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1. 6 Reconnect the battery or apply power to the circuit being tested 7 Read the results on the display CAUTION After the test is completed shut the power off to the circuit before removing the test leads and before recon necting any disconnected wires or devices NOTE If the reading obtained is a negative number reverse the lest leads 14 15 CLAMP CURRENT MEASUREMENT NOTE Clamp current measurement requires use of an optional Clamp adapter The optional Clamp adapter has not been eval uated by UL 1 Plug the RED test lead from the Clamp adapter to the ATO jack of the tester plug the BLACK test lead into the COM jack 2 Set the testers Function Range Selector Switch to the AO position see Controls and Indicators Item 11 3 Clamp the Clamp adapter around the wire or cable from the Source or load under measurement 4 Read the results on the display BATTERY TEST 1 Plug the RED test lead into the BAT jack of the tester plug the BLACK test lead into the COM jack 2 Determine the voltage rating of the battery to be tested 3 Set the testers Function Range Selector Switch to the desired Battery Test position see Controls and Indicators Item 12 4 Place the RED test lead on the positive post of the bat tery under test place the BLACK lead on the negative post 5 Read the results on the display L COP RPM AND RPM TACH MEASUREMENT 1 A WARNING A Risk of Explosi
2. for a germanium diode when the leads are connected in one polarity and a very high resistance or open circuit when the leads are reversed connected in the opposite polarity 1 Plug the RED test lead into the gt jack of the tester plug the BLACK test lead into the COM jack 2 Set the tester s Function Range Selector Switch to the 4 position see Controls and Indicators Item 3 3 Press the SEL button as necessary until the gt F icon is shown on the display 4 Place the RED test lead onto one side of the diode being tested and the BLACK test lead onto the other side 5 Read the results on the display 6 Reverse the test leads and again read the results on the dis play Compare the two readings One reading should indi cate a voltage drop value the other reading should indicate an overrange OL condition See note above D CONTINUITY TEST A WARNING A To avoid electric shock shut off the power to the test arti cle before testing it for continuity 1 Plug the RED test lead into the jack of the tester plug the BLACK test lead into the COM jack 2 Set the tester s Function Range Selector Switch to the 4 t position see Controls and Indicators Item 3 3 Press the SEL button as necessary until the 2 icon is shown on the display 4 Place the RED Test Lead to one end of the wire or device being tested for continuity and the BLACK Test Lead to the opposite end 5 Listen
3. or minimum readings that were achieved during a test 1 To record Maximum Minimum readings press and release the MAX MIN button to place the tester in MAX MIN mode The MAX icon will be visible on the display Perform the desired test the maximum reading achieved during the test will be recorded and saved in the tester s memory Press the MAX MIN button again The MIN icon will be visi ble on the display Perform the desired test the minimum reading achieved during the test will be recorded and saved in the tester s memory e To scroll between MAX and MIN readings that are stored in the testers memroy rapidly press and release the MAX MIN button To exit MAX MIN mode press and hold MAX MIN button for approximately 2 3 seconds or until MAX MIN icons disap pear from the display e Thetester will save the MAX MIN readings in memory until the MAX MIN mode is exited or the tester is turned off NOTE MAX MIN functions is not applicable to the Diode Continuity or Frequency Functions BATTERY AND FUSE REPLACEMENT 17 1 Turn the Digital Automotive Tester OFF and remove the test leads 2 Replace the fuse or batteries as necessary e For battery replacement Remove one screw from the battery compartment cover Use your finger or a small coin to remove the cover Remove the batteries and replace them with two AA 1 1 2 Volt alkaline batteries e For fuse replacement Remove the three screws you must
