Thank you for purchasing the AstroAI True RMS 4000 Counts Digital Multimeter. The AstroAI True RMS 4000 Digital Multimeter is designed to be safely and accurately used by professionals in a commercial setting or DIYers who need a little more utility from their standard digital multimeter.
WARNING To avoid possible electric shock, personal injury, meter damage, and damage to the equipment being tested, always adhere to the following rules: Before using the meter, inspect its exterior casing. Do not use the meter if it is damaged or if any part of its exterior casing is removed.
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When using the test leads, always keep your fingers behind the finger guards. Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, or diodes. Replace the battery as soon as the low battery symbol appears. With a low battery, the meter may produce false readings that can lead to electric shock and personal injury.
INCLUDED IN BOX User Manual ×1 K-Type Thermocouple ×1 Pair of Test Leads ×1 AstroAI 4000 Counts Multimeter ×1 DIAGRAM LCD Screen Rubber Sleeve Function Buttons INPUT Jack Rotary Switch Test Leads COM Jack K-Type Thermocouple A Jack - 06 -...
DIMENSIONS 6.2 in (158 mm) 3 in (76 mm) 1.4 in (35 mm) ELECTRICAL SYMBOLS DC (Direct Current) Automatic Power-O AC (Alternating Current) Data Hold AC and DC Maximum Reading Fahrenheit Temperature Minimum Reading Celsius Temperature Auto-Range Mode Duty Cycle Low Battery Frequency Negative Reading...
FUNCTION BUTTONS Select Button When using the rotary switch to select a multimeter function, use the Select Button to select a more specific function. Hold/Backlight Button When taking a measurement, press this button to hold the data for easier recording. Press the button again to remove the hold function. Press and hold this button to turn on the LCD screen’s backlight.
Relative Button When taking measurements, you can utilize the Relative Button to get more accurate readings by removing the resistance of the test leads. To activate this function, simply press the Relative Button. A small triangle (delta symbol) will appear on the display and the reading should change to zero.
OPERATING INSTRUCTIONS Voltage Measurement 1. Connect the test leads: Insert the red test lead into the “Input” Jack and the black test lead into the “COM” Jack. 2. Choose functions: Turn the rotary switch to the “V ” or “V ” settings according to the measured voltage.
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2. Choose functions: Turn the rotary switch to the “µA ” , “mA ” , or “A ” settings according to the estimated value. 3. Choose current types: Press the “Select” Button to test the DC current test value or the AC current test value. 4.
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3.Connect the load: Place the test leads at both ends of the resistor to be measured. 4. Reading: Record the reading from the LCD screen. After measure- ment, turn the rotary switch to the “OFF” position to turn o the meter. Note: a.
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4. Reading: If the circuit load is less than 30 Ω, the buzzer will buzz. If it exceeds 30 Ω, the LCD screen will display the load reading. After measurement, turn the rotary switch to the “OFF” position to turn o the meter.
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Temperature Measurement 1. Insert the negative (black) plug of the K-type thermocouple into the “COM” Jack and the positive (red) plug into the “INPUT” Jack. 2. Choose functions: Turn the rotary switch to the “ºC” or “ºF” setting. 3. Method: Carefully use the end of the K-Type thermocouple to touch the object being measured.
MAINTENANCE Battery Replacement If the “ ” symbol appears on the display, the battery should be replaced immediately. 1. Turn o the power and remove the test leads plugged into the meter. 2. Unscrew the screw and remove the kickstand to replace the battery. 3.
TROUBLESHOOTING 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.
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8. If a removed fuse reduces the battery draw to below 50 mA, it can be determined the corresponding circuit is drawing the excess discharge. 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 the negative, then the diode should be in a forward conduction state.
SPECIFICATIONS Digital Display 3 ¾, 3999 Sampling Speed 2 Times Per Second LCD Size 2.17 x 1.22 in (55 x 31 mm) Range Selection Auto or Manual Polarity Indication “-” Displayed Overload Indication “OL” Displayed Low Battery Indication Operating Environment 32~104 °F (0~40 °C);...
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Input Impedance: 10 MΩ Overload Protection: 600 V DC or 600 V AC RMS (200 mV Range: 250 V DC/AC RMS) Max Input Voltage: 600 V DