme change of temperature or humidity it should be left on for about 5 minutes to allow the internal temperature to stabilize This will ensure that your measurements are as accurate as possible P 9 Standard and Optional Accessories Standard Soft carrying case 2 eee eee eee eee ACM6100P Standard test lead ccc cece eee eee ATL55 Temperature probe c cece eee ee anes ATA1 ATH2329 Optional Rigid temperature probes with handles Surface probe 00c cece eee eens ATH2336 Liquid Immersion probe 0 ATH2338 Air Gas probe usas pueda e ne ie pa males ATH2350 Screw on Alligator ends cc eee nnan AAC3 Extended test leads TSC NOAGS sed tte Pesci E EC E eiace ADL7100A107 15 CAOS sis basis is ake eee ADL7100A108 Premium silicon test leads 00000 ATL300 ACM6000 MAN P 10 UE ACM6000 TE ow Amp Clamp On DMM Limited Warranty The ACM6000 Is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase If within the warranty period your instrument should become inoperative from such defects the unit will be rep
10. reading Press the HOLD button again to release the HOLD feature 7 When testing is complete move the instrument power switch to OFF Detailed evaluation of fuel pump performance can be made using the Automotive Labscope Lamps lights and electric motors Devices such as headlamps stop lights and interior lights as well as electric motors wiper seat mirror etc draw current at a steady rate The ACM6000 can be used to verify the current flow powering these devices Measuring current in suspect circuit 1 Turn the ACM6000 rotary function switch to 200A 2 Slide the instrument power switch to ON 3 Press the ACM6000 ZERO button The display should read approximately 00 0 ACM6000 MAN 4 Place the jaws of the ACM6000 around the positive wire of the circuit under test 5 Note the display readout Lights and motors should not draw whole amps of current until switched ON 6 Switch power to the suspect circuit ON and verify that current draw does not exceed normal limits for that circuit 7 When testing is complete move the instrument power switch to OFF and remove the meter from the wire AC voltage testing Some sensors produce their own voltage as an AC output AC devices include The ABS Sensor the Magnetic Crank Sensor Magnetic Distributor Pickup and the Alternator These devices operate at speeds that are too fast for a meter to be able to give exact measurements of each pulse The meter reading is
11. 2 ZERO button In the DC AMP s mode this control zero s the display so the user can get the most accurate DC current reading 3 Test lead input terminals e Positive input red terminal for e Voltage e Temperature e Resistance e Negative input black terminal for used as common ground or low side input for all test lead measurements 4 ON OFF switch Slide the switch forward to turn the instrument on slide it back to turn the instrument off 5 HOLD button Freezes the display Wire to be tested must pass through the opening when clamp jaw is shut Press there to open clamp jaw Display 1 Battery Low Indicator If the letters BAT are displayed turn off the meter and replace the battery 2 Minus Sign Indicates negative polarity 3 Measurement Display This meter can display numbers up to 199 9 on the LCD The units ohms volts etc are displayed as symbols to the right of the digital value NOTE A 1 on the left side of the display indicates that the input has exceeded the selected range Features AC and DC current testing Frayed wiring corroded or degraded connections failing switches etc may test OK for voltage but may not allow sufficient current for the circuit to function properly Technicians can make better informed diagnostic decisions when circuit current amperage is also tested The ACM6000 can be used to test for both AC and DC current The user selectable range switc
12. M6000 power switch OFF 2 Remove test leads from the meter Remove the battery cover screw Fig 4 Remove the battery cover Remove the depleted battery O wo A WGN Insert a fresh 9V NEDA1604 IEC6F22 Battery observe polarity markings in the battery compartment 7 Replace the battery cover 8 Replace and secure the battery cover screw 9 Resume normal use of the instrument Z Battery a Lo JW Battery Compartment Fig 4 ACM6000 MAN Specifications 1 DC current Resistance Accuracy 3 50 26 digits 200A 100mA 3 5 3 digits 2 AC current Accuracy Range Resolution 50 60Hz 60 100Hz 100 400Hz 100 400Hz 3a lodes Od 00A 200mA 3 9 ctAdgts 30 7dgts 30 10dgts 3 10dgts 3 DC Voltage input impedance 10m0 Range Resolution Accuracy 200V 0 1V 1 2 digits 4 AC Voltage Accuracy ce r 5 Temperature K Type thermocouple Range Resolution Accuracy 40 F VF 3 6dgts lt 302 F to 1000 F 3 gt 302 F at 50 90 F ambient Temperature 6 Resistance Resistance Accuracy Continuity Tone Environmental operating conditions This clamp meter was designed to be used in temperature and humidity that remains within the range of 60 to 90 F and 30 to 85 Relative Humidity RH Excessive temperatures hot or cold or excessive humidity can cause the meter to give erroneous readings If the humidity raises to the point of causing
