AstroAI DM130B Digital Multimeter Owner’s Manual

AstroAI DM130B Digital Multimeter

Thank you for purchasing the True RMS 4000 Count Digital Multimeter from AstroAl. The AstroAl True RMS Digital Multimeter is designed to be safely and accurately used by professionals and weekend DIYers alike. This manual provides all safety information, operation instructions, specifications, and maintenance for the meter. The instrument performs AC/DC Voltage, AC/DC Current, Resistance, Audible Continuity Testing, Battery Voltage, Diode Testing, NCV Detection, and Capacitance Testing. Thank you again for choosing Astrol, if you have any questions or concerns regarding your product, please contact us at support@astroai.com.

NOTE: Fully read and understand this manual before using this Digital Multimeter.

If you are a beginner to multimeters, please read and keep this manual for reference.

WARNING:

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment being tested, adhere to the following rules:

• Before using the Meter, inspect the exterior casing. Do not use the Meter if it is damaged or if all or part of the exterior casing is removed. Look for cracks or missing plastic. Pay special attention to the insulation around the connectors.
• Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity.
• Pay special attention to the selections when measuring current and voltage. If you attempt to measure in the wrong setting, the multimeter will be easily burnt.
• Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding.
• The manual rotary switch should be placed in the correct position before measurement and should NOT be moved during measurement to prevent damage to the Meter.
• When the Meter is working at an effective voltage over 60V in DC or 30V rms in AC, special care should be taken because there is a danger of electric shock.
• Use the proper terminals, function, and range for your measurements.
• Do not use or store the Meter in a high-temperature environment, do not expose to high levels of humidity, or near strong magnetic fields.
• The performance of the Meter may deteriorate after dampening.
• When using the test leads, keep your fingers behind the finger guards.
• Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes
• Remove the connection between the testing leads and the circuit being tested. Turn the Meter power off before opening the Meter case.
• When servicing the Meter, use only the same model number or identical electrical specifications replacement parts.
• The internal circuit of the Meter shall not be altered to avoid damage of the Meter and any accident.
• Clean using a soft cloth and mild detergent for the surface of the Meter.
• Do not use abrasive materials or solvents to prevent the surface of the Meter from corrosion and damage.
• Turn the Meter off when not in use and take out the battery when it is not going to be used for an extended period of time. Regularly check the battery as it may leak when it has not been used for some time.
• Replace the battery as soon as leaking appears. A leaking battery will damage the Meter.
• Do not move the multimeter while measuring to avoid inaccurate readings.

ELECTRICAL SYMBOLS

DIMENSIONS

MULTIMETER DIAGRAM

1. Select Button
2. Hold / Backlight Button
3. Current Test Setting
4. Non-Contact Voltage (NCV) Setting
5. Battery Test Setting
6. Rotary Switch
7. OFF
8. Voltage Test Setting
9. Resistance/Continuity/Diode Test Setting
10. Capacitance Test Setting
11. LCD Screen
12. 10A Terminal
13. COM Terminal
14. Input Terminal
15. Test Leads
16. Alligator Clips

GETTING TO KNOW YOUR DEVICE

Select Button

• Use the rotary switch to select a function. Use the Select Button to further select the function if there are multiple functions in one rotary setting. Example: Switching between AC and DC voltage tests; Choosing between diode, resistance, and continuity tests.

NOTE: Pay special attention to the selected setting before performing any tests.

Hold / Backlight Button

• Press this button while performing a test to hold (freeze) the reading for easy recording. The screen will display when the hold function is activated.
• Press the button again to cancel the data hold.
• Press and hold this button to turn the backlight on. Repeat to turn the backlight off.

10A Jack

• Plug the red test lead into this terminal for currents between 400mA and 10A.

COM Jack

• Plug the black test lead into this terminal.

INPUT Jack

• Plug the red test lead into this terminal when current is greater than or equal to 4A.

Auto Shut Off

• After 15 of standby, the Meter will automatically turn off. To turn it on again, just rotate the range switch or press a button.
• Cancel the auto-off function by pressing the “Select” button while the device is powered on. The symbol will disappear from the LCD screen.

Replacing Batteries

• If the low battery sign appears on the LCD display, the battery should be replaced. Remove the rubber cover and screws on the back cover, replace the exhausted battery with fresh batteries. (Size AAA, 1.5V x3)

NOTE: Replace batteries immediately to prevent inaccurate readings due to low power. This also prevents potential safety hazards.

