all-sun EM577 Automotive battery tester vehicular battery cold TEMP.effects starter motor tester digital battery load tester
This tester is designed for automotive battery load voltage test,charging voltage test and starter motor test.It is very useful and can be used in vehicle\'s fault diagnosis and service.
Battery Load Test This test evaluates a battery\'s ability to crank an engine.The tester draws current from the battery while measuring its voltage level.The voltage level of a good battery will remains relatively steady under load,but a defective battery will show a reapid loss in voltage.Battery size(CCA rating)and temperature will effect test result-follow instruction carelly. 1.Turn off the vehicle\'s engine,accessoried and battery test equipment. 2.Connect the black clamp to the negative battery terminal and the red clamp to the positive battery terminal.Ensure the connections are good. 3.Note the battery\'s CCA rating. If the rating is not printed on the battery,use the following guideliness to estimate battery size. Small(4cyl)300 CCA;Medium(6cyl)400 CCA; Large(8cyl)500CCA. 4.Press the SET CCA button repeatedly and quickly until the CCA value on the display matches your battery. The default is 500 CCA,but you can adjust to 600,700,800,900,999(1000),300, 400CCA. At each change of CCA value,the tester will sounf a short beep. 5.With the clamps connected,the tester will display the battery\'s state of charge.If the charge state is less than 12V(for 12V batteries) or 6V(for 6V batteries), the battery should be recharged before load test.If recharging can not bring voltage to a value higher than 12V(for 12V batteries) or 6V(for 6V batteries),the battery is defective.If the display does not show digit,check for loose or reversed clamps;otherwise the battery is defective. 6.For load test,just press the LOAD button and then release it.The tester sounds a long beep and then automatially does load test for 10secs.(Therefore,it is not necessary to press the LOAD button for 10 secs.)If you do load test for battery with less than 12V(for 12V batteries) or 6V(for 6V batteries),the display will show"-L-".This indicates you should recharge the battery and refer to step 5. 7.After the 10 secs load test,the tester will sound two beeps indicating load test is done.During load test,you can read load voltage on the display or the LED for status of load test.For example,good, week or bad. 8.After reading load voltage,please refer to the Battery Load Test Analysis section. Battery Load Test Analysis
Tester Indication During Load Test
The “GOOD” LED lights.
Battery capacity is ok.Battery may or may not be fully charged, check specific gravity of the battery fluid to determine the state of charge. If the battery is not fully charge, check for electrical drain or possible system fault. Recharge battery to full charge level.
The “WEEK” LED or “BAD” LED lights, but reading remains steady.
Battery capacity is not satisfactoty. Battery may be either defective or not fully charged.Check specific gravity of battery fluid to determine which condition exists.If charging can not bring specific gravity to that of full charge level,battery should be replaced.
The “WEEK” LED or “BAD” LED lights, but displayed voltage is falling.
Battery may be defective or very run down.After 10 secs load test ends,note the voltage reading on the display.Voltage recovery to 12V/6V or above within seconds indicates defective battery.Slow voltage recovery indicates run down condition,For best results,check specific gravity.