13. ability complaints A typical example of a potentiometer is the Throttle Position Sensor TPS To test a throttle position sensor Test procedure 1 Slide the ACM6000 power switch to the ON position 2 Turn the rotary function switch to 3 Connect the test leads to the meter A Connect the black COM lead probe tip to the battery negative post B Connect the red VW F lead probe tip to the battery positive post 4 Turn the ignition switch on DO NOT start the engine 5 Look for a 5 volt reading Some vehicles may differ Verify the correct reference voltage for the vehicle being tested e Ifthe reference voltage is too high or low look for a problem with the wiring harness connectors or the computer 6 After establishing that the reference voltage is OK connect the red lead probe tip to the TPS output wire 7 Look for low voltage at idle position which should smoothly increase as throttle is increased Any erratic voltage readout indicates a bad sensor Verify the factory specs for the low voltage idle setting As little as one tenth of one volt off can make a difference in vehicle performance The high voltage full throttle voltage should reach at least 80 of the reference voltage For example it should reach at least 4 volts with a 5 volt reference 8 Turn the vehicle switch OFF 9 When testing is complete move the instrument power switch to OFF and disconnect the meter leads ACM6000 MAN Measurin
14. aired or replaced at UEi s option This warranty covers normal use and does not cover damage which occurs in shipment or failure which results from alteration tampering accident misuse abuse neglect or improper maintenance Batteries and consequential damage resulting from failed batteries are not covered by warranty Any implied warranties including but not limited to implied warranties of merchantability and fitness for a particular purpose are limited to the express warranty UEi shall not be liable for loss of use of the instrument or other incidental or consequential damages expenses or economic loss or for any claim or claims for such damage expenses or economic loss A purchase receipt or other proof of original purchase date will be required before warranty repairs will be rendered Instruments out of warra ntywill be repaired when repairable for a service charge Return the unit postage paid and insured to 1 800 547 5740 FAX 503 643 6322 www ueiautomotive com Email info ueitest com This warranty gives you specific legal rights You may also have other rights which vary from State to state PLEASE ao RECYCLE Copyright 2007 UEi Automotive ACM6000 MAN 1 07
15. an averaged measurement When more detailed analysis of an AC device it is necessary use a Labscope Measuring AC Voltage 1 Slide the ACM6000 power switch to ON 2 Turn the rotary function switch to V 3 Connect the test leads to the meter A Plug the black lead into the COM input B Plug the red lead into the VWF input 4 Connect the probe tips to the circuit under test For AC sensor voltage measurements with a multimeter it is not necessary to observe polarity eo e Be certain that wires and leads as well as clothing and hands are clear of moving parts When checking ABS wheel speed sensors be sure the wheels are free to rotate and will not move the vehicle or cause damage 5 When testing is complete move the instrument power switch to OFF Diagnostic tips e Heat and vibration can degrade sensor magnets causing reduced voltage or erratic voltage and current output e Cracked magnets create unstable signals and erratic computer responses Frayed wiring and poor connections frequently cause voltage and current flow problems on AC sensors Check clearance between magnet and pickup against manufacturer s specifications P 6 DC voltage testing Most electric electronic devices in an automobile rely upon Direct Current Voltage will always have a direct relationship to current It is important that the voltage be appropriate for the need e When voltage is too low insufficient power can cause problems