Replacing Fuses

Fuses rarely need to be replaced and are usually blown due to operator error. To replace the fuses:

1. Disconnect the test leads.
2. Remove the rubber sleeve and screws on the back cover of the Meter.
3. Open the back of the Meter and replace with fuses of the same rating.
   • Fuse 1: 500mA / 600V, FAST
   • Fuse 2: 10A / 600V, FAST

HOW TO USE THIS MULTIMETER

• The Digital Multimeter is very sensitive. It will be affected by nearby magnetic fields. Without touching any objects, there may be a reading jumping on the screen when it is turned on. This is a normal occurrence of a digital multimeter and does not affect performance.
• For continuity test: When the resistance is between 50Ω and 1000Ω, the buzzer may sound or may not sound. When the resistance is more than 1000Ω, the buzzer will not sound.

VOLTAGE TESTING

AC Voltage Test

1. Insert the red test lead into the “Input” jack and the black test lead into the “COM” jack.

2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.

3. Turn the rotary dial to the Voltage test setting.
   NOTE: The Meter defaults to DC Voltage. Use the “Select” button to reach the AC Voltage test. “AC” will be displayed on the screen.

4. Connect the two test leads to the neutral and live wires respectively (red to live, black to neutral).

5. After the reading stabilizes, record the reading from the LCD screen.

6. Turn the rotary switch to the OFF position to turn off the Meter.

DC Voltage Test

1. Insert the red test lead into the “Input” jack and the black test lead into the “COM” jack.

2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.

3. Turn the rotary dial to the Voltage test setting.
   NOTE: Check to ensure the Voltage test is set to DC. If it is in AC by mistake, use the “Select” button to change the setting to DC.

4. Connect the red test lead to the positive electrode and the black test lead to the negative electrode.

5. After the reading stabilizes, record the reading from the LCD screen.
   NOTE: If the result is negative, it means the test leads are connected inversely. To achieve a positive result, reconnect the test leads to the correct electrodes.

6. Turn the rotary switch to the OFF position to turn off the Meter.

VOLTAGE TIPS

How to find a live wire in a socket:

1. Switch to the voltage test setting.
2. Connect the black test lead to the grounded wire or jack. Connect the red test lead to one of the jacks to be measured.
3. Check both jacks. One should have a reading and the other should remain at or near zero. The live wire will have the reading.

VOLTAGE NOTES

• To avoid damage to the meter, do not measure voltage exceeding 600V DC or 600V AC CATIII.
• Pay special attention to the voltage setting of the Multimeter. The LCD screen will indicate whether the setting is in AC. Use the “Select” button to choose the correct setting.
• If the AC setting is used to measure DC and vice-versa, an overflow symbol will be displayed. Performing this has the potential to damage the Meter or any components you are attempting to test.
• When measuring voltage, the result will fluctuate depending on the power supply. Generally speaking, the result will fluctuate 10V, which is NOT an inaccurate result.

BATTERY TESTING

1. Insert the red test lead into the “Input” (red) jack and the black test lead into the “COM” (black) jack.
2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.
3. Rotary Dial to select the Battery Test Setting of the battery you wish to test (1.5V, 9V, 12V).
4. Connect the red test lead to the positive electrode and the black test lead to the negative electrode.
5. After the reading is stable, get the reading from the LCD screen.

BATTERY TEST TIPS

How to tell if a car battery is aging:

1. Set the Multimeter to the appropriate Battery Test setting.
2. Connect the test leads to the positive and negative terminals of the battery.
3. Start the car and turn on the air conditioner in the car. Check the voltage indication.
4. If the voltage drops severely, the battery is aging. If the battery voltage is significantly lower than 12V during this test, it means the car battery needs to be replaced.

How to tell if a common battery has power:

1. Measure the battery voltage
2. If it is greater than or equal to the voltage marked on the battery, it has normal power. If the measured voltage is lower than the voltage marked, it means the battery is aging or needs to be changed.
3. If the measured value is 0, it means the battery has a large internal resistance or the better is broken.

NOTE: Do not directly test the battery with the Current or Resistance Settings.

CONTINUITY TEST

1. Deenergize the circuit you will be testing.
2. Insert the red test lead into Insert the red test lead into the “Input” (red) jack and the black test lead into the “COM” (black) jack.
3. Tum on the Multimeter by setting it to “Continuity Test. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.
4. Place the test leads on both sides of the object to be measured. If the line is connected, the built-in buzzer will sound and the value will be displayed on the LCD screen. If there is no continuity, the buzzer will not sound and “OL” will be displayed on the screen, indicating infinite resistance.

