1. OVERVIEW
The Auto Tester is designed to assist Automotive Technicians when troubleshooting electrical problems on a vehicle. It can be used to check current drains
directly at the vehicle fusebox without removing fuses, which greatly speeds up fault finding.
It can also measure Battery voltage, Starter cranking voltages, Alternator charging voltages, Resistance, Frequency and Duty cycle. It is also able to check circuit
continuity and check components such as diodes and LEDs. The tester is designed to be simple to use with none of the unnecessary settings often found on
general purpose multi-meters.
Current measurement – AMPS (A)
There are two methods provided for testing current draw:-
Direct Current Testing
The conventional way of measuring current involves connecting a multi-meter in series with the circuit under test by first removing cables. The Auto Meter is
able measure current directly from the two exposed points on the rear of a fuse (Mini, ATC or Maxi) without the need to removing it first. This method is faster
and also allows much larger currents up to 80 amps to be tested.
In-Line Current Testing
By inserting the current adapter, the Auto Tester can also be used like a traditional multi-meter buy measuring amps in-line with the operating circuit. Two
ranges are provided depending on the range and accuracy of measurement required. The smaller range (1mA – 1A) is useful for accurate measurement of
parasitic drains on a vehicle battery.
Voltage measurement - VOLTS (V)
This mode can measure battery voltages up to 50 volts. An additional ‘traffic light’ voltage indicator provides a fast indication of charge on 6, 12 & 24V battery
systems.
Starter Test (12V/24V vehicles)
This setting checks battery health during starting by measuring the voltage drop whilst under load of the starter motor.
Alternator Test (Normal and Smart 12V/24V alternators)
Provides a check of alternator charging voltages to ensure they fall within normal operating ranges. It can also perform a diode ripple test to check failure of
any alternator diodes.
Resistance measurement - OHMS (Ω)
Allows the resistance of electrical components such as sensors to be checked for short circuit or open circuit failure.
Frequency measurement - HERTZ (Hz)
This setting allows regular pulses in a circuit to be detected and measured. Examples of use would be fuel injectors, rotation sensors and proximity sensors.
Duty cycle measurement - %
Duty cycle measurement helps indicate the percentage of time a device is active and is useful to check if a sensors are being triggered correctly.
Continuity Test
When this mode is selected, you can test the continuity of the cable, circuit or common ground. The beeper will sound when the continuity is good.
Diode & LED Test
Whilst in the Continuity test mode, the condition of diodes and LEDs can also be tested.
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10422 RMM500 Instructions UK 140x170mm 15pp MULTI LANGUAGE.indb 2
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