AstroAI DM2000 True RMS Digital Multimeter Tester User Manual

AstroAI DM2000 True RMS Digital Multimeter Tester

INTRODUCTION

• Thank you for purchasing the Auto Ranging 20000 Counts Digital Multimeter from AstroAI.
• The AstroAI True RMS Digital Multimeter is designed to be safely and accurately used in schools, laboratories, factories and other social/ industrial fields.
• This user manual provides all safety, operation, specification, and maintenance information for the meter.
• This instrument performs AC/DC Voltage, AC/DC Current, Resistance, Frequency, Duty Ratio, Temperature, Capacitance, NCV, Live Wire Testing, Diode Testing and Continuity Testing.
• Thank you again for choosing AstroAI, if you have any questions or concerns regarding your product, please contact us at support@astroai.com.
• Fully read and comprehend this manual before using this Digital Multimeter.

WARNING

• To avoid possible electric shocks or personal injury, and to avoid damaging the meter or the equipment being tested, adhere to the following rules:
• Use the meter strictly in accordance with this manual otherwise, the built-in protection provided by the meter may be damaged or weakened.
• Please be especially careful when measuring over 60 V DC, 30 V AC
• RMS or 42 V peak value, there is an increased danger of an electric shock in these ranges.
• Do not apply more than the rated voltage, as marked on the meter, between the terminals or between any terminal and grounding.
• Check whether the meter is working normally by measuring a known voltage, do not use it if the readings are incorrect or if the meter is damaged.
• Before using the meter, please check if there are cracks or any damage to the plastic parts of the meter’s casing. Do not use the meter if any part of the exterior casing is damaged.
• Before using the meter, please check whether the test leads are cracked or damaged. If damaged, please replace them with test leads of the same model and electrical specifications.
• Use the meter according to the measurement category, voltage or current rating specified on the meter or manual.
• Comply with local and national safety regulations. Wear personal protective equipment (such as approved rubber gloves, masks, flame-resistant clothing, etc.) to prevent injury from electric shocks and arcs when hazardous live conductors are exposed.
• To avoid measurement errors, replace the battery as soon as the low-battery indicator appears.
• Do not use the meter around explosive gas, steam, or in humid environments.
• When using the test leads, keep your fingers behind the finger guards.
• When measuring, connect the neutral wire or ground wire first, then connect the live wire. When disconnecting, disconnect the live wire first, and then disconnect the neutral wire and ground wire.
• Before opening the case or battery cover, remove the test leads from the meter first. Do not use the meter while it is disassembled or when the battery cover is opened.
• To ensure your safety, the meter can only be used with the equipped test leads. If the test leads are damaged and need to be replaced, only replace them with the same model and electrical specifications.

PACKAGE INCLUDES

• User Manual x 1
• Pair of Test Leads x 1
• K-Type Thermocouple x 1
• Storage Bag x 1
• AstroAI Digital Multimeter x 1

ELECTRICAL SYMBOLS

• High Voltage
• Direct Current
• AC Current/DC Current
• Capacitance
• Fuse
• Continuity Test
• Diode Test
• Warning
• Alternating Current
• Data Hold
• Resistance Test
• Earth Ground
• Double Insulation
• Low Voltage
• Compliant with EU Standards

DIMENSIONS

• Length: 7.48 inches (18.8 cm)
• Width: 3.46 inches (8.8 cm)
• Height: 2.28 inches (5.8 cm)

DIAGRAM

1. NCV Detector
2. Red/Green Indicator
3. Screen
4. FUNC Button
5. Rotary Switch
6. 10 A Current Terminal
7. mA, μA Terminal
8. Flashlight
9. Other Input Terminal
10. COM Terminal
11. Storage Bag
12. Test Leads
13. K-Type Thermocouple

BUTTON FUNCTIONS

• Data Hold
  • Press the “HOLD” Button to hold/cancel the data.
• FUNC Button
  • Use the “FUNC” Button to select a specific function if there are multiple functions in one rotary setting.
• MAX/MIN Button
  • Press the “MAX/MIN” Button to record the maximum and minimum readings alternately. Press and hold the button for 2 seconds to exit this function.
• Backlight/Flashlight Button
  • Backlight: Press this button to turn the backlight on/off.
  • Flashlight: Press and hold this button for 3 seconds to turn the flashlight on/off.