4. remove the meter stand to remove the third screw on the back of the meter and separate the case Remove the fuse from the fuse holder and replace with a 0 500A 250V UL Listed Bussmann GMA Type Radio Shack GMA 270 Series 44270 1047 fuse NOTE Use a 0 500A 250V 5x20mm type fuse ONLY Bussmann GMA Type Radio Shack 4270 1047 or similar Using an incorrect fuse may result in serious injury and or damage to the unit 3 Reassemble the cover case and secure with the screws MAINTENANCE 1 No periodic maintenance is required other than the replace ment of the battery the fuse and visual inspection of the meter 2 Keepthe tester clean and dry DO NOT use solvent to clean use a damp not wet cloth and fully dry after cleaning 3 The only replaceable parts are the 1 5 AA batteries 0 500A 250V fuse see page 17 for battery and fuse replacement and the Test Leads for Test Leads call serv ice department 18 LIMITED ONE YEAR WARRANTY The Manufacturer warrants to the original purchaser that this unit is free of defects in materials and workmanship under normal use and maintenance for a period of one 1 year from the date of original purchase If the unit fails within the one 1 year period it will be repaired or replaced at the Manufacturer s option at no charge when returned prepaid to the Service Center with Proof of Purchase The sales receipt may be used for this purpose Installation labor is not covered
5. under this war ranty All replacement parts whether new or remanufac tured assume as their warranty period only the remaining time of this warranty This warranty does not apply to damage caused by improper use accident abuse improper voltage service fire flood lightning or other acts of Goa or if the product was altered or repaired by anyone other than the Manufacturer s Service Center The Manufacturer under no circumstances shall be liable for any consequential damages for breach of any written warranty of this unit This warranty gives you specific legal rights and you may also have rights which vary from state to state This manual is copyrighted with all rights reserved No portion of this document may be copied or reproduced by any means without the express written permission of the Manufacturer THIS WARRANTY IS NOT TRANSFER ABLE For service send via U P S if possible prepaid to Manufacturer Allow 3 4 weeks for service repair SERVICE PROCEDURES If you have any questions require technical support or information UPDATES and OPTIONAL ACCES SORIES please contact your local store distributor or the Service Center USA amp Canada 800 544 4124 6 00 AM 6 00 PM Monday Friday PST All others 714 241 6802 6 00 AM 6 00 PM Monday Friday PST FAX 714 432 7511 24 hr Web www iEQUUS com 22 TECHNICAL ASSISTANCE AS WE EMPLOY TECHNICIANS CERTIFIED BY ASE ONLY L
6. when performing current measurements follow all steps as indicated below DO NOT skip any steps or take any short cuts The 15 range is not fused To avoid current hazard and or damage to the tester DO NOT try to take meas urements on circuits that have more than 15 amps DO NOT take more than 10 seconds to take the reading A waiting period of AT LEAST 15 MINUTES is necessary between every 15 second testing period 1 Plug the RED test lead into the M S or the 15 jack of the tester as applicable plug the BLACK test lead to the jack 2 Set the testers Function Range Selector Switch to the appropriate Amps range position as desired see Controls and Indicators ltems 9 and 10 e Use the SEL button see Controls and Indicators item 20 to select DC Amps or AC Amps as desired e To measure from 0 to 400mA set the Selector Switch to mA e To measure from 400mA to 15 Amps DC set the Selector Switch to the 15 position 3 Disconnect the battery or shut off the power to the circuit being tested NOTE To measure current on a particular circuit you must open up the circuit and connect the test leads in series with the circuit before a reading can be obtained 4 Disconnect one end of the wire or device from the circuit where current will be measured 5 Place the RED test lead on the disconnected wire and place the BLACK test lead at the location from which the wire was disconnected series connection
7. DIGITAL CAE AUTOMOTIVE TESTER OWNER S MANUAL Quickly pinpoints electrical problems for a variety of household hobby and automotive components Table of Contents Title Page No INTRODUCTION 004 222 22 as 2 SAFETY PRECAUTIONS WARNINGS 2 SPEGIFIGATIONS ass 3 CONTROLS AND INDICATORS 8 TESTING PROCEDURES 10 AUXILIARY FUNCTIONS 16 BATTERY AND FUSE REPLACEMENT 17 MAINTENANGE iome cua 2 oat ete AE wane eR RENS 18 SERVICE PROCEDURES 22 INTRODUCTION Congratulations You have purchased a precision instrument manufactured to the highest quality standards This Digital Automotive Tester is a general purpose instrument designed for use in general electronics home electrical applications and automotive electrical electronic systems This tester is designed to test or measure AC voltage DC voltage batteries current AC current resistance diodes continuity frequency duty cycle pulse width rpm and temperature Please take the time to read these operating instructions thor oughly and completely Failure to follow these instructions may result in electrical shock instrument damage and or damage to the equipment under test Always use extreme caution when working on or around electrically operated equipment SAFETY PRECAUTIONS WARNINGS Do not operate thi
