Allsun EM287 Electrical Circuit Tester Probe User Manual

Allsun EM287 Electrical Circuit Tester Probe

INTRODUCTION

This unit is the best electrical tester for reducing diagnostic time in automotive electrical systems. After a simple hook-up of the unit to the vehicle’s battery, the automotive technician can conduct a positive or negative battery current to the tip by rocking the rock switch forward or backward. The unit can be used to measure de voltage and test for continuity or for bad ground contacts, It can also be used to follow and locate short circuits. It is short-circuit protected, its long cable allows you to perform tests easily.

The unit is powered by the vehicle battery directly.

Applications:

1. Tests for continuity
2. Tests the polarity of a voltage
3. Measures the voltage from 2V to 24V
4. Checks lamp
5. Checks electric motor.
6. Follows and locates short circuits
7. Tests for bad ground contacts
8. Illumination

GENERAL SPECIFICATIONS

• Operation Voltage: 8 – 24Vdc
• Cable Length: about 5m
• DC Voltage Measurement Range: 2 – 24Vdc
• Overload Protection: 8A ( When the current exceeds 8A, the unit will disconnect the current automatically. )
• Operation Temperature: 0°C – 40°C, < 75%RH
• Storage Temperature: -20°C – 50°C, < 85%RH
• Size : 274X53X42mm ( for main body only)
• Weight: about 385g

WARNING

1. Do not use the unit around explosive gas, vapor, or dust. When the rock switch is pressed (or rocked), battery current is conducted directly to the tip which may cause sparks when contacting ground or certain circuits.
2. The unit is not to be used with 110/220-volt house current, it is only for use with de 2 – 24V systems.
3. Do not use AC voltage.
4. After you finish checking the vehicle, correctly restore all the connections that you disconnected.
5. Always follow the instructions and procedures indicated in the vehicle’s service manual before attempting to disconnect any part or subsystem of the electrical circuit.
6. Use caution when using the unit to perform the measurement. Never touch any dangerous part of the vehicle with your hand for safety. Don’t touch any live conductor with your hand or skin.
7. Don’t use it if it is damaged.
8. Some components of vehicles work on lower voltage, they can not withstand the voltage applied by the unit. To avoid damage to these components, don’t use the unit to apply voltage to them directly or indirectly.
9. Before you drive a vehicle, always make sure that the vehicle is safe and reliable.
10. Don’t use the unit if the vehicle is being driven.

INSTRUCTION

1. Red Battery Clip
2. Black Battery Clip
3. Probe
4. llluminator
5. Test Indicator
6. Voltage Indicator There are 10 voltage indicators for indicating the reading of de voltage measurement.
7. Rock Switch It includes a front part ” -“, and a rear part “= “. When you press the front part” -“, the probe is connected to the red battery clip directly. When you press the rear part”=”, the probe is connected to the black battery clip directly.
8. Selection Switch There are two range positions for the selection switch: VOLTAGE range is for measuring de voltage only. TEST range is for all the other tests.
9. TOUCH Metal It is used for turning on or off the illuminator.
10. Auxiliary Ground Lead It is connected to the black battery clip directly.

OPERATION INSTRUCTION

Hook-up

• Unroll the unit’s cable.
• Clamp the red battery clip to the positive terminal of the vehicle’s battery.
• Clamp the black battery clip to the negative terminal of the vehicle’s battery.
• The unit starts self-test, and as indications, the built-in buzzer sounds, the test indicator’s green light, red light and the illuminator’s light appear in turn. Several seconds later, the self-test finishes.

Note: The buzzer sounded continuously and then sounded discontinuously.

Testing the Unit and the Connections

• Press the front part ( ” – ” ) of the rock switch, the test indicator should light RED.
• Press the rear part ( “= ” ), the test indicator should light GREEN.
• The unit is now ready for use.
• If the test indicator did not light, the cause may be that the clip connections are not good or the unit is damaged.

Using Illumination

• To turn on or off the illuminator, keep the clip of the auxiliary ground lead in contact with the TOUCH metal for about 0.5 second and then remove the clip from the TOUCH metal.

Measuring DC Voltage

• Set the selection switch to” VOLTAGE” position.
• Connect the probe to the more positive terminal of the circuit to be measured, and the clip of the auxiliary ground lead to the more negative terminal of the circuit.
• The voltage indicators will illuminate to indicate the voltage of the circuit.

Polarity Test

Note: Set the selection switch to” TEST” position.