16. battery will read 12 6 volts or more e A reading of 12 4 to 12 5 is considered about 75 charged e If the reading is 12 3 volts or less charge the battery before making further starting and charging system tests 6 When testing is complete move the instrument power switch to OFF and disconnect the test leads ER M cl TOM CATH WF Fig 2 ACM6000 MAN Battery cranking voltage By comparing the Battery Cranking Voltage test result with the Starter Current Draw test result the technician can determine if a battery should be replaced Test procedure 1 Verify that the battery state of charge is ok Disable ignition or fuel so the engine will crank but not run 2 3 Slide the ACM6000 power switch to the ON position 4 Turn the ACM6000 rotary function switch to V 5 Connect the test leads to the meter A Connect the black COM lead probe tip to the battery negative post B Connect the red VW F lead probe tip to the battery positive post eo Observe safety procedures for step 7 Be certain the vehicle can not move during the cranking portion of the test 6 Crank the engine while observing the meter reading To avoid overheating the starter limit cranking to 15 seconds e Look for a reading of 9 6 volts or higher when testing at 70 F e In colder conditions allowing 0 1 volt less for each 10 F drop in temperature is accepted practice 7 When testing is complete move the instrumen
17. es either one will work P 5 7 Most blower motors draws about 25 amps at battery voltage Verify normal current draw specifications for the type of motor you are testing e Excessive amperage indicates a faulty blower motor probably due to an internal short e Insufficient amperage indicates a faulty blower motor probably due to high electrical resistance either internally or in the connector paths 8 When testing is complete move the instrument power switch to OFF and remove the meter from the wire Fuel pump current draw Diagnosing fuel pump problems can sometimes be difficult The ACM6000 can be used to make a quick check for fuel pump current draw during cranking A fuel pump related problem possibly exists if current flow is 2 amps or less during cranking Additional testing may be necessary if current flow is more than 2 amps Test procedure 1 Disable the ignition system This is a cranking test 2 Turn the ACM6000 rotary function switch to 20A 3 Slide the instrument power switch to ON 4 Press the ACM6000 ZERO button The display should read 00 0 5 Place the jaws of the ACM6000 around the power wire to the fuel pump Be sure the jaws are closed AN wannine Observe proper safety procedures for step 6 Be certain the vehicle cannot move during the cranking portion of this test 6 Observe the fuel pump current draw reading while an assistant cranks the engine e Press the ACM6000 HOLD button to freeze the
18. g resistance Resistance measurements are frequently made as a part of automotive circuit and component testing Additionally continuity testing is used to establish that a circuit is complete no opens Continuity testing is a quick verifiction that resistance is below a certain level Levels can vary from meter to meter A buzzer sounds when measured resistance Is below approximately 25 Ohms Ohms and audible continuity measurements ed Slide the ACM6000 power switch to the ON position N Turn the rotary function switch to Q Connect the test leads to the meter A Plug the black lead into the COM input B Plug the red lead into the VOF input sa gt Verify that the circuit under test is completely OFF Connect the test leads across the lead or circuit to be tested PE p Read the circuit resistance displayed in Ohms e If the display shows an over range indication 1 at the left side of the display the circuit resistance is either above the meter s 20000 range or the circuit is open NOTE The audible continuity feature allows the operator to do quick resistance tests without looking at the meter display The audible continuity buzzer will sound if resistance is under approximately 250 N When testing is complete move the instrument power switch to OFF and disconnect the meter leads NOTE Any circuit tested that has a voltage applied will not provide an accurate reading Temperature