8. EMPERATURE Range Accuracy Overload Protection 32 F to 104 F 5 F 3 C 0 C to 40 C 58 F to 392 F 1 5 5 F 50 C to 200 C 1 596 3 C 0 5A 250V fast fuse 392 F to 752 F 2 5 F 200 C to 400 C 42 3 C A WARNING A To avoid fire and or electrical shock hazards DO NOT con nect the thermocouples to circuits greater than 30 Vrms 42 4 Vpk or 60 Vac FREQUENCY Resolution Accuracy Overload Protection 0 001Hz 0 1 of reading 250V DC or AC RMS 4 5 digits Sensitivity 100kHz 2V RMS 100kHz 5V RMS DUTY CYCLE PULSE WIDTH DWELL Function Range Accuracy Overload Protection Duty Cycle 0 1 to 2 0 of 99 9 reading 5 digits Pulse Width 1 to 999 3 0 of 0 5A 250V fast fuse ms positive reading 2 ms Dwell Angle 1 12 2 0 of cylinders reading 5 digits RPM Range Resolution Accuracy Overload Protection 0 10000 1RPM 2 0 of RPM reading 0 5A 250V fast fuse 4 5 digits Frequency response 50 400Hz A WARNING A Risk of Explosion This equipment has internal arcing sparking parts which should not be exposed to flammable vapors This equipment is only suitable for installation in a garage having sufficient air circulation to be considered a non hazardous location A WARNING A Ignition coils produce a very high voltage To reduce the risks of electric shock when conducting RPM tests DO
9. ET US SHOW YOU THEIR CREDENTIALS www iEQUUS com INNOVA Innova Electronics Corp PRODUCT DESIGN amp COPYRIGHT 17291 Mt Herrmann Street Fountain Valley CA 92708 Printed in China Instruction MRP 493 0067
10. NOT touch the uninsulated ends of the test probes the ignition coil or the coil terminals when the engine is running CONTROLS AND INDICATORS 1 10 11 12 DCV Function Measures DC volts Auto ranging from O to 600 volts 10 MQ impedance ACV Function Measures AC volts Auto ranging from 0 to 600 volts 10 MQ impedance Press SEL button see item 19 to select desired function e Resistance Function C2 Measures resistance Auto ranging from 0 to 40 40 000 000 e Continuity Function Tests for continuity be tween two points e Diode Function gt For testing diodes Frequency Function Measures frequency One range 9 999Hz to 2MHz Pulse Width Function Measures the length of time in mil liseconds that a solenoid or actuator is energized ON time during a one cycle time period One range 1 to 999 ms Duty Cycle Function Measures the percentage of time that a solenoid or actuator is energized ON time during a one cycle time period One range 0 1 to 99 996 Temperature Function Celcius Measures temperature in C Auto ranging from 50 C to 400 C Optional K Type thermocouple required Temperature Function Fahrenheit Measures tempera ture in F Auto ranging from 58 F to 752 F Optional K Type thermocouple required Press SEL button see item 19 to select desired function ACmA Function Measures AC current in milliamps On
11. UREMENT NOTE Turn the vehicle s engine off BEFORE connecting the multimeter for DWELL ANGLE MEASUREMENT 1 5 o Plug the RED test lead into the 4 jack of the tester plug the BLACK test lead into the COM jack Place the RED test lead to the BREAKER POINTS or terminal of the ignition coil and the BLACK test lead to GROUND or the terminal of the battery o Set the tester s Function Range Selector Switch to the 4 position see Controls and Indicators Item 15 Press the CYL button as necessary until the correct num ber of cylinders for the vehicle under test is shown on the display Start the engine and read the results on the display AUXILIARY FUNCTIONS A DATA HOLD FUNCTION The data HOLD function lets you lock the currently displayed value into the display The value remains on the display until the fu nction is turned off 16 With the desired value shown on the display press and hold the HOLD button for approximately two seconds until the HOLD icon shows on the display The current value is now locked in the display Press the HOLD button again to turn the function off The HOLD icon will disappear and the value will no longer be locked in the display NOTE The data HOLD function is not available for the DIODE TEST CONTINUITY TEST or PULSE WIDTH MEASUREMENT B MINIMUM MAXIMUM VALUE FUNCTION The MAX MIN function records and saves the maximum and
