Acron Hand Tools User Manual
Contents
1. be careful of all exposed metal when making electri cal measurements 5 Never hold multimeter when making electrical measurements Place the multimeter on a clean insulated surface before making any elec trical measurements OPERATING INSTRUCTIONS CAUTION When making voltage or current measurements form the habit of turning off all power to the circuit under test and discharge any capacitors and inductors Connect the test leads at the desired points in the circuit and then turn on the power while taking readings Tum off the power and discharge any capacitors and inductors be fore disconnecting the test leads from the circuit PRELIMINARY ADJUSTMENTS Adjust the meter pointer to the Zero mark at the left side of the black scale before making any measurements First check to see if the meter pointer indicates Zero at the extreme left end of the black scale If it is off Zero use a small screwdriver to turn the mechanical adjuster screw on the meter movement slowly CW clockwise or CCW counterclock wise until the meter pointer is exactly over the Zero mark INTERNAL BATTERY CHECK Important A 1 5V AA cell battery must be installed before using the CP7849 See Battery Replacement In order to check the battery condition set the function range switch to the RX10 position and touch the ends of the two test leads together Rotate the Zero Adjuster thumbwheel located on the left side of the multimeter until the pointer i2. cell battery must be installed before using the CP7849 1 Rotate the function range switch to the OFF position Remove protective boot Remove screws from rear of multimeter and lift off the back cover Install a new 1 5V AA cell battery Observe the polarity marks Carefully replace the back cover and tighten the screws Be careful not to over tighten the screws because the threads in the case may become stripped 6 Replace protective boot FUSE REPLACEMENT Important If the multimeter won t work at all check the fuse located inside the multimeter If the fuse is blown all functions stop working 1 Rotate the function range switch to the OFF position 2 Remove protective boot 3 Remove screws from rear of multimeter and lift off the back cover 4 Replace blown fuse with a new Fast Acting 5mm X 20mm 500mA 250V fuse 5 Carefully replace the back cover and tighten the screws Be careful not to over tighten the screws because the threads in the case may become stripped 6 Replace protective boot ow MN HAND TOOLS
3. quickly as possible Check the multimeter operation on that range by applying an appro priate input If the multimeter does not operate properly check the fuse if it is blown replace it See Fuse Replacement OPERATING PROCEDURES DC VOLTAGE MEASUREMENT 1 Read all SAFETY PRECAUTIONS 2 Set the function range switch to the appropriate DC voltage range If the voltage is unknown use the highest range 3 If the polarity of the circuit to be tested is known connect the BLACK probe to the negative voltage side of the circuit and the RED probe to the positive voltage side 4 If the polarity of the circuit to be tested is not known connect the probes to opposite sides of the circuit and watch the meter pointer If the meter pointer deflects to the left reverse the probes The RED probe will now be connected to the positive voltage side 5 Use the black scale for reading DC voltage measurements DC CURRENT MEASUREMENT 1 Read all SAFETY PRECAUTIONS 2 Set the function range switch to the appropriate DC mA range If the current is unknown use the highest range 3 Using the test leads connect the multimeter in series with the circuit under test If the meter pointer deflects to the left reverse the test probes 4 Use the black scale for reading DC mA measurements AC VOLTAGE MEASUREMENT 1 Read all SAFETY PRECAUTIONS 2 Set the function range switch to the appropriate AC voltage range If the voltage is u
4. testing 1 5V and 9V batteries under load 7 Protective Caps Keep the caps on when the multimeter is not in use 8 Test leads 9 OFF When the multimeter is not in use keep the function range switch in the OFF position 10 DC VOLTS This function is used to measure DC Direct Current voltages ACTRON 11 Function range switch A 16 position switch located at the center of the meter This switch is used to select the function and range to be measured 12 DC milliamps This function is used for measuring the DC Current Direct Current 13 Mechanical adjuster A screw located directly below the center of the meter scale The mechanical adjuster is used to set the meter pointer to the Zero mark at the left side of the black scale Power supply One 1 5V size AA cell battery for Ohmmeter Size amp Weight with protective boot 88mm x 155 mm x 49 mn 288 g SAFETY PRECAUTIONS 1 Always visually inspect the multimeter test leads and circuit under test for damage prior to every use 2 Turn off power and discharge any capacitors and inductors prior to connecting or removing test leads from an electrical circuit or elec tronic equipment 3 Always keep yourself isolated from an electrical circuit when making measurements When possible use one hand to make measurements 4 Never allow yourself to be grounded when making electrical mea surements Stand on a rubber mat wear dry clothing use insulated test probes and