19. h allows for measurement up to 200 Amps ACM6000 MAN Clamp on techniques for current testing Traditional current measurement involves opening a suspect circuit and connecting the meter in series However opening a circuit to perform a current flow test creates its own set of problems such as Accessing removing replacing a computer module or other device from a hard to get area e Cutting and then repairing a wire Reprogramming data that was lost when a circuit was opened The ACM6000 Clamp Meter allows the technician to quickly and easily make a non intrusive current flow measurement by clamping the jaw around a wire AC and DC voltage testing Automotive technicians routinely use a DMM to make voltage checks of the battery and various circuits The ACM6000 permits the user to make standard AC DC voltage tests resistance and continuity tests temperature tests and non intrusive current tests while enjoying shirt pocket convenience e Use the DC Voltage Measurement capability V to test any circuit or device that is powered by battery or regulated voltage e Use the AC Voltage Measurement capability V to test any circuit that generates its own voltage such as a magnetic type trigger pickup ABS or crank sensor Resistance measurement Ohms testing The ACM6000 can be used to measure how much electrical resistance Is present in a circuit or across a connector The meter sends a small current through the circuit
20. he jaws of the ACM6000 around the starter cable and be sure the jaws are closed 6 Press the ACM6000 ZERO button The display screen should read approximately 00 0 P 4 AN wannine Observe proper safety procedure for step 7 Be certain the vehicle cannot move during the cranking portion of the test 7 Crank the engine while observing the meter reading AN cauon Avoid overheating the starter limit cranking time to 15 seconds 8 When testing is completed move the instrument power switch to OFF Abnormally high current can indicate e Over advanced engine timing e Seized engine e Faulty starter Abnormally low current can indicate Low compression engine e High resistance in starter circuit or connections e Faulty battery to check the condition of the battery use the voltmeter to perform a cranking voltage test Parasitic load Parasitic Load is the small amount of current drawn from the battery after the ignition switch is turned OFF and the various electronically controlled devices have phased from Awake to Asleep mode Typically the parasitic load will be under 20 milliamps In some applications parasitic load will reach 40 milliamps and still be normal Check the vehicle service manual for exact specifications Test procedure 1 Turn the ignition switch and all accessories OFF 2 Disable the under hood light 3 Allow sufficient time for all the electronic devices to be asleep e Some devices take
21. hours e Refer to the vehicle service manual for exact time 4 Turn the ACM6000 rotary function switch to 20A 5 Slide the instrument power switch to ON 6 Press the ACM6000 ZERO button The display should read approximately 00 0 7 Place the jaws of the ACM6000 around the battery positive cable s or the battery negative cable s Either way will work Be sure the jaws are closed 8 Because the display readout can vary up to 60mA add 60mA to the highest expected reading for parasitic load of the vehicle under test If the display readout exceeds that amount further testing is recommended Example Normal highest parasitic load for vehicle under test is 40mA Add 60mA to the expected 40mA for a total of 100mA If the display is 0 10A 100mA the parasitic load can be considered normal However a reading of 0 11 A 110mA or more would be too high ACM6000 MAN Alternator output Problems involving hard starting because of low battery current can be caused by a faulty alternator The alternator is responsible for keeping the battery charged The ACM6000 provides an easy way to check alter nator current output Test procedure 1 This test should be conducted with the battery fully charged e Charge the battery if necessary Start engine and run at about 1800 RPM Allow sufficient time for all the electronic devices to be asleep Turn the ACM6000 rotary switch to 200A Slide the instrument power switch to ON
22. icate conditions or actions that may damage this instrument A N WARNING Follow appropriate work area safety precautions Automotive safety When performing vehicle maintenance work in a well ventilated area route exhaust gases out of work area Work in a well lit environment Use supplemental work lights in service area DO NOT wear jewelry rings watches etc when working on vehicles e Wear approved safety eyewear at all times e Avoid rotating fan blades drive belts and pulleys on running engines e Beware of electrical shock when working on vehicle wiring and electrical systems Keep open flames and sparks away from batteries engine fuels and oils ACM6000 MAN Even moderate amounts of current can cause ventricular fibrillation e Use insulated tools and gloves to avoid electrical shock e Disconnect wiring from supply voltage before performing continuity tests e Disconnect the negative battery terminal when removing and replacing starters alternators and other components that have direct connections to the battery Multimeter Safety Precautions When making resistance measurements ensure no voltage is present in the component or wire being tested When making voltage or current measurements ensure you don t exceed the maximum rating of the ACM6000 International Symbols N Warning or Caution Double Insulation Protection Class II 1 Rotary Selector Knob Switches measurement function