12. are done Always consider electrical and electronic equipment to be ener gized live Never assume any equipment is de energized Do not connect probes to any available unused terminal while the meter is connected to a hazardous live circuit Never ground yourself when taking electrical measurements Isolate yourself from ground by using dry rubber insulating mats to cover all exposed grounded metal Stand on rubber mats and wear dry clothing Never take resistance measurements on energized live electrical or electronic equipment Use one hand instead of two whenever possible to take measurements If two hands must be used use extreme cau tion not to contact any energized conductors with your hands Be certain test leads are dry and clean Do not hold the tester when taking measurements Place the tester on a clean insulating surface prior to taking any meas urement Don t become part of the circuit Think safety Act safely If working on a vehicle take the following added precautions Only work on vehicle in a well ventilated area Always wear safety eye protection Avoid moving fan blades or any potentially moving parts Avoid hot engine parts Put transmission in park automatic transmission vehicles or neutral manual transmission vehicles Set the parking brake Turn the ignition off before connecting or disconnecting any testing equipment Put blocks on drive wheels Avoid wearing loose cloth
13. cy Overload Protection 100uV 1 2 of reading 8 digits 250V DC RMS x 0 896 of reading 8 digits 1 2 of reading 8 digits 600V 600V DC AC RMS Input impedance 10MA for all ranges Frequency response 50 400Hz RESISTANCE OHMS Resolution Accuracy Overload Protection 0 10 19 100 1000 x 1 096 of reading 4 5 digits 2 0 of reading 4 5 digits 10kQ DC CURRENT AMPS Resolution Accuracy 250V DC AC Overload Protection 1 5 of reading 5 digits 40mA 10nA 400mA 100uA 0 5A 250V fast fuse Input Voltage Drop 0 2V x 2 576 of 15A 10mA reading 5 digits Unfused 15sec maximum Input Voltage Drop 0 2V A waiting period of at least 15 minutes is necessary between every 15 second testing period AC CURRENT AMPS Range Resolution Accuracy Overload Protection 40mA 104A 2 0 of 400mA 100uA reading 5 digits Frequency response 50 400Hz 0 5A 250V fast fuse Input Voltage Drop lt 0 2V BATTERY TEST Resolution DC Current Load 10mV 10mA DIODE CONTINUITY TESTS Function Range Resolution Description Diode Test 2V 1mV Test Current 1 0 6mA Test Voltage Overload Approx 2 8 Protection Continuity Approx 1200 or 250V DC or Test less buzzer AC RMS beeper will sound T
14. e range 0 to 400 milliamps e DCmA Function Measures DC current in milliamps One range 0 to 400 milliamps 15A Function Measures DC current One range 15Amps DC from 0 to 15 amperes Unfused Clamp Current Function 0 Measures AC DC cur rent optional Clamp adapter required Battery Load Test Function Two positions Tests small bat teries 1 5V 9V 25 24 16 23 13 14 15 16 17 18 19 20 21 22 23 24 25 26 COP RPM Function Measures RPM on vehicles with Coil On Plug ignition systems One range O to 10 000 rpm RPM Tach Function Measures RPM One range 0 to 10 000 rpm o Dwell Angle Function 4 Measures dwell angle of break er points OFF Function Turns unit off when function is selected Function Range Selector Switch Selects desired function or range Data HOLD Button Turns the Data Hold function and off see Auxiliary Functions on page 16 for details MAX MIN Record Function Turns the Maximum Value Minimum Value Record Mode on and off see Auxiliary Functions on page 16 for details SEL Select Button Selects the desired function when the Function Range Selector Switch item 17 is set to the Resistance Continuity Diode position item 3 position item 9 or Clamp Current Position item 11 CYL Cylinder Button Selects the number of cylinders for the vehicle under test when the Function Ran
15. ge Selector Switch item 17 is set to the RPM Tach function item 14 or Dwell Angle function item 15 Volts OHMS DIODE CONTINUITY and FREQUENCY Input Jack COM Input Jack Common Input Jack 15A Input Jack For red test lead probe connection when measuring high DC current up to 15 amps only DWELL ANGLE MS F BAT ACmA DCmA CLAMP CURRENT RPM and COP Input Jack Liquid Crystal Display LCD Displays results of tests or measurements Preparation and Caution Before Use Inspect the Digital Automotive Tester for damage to the case Do not use if cracked distorted excessively dirty or any abnormal condition exists Inspect the test leads for damage Check for cracked insula tion broken or damaged probes loose or bent probe pins Do not use if any abnormal condition exists Set the Function Range Selector Switch to the proper range BEFORE taking measurements If the range function must be switched during a test ALWAYS remove the test leads from the circuit being measured before switching settings To avoid possible electric shock instrument damage and or equipment damage when taking voltage or current measure ments DO NOT exceed the maximum value of the selected range If the tester is used near high noise Radio Frequency RF generating equipment spark plug wires ignition coils or alternator the display may become unstable or indicate large errors lf you obtain erratic readings during use isola
