ASTROAI USER MANUAL

Introduction

Thank you for purchasing the True RMS 6000 Count Digital Multimeter from AstroAI. The AstroAI True RMS Digital Multimeter is designed to be safely and accurately used by professionals in a commercial setting or weekend DIYers who need more utility from their standard digital multimeter. 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, Diode, hFE, Frequency, Capacitance, and Temperature Testing. If you have any questions or concerns regarding your product, please contact AstroAI Customer Support at support@astroai.com.

Safety Precautions

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

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.
• 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 or hFE.
• Replace the battery ? as soon as the battery indicator appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury.
• Remove the connection between the testing leads and the circuit being tested, and 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 at will to avoid damage of the Meter and any accident.

Care and Maintenance

• 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.

Electrical Symbols

Specifications Overview

Multimeter Diagram

The multimeter features the following components:

• 1. Magnetic Hanger: For convenient attachment.
• 2. LCD Screen: Displays readings and status.
• 3. Function Buttons: Select, Range, Relative, Hz/Duty, Max/Min.
• 4. Rotary Function Switch: Selects measurement modes (OFF, V~, V---, Ω, •))), ➡️|--, hFE, °C/°F, A~, A---).
• 5. 10A Terminal: For high current measurements (up to 10A).
• 6. μA/mA Terminal: For microampere and milliampere measurements.
• 7. COM Terminal: Common (negative) input terminal.
• 8. INPUT Terminal: Positive input terminal for most measurements.
• 9. Silicone Sleeve: Protective outer casing.
• 10. Multi-Function Socket: For specialized measurements like Capacitors and Transistors.

LCD Screen Diagram

The LCD screen displays various indicators and readings:

Getting to Know Your Device

Buttons and Functions

• Select Button: Used to further select functions within multifunction settings, such as temperature or specific test modes.
• [Hold/Backlight Button]: Press once to hold the current measurement data for easier recording; press again to remove the hold function. Press and hold this button to turn on the LCD backlight.
• Max/Min Button: When taking a measurement, press once to enter "Max Mode" (captures the highest reading). Press again to enter "Min Mode" (captures the lowest reading). Press and hold to exit Max/Min Modes.
• Range Button: For AC/DC Voltage, AC Current, and Resistance measurements. The meter defaults to Auto Range. Press repeatedly to select a manual range. Press and hold to return to Auto Ranging. Beware of selecting a range too low, as it will result in an Overload (OL) indication.
• Relative Button: Press to activate relative mode for more accurate readings, often by nullifying test lead resistance. A small triangle (delta symbol Δ) will appear on the display, and the reading will be set to zero. Press again to exit relative mode.
• Hz/Duty Button: When using the Hz/Duty Cycle function, press this button to switch between measuring frequency (Hz) and duty cycle. It can also be used to switch to measuring Hz while performing other functions like Voltage measurement.

Accessories

• Clamp Meter Attachment (Not Included): Use a clamp meter attachment to measure currents. Connect the clamp meter's black lead to the COM terminal and the red lead to the Input terminal.
• Multi-Function Socket (Included): Used for measuring Capacitors and Transistors. Ensure correct insertion into COM and INPUT terminals, matching negative to COM and positive to INPUT.

Detailed Specifications

DC Voltage (Auto Ranging)

Input Impedance: 10MΩ. Overload Protection: 600V DC/AC RMS. Max. Input voltage: 600V DC. Measure DCV 1000V under CATII.

AC Voltage (Auto Ranging)

Input Impedance: 10MΩ. Frequency Range: 40Hz ~ 400Hz. Overload Protection: 600V DC/AC rms. Measure AC V 750V under CATII CAT III. Max. Input voltage: 600V AC RMS CATIII.

Temperature

Overload Protection: F0.4A/600V Fuse.

DC Current

Overload Protection: "mA" Jack: F0.4A/600V fuse; "10A" Jack: F10A/600V fuse. Max. Input Current: "mA” jack: 600mA; "10A” jack: 10A. (For measurements >5A: Duration <10 seconds, interval >15 minutes). Voltage Drop: 600μA, 60mA: 60mV; 6000μA, 600mA and 10A ranges: 600mV.