23. k up is time consuming and often impractical The ACM6000 Clamp Meter is a preferred alternative By simply placing the Clamp Meter around a power or ground wire of the circuit being tested the connection is made No back probing or intrusion of insulation is necessary Additionally the sensitivity and resolution of the ACM6000 gives a precise amperage readout rather than an estimate based upon bulb brightness Because no direct connection is required there is no danger of overloading the circuit Re connecting or reattaching wires is unnecessary NOTE The ACM6000 Clamp Meter is designed to give accurate measurement of continuous current flow If the device being tested is pulsed like solenoids and relays the readout will show the average current For testing recommendations of pulsed circuits contact the UEi Training Coordinator at 770 476 1431 Starter current draw Most starters draw several hundred amps initially to start the crankshaft turning After about one half second the starter current will stabilize for the duration of cranking Typical starter current draw after the initial surge Is e 4 cylinder 120 amps e 6 cylinder 150 amps 8 cylinder 180 amps Test procedure 1 Disable ignition or fuel this is a cranking test Turn the ACM6000 rotary function switch to 200A Slide the instrument power switch to ON gt N N Verify that the vehicle ignition switch is in the OFF position 5 Place t
24. measurement A standard accessory with the ACM6000 is a temperature probe adapter and a K Type thermocouple Use the thermocouple probe tip to contact the component to be measured Additional probes for air fluids and surface contact measurements are available Air conditioning heating duct temperature measurement 1 Insert the thermocouple connector into the adapter Observe polarity 2 Connect the banana plug thermocouple adapter to the ACM6000 black COM and red VOF inputs Fig 3 Observe polarity Turn the rotary function switch to F Slide the instrument power switch to the ON position Position the probe tip in the airflow of an A C heating duct Ho uo A WAN Start the engine and set the vehicle temperature controls for the test Look for the change in temperature to meet manufacturers specifications P 8 7 Because of the sensitivity and quick response time of the ACM6000 and K Type thermocouple the readings will reveal higher highs and lower lows than are possible with dial type thermometers 8 When testing is complete move the instrument power switch to OFF and remove the thermocouple ATA1 Temp Probe Adapter Fig 3 Battery replacement When the low battery symbol is displayed on the LCD replace the battery with a new one Dispose of batteries in accordance with your local solid waste disposal regulations Never expose batteries to high temperature or incineration 1 Turn the AD
25. t power switch to OFF NOTE If the cranking voltage drops below 9 0 volts on 12 volts systems the vehicle will not start reliably Regulator operating voltage The voltage regulator must maintain sufficient voltage to keep the vehicle battery properly charged The Charging Voltage can be tested using the ACM6000 Test procedure 1 Start the vehicle engine e All accessories OFF e Run until engine is at operating temperature 2 Slide the ACM6000 power switch to the ON position 3 Turn the ACM6000 rotary function switch to V 4 Connect the test leads to the meter A Connect the black COM lead probe tip to the battery negative post B Connect the red VWF lead probe tip to the battery positive post 5 System voltage reading should be 13 1 volts to 14 2 volts e Check the vehicle service manual for exact specifications 7 When testing is complete move the instrument power switch to OFF and disconnect the test leads NOTE See the illustration on page 22 for test lead hookup instructions TIP Low Voltage Check connections drive belt faulty voltage regulator High Voltage Usually indicates a faulty voltage requlator Potentiometer tests Automotive computer engine management systems depend upon signals from potentiometer to determine fuel distribution and ignition timing If these devices fail or become intermittently faulty erroneous data is fed to the computer resulting in poor fuel economy and drive
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