16. he vehicle s Service Manual for proper connections 4 Read the results on the display G DUTY CYCLE MEASUREMENT Duty Cycle is the percentage of time that a solenoid or actuator is energized ON time during a one cycle time period Duty Cycle is measured in percent 1 Plug the RED test lead into the 4 jack of the tester plug the BLACK test lead into the jack 2 Set the testers Function Range Selector Switch to the DUTY position see Controls and Indicators Item 6 3 Place the RED test lead onto the signal wire of the sensor or circuit under test and the BLACK test lead onto a good chassis ground consult the wiring diagram in the vehicle s Service Manual for proper connections 4 Read the results on the display H TEMPERATURE MEASUREMENT A WARNING To avoid fire and or electrical shock hazards DO NOT con nect the thermocouples to circuits greater than 30 Vrms 42 4 Vpk or 60 Vac NOTE Temperature measurement requires use of an optional K type thermocouple 1 Plug the Positive test lead of the K type thermocouple into the jack of the tester plug the Negative test lead into the 15 jack 2 Set the testers Function Range Selector Switch to the C or F position as desired see Controls and Indicators Items 7 and 8 3 Read the results on the display l AC DC CURRENT MEASUREMENT AMPS A WARNING To prevent electrical shock
17. ing or jewelry when working on a vehicle Read your vehicle s service manual and follow it s safety pro cedures SPECIFICATIONS GENERAL SPECIFICATIONS AND FEATURES 3 3 4 digit LCD display maximum reading of 4000 Range Control Auto Range Automatic negative polarity indication e Automatic zero adjustment Over range indicator except 15 A function Displays OL on LCD Low battery indicator Displays battery symbol on LCD Automatic power shut off after 10 idle minutes Pollution Degree 2 Measuring circuit category II Operating environment Temperature 32 to 104 F 0 C to 40 C Humidity Less than 80 relative humidity non condensing Altitude up to 6562 ft 2000 meters Storage environment Temperature 4 to 140 F 20 to 60 C Humidity Less than 90 relative humidity non condensing e Power Supply Two 1 5V AA batteries Fuse 0 500A 250V 5X20 mm Radio Shack GMA 270 series 1270 1047 fuse Dimensions Height 6 81 in 173 mm Width 6 57 in 167 mm includes test lead clips Depth 1 69 in 43 mm Weight including batteries approximately 9 1 oz 260 g ELECTRICAL SPECIFICATIONS DC VOLTS Resolution Accuracy Overload Protection 100uV 250V DC RMS 0 8 of 1mV reading 10mV 5 digits 600V 600V DC AC RMS 1V 0 8 of reading 5 digits Input impedance 10MA for all ranges AC VOLTS Resolution Accura
18. on This equipment has internal arcing and sparking parts which should not be exposed to flammable vapors This equipment is only suitable for installation in a garage having sufficient air circulation to be considered a non hazardous location A WARNING A Ignition coils produce a very high voltage To reduce the risk of electric shock when conducting RPM tests DO NOT touch the uninsulated ends of the test probes the ignition coil or the coil terminals when the engine is running Plug the RED test lead into the RPM jack of the tester plug the BLACK test lead into the COM jack Place the RED test lead onto the Tachometer Signal port of the vehicle s ignition system or onto the negative side of the ignition coil Place the BLACK test lead onto a good chassis ground or the negative terminal of the battery NOTE If your vehicle is equipped with a COP Coil On Plug system and you are using the or setting make the RED test lead connection to the negative side of one of the ignition coils Set the testers Function Range Selector Switch to the SOF or RPM position as appropriate see Controls and Indicators Items 13 and 14 Press the CYL button as necessary until the correct num ber of cylinders for the vehicle under test is shown on the display NOTE Cylinder selection is not applicable to COP Coil On Plug systems Start the engine and read the results on the display DWELL ANGLE MEAS
19. s tester before reading this manual in its entirety The following guidelines must be followed to avoid acci dents that can result in electric shock or personal injury Pay close attention to WARNINGS stamped on the front and rear of the tester s case These warnings as well as all warnings and precautions used through out this manual must be followed to avoid electric shock and or personal injury The RESPONSIBLE PARTY shall be made aware that if the equipment is used in a manner not specified by the manu facturer the protection provided by the equipment may be impaired Before using any of the functions on this tester verify its proper operation on a known similar function source where the unit value is also known Take corrective action based on the indicated results To prevent electrical shock and or damage to the tester or the equipment under test observe the following safety precautions DO NOT apply more than the rated voltage as marked on the tester between terminals or between any terminal and earth ground Use caution when working above 30V AC rms 42 V peak or 60 V DC Such voltages pose a shock hazard To avoid false readings that could lead to possible electric shock or personal injury replace the batteries as soon as the low battery indicator displays Always inspect the tester test leads and any other acces sories for damage prior to every use If any damage is found do not use tester until repairs