Transistor hFE Test (Connect Adapter)

AC Current

Overload Protection: "mA" jack: F0.4A/600V fuse; "10A" jack: F10A/600V fuse Max. Input Current: "mA" jack: 400mA; "10A" jack: 10A. (For measurements>5A: duration<10 seconds, interval >15 minutes). Voltage Drop: 600μA, 60mA ranges: 60mV; 6000μA, 600mA and 10A ranges: 600mV. Frequency Range: 40Hz ~ 400Hz.

Resistance (Auto Ranging)

Open Circuit Voltage: about 0.25V. Overload Protection: 250V DC/AC RMS.

600A AC current through a clamp (DT3303 optional)

Diode and Continuity

Overload Protection: 250V DC/AC rms. For continuity test: When the resistance is between 30Ω and 70Ω, the buzzer may sound or may not sound. When the resistance is more than 70Ω, the buzzer will not sound.

Capacitance

Overload Protection: F0.4A/600V fuse. Open circuit voltage: about 0.5V.

Frequency (Auto Ranging)

Overload Protection: 250V DC/AC RMS.

Operating Instructions

Voltage Measurement

1. Connect the black test lead to the "COM" jack and the red test lead to the "INPUT " jack.
2. Set the function switch to V~ or V--- range. Choose either Auto or Manual range using the "Range" Button.
3. In manual range, if the voltage magnitude to be measured is unknown beforehand, select the highest range.
4. Connect the test leads to the source or load to be measured.
5. Read LCD display. The polarity of the red lead connection will be indicated when making a DC measurement.

Note:

• When measuring small ranges, the multimeter's display may show an unstable result if the test leads are not connected to the load being measured. This is normal and will not affect measurements.
• In manual range, if the multimeter shows "OL" or Over Range, you must select a higher range to get results.
• To avoid damage to the meter, do not measure voltage exceeding 600V DC or 600V AC CATIII.

Current Measurement

1. Connect the black test lead to the "COM" jack. If the current to be measured is less than 600mA, connect the red test lead to the "mA" jack. If the current is between 600mA and 10A, connect the red test lead to the "10A" jack instead.
2. Set the function switch to the necessary range (μA, mA, or A). If the current magnitude is not known beforehand, set the function switch to the highest range and then reduce it range by range until a satisfactory resolution is obtained.
3. Select DC current measurement or AC current measurement with the "Select" Button. There is no option to change between manual and automatic ranges for current measurements.
4. Connect the test leads to the source or load to be measured.
5. Read LCD display. The polarity of the red test lead will be indicated.

Resistance Measurement

1. Connect the black test lead to the "COM" jack and the red test lead to the "INPUT " jack.
2. Set the function switch to "Ω" range.
3. Select either Auto or Manual range with the "Range" button. In manual range, if the Resistance magnitude to be measured is not known beforehand, select the highest range.
4. Connect the test leads to the source or load to be measured.
5. Read LCD display. The polarity of the red test lead will be indicated.

Note:

• For resistance measurements >1MΩ, the meter may take a few seconds to stabilize reading. This is normal for high-resistance measurement.
• When the input is not connected (at open circuit), the symbol "OL" will be displayed as an over range indicator.
• Before measuring in-circuit resistance, ensure that the circuit under test has all power removed and all capacitors are fully discharged.

Continuity Test

1. Connect the black test lead to the "COM" jack and the red test lead to the "INPUT " jack.
2. Set the function switch to "Ω" range.
3. Press the "Select" Button to select continuity measurement mode, and the symbol "•)))" will appear on the display.
4. Connect the test leads across the load to be measured.
5. If the circuit resistance is lower than about 30Ω, the built-in buzzer will sound.

Diode Test

1. Connect the black test lead to the "COM" jack and the red test lead to the "INPUT " jack.
2. Set the function switch to "Ω" range.
3. Press the "Select" Button to select continuity measurement mode, and the symbol "➡️|--" will appear on the display.
4. Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode.
5. The meter will show the approximate forward voltage of the diode. If the connections are reversed, "OL" will be shown on the display. In this case, simply switch the test leads from the anode to the cathode and vice versa.

