Low Amp Probe - Snap-on
Contents
1. and the black to GND COM 3 2 Switch on When the probe is turned on the RED LED illuminates You will also notice that when the battery voltage is too low for normal operation the LED flashes to warn the user that the battery needs to be changed The Battery Replacement procedure is described in section 5 0 3 3 Low Amp Current Probe Zero Adjustment The Snap on Low Amp Current Probe has a push button auto zero feature The output zero offset voltage of the probe may change due to thermal shifts and other environmental conditions To adjust the output voltage to zero 1 Ensure that the probe is away from the current carrying conductor 2 Connect the Low Amp Current Probe to your instrument and select the voltage scale to view the reading 3 Turn the Low Amp Current Probe on by using the On Off and Range Selector switch to select the 20A or 60A scale Press the Zero button 3 4 Error Factor Current probes work by reading the magnetic field around a conductor The error factor is the amount of induced error or false reading from a current probe Some current probes can have an error factor of over 100 mA This induced error reading can be caused by many magnetic fields Any device that generates a magnetic field can induce an error Even the earth s magnetic field has an influence on current probes To reduce the error factor zero the Low Amp Current Probe in the same direction and inclination as intended use 3 5 Read2. q 150 S S fA 2 00 250 3 00 0 01 2000 1500 1000 Ss E sm gt 3 2 50 5 1000 1500 2000 20 600 400 S 20 E o gt Ez 3 o gt 3 2 5 3 200 400 600 Input Current A 5 0 BATTERY REPLACEMENT The RED LED flashes when the minimum operating voltage is approached indicating that the battery needs to be replaced refer to Figure 9 When replacing the battery use the 9 volt alkaline PP3 MN1604 type only Using any other type of battery in the Snap on Low Amp Current Probe will invalidate your warranty To replace the battery 1 2 3 Loosen the captive screw that secures the Unclamp the probe from the conductor Using the On Off and Range Selector switch turn the Low Amp probe off Disconnect the output leads from external equipment battery cover Lift the cover through 30 and pull it clear of the probe body as shown in Figure 9 The battery is then accessible Insert the new 9 volt alkaline battery Replace the battery cover and re tighten the battery cover release screw Aa BATTERY COVER BATTERY COVER RELEASE SCREW Figure 9 11 6 0 CLEANING Clean the case periodically by wiping it with a damp cloth and detergent Do not use abrasive cleaners or solvents Do not immerse the probe in liquids 12 7 0 WARRANTY SNAP ON INCOR
3. 0 Amp range the probe output is 10 mV per 1 Amp BATTERY COVER RELEASE SCREW UNDERNEATH BATTERY COVER ON OFF amp RANGE SELECTOR SWITCH ZERO BUTTON ON OFF amp LOW BATTERY INDICATING LED Figure 1 2 2 0 SPECIFICATIONS 2 1 Electrical Data Current ranges Measuring range Output sensitivity Accuracy 20A Range Accuracy 60A Range Resolution Load impedance Conductor position Sensitivity reading Frequency range Temperature coefficient Power supply 20A 60A AC PEAK or DC 20A 60A 100mV 10mV A 1 of reading 5mA 2 of reading 50mA 1mA 10mA gt 10kOhm and lt 100pF 1 relative to center DC to 50kHz 3dB 0 1 of reading 9V Alkaline PP3 MN1604 50 Hours low battery indicator Working voltage see Safety Standards section 150V AC RMS or DC 2 2 General Data Maximum conductor size Output connection Output zero Cable length Operating temperature range 12mm diameter 4mm safety plugs Auto zero via push button 1 5 meters 0to 50 32 to 122 F Storage temperature range 20 to 85 4 to 185 F Operating humidity Weight 15 to 85 non condensing 250g 0 55lb 3 0 OPERATING INSTRUCTIONS Refer to Figure 1 on page 2 3 1 Connecting the probe To connect the probe to the test equipment connect the red plug of the probe connector to CH1
4. 3141 1410 ZEETA308D Printed 11 03