20. te the tester as far away as possible from these components TESTING PROCEDURES A AC DC VOLTAGE MEASUREMENT A WARNING A To avoid possible electric shock instrument damage and or equipment damage DO NOT attempt to measure voltages ABOVE 600V AC DC or take measurements if the voltage is unknown 600V AC DC between the COM and V jacks is the maximum voltage that this instrument is designed to measure The COM terminal potential should not exceed 300V AC DC measured to ground 1 Plug the BLACK test lead into COM jack of the tester plug the RED test lead into the V jack NOTE If alligator clip adapters not included with tester are to be used on the test leads use suitable rated and UL certified alligator clips 2 Set the testers Function Range Selector Switch to the appropriate Y DCV or Y ACV position as desired see Controls and Indicators Items 1 and 2 3 Place the RED test lead onto the positive side of the item being tested and the BLACK test lead onto the negative across the source load side of the item BE CAREFUL not to touch any energized conductors with any part of your bogy 4 Read the results on the display B RESISTANCE MEASUREMENT Q OHMS A WARNING A Resistance measurements must be made on de ener gized dead circuits ONLY Impressing a voltage across the multimeter s terminals while set to any resistance range may result in electric shock instrument damage and or damage
21. to equipment under test MAKE SURE equipment is completely de energized before taking any resistance measurements 11 1 Plug the RED test lead into the Q jack of the tester plug the BLACK test lead into the jack 2 Set the tester s Function Range Selector Switch to the 4 position see Controls and Indicators Item 3 3 Press the SEL button as necessary until the AUTO icon is shown on the display NOTE To obtain accurate readings disconnect at least one side of the item under test from the circuit or circuit board before measuring resistance 4 Place the RED test lead onto one side of the item being test ed and the BLACK test lead onto the other side of the item Polarity does not matter when checking resistance 5 Read the results on the display C DIODE TEST A WARNING A To avoid electrical shock and or damage to the multimeter ensure the power is removed from the circuit before any DIODE testing procedure is conducted Test diodes on de energized dead circuits only never on live circuits NOTE A diode is a semiconductor device that lets current flow in one direction only If the diode to be tested is part of a circuit with other electronic components you must isolate it from the other components by disconnecting at least one side of it from the circuit before testing A good diode will show a low voltage drop across its junction 0 5 0 8 volts for a silicon diode or about 0 3V
22. to the sound of the beeper and confirm the results by reading the display NOTE The beeper will sound only if the continuity of the item under test resistance between the two test leads measures less than 120 ohms E FREQUENCY MEASUREMENT Frequency is the number of times that an event repeats itself during a one second time period Frequency is measured in Hertz Hz 1 Plug the RED test lead into the Hz jack of the tester plug the BLACK test lead into the COM jack 2 Set the testers Function Range Selector Switch to the Hz position see Controls and Indicators Item 4 3 Place the RED test lead onto the signal output wire of the sensor or circuit under test and the BLACK test lead onto a good chassis ground consult the wiring diagram in the vehi cle s Service Manual for proper connections 4 Read the results on the display F PULSE WIDTH MEASUREMENT Pulse Width is the length of time that a solenoid or actuator is energized ON time during a one cycle time period Pulse Width is measured in milliseconds ms 1 Plug the RED test lead into the ms jack of the tester plug the BLACK test lead into the COM jack 12 2 Set the testers Function Range Selector Switch to the ms position see Controls and Indicators Item 5 3 Place the RED test lead onto the signal output wire of the sensor or circuit under test and the BLACK test lead onto a good chassis ground consult the wiring diagram in t

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