5. ANALOG MULTIMETER CP7849 D 413 Py OQ ADJ A 4 L 2 l E Ee 5 L l ay py mR 6 OPERATING INSTRUCTIONS GENERAL DESCRIPTION The CP7849 Analog Multimeter is a rugged accurate easy to operate compact instrument The stable linear meter movement allows it to make accurate measurements of AC and DC voltages DC currents in the milliamp range resistance and decibels The multimeter uses the most modern components and circuit techniques designed in a high impact case If the tester is kept clean and is not subjected to extreme shock or continuous vibration it will provide many years of trouble free service SPECIFICATIONS ELECTRICAL Range 19 measuring ranges DC voltage 0 2 5 10 50 250 500 volts AC voltage 0 10 50 500 volts DC current 0 0 5 10 250 mA Resistance RX10 Ohm RX1kOhm Decibel 10 dB to 56 dB at AC volt ranges Accuracies DC V mA AC V Resistance 5 of Full Scale BAT test 1 5V and 9V batteries 10 of Full Scale MULTIMETER BASIC FUNCTIONS 1 Protective boot 2 Meter 3 OHMS This function is used for measuring the resistance of a com ponent 4 Zero Adjuster A thumbwheel adjustment located on the left side of the multimeter The zero adjuster is used to zero the meter pointer when making resistance measurements 5 AC VOLTS This function is used for measuring AC Alternating Cur rent voltages 6 BAT This function is used for
6. function range switch Multiply read ing by 1K 10000 for the RX1K position and by 10 for the RX10 switch position The units for the RX10 position are Ohms Q 7 lf there is little or no meter pointer movement from the left side of the green OHMS scale rotate the function range switch to a higher range in an effort to get a greater deflection of the meter pointer The most accurate reading on an ohmmeter ranges between the middle of the scale and Zero Ohms BATTERY CHECK 1 Read all SAFETY PRECAUTIONS 2 Set the selector switch to the appropriate BAT range 3 Touch and hold the RED test lead to the positive battery terminal and the BLACK test lead to the negative battery terminal 4 Read the BAT scale to determine the battery condition If the reading is in the red BAD zone the battery should be replaced If the read ing is in the green GOOD zone the battery has considerable life left If the reading is in the zone the battery should be replaced soon because the remaining power is very low MAINTENANCE GENERAL 1 No periodic maintenance is required other than replacement of the battery fuse and visual inspection of the multimeter 2 Keep the instrument clean and dry Do not use solvent for cleaning use a damp cloth 3 The only field replaceable parts are the 1 5V AA cell battery and the Fast Acting 5mm X 20mm 500mA 250V fuse BATTERY REPLACEMENT Important A 1 5V AA
7. ndicates Zero on the green OHMS scale If the pointer cannot be brought to the Zero mark replace the 1 5 volt size AA cell battery See Battery Replacement OPERATING SUGGESTIONS 1 Set the range switch to the proper position before taking any mea surement 2 Never apply more voltage or current than the amount noted in each position 3 When the voltage or current to be measured is not known always start with the highest range in each case 4 If the meter pointer is in the lower half of the scale and falls within the range of a lower function range switch position then rotate the function range switch to the lower range for greatest accuracy 5 If none of the multimeter functions work at all check the fuse lo cated inside the multimeter on the printed circuit board If the fuse is blown replace it See Fuse Replacement 6 Avoid placing the multimeter in a place where severe vibration is encountered Do not store it in excessively hot or damp places 7 Do not check resistance when voltage or current is present in the circuit 8 Discharge a capacitor before measuring it 9 When the multimeter is not in use keep the function range switch in the OFF position This provides a direct short across the meter movement stabilizing the needle for minimum needle bounce when transporting the multimeter 10 If excessive voltage or current is accidentally applied on a certain range disconnect the leads from the circuit as
8. nknown use the highest range 3 Connect the RED and BLACK test probes to opposite sides of the AC voltage source Polarity of test probes is not important when mea suring AC voltage 4 Use the red scale for 10V AC voltage measurements Use the black scale for 50V and 500V AC voltage measurements DECIBEL 1 Read all SAFETY PRECAUTIONS 2 Set the function range switch to the appropriate AC voltage range for the dB range you wish to measure 3 For a function range switch setting of 10 AC V read the dB directly from the bottom red scale For other AC V settings of the function range switch add the appropriate number of dB to the dB scale read ing as noted on the chart at the lower right corner of the meter face RESISTANCE MEASUREMENT 1 Read all SAFETY PRECAUTIONS 2 Turn off all power in circuit before making resistance measurements 3 Set the function range switch to the appropriate OHM range If the resistance is unknown use the highest range 4 Touch the ends of the two test leads together Rotate the Zero Ad juster thumbwheel located on the left side of the multimeter until the pointer indicates Zero on the green OHMS scale If the pointer can not be brought to the Zero mark replace the 1 5 volt size AA cell battery See Battery Replacement 5 Connect the test probes across the resistance to be measured 6 Take a reading on the green OHMS scale and multiply it by the mul tiplication factor indicated by the
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