SETTING FUNCTIONS

Note: Use the “FUNC” Button to select a specific function if there are multiple functions in one rotary setting.

• DC Voltage Test: 0-1000 V; AC Voltage Test: 0-750 V
• AC/DC Voltage Test: 0-200 mV
• Hz Frequency
• % Duty Ratio
• Resistance Test: 0.01 0-100 MO
• Capacitance Test: 0.000 1 nF-20 mF
• Continuity Test
• DiodeTest
• Degree Fahrenheit
• Degree Celsius
• AC/DC Current Test: 0~2000 uA
• AC/DC Current Test: 0-200 mA
• Current Test: O~ 10 A
• NCV Detection
• Live Wire Detection

OTHER FUNCTIONS

• Auto Shutoff
  • After 15 minutes without user input, the meter will automatically turn off to save energy. Press any button to turn it on.
  • Press the “”FUNC”” Button and turn on the meter; it will emit a harsh beep sound to indicate the exit of the auto-shutoff function. Restart the meter to activate the auto-shutoff function.
• INPUT Indicator
  • The indicator light on the INPUT terminal will flash when the meter is powered on or the function is selected.
• High-Voltage Indicator
  • The screen will display an orange backlight to warn users when the measuring voltage exceeds 80 V, or the measuring current exceeds 1 A.
• Low-Voltage Indicator
  • The screen will display the” ” symbol when the battery voltage is insufficient.
• AC Frequency Display
  • The screen will display the frequency of the voltage/current when testing the AC voltage/current.

PREPARATION

Continuity Test

1. Turn the rotary dial to the “” ‘” setting and press the “ FUNC ” Button to choose the continuity function. The screen will display the” ” symbol.
2. Insert the red test lead into the “ ” terminal, and the black test lead into the “COM” terminal.
3. Touch the red and black test leads together to check whether they are functioning normally. The buzzer will beep if the test leads are normal.

INSTRUCTIONS

Warning

• Do not measure if the voltage exceeds 750 V AC or 1000 V DC. Failure to do so may damage the meter.
• Pay special attention to safety when measuring high voltages to avoid electric shock or other personal injuries.
• Before using the meter, test a known voltage or current with it to confirm that the meter works properly.

DC/ AC Voltage Measurement

1. Turn the rotary dial to the “ ” setting. Turn the rotary dial to the “ ” setting if the target voltage is lower than 200 mV. Press the “FUNC” Button to choose between the AC/DC voltage function. The screen will display “DC” when testing DC voltage and “AC” when testing AC voltage.
2. Insert the red test lead into the” ” terminal, and the black test lead into the “COM” terminal.
3. Connect the test leads to the circuit being tested (in parallel).
4. Record the stabilized reading from the screen. The .. _.. symbol will display on the screen if the red test lead connects to the negative polarity.
5. The frequency will display on the screen when measuring AC voltage.
   • Note: The screen will light up in orange when the measuring voltage exceeds 80 V.

Frequency/Duty Ratio

1. Turn the rotary dial to the “Hz%” setting (or test the frequency in the AC voltage/current setting.)
2. Insert the red test lead into the “ ” terminal, and the black test lead into the “COM” terminal.
3. Connect the test leads to the circuit being tested (in parallel), to test the frequency/ duty ratio.
4. Both the frequency and duty ratio will be displayed on the screen.

AC/DC Current Measurement

1. Turn the rotary switch to the , setting based on the estimated current value and press the “FUNC” Button to choose between AC/DC current. The screen will display “QC” when testing the DC voltage and “AC” when testing the AC voltage.
2. In the settings, connect the red test lead to the” ” terminal and the black test lead to the “COM” terminal. In the” ” setting, connect the red test lead to the “10 A” terminal and the black test lead to the “COM” terminal.
3. Power off the circuit being tested and connect the meter to the circuit in parallel. Then, power on the circuit.
4. Record the stabilized reading on the screen.
   • Note: The screen will light up in orange when the testing current exceeds 1A.