MEASURING CURRENT

Measuring DC Current

1. Disconnect the circuit to be tested.
2. If the current to be measured is less than 400mA, insert the red test lead into the “Input” jack. If the current is between 400mA and 10A, insert the red test lead into the “10A” jack.
3. Set the function switch to the appropriate range (MA, mA, or A). If you do not know the measured value, set the function switch to the highest range, and reduce it range by range until a satisfactory resolution is obtained.
4. The default Current setting is DC, so there is no need to switch the “Select” button.
5. Connect the red and black test leads in series to the circuit.
6. Turn on the power and read the measurement result from the LCD display.

NOTE: If “OL” is displayed, it is out of range. Select a higher measurement range.

Measuring AC Current

1. Disconnect the circuit to be tested.
2. If the current to be measured is less than 400mA, insert the red test lead into the “Input” jack. If the current is between 400mA and 10A, insert the red test lead into the “10A” jack.
3. Set the function switch to the appropriate range (µA, mA or A). If you do not know the measured value, set the function switch to the highest range, and reduce it range by range until a satisfactory resolution is obtained.
4. Use the “Select” button to adjust the Current setting to AC. It will be displayed on the screen when the AC setting is reached.
5. Connect the red and black test leads in series to the circuit.
6. Turn on the power and read the measurement result from the LCD display.

NOTE: If “OL” is displayed, it is out of range. Select a higher measurement range.

Automotive Parasitic Battery Drain

1. Check if the battery voltage and power generation are within normal range. The battery voltage is generally around 12.7V and the power generation is around 14V.
2. Turn off all electrical accessories inside and outside the car and close the doors.
3. Remove the negative electrode of the battery. Set the Multimeter to the maximum current level and connect the Meter in series to the battery. Connect the red test lead to the negative line and the black test lead to the battery terminal.
4. Adjust the Meter, if necessary, to a lower range.
5. Wait for about 30 minutes; after all the modules of the vehicle enter the sleep state, read the accurate static discharge current. The discharge current is generally 0.02A (20mA), however, this can vary depending on the vehicle. Generally, it is normal to not exceed 50mA.
6. If the drain is larger than 50mA, begin checking fuses individually for which circuit is carrying the excess load. If a removed fuse reduces the battery draw to below 50mA, it can be determined the corresponding circuit is drawing the excess discharge.

Current Notes

• If you insert the red test lead into the 10A jack, be sure to insert the test lead back into the “Input” jack after the test to avoid forgetting to switch the jack for the next operation and burn the Multimeter.
• When testing a high current, for safety reasons, each measurement time should be less than 10 seconds, and the interval time between tests should be greater than 15 minutes.
• When testing the current, there must be a load in the circuit. Do not connect the multimeter in series with the circuit without a load to measure; doing so can potentially damage the Meter.
• Do not apply a current exceeding the Meter’s range to avoid damaging the Meter.

Measuring Resistance

1. Insert the red test lead into the “Input” jack and the black test lead into the “COM” jack.
2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.
3. Use the “Select” button to enter the Resistance setting.
4. Place the test leads at both ends of the resistance to be measured and maintain strong contact.
5. The results from the LCD display.
6. If the measured value is equal to the nominal resistance of the resistor or within the range of error, the resistor is functioning correctly.
   • If there is a large deviation between the nominal resistance and the measured resistance, the resistor is bad.
   • If the measured resistance is infinite (open circuit), zero (short circuit), or unstable, it means the resistor is damaged and can no longer be used.

Resistance Notes

• Do not change the resistance while taking a measurement. Doing so may damage the Meter and affect the test results.
• Do not test parallel circuits. The accuracy of the measurement will be affected, and the results may not be accurate.
• Do not directly measure the internal resistance of micrometers, galvanometers, batteries, and other instruments.

MEASURING CAPACITANCE

1. Insert the red test lead into the “Input” jack and the black test lead into the “COM” jack.
2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.
3. the function switch to Capacitance setting.
4. Make a strong connection between the test leads and both ends of the capacitor.
5. Measurement results will be displayed on the LCD display.

CAPACITANCE TIPS

If the measured value is significantly different from the value marked on the capacitor, the capacitor is damaged

CAPACITANCE NOTES

1. Before measuring the capacitor, discharge the capacitor to avoid damage to the Meter. Do so by connecting the capacitor to a high-powered resistor.
2. Discharge the capacitor after measurement to avoid any potential safety hazards.
3. If the capacitance is large, it may take a long time for the reading to stabilize.

DIODE TEST

1. Insert the red test lead into the “Input” jack and the black test lead into the “COM” jack.

2. Turn on the Multimeter by setting it to “Continuity Test”. Touch the test lead tips together to check if they are connected normally. An audible sound should occur.

3. Use the “Select” button to enter the Diode setting.

4. Connect the red test lead to the positive end of the diode and the black test lead to the negative end.
   NOTE: Generally, the positive end of the diode is the longer end.

5. Results will be displayed on the LCD screen.

6. If there is no reading, switch the test leads to the opposite ends of the diode and measure again.

DIODE TEST TIPS

Is the diode functioning correctly:

• If the red test lead is connected to the positive pole of the diode and the black lead is connected to negative, then the diode should be in a forward conduction state, and the displayed value is the forward voltage drop.
• Normal diode forward pressure drop: the general silicon tube is 0.5- 0.7 V, germanium tube is 0.15-0.3V.
• If “000 “is displayed, the diode is broken.
• You can also verify that the red test lead is connected to the negative pole of the tested diode and the black test rod is connected to the positive pole. The diode should display “OL”.

Polarity Judgment Method

1. Switch the Multimeter to the Resistance setting
2. Connect the two test leads to the two electrodes of the diode.
3. Measure one result, then swap the positions of the test leads, then measure the second result.
4. The larger result is the reverse resistance and the smaller result is the forward resistance. The smaller resistance is when the black testlead is connected to the positive end of the diode and the red lead is connected to the negative end.

NON-CONTACT VOLTAGE (NCV)

The NCV function detects AC voltage without the use of test leads.

1. Set the Rotary Dial to the NCV function.
2. The symbol “EF” indicating the electric field strength is displayed on the LCD.
3. Use the top of the Meter to detect objects. If the AC voltage is 30-1000V, the Meter will continuously make sound.

NCV NOTE: This function does not affect the Meter’s measurement after exiting the setting. If the range switch is not in the NCV position, the Meter will operate normally.

TROUBLESHOOTING

the contact between test leads and object being measured
- Check the connection between the test leads and the Meter
Reading is not accurate| – Check the test leads for damage
- Check if the battery needs to be replaced
A certain range is not available| – Adjust the contact point of the transfer switch
- The variable value of shunt resistance needs to be adjusted or replaced
Range error is large| As above (same solutions as “A certain range is not available”)
No reading| – Check whether the fuse is intact
- Check the test leads for damage

DC VOLTAGE (AUTO-RANGING)

• Input Impedance: 10MQ
• Overload Protection: 600V DC or 600AC rms (400mV range: 250V DC/AC rms)
• Max. Input voltage:  600V DC

SPECIFICATIONS

Accuracy is guaranteed for 1 year when stored at 73°F $9°F

AC VOLTAGE (AUTO RANGING)

• Input Impedance: 10MO
• Frequency Range: 40Hz ~ 400Hz
• Overload Protection: 600V DC or 600AC rms
• Response: Average, calibrated in rms of sine wave
• Max. Input voltage: 600V AC rm

AC CURRENT

• Overload Protection: yA and mA ranges: F0.5A/600V fuse
  • 4A and 10A ranges: F10A/600V fuse
• Max. Input Current: “INPUT” jack: 400mA
  • “A” jack: 10A (For measurements>5A: duration <10 seconds, interval >15 minutes)
• Frequency Range: 40Hz ~ 400Hz
• Response: Average, calibrated in rms of sine wave

DC CURRENT

• Overload Protection: MA and mA ranges: F0.5A/600V fuse
  • 10A ranges: F10A/600V fuse
• Max. Input Current: “INPUT” jack: 400mA
  • “A” jack: 10A

(For measurements>5A: duration <10 seconds, interval >15 minutes)

DIODE AND CONTINUITY

voltage: about 1.5V
Continuity| The built-in buzzer will sound if the resistance is less than about 500Ω| Open circuit voltage: about 0.5V; Buzzer may not sound if resistance is between 500Ω and 1000Ω, and will not sound if resistance is more than 1000Ω

• Overload Protection: 250V DC/AC rms
• For continuity test: When the resistance is between 500 and 1000, the buzzer may sound or may not sound. When the resistance is more than 1000, the buzzer will not sound.

RESISTANCE (AUTO RANGING)

• Open Circuit Voltage: about 0.25V
• Overload Protection: 250V DC/AC rms

CAPACITANCE

BATTERY TESTING

Overload Protection: 1.5V and 9V 12V ranges: F0.5A/600V fuse The approx. voltage of the battery is show on the LCD.

NOTE: The battery voltage cannot measure over 48V. Because the Meter’s internal resistance is very small, the high voltage will burn the meter.

