Automotive Multimeter

Transcription

1 Automotive Multimeter IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE THE PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. PLEASE KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE. Read User's Instructions carefully before installing, operating, serving or repairing this tool. Keep these instructions in a safe accessible place.

2 At-891 is a compact, rugged, battery operative, handhold 3 1/2 digits automotive engine analyzer multimeter for measuring RPM,DWELL ANGLE, DCV, ACV, OHMS, DIODE, CONTINUITY, DCA TEMPERATURE.It is an ideal instrument for all drivers. SPECIFICATIONS 1.1 GENERAL SPECIFICATIONS Display : 3 1/2 digits LCD with a max. reading of 1999 Polarity : Automatic negative polarity indication.. Zero adjustment : Automatic. Overrange indication : only the 1 display. Lowbattery : The is display. Safety standards : CE EMC/LVD. The meter is up to the standards of IEC1010 Pollution Degree 2, Overvoltage Category Ⅱ or double insulation Ⅱ. Operating environment : Temperature 32 to 104 (0 to 40 ), humidity<85% RH. Storage environment : Temperature 4 to 140 (-20 to 60 ),humidity<95% RH. Power : Single,standard 9-volt battery, NEDA 1604IEC 6F 22. Dimension : 190mm 88.5mm 27.5mm Weight :Approx. 320g(including battery and holster). 1.2 ELECTRICAL SPECIFICATIONS Accuracy is ±(% of reading + number in last digit) at 23±5, <75% RH DC Voltage Impedance: 10MΩ Overload protection: 1000V DC/AC RMS AC Voltage - 1 -

3 Impedance: 10MΩ Frequency response: 200V: 40Hz---400Hz; 750V: 40Hz---200Hz Overload protection: 500V DC/AC RMS Resistance: Overload protection: 250V DC/AC RMS DC Current Overload protection: 20A/250V fuse 20A up to 15 seconds Temperature (Using K type thermocoupe probe) Diode test: Continuity Test Tachometer RPM: ±(1.5%of rdg + 8 digits) Overload protection: 250V DC/AC RMS - 2 -

4 1.2.9 Dwell : ±(1.5%of rdg + 8 digits) 3 CYL CYL CYL CYL CYL Transistor hfe Test (1) Set the FUNCTION switch the hfe range. (2) Determine whether the transistor is NPN or PNP and locate the Emitter. Base and collector leads. Insert the leads into the proper holes in the socker on the front panel. (3) The display will read the approximated hfe value at the test condition Base current 10uA, Vce 3V back light Press button " LIGHT" backlight illume,again press once backlight breath go out Function switch indicator lamp: New style patent of function direction light, easy use in dark place HOLD Push the HOLD button to lock display value, push it again to exit. OPERATION Warning 1) When measuring voltage ensure that instrument is not connected or switched to a current or resistance Range, or to the diode check,always ensure that the correct terminals are used for the type of measurement to be made. 2) Use extreme care when measuring voltage above 50V, especially from sources where high Energy is existed. 3) Avoid making connections to live circuits whenever possible. 4) When making current measurements ensure that the circuit not live before opening it in order to connect the test leads. 5) Before making resistance measurements or diode test, ensure that the circuit under test is De--energized. 6) Always ensure that the correct function and range is selected. If in doubt about the correct range to use, start whit the highest and work downwards. 7) Extreme care should be taken when using the instrument to conjunction with a current Transformer connected to the terminals if an open circuit occurs. 8) Ensure that the test leads and probes are in good condition with no damage to the insulation. 9) Take care not to exceed the over-lode limits as given in the specification