Resistance Measurement

1. Turn the rotary dial to the “ ” setting and press the “FUNC” Button to choose the resistance function. Ensure the circuit being tested has been powered off.
2. Insert the red test lead into the” ” terminal, and the black test lead into the “COM” terminal.
3. Connect the test leads to the circuit or the resistance to be tested.
4. Record the stabilized reading from the screen.

Capacitance Measurement

1. Turn the rotary dial to the” ” setting and power off the circuit.
2. Insert the red test lead into the “ ” terminal, and the black test lead into the “COM” terminal.
3. Connect the test leads to the capacitor to be tested.
4. Record the stabilized reading from the screen.

Continuity Measurement

1. Turn the rotary dial to the” ” setting. Press the “FUNC” button to choose the continuity function and power off the circuit.
2. Insert the red test lead into the “ ” terminal, and the black test lead into the “COM” terminal.
3. Connect the test leads to the circuit or the resistance to be tested.
4. If the resistance of the resistor/load is <30 0, the LEO light will illuminate green and the buzzer will beep. If the resistance is between 30 0-60 0, the screen will display the resistance value.

Diode Measurement

1. Turn the rotary dial to the” “ “setting. Press the “FUNC” Button to choose the diode function; then power off the circuit being tested.
2. Insert the red test lead into the “ ” terminal and the black test lead into the “COM” terminal.
3. Use the red test lead to touch the positive polarity of the diode and the black test lead to touch the negative polarity of the diode.
4. Record the stabilized reading from the screen.
5. If the test leads are connected reversely, the “OL.:’ symbol will be displayed on the LCD screen. This can be used to help distinguish the anode and cathode.

NCV Detection

1. Turn the rotary dial to the “ ” setting and press the “FUNC” Button to choose the NCV function, the screen will display the “NCV” symbol.
2. Move the NCV detector close to the point to be tested.
3. When the meter senses a weak AC signal, the green indicator light will turn on and the buzzer will emit a slow, audible beep.
4. When the meter senses a strong AC signal, the red indicator light will turn on and the buzzer will emit a rapid beep.

Live Wire Detection

1. Turn the rotary dial to the setting and press the “FUNC” Button to choose the LIVE function, the screen will display the “Live” symbol.
2. Insert the red test lead into the “ ” terminal, and touch the point to be measured with the tip of the red test lead.
3. When the meter senses a strong AC signal, the red indicator will turn on, the “LIVE” symbol will display on the orange screen and the buzzer will emit a rapid beep.

Temperature Measurement

1. Turn the rotary dial to the” / ” setting.
2. Insert the positive polarity (red) of the K-type thermocouple into the terminal, and the negative polarity (black) into the COM terminal.
3. Touch the end of the K-type thermocouple to the object being measured. Record the result on the screen.
4. The screen will display Fahrenheit and Celsius degrees.

Note:

• The cold junction of the K-type thermocouple takes time to reach thermal equilibrium.
• Use the K-type thermocouple only.

Warning:

• When using the K-type thermocouple to test temperature, do not touch it with electric objects; doing so may damage the meter and cause an electric shock or personal injuries.

MAINTENANCE

Cleaning
If there is dust or humidity in the terminals, it may produce erroneous measurements. Please clean the meter as follows:

• Turn off the power to the meter and remove the test leads.
• Turn the meter over and shake out the dust accumulated in the input jack.
• Then, wipe the case with a damp cloth or mild detergent.
• Do not use abrasive materials or solutions.
• Wipe the contacts in each terminal with a clean cotton swab dampened in alcohol.

Warning: Please keep the interior of the meter clean and dry in case of electric shock or damage.
Replacing Battery

1. Turn off the meter and remove the test leads.
2. Unscrew the screws and open the back case.
3. Remove the old batteries and install the new batteries according to the polarity marks inside the battery compartment.
4. Fasten the battery cover and screws after installing the batteries.

Warning:

• Please replace the battery when the low battery symbol appears on the screen to avoid inaccurate readings and electric shocks or personal injuries.
• To ensure safe operation, please take the batteries out of the meter if it is going to be idle for a long time. Failure to do so may cause leaky batteries that damage the meter’s internals.