INCLUDED IN BOX

• 1 x Owners Manual
• 1 x Pair of Test Leads
• 1 x pair of Alligator Clips
• 1 x AstroAI 4000 Counts Multimeter

WARRANTY

3 Year Warranty Limited Warranty From AstroAl

• Each AstroAl Digital Multimeter will be free from defects in material and workmanship. This warranty does not cover fuses, disposable batteries and damage from neglect, misuse, contamination, alteration, accident, or abnormal conditions of operation or handling, including overvoltage failures caused by use outside the Multimeter’s specified rating, or normal wear and tear of mechanical components. This warranty covers the original purchaser only and is not transferable.
• If this product is defective, please contact AstroAl Customer Support at support@astroai.com.

FREQUENTLY ASKED QUESTIONS

What distinguishes the AstroAI DM130B Digital Multimeter from other models?

The AstroAI DM130B Digital Multimeter stands out for its compact design, ease of use, and affordability, making it an ideal choice for both professionals and DIY enthusiasts.

What is the minimum operating voltage required for the AstroAI DM130B Digital Multimeter?

The AstroAI DM130B Digital Multimeter has a minimum operating voltage requirement of 1.5 volts, ensuring versatility in various electrical testing scenarios.

What are the dimensions and weight of the AstroAI DM130B Digital Multimeter?

The AstroAI DM130B Digital Multimeter measures 6.3 x 4.53 x 1.57 inches and weighs 10.23 ounces, providing a portable and lightweight solution for electrical measurements on the go.

What is the model number of the AstroAI DM130B Digital Multimeter?

The model number of the AstroAI DM130B Digital Multimeter is DM130B, facilitating easy identification and compatibility with accessories and replacement parts.

How is the AstroAI DM130B Digital Multimeter powered?

The AstroAI DM130B Digital Multimeter operates using three AAA batteries, offering convenient power options for extended use in various environments.

What is the warranty coverage for the AstroAI DM130B Digital Multimeter?

The AstroAI DM130B Digital Multimeter comes with an impressive 3-year warranty, providing users with peace of mind regarding its quality and longevity.

What types of measurements can be performed with the AstroAI DM130B Digital Multimeter?

The AstroAI DM130B Digital Multimeter is capable of measuring a wide range of electrical parameters, including voltage, current, resistance, continuity, and diode testing, catering to diverse testing needs.

What special features does the AstroAI DM130B Digital Multimeter offer?

The AstroAI DM130B Digital Multimeter may include features such as auto- ranging, data hold function, backlit LCD display, and protective rubber corner guards, enhancing usability and durability in various environments.

What is the price of the AstroAI DM130B Digital Multimeter?

The AstroAI DM130B Digital Multimeter is priced at $18.99, offering excellent value for money without compromising on quality or functionality.

Why is my AstroAI DM130B Digital Multimeter not powering on?

If your AstroAI DM130B Digital Multimeter is not powering on, first ensure that the batteries are inserted correctly and are not depleted. Try replacing the batteries with fresh ones and check if the meter powers on.

How can I troubleshoot inaccurate readings on my AstroAI DM130B Digital Multimeter?

Inaccurate readings on the AstroAI DM130B Digital Multimeter may result from improper calibration or a damaged probe.

What should I do if the display screen of my AstroAI DM130B Digital Multimeter is not clear or shows gibberish characters?

If the display screen of your AstroAI DM130B Digital Multimeter is unclear or shows gibberish characters, check for any visible damage to the screen or connections. If the issue persists, contact AstroAI customer support for assistance or warranty service.

How can I troubleshoot difficulty in selecting measurement modes on my AstroAI DM130B Digital Multimeter?

Difficulty in selecting measurement modes on the AstroAI DM130B Digital Multimeter may be due to a faulty selector switch or debris obstructing its movement. Clean the selector switch and try again.

What should I do if the AstroAI DM130B Digital Multimeter does not respond when I press the buttons?

If the AstroAI DM130B Digital Multimeter does not respond to button presses, check for any debris or obstruction around the buttons. Clean the surface of the meter and buttons, and try pressing the buttons again.

How can I troubleshoot intermittent or flickering readings on my AstroAI DM130B Digital Multimeter?

Intermittent or flickering readings on the AstroAI DM130B Digital Multimeter may indicate a loose connection or poor contact. Check the connections between the meter and the test leads, ensuring they are secure and free from damage.

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REFERENCES

AstroAI DM130B Digital Multimeter Owner’s Manual- Device.Report

AstroAI DM130B Digital Multimeter Owner’s Manual- wiki

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