AstroAI RMS 4000 Count Digital Multimeter
User Manual

AstroAI RMS 4000 Count Digital Multimeter User Manual

Thank you for purchasing the True RMS 4000 Count Digital Multimeter from AstroAI. This DMM is battery-powered, equipped with a 4000-count display and automatic ranging.
This instrument performs AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Diode Testing, Continuity Testing, NCV Detection, Live Wire Detection, and Battery Voltage Testing. Thank you again for choosing AstroAI, if you have any questions or concerns regarding your product, please contact us at [email protected].

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.
  • 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.
  • 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, damage can occur to the Meter.
  • Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and grounding.
  • 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.
  • 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, and 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

AstroAI RMS 4000 Count Digital Multimeter User Manual - Electrical Symbols

INCLUDED IN BOX

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

DIMENSIONS

AstroAI RMS 4000 Count Digital Multimeter User Manual - Dimensions

MULTIMETER DIAGRAM

AstroAI RMS 4000 Count Digital Multimeter User Manual - Multimeter Diagram

  1. FUNG Button
  2. Hold Button
  3. MAX Button
  4. Backlight Button / Flashlight Button
  5. Rotary Switch
  6. 10A Terminal
  7. COM Terminal
  8. Input Terminal
  9. NCV Detector
  10. Flashlight
  11. Indicator Light
  12. LCD Screen
  13. Test Leads

GETTING TO KNOW YOUR DEVICE

BUTTONS FUNCTIONS

AstroAI RMS 4000 Count Digital Multimeter User Manual - Getting to know your device AstroAI RMS 4000 Count Digital Multimeter User Manual - Getting to know your device

SETTING FUNCTIONS

AstroAI RMS 4000 Count Digital Multimeter User Manual - Setting Functions AstroAI RMS 4000 Count Digital Multimeter User Manual - Setting Functions

LEAD TERMINALS

AstroAI RMS 4000 Count Digital Multimeter User Manual - Lead Terminals

OTHER FUNCTIONS AND FEATURES

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.
  • Remove Auto Off: When the multimeter is off, press and hold the “FUNG” button, and then turn the rotary dial until the meter beeps. The “APO” icon on the screen will
    disappear, which means the auto shut off function is cancelled. It will be restored again after restarting.

Replacing Batteries:

  • If the low battery sign appears on the LCD display, the battery should be replaced. Remove the rubber cover and the screws on the back cover, replace the exhausted battery with fresh batteries. (Size AAA, 1.5V x2).
  • NOTE: Replace batteries immediately to prevent inaccurate readings due to the 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:

  • Disconnect the test leads.
  • Remove the rubber sleeve and the screws on the back cover of the Meter.
  • Open the back of the Meter and replace with fuses of the same rating.

It is crucial that the replacement fuses have the same rating:

  • Fuse 1: F400mA/250V fuse,5mmX20mm.
  • Fuse 2: F10A/250V fuse,5mmX20mm.

HOW TO USE THIS MULTIMETER

This 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 it does not affect the measurement results.

I. MEASURING VOLTAGE:

  • Insert the red test lead into the “Input” (red) terminal and the black test lead into the “COM” {black) terminal.
    AstroAI RMS 4000 Count Digital Multimeter User Manual - Insert the red test lead into the input
  • Turn the rotary dial to the” V’-‘ “setting. When the voltage is below 400mV, turn the dial to the “mV’-‘ “setting. Press the “FUNG” button to switch between AC/DC. The screen will indicate “DC” when in the DC setting and “AC” when in the AC setting.

AstroAI RMS 4000 Count Digital Multimeter User Manual - Turn the rotary dial

  • Connect the two test leads to the neutral and live wires respectively (red to live, black to neutral).
  • After the reading stabilizes, record the reading from the LCD screen.
  • Turn the rotary switch to the OFF position to turn off the Meter.

VOLTAGE NOTES:

  • To avoid damage to the meter, do not measure voltage exceeding 600V DC or 600V AC.
  • Pay special attention to the voltage setting of the Multimeter. The LCD screen will indicate whether the setting is in AC. Use the “FUNG” button to choose the correct setting.
  • If the AC setting is used to measure DC and vice-versa, there is potential to damage the Meter or any components you are attempting to test.

ll. MEASURING RESISTANCE:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Measuring Resistance

  • Place the test leads at both ends of the resistance to be measured and maintain a strong contact.
  • The results will be displayed on the LCD screen.
  • 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.

Ill. MEASURING CAPACITANCE:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Measuring Capacitance

  • Create a strong connection between the test leads and both ends of the capacitor.
  • Measurement results will be displayed on the LCD screen.