Transistor Test

1. Set the function switch to "hFE " range.
2. Connect the multi-function socket to the "COM" and "INPUT" Jacks. The negative side of the socket must connect to COM and the positive to INPUT. It is very important not to reverse these by mistake.
3. Identify whether the transistor is NPN or PNP type and locate Emitter, Base, and Collector leads. Insert the leads of the transistor to be tested into the proper holes of the transistor test socket of the adapter.
4. Read the LCD display for the approximate hFE value.

Temperature Measurement

1. Set the function switch to "°C/°F" range.
2. Use the Select Button to choose either Celsius or Fahrenheit.
3. Insert the negative (black) plug of the K-type thermocouple to the COM Jack and the positive (red) plug to the INPUT Jack.
4. Carefully touch the end of the thermocouple to the object being measured.
5. Wait for the temperature reading to settle, then record the result from the LCD display.

Capacitance Measurement

1. Set the function switch to "[Capacitance Symbol]" range.
2. Connect the multi-function socket to the "COM" and "INPUT" Jacks. The negative side of the socket must connect to COM and the positive to INPUT. It is very important not to reverse these by mistake.
3. Place the capacitor into the multifunction-socket with the positive end in the positive (INPUT) side of the multifunction-socket and the negative end of the capacitor in the negative (COM) terminal of the multifunction-socket.
4. The results will be displayed on the LCD display.
5. If your Capacitor's legs are too short to be used with the multifunction-socket, use the test leads:
   • Connect the black test lead to the "COM" jack and the red test lead to the "INPUT" jack.
   • Set the function switch to "[Capacitance Symbol]" range.
   • Connect the test leads to the capacitor to be measured. Be sure to be aware of the polarity of the connection.

Note: When the capacitance under measure is more than 600uF, it needs at least 10 seconds to make readings stable.

Frequency Measurement

1. Set the function switch to the "Hz Duty" position.
2. Connect the black test lead to the "COM" jack and the red test lead to the "INPUT " jack.
3. Connect the leads to what is being measured, then get the results on the LCD screen.

Note: Do not apply more than 250V RMS to the input.

Current Measurement (with Clamp attachment)

1. To measure current with a clamp, use either a clamp specifically made for DC current or AC current.
2. Connect the negative output lead of the clamp to the COM Jack and the positive output lead to the INPUT Jack.
3. Set the function switch to "[Current Symbol]" range.
4. Clamp the circuit to be measured with the clamp.
5. The results will be displayed on the LCD display.

Note:

• Each time a measurement is taken, make sure that only one cable is clamped and is in the center of the clamp jaws.
• The clamp can only test for up to 600A; do not test circuits higher than 600A.
• Do not touch the circuit with hand or skin.
• The multimeter assumes a clamp has a sensitivity of 1A/1mV. The indicated value is the same as the measured value for clamps with 1A/1mV. If you use a clamp whose sensitivity does not equal 1mV/1A, multiply the present reading by a factor determined by the used clamp. To determine the factor, please refer to the instructions of the clamp you use.

Auto Power Off

The meter will power off after approximately 15 minutes of inactivity. To turn it on again, turn the rotary function switch, or press the "Select" or "Range" button for more than 2 seconds.

Battery Replacement

If the "?" symbol appears on the display, the battery should be replaced immediately. Remove the rubber sleeve and the screws on the back of the multimeter to replace the battery. Replace with NEDA 1604, 6F22, or equivalent 9V battery. Disconnect the test leads before opening the back of the multimeter.

Fuse Replacement

Fuses will rarely need replacement and are normally only blown due to operator error. To replace the fuses, open the battery cover by removing the rubber sleeve as well as the screws on the back of the multimeter. Disconnect the test leads before opening the back of the multimeter. Replace the damaged fuse with a new one with the same ratings. This meter uses two fuses:

• Fuse 1: 400mA, 600V, FAST, Min. Interrupt Rating 20000A, Ø10X38mm
• Fuse 2: 10A, 600V, FAST, Min. Interrupt Rating 20000A, Ø10X38mm

Accessories

• 1 x Owners Manual
• 1 x Pair of Test Leads
• 1 x K-Type Thermocouple
• 1 x Multi-Function Socket

Disposal

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

1 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 support@astroai.com.