• Contacting the probe’s tip to a positive (+ ) circuit will light the test indicator RED. Contacting the probe’s tip to a negative(-) circuit will light the test indicator GREEN. Contacting the probe’s tip to an open circuit does not turn on the test indicator.

Continuity Test

Note:

1. Set the selection switch to” TEST” position.
2. Don’t press the rock switch.

By using the probe tip together with the auxiliary ground lead, continuity can be tested on wires and components which are disconnected from the vehicle’s electrical system. When continuity is present, the test indicator will light GREEN.

Activating Components out of the Vehicle’s

Electrical System

Note: Set the selection switch to” TEST” position.

• By using the probe tip together with the auxiliary ground lead, components can be activated, thereby testing their function.
• Connect the auxiliary ground lead’s clip to the negative terminal of the component to be tested. Contact the probe to the positive terminal of the component, the test indicator should light GREEN indicating continuity through the component.

While keeping an eye on the green test indicator, quickly press and release the rock switch’s front part (” -“). If the green test indicator changed instantly from GREEN to RED, you may proceed with further activation. If the green test indicator went off at that instant, the unit has been overloaded. This could happen for the following reasons:

• The contact of the tip is a direct ground or negative voltage.
• The component is short-circuited.
• The component is a high amperage component ( i.e. starter motor).

Activate fuel pumps, starter solenoids, magnetic clutches, blower motors, cooling fans, lights etc.

Testing Trailer Lamps and Connections

1. Set the selection switch to” TEST” position.
2. Connect the unit to a good battery.
3. Clip the clip of the auxiliary ground lead to the trailer ground.
4. Probe the contacts at the jack while pressing the rock switch’s front part (” -“). This lets you check the operation and orientation of the trailer lamps.

Activating Electrical Components

Note: Set the selection switch to” TEST” position.

• Activating components with positive(+) voltage
  Contact the probe tip to the positive terminal of the component, the test indicator should light GREEN. While keeping an eye on the green indicator, quickly press and release the rock switch’s front part (” – ” ). If the green indicator changed instantly from GREEN to RED, you may proceed with further activation. If the green indicator went off at that instant, the unit has been overloaded. This could happen for the following reasons:

  • The tip’s contact is a direct ground.
  • The component is short-circuited.
  • The component is a high current component (i.e. starter motor).

Warning: Haphazardly applying voltage to certain circuits can cause damage to a vehicle’s electronic components. Therefore, it is strongly advised to use the correct schematic and diagnosing procedure while performing test.

Activating electrical components with negative (-) voltage

Contact the probe tip to the negative terminal of the component, the test indicator should light RED.

While keeping an eye on the red test indicator, quickly press and release the rock switch’s rear part ( “= ” ). If the red test indicator changed instantly from RED to GREEN, you may proceed with further activation. If the test indicator went off at that instant, the unit has been overloaded. This could have happened for the following reasons:

1. The tip’s contact is a direct positive voltage.
2. The component is short-circuited.
3. The component is a high amperage component (i.e. starter motor).

WARNING: With this function a vehicle’s fuse can be blown or tripped if grounding the contact in series with it.

Jumper Lead Feature

Note: Set the selection switch to” TEST” position.

• The black battery clip and the auxiliary ground lead are connected directly through the unit. By leaving the red battery clip disconnected from the vehicle’s battery, the unit can be used as a long jumper lead.
• Be careful to avoid short circuit and overloading when using this jumper function. In this configuration, the leads are not protected by the unit’s built-in circuit breaker.

Checking for Bad Ground Contacts

Note: Set the selection switch to” TEST” position.

• Probe the suspected ground wire or contact with the probe tip. Observe the green test indicator.
• Press the rock switch’s front part (” -” ) then release.
• If the test indicator changed from GREEN to RED, this is not a true ground.
• If the test indicator turned off when you pressed the rock switch’s front part(” -” ) , this circuit is likely a direct ground. Keep in mind that high current components such as starter motors will also cause the test indicator to turn off in this check.

Following and Locating Short Circuits

Note: Set the selection switch to” TEST” position.

In most cases a short circuit causes a fuse blowing or a circuit breaker tripping. Here is the best place to begin the search. Remove the blown fuse from the fuse box. Connect the probe tip to each of both contacts in the fuse box and press the rock switch’s front part (” -” ). The side which causes the test indicator to turn off when you press the rock switch’s front part (” -” ) is the shorted circuit. Note this wire’s identification code or color. Follow the wire as far as you can along the wiring harness, for instance if you are following a short in the brake light circuit you may know that the wire must pass though the wiring harness at the door sill. Locate the color-coded wire in the harness and expose it. Probe through the insulation of the wire with the probe tip and press the rock switch’s front part (” -” ) to energize the wire. If the test indicator turns off, this wire is verifed to be the shorted wire. Cut the wire and energize each end with the probe tip. The wire which causes the test indicter to turn off will lead you to the shorted area. Follow the wire in the shorted direction and repeat this procedure until you find the exact position of the short.

NOTE The unit is equipped with a built-in circuit breaker for overload protection. After the circuit breaker trips, it will be reset automatically

DECLARATION

1. This manual is subject to change without notice.
2. Our company will not take the other responsibilities for any loss.
3. The content of this manual can not be used as the reason to use the unit for any special application.

DISPOSAL OF THIS ARTICLE

Dear Customer,

If you at some point intend to dispose of this article, then please keep in mind that many of its components consist of valuable materials, which can be recycled. Please do not discharge it in the garbage bin, but check with your local council for recycling facilities in your area.

FREQUENTLY ASKED QUESTIONS

What is the Allsun EM287 Electrical Circuit Tester Probe?

The Allsun EM287 Electrical Circuit Tester Probe is a diagnostic tool designed for testing electrical circuits in automotive applications, ensuring accurate voltage readings.

What is the price of the Allsun EM287 Electrical Circuit Tester Probe?

The Allsun EM287 Electrical Circuit Tester Probe is priced at $26.20, making it an affordable tool for automotive diagnostics.

What is the power source for the Allsun EM287 Electrical Circuit Tester Probe?

The Allsun EM287 Electrical Circuit Tester Probe is powered by both battery and electric sources, providing flexibility for various testing scenarios.

What are the dimensions of the Allsun EM287 Electrical Circuit Tester Probe?

The item dimensions of the Allsun EM287 Electrical Circuit Tester Probe are 10.79 x 2.09 x 1.65 inches, making it compact for storage and use.

How much does the Allsun EM287 Electrical Circuit Tester Probe weigh?

The Allsun EM287 Electrical Circuit Tester Probe weighs 13.05 ounces, making it lightweight and easy to handle.

What is the model number for the Allsun Electrical Circuit Tester Probe?

The model number for the Allsun EM287 Electrical Circuit Tester Probe is EM287, which can help identify the product.

Who is the manufacturer of the Allsun EM287 Electrical Circuit Tester Probe?

The Allsun EM287 Electrical Circuit Tester Probe is manufactured by Zhangzhou Haimao Dianzi Keji Co., LTD, known for producing quality electronic tools.

What style does the Allsun EM287 Electrical Circuit Tester Probe represent?

The Allsun EM287 Electrical Circuit Tester Probe is categorized under automotive tools, specifically designed for circuit testing and diagnostics.

How does the Allsun EM287 Electrical Circuit Tester Probe assist in automotive repairs?

The Allsun EM287 Electrical Circuit Tester Probe helps technicians diagnose electrical issues by measuring voltage and testing circuit continuity.

What types of tests can be performed with the Allsun EM287 Electrical Circuit Tester Probe?

The Allsun EM287 Electrical Circuit Tester Probe can perform tests for circuit voltage, continuity, and polarity, making it a versatile diagnostic tool.

What makes the Allsun EM287 Electrical Circuit Tester Probe a valuable tool for DIY mechanics?

The Allsun EM287 Electrical Circuit Tester Probe is valuable for DIY mechanics due to its affordability, accuracy, and ability to quickly identify electrical problems.

Why is my Allsun EM287 Electrical Circuit Tester Probe not powering on?

Ensure that the tester is connected to a 6V-24V power source. Check the fuse in the power circuit, and verify that the ground clip is properly connected to a clean metal surface.

Why is the Allsun EM287 Electrical Circuit Tester Probe showing inaccurate voltage readings?

Make sure the probe is properly connected to the circuit, and there is no corrosion or dirt obstructing the contact points. If the readings fluctuate, ensure the power source is stable and within the correct voltage range.

Why is the Allsun EM287 Electrical Circuit Tester Probe not detecting continuity in a circuit?

Ensure that the circuit is de-energized when testing for continuity. A live circuit can interfere with the results. Check that both ends of the wire are exposed for a good connection.

Why is the Allsun EM287 Electrical Circuit Tester Probe's LED light not turning on during use?

The LED will light up only when there is power in the circuit. Ensure the circuit is live and the tester is properly connected. If the LED remains off, the probe or wiring may be faulty.

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