IV. CONTINUITY TEST:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Continuity Test AstroAI RMS 4000 Count Digital Multimeter User Manual - Continuity Test

CONTINUITY NOTES:

  • The audible “beep” sound indicates the resistance value of the circuit under test is less than 300.
  • Overload Protection: 250V.

V. DIODE TEST:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Diode Test AstroAI RMS 4000 Count Digital Multimeter User Manual - Diode Test

DIODE TEST TIPS:
Normal Diode Function:

  • 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: general silicon tubes are 0.5-0. 7V, germanium tubes are 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 lead is connected to the positive pole if the reading displays “OL”.

POLARITY JUDGMENT METHOD:

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

VI. BATTERY TEST:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Battery Test AstroAI RMS 4000 Count Digital Multimeter User Manual - Battery Test

  • Connect the red test lead to the positive electrode and the black test lead to the negative electrode.
  • After the reading is stable, get the reading from the LCD screen. If the battery voltage is low, the indicator light will turn red.

BATTERY TEST TIPS:
How to tell if a car battery is aging:

  • Set the Multimeter to the appropriate Battery Test setting.
  • Connect the test leads to the positive and negative terminals of the battery.
  • Start the car and turn on the air conditioner in the car. Check the voltage indication.
  • 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:

  • Set the Multimeter to the appropriate Battery Test setting.
  • 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.
  • If the measured value is 0, it means the battery has a large internal resistance or the battery is broken.
    NOTE: Do not directly test the battery with the Current or Resistance Settings.

VII. MEASURING CURRENT:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Measuring Current

  • Disconnect the power supply of the circuit under test. Connect the Meter to the circuit under test in series, and then turn on the power supply of the circuit.
  • The reading will be displayed on the LCD screen.

AUTOMOTIVE PARASITIC BATTERY DRAIN:

  • 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.
  • Turn off all electrical accessories inside and outside the car and close the doors.
  • 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.
  • Adjust the Meter, if necessary, to a lower range.
  • 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.
  • 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 1 0A 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 should not exceed 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.

VIII. NON-CONTACT VOLTAGE (NCV):

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

AstroAI RMS 4000 Count Digital Multimeter User Manual - NCV

  • Move the NCV detector close to the point to be tested.
  • When the Meter senses a weak AC signal, the green indicator light will turn on and the buzzer will emit a slow, audible beep.
  • When the Meter senses a strong AC signal, the red indicator light will turn on and the buzzer will emit a quick beep.
    NCV NOTE: This function does not affect the Meter’s measurement after exiting the NCV setting. If the range switch is not in the NCV position, the Meter will operate
    normally.

IX. LIVE WIRE DETECTION:

AstroAI RMS 4000 Count Digital Multimeter User Manual - Live Wire Detection

  • Touch the point to be measured with the tip of the red test lead.
  • When the Meter senses a weak AC signal, the green indicator light will turn on, and the buzzer will emit a slow, audible beep.
  • When the Meter senses a strong AC signal, the red indicator light will turn on, and the buzzer will emit a quick beep.

TROUBLESHOOTING

AstroAI RMS 4000 Count Digital Multimeter User Manual - Troubleshooting AstroAI RMS 4000 Count Digital Multimeter User Manual - Troubleshooting

DC VOLTAGE

AstroAI RMS 4000 Count Digital Multimeter User Manual - DC Voltage

  • Input Impedance: 10MQ
  • Overload Protection: 600V
  • Max. Input voltage: 600V

AC VOLTAGE

AstroAI RMS 4000 Count Digital Multimeter User Manual - AC Voltage

  • Input Impedance: 10MO
  • Overload Protection: 600V
  • Max. Input voltage: 600V
  • Frequency Range: 40Hz ~ 1 KHZ
  • Response: True RMS

DC CURRENT

AstroAI RMS 4000 Count Digital Multimeter User Manual - DC Current

AC CURRENT

AstroAI RMS 4000 Count Digital Multimeter User Manual - AC Current

RESISTANCE

AstroAI RMS 4000 Count Digital Multimeter User Manual - Resistance

CAPACITANCE

AstroAI RMS 4000 Count Digital Multimeter User Manual - Capacitance

BATTERY TEST

AstroAI RMS 4000 Count Digital Multimeter User Manual - Battery Test

3 YEAR WARRANTY LIMITED WARRANTY FROM ASTROAI

Each AstroAI 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 AstroAI Customer Support at [email protected].

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Web:www.astroai.com
E-mail:[email protected]

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