5. 98 FCC Part 15 Class B SAFETY The following symbols appear on the products WARNING Read instruction manual and safety messages before using product Double Reinforced Insulation Jg gt Read all instructions completely before using this product To avoid electric shock use caution during installation and use of this product High voltages and currents may be present in circuit under test gt CE Complies with the relevant European standards This equipment should for disposal be separated as Waste Electrical and Electronic Equipment according to the EU directive 2002 96 EC gt lt Low Amp Probe EETA308D Reference Manual March 2011 AONAD EI For Technical Assistance Call 1 800 424 7226 North America 44 0 845 601 4736 United Kingdom For technical assistance in all other markets contact your selling agent The information specifications and illustrations in this manual are based on the latest information available at the time of publication The manufacturer reserves the right to make equipment changes at any time without notice 2011 Snap on Incorporated Contents Page 1 0 Introduction unnersssnnnennnnnnennnnnnnnnnnnnnnnnnnnnennnnnnnnnn 2 2 0 Specifications uennensnnnnennnnnnnnnnnnnnnnennnnnnnnnennnnnnnnn 3 21Blectrical Data ns 3 2 2 General Data u ica riada 3 3 0 Operating Instructions ooooonnconcncnnnonnnnancnnnennnnnnn 4 3 1 Connecting the Probe oocioccc
6. Low Amp Probe EETA308D Reference Manual SNA SAFETY WARNING Risk of Personal injury Do not apply over 150 VAC RMS or DC Do not change the battery while the instrument is attached to a power source Make sure the unit power is OFF before opening the battery compartment Keep yourself test leads clothing and other objects clear of electrical connections and hot or moving engine parts Do not use if the probe or any part of the probe including the lead and connectors appear to be damaged or if a malfunction of the instrument is suspected WARNING Risk of electrical shock This product is intended for Measurement Category for example automotive 12V systems Do not use it for Measurement Categories Il IIl and IV Measurement Category is for measurements performed on circuits not directly connected to MAINS or MAINS circuits an example of MAINS circuit is 120VAC or 240VAC household or industrial circuits Do not connect this product to MAINS or MAINS circuits Do not exceed voltage limits between inputs as indicated on the rating label Use extreme caution when working with circuits that have greater than 40 VAC or 24 VDC Do not connect to damaged or un insulated conductors SAFETY Safety Standards BSEN61010 1 2001 BSEN61010 2 032 2002 BSEN61010 031 2002 150 Vrms Category Rated Transient Overvoltage 800V Pollution Degree 2 EMC Standards BSEN 61326 2 2 2006 19
7. PORATED WARRANTS THAT SNAP ON ELECTRONIC DIAGNOSTIC PRODUCTS ARE FREE FROM DEFECTS IN WORKMANSHIP AND MATERIALS Snap on will repair or replace this product if it fails to give satisfactory service due to defective workmanship or materials This warranty for Snap on electronic diagnostic products is for ONE YEAR from the date of the original purchase Repair or replacement shall be at the election and expense of Snap on Except where unreasonable the product must be returned to Snap on or a Snap on dealer for warranty service Snap on does not provide any warranty for products subjected to abnormal use Abnormal use includes misuse modification unreasonable use neglect lack of maintenance use in production related service or use after the tool is significantly worn Consumable products are not covered by any warranty Consumable products are goods reasonably expected to be used up or damaged during use including but not limited to filters ribbons printer paper gases oxygen sensors batteries and air conditioning leak detector tips SNAP ON SHALL NOT BE LIABLE FOR ANY INCIDENTAL SPECIAL OR CONSEQUENTIAL COST OR DAMAGES INCURRED BY THE PURCHASER OR OTHERS including without limitations lost profits revenues anticipated sales business opportunities goodwill or interruption of business and any other injury or damage Some states do not allow the exclusion or limitation of incidental or consequential damages so the abo
8. applicable To check injector current at the fuse box 1 Locate the fuse box and remove the injector fuse s 2 Install an inline fuse harness in place of the fuse 3 Clamp the Low Amp Current Probe around the inline fuse harness On sequential fuel injected vehicles each waveform represents current flow through one injector On bank fired injectors each waveform represents current flow through the injector bank The injector waveform should have a gradual rise or ramp as the current begins to flow through the injector or the injector bank Current flow through each injector or injector bank should be about the same refer to Figure 6 Figure 6 If an injector or an injector bank has high current flow suspect a shorted injector refer to Figure 7 LW Figure 7 If an injector peak is missing Suspect an open injector wiring or defective PCM driver circuit refer to Figure 8 Figure 8 To measure amperage measure the maximum voltage of the waveform and use 100 mV 1A for calculation 9 4 0 CURRENT PROBE CHARACTERISTICS Frequency Response 01 1 10 Frequency kHz Typical Linearity in 20A Range 100 15 10 5 o 5 10 Input Current A Typical Linearity in 60A Range 0 00 0 50 1 00 a 2 E 2
9. complete the Setup steps below Setup 1 Use the On Off and Range Selector switch to select the 20A setting 2 Perform the Low Amp Current Probe Zero Adjustment procedure refer to section 3 3 Test Important Note If the vehicle has more than one fuel pump test each pump independently To measure fuel pump current 1 Clamp the Low Amp Current Probe jaws around the fuel pump voltage supply circuit near the fuel tank or at the fuel pump relay 2 Verify that the probe jaws are fully closed The fuel pump current readings display 3 If a negative waveform displays open the probe jaws and clamp the probe in the opposite direction Humps in the waveform represent the condition of the pump commutator and brushes Figure 2 Waveform humps are considered normal Figure 2 Figure 3 As brushes wear the waveform will degrade and the pump speed may slow down refer to Figure 3 Tech Note If the fuel pump is difficult to access it may be possible to check the fuel pump current at the fuse box if applicable To check the fuel pump current at the fuse box 1 Locate fuse box and remove the fuel pump fuse 2 Install an inline fuse harness in place of the fuse 3 Clamp the Low Amp Current Probe around the inline fuse harness Fuel Pump RPM Calculations Most fuel pumps run at about 5000 to 6000 RPM and draw about 6 to 8 Amps Pumps may cause driveability symptoms below 3000 RPM Most fuel pump commutators
10. have 8 segments Using an 8 segment commutator as an example RPM may be estimated by measuring the delta time of the 8 humps present in the waveform One of the formulas to find RPM is 60 000 the number of ms in a minute divided by the time measurement of the 8 humps of the waveform Let s say if in our example that the time measurement of the 8 humps is 12 ms we would divide 60 000 by 12 to get 5000 RPM To measure amperage measure the average voltage of the waveform and use 100 mV 1A for calculation 3 6 3 Ignition Coil Current Measurement Recommended Probe Setting 20A Note Before taking measurements or clamping the probe jaws around any wire complete the Setup steps below Setup 1 Use the On Off and Range Selector switch to select the 20A setting 2 Perform the Low Amp Current Probe Zero Adjustment procedure refer to section 3 3 Test To measure ignition coil current 1 Clamp the Low Amp Current probe around the B side or the control side wire of the ignition coil Do not clamp the probe around both wires 2 Verify that the probe jaws are fully closed The ignition coil current readings display 3 If a negative waveform appears open the probe jaws and clamp the probe in opposite direction The ignition coil waveform should have a gradual rise or ramp as current begins to flow refer to Figure 4 Figure 4 If the vehicle is DIS equipped current flow through each coil should be about the same If the
11. ignition coil waveform has a sharp rise at the beginning of the ramp upward suspect shorted coil windings refer to Figure 5 Ml Figure 5 To measure amperage measure the maximum voltage of the waveform and use 100 mV 1A for calculation Tech Note If the ignition coil is difficult to access it may be possible to check the ignition coil current at the fuse box if applicable To check the ignition coil current at the fuse box 1 Locate fuse box and remove the ignition or DIS fuse s 2 Install an inline fuse harness in place of the fuse 3 Clamp the Low Amp Current Probe around the inline fuse harness 3 6 4 Injector Current Measurement Recommended Probe Setting 20A Note Before taking measurements or clamping the probe jaws around any wire complete the Setup steps below Setup 1 Use the On Off and Range Selector switch to select the 20A setting 2 Perform the Low Amp Current Probe Zero Adjustment procedure refer to section 3 3 Test To measure injector current 1 Clamp the Low Amp Current Probe around the B side or the control side wire of injector Do not clamp the probe around both wires 2 Verify that the probe jaws are fully closed The injector current readings display 3 If a negative waveform displays open the jaws and clamp the probe in the opposite direction Tech Note If injectors are difficult to access it may be possible to check injector current at the fuse box if
12. ing the mV scale When reading the millivolt scale remember that a probe setting of 100mV equals 1 Amp 20Amp scale on the Snap on Low Amp Current Probe Similarly A reading of 0 8mV 8mA A reading of 1 8mV 18mA A reading of 21 8mV 218mA A reading of 100mV 1000mA or 1A 3 6 Current Measurement Applications 3 6 1 Parasitic Draw Measurement Recommended Probe Setting 20A scale Note Before taking measurements or clamping the probe jaws around any wire complete the Setup steps below Setup 1 Use the On Off and Range Selector switch to select the 20A setting 2 Perform the Low Amp Current Probe Zero Adjustment procedure refer to section 3 3 Test To measure parasitic draw 1 Clamp the Low Amp Current Probe jaws around the B supply wire to the power distribution box or to the positive or negative battery cable The parasitic draw readings display 2 If a negative reading displays open the probe jaws and clamp the probe in the opposite direction Note Computer controlled vehicles require a small amount of current to keep module memories alive Refer to the appropriate vehicle service manual for module time out and maximum parasitic draw information The term time out refers to the amount of time that modules operate before going into sleep mode 3 6 2 Fuel Pump Current Measurement Recommended Probe Setting 20A Note Before taking measurements or clamping the probe jaws around any wire
13. innccnncccconccnncccnonncnnnncnnn 4 3 2 Switch On eie eia aaeei 4 3 3 Low Amp Current Probe Zero Adjustment 4 3 4 Error Facto tomara reo 4 3 5 Reading the mV Scale EEE E 5 3 6 Current Measurement Applicatione 5 4 0 Current Probe Characteristices 10 5 0 Battery Replacement ncccconcccnnnonnncnnnancnonanannnnnnnas 11 6 0 Cleaning PS n DB ga 12 7 0 Warranty s i i si s nk disa anaietan eain annain tashna ana dR KA 13 8 0 Declaration of Conformity 14 1 0 INTRODUCTION The Snap on Low Amp Current Probe measures AC or DC current with digital multimeters oscilloscopes and other suitable recording instruments The probe provides accurate and reliable non intrusive testing of ignition coils injectors fuel pumps relays electric motors and parasitic draw The jaws of the probe are designed with a built in hook feature to help isolate wires refer to Figure 1 Using advanced Hall Effect technology the Snap on Low Amp Probe accurately measures currents from 10 mA to 60 Amps with a resolution of 1mA over the frequency range of DC to 50 kHz The probe has two scales 0 to 20 Amps and 0 to 60 Amps The Snap on Low Amp Current Probe outputs an analog voltage based on current flow through the circuit The output is millivolts AC or DC For example in the 0 to 20 Amp range the probe output is 100 mV per 1 Amp In the 0 to 6
14. ve limitation or exclusion may not apply to you This is your exclusive remedy and is in place of all other rights and remedies You may have other rights which vary from state to state or country SNAP ON INCORPORATED Kenosha WI 53141 1410 13 8 0 DECLARATION OF CONFORMITY MAprosys EC Declaration of Conformity Document number CE017 We GMC PROSyS 1 Potter Place Skelmersdale Lancashire WNS 9PH Certify that the product s described below is are in conformity with the following directivefs 2006 95 EC Low Voltage Directive for Electrical Safety gt 2 anne The product s has havo been assessed by application of the following standards or specifications Low Voltage Directive BS EN 6101041 2001 Safety requirements for electrical equipment for measurement control and laboratory use BS EN 61010 2 032 2002 Particular requirement andheld and hand manipulated current sensors for electrical test and measurement The product s has havo been assessed by application of the following standards or specifications EN 61326 2 2 2006 Susceptibility Criteria A Safety requirements for electrical equipment for measurement Emission 8 control and laboratory use 1 certy for end on bahait of GAC PROSYS La Bt he product mentioned above conter to te requrements mentioned GMC I PROSS Lid 4 ente 2 gt ke e WHE SPH United K ngdor Page 1 of 1 14 NOTES NOTES Snap on Kenosha WI 5
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