5 10) Fuse for replacement must be of the correct type and rating. 11) Before opening the case of the instrument to replace battery, disconnect the test leads from any external circuit, set the selector switch to OFF position. 2.1 DC Voltage measurement 1) Connect the black test lead to COM socket and red lead to the VΩ socket. 2) Set the selector switch to desired DCV position and connect the probes across the source or load under measurement. 2.2 AC Voltage measurement 1) Connect the black test lead to COM socket and red lead to the VΩ socket. 2) Set the selector switch to desired ACV position and connect the probes across the source or load under measurement. 2.3 DC Current measurement 1) Connect the black test lead to COM socket and red lead to the 20A socket. 2) Set the selector switch to desired current range position. 3) Set the selector switch to desired DCA position and connect the probes across the source or load under measurement. 2.4 Resistance and continuity measurement 1) Connect the black test lead to COM socket and redlead to the VΩ socket. 2) Set the selector switch to desired resistance range position or position. 3) Connect the probes across circuit to be tested. Caution: Ensure that the circuit to be tested is dead. Max. input over-load: 250V RMS And<10sec. 2.5 Diode Test 1) Connect the black test lead to COM socket and red test leads to the VΩ socket. 2) Set the selector switch to position. 3) Connect the black and red test probe to cathode (-) and anode (+) ends of diode to be tested respectively. 2.6 Temperature measurement Set the selector switch to the TEMP / range and connect the K type thermocouple s black test lead to TEMP- socket and red test lead to the T+ socket. A. The temperature function shows the random number at ordinary times, must insert the thermocouple in temperature test hole while examining temperature. In order to guarantee the accuracy of the measurement, need to close Light switch while measuring temperature.; B. This meter inclosure WRNM-010 type contact thermocouple limit temperature is 250 (300 shortly ) ; C. Please don't change the thermocouple at will, otherwise we can't - 4 -

6 guarantee to measure accuracy ; D. Please don t importing the voltage in the temperature function. 2.7 RPM (TACH ) measurement 1) Connect the black test lead to COM socket and red test leads to the VΩ socket. 2) Connect the red test probe to BREAKER POINTS or terminal of IGNITION CIOL,and connect the black probe to GROUND or terminal of battery. 3) Set the selector switch to the TACH position for 3cyl,4cyl, 5cyl, 6cyl, 8cyl, according to the engine cylinders. For any TACH signal with a given frequency, in convention ignition system: RPM=120 freq cyl. in DIS ignition system: RPM=120 freq 2. 4) Start the engine and read engine RPM. 2.8 DWELL ANGLE measurement 1) Connect the black test lead to COM socket and red test lead to the VΩ socket. 2) Connect the red test probe to BREAKER POINTS or terminal of IGNITION CIOL,and connect the black probe to GROUND or terminal of battery. 3) Set the selector switch to the DWELL position for 3cyl, 4cyl, 5cyl, 6cyl, 8cyl, according to the engine cylinders. 4) Start engine the display will show the DWELL ANGLE of points. ACARE AND MAINTENANCE 3.1 CARING FOR YOUR MULTIMETER Your digital multimeter is an example of superior design and craftsmanship. The following Suggestions will help you care for the milimeter so you can enjoy it for years. 1) Keep the multimeter dry. If it gets wet, wipe it dry immediately. Liquids can contain minerals that Can corrode electronic circuits 2) Use and store the multimeter only in normal temperature environments, Temperature extremes Can shorten the life of electronic devices, damage the batteries, and distort or melt plastic parts. 3) Handle the multimeter gently and carefully. Dropping it can damage the circuit boards and case and can cause fthe multimeter to work improperly although the holster can provide enough protection. 4) Keep the multimeter away from dust and dirt, which can cause premature wear of ports. 5) Wipe the multimeter with a damp cloth occasionally to keep it looking new. Do not use harsh Chemicals, cleaning solvents, or strong detergents to clean the multimeter

7 6) Use only fresh batteries of the required size and type.always remove old or weak batteries. They Can leak chemicals that destroy electronic circuits. 3.2 MAINTENANCE 9-volt battery replacement A. Ensure the instrument is not connected to any external circuit. snap fastener OFF Position and remove the test leads from the terminals. B. Remove the screw on the bottom case and lift the battery case. Remove the spent battery and Replace it with a battery of the same type. C. Please take out the battery when not using for a long time. NOTE: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice. IMPORTANT: No liability is accepted for incorrect use of this product