Replacing Fuses

1. Turn off the meter and remove the test leads.
2. Unscrew the screws and open the back case.
3. Remove the blown fuses, and replace them with fuses of the same specification. Ensure the fuses are installed well.
4. Fasten the cover and screws after installing the fuses. It is crucial that the replacement fuses have the same rating:
   • mA: F200 mA/250 V fuse, CD6x32 mm.
   • 1 OA: Fl O A/250 V fuse,CD6x32 mm.

Warning:

• To avoid electric shock, personal injuries, or damage to the meter, please use fuses with the same specifications.

SPECIFICATIONS

• Work Environment: CAT. IV 600 V; CAT. 1111000 V;
• Pollution Level: 2;
• Altitude <2000 m:
  • Work Temperature & Humidity: 0-40 °C(<80% RH, <10 °C Non-Condensing);
  • Storage Temperature & Humidity:-10-60 °C (<70% RH, Battery removed).
  • Temperature Coefficient: 0.1X Accuracy/°C (<18 °C Or >28 °C).
  • The Maximum Measurable Voltage of the Meter: DC 1000 V/AC 750 V.
• Fuse Ratings:
  • mA: F200 mA/250 V fuse,<D6x32 mm;
  • 1O A: F10 A/250 V fuse,<D6x32 mm.
• Sampling Speed: 3 Times/Second.
• Digital Display: Automatically display unit symbols based on the current settings.
• Overload Indication: “QI..’.’.
• Range Selection: Auto.
• Low Battery Indication: “a” displays when the battery voltage is lower than normal.
• Input Polarity Indication: the”-” symbol displays automatically.
• Power: 2×1 .5 V AA batteries.

DETAILED SPECIFICATIONS

Precision Index:

• The accuracy is consistent within one year of calibration.
• Ambient Temperature: 18 °C to 28 °C, Relative Humidity:,; 80%.
• Accuracy: ± (%rdg + dgts).

DC Voltage

AC Voltage

• Input Impedance: 10 MO.
• Frequency Range: 40 Hz – 1 kHz.
• Response: True RMS.
• Overload Protection: 1O DO V DC/750 V AC.

DC Current

• Overload Protection: “μA/mA”
• Input: F200 mA/250 V Fuse; “10 A”
• Input: F10 A/250 V Fuse.
• Maximum Measuring Current: “μA/m/,;’ Terminal Maximum Input: 200 mA; “10 A”
• Terminal Maximum Input: 10 A. Do not continuously test a current >1 A for more than 30 seconds. Allow the meter to cool down for 1 minute before resuming use.

AC Current

• Overload Protection: “μA/mA” Input: F200 mA/250 V Fuse;
• “A” Input: F10A/250V Fuse.
• Maximum Measuring Current: “μA/mA” Maximum Input 200 mA; Maximum Input “A”10 A.
• Frequency Range: 40 Hz-1 kHz; Response: True RMS. Do not continuously test a current >1 A for more than 30 seconds. Allow the meter to cool down for 1 minute before resuming use.

Resistance

• Overload Protection: 250 V.

Capacitance

• Overload Protection: 250 V.

Frequency/Duty Ratio

• Minimum Measuring Frequency: 5 Hz: Overload Protection: 250 V.
• Frequency in the “mV” Voltage Setting.
  • Measuring Range: 10 Hz- 100 kHz:
  • Signal Sensitivity: >10 mV RMS, Sine Wave.
• Frequency in the “V” Voltage Setting.
  • Measuring Range: 10 Hz – 20 kHz:
  • Signal Sensitivity: >0.5 V RMS, Sine Wave
• Frequency in the Current Setting.
  • Measuring Range: 10 Hz – 20 kHz;
  • Signal Sensitivity: “ μA” Setting: >100 μA RMS, Sine Wave;
  • “mA” Setting: >10 mA RMS, Sine Wave;
  • “A” Setting: >1A RMS, Sine Wave.

Temperature

The accuracy above does not include the error margin of the thermocouple’s tip.
Continuity Test

Diode Test

RECYCLING

• You may dispose of the product when its service life has ended, please recycle the recyclable parts according to local guidelines

WARRANTY PERIOD

3-year 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 support@astroai.com.
• Web: www.astroai.com.
• E-mail: support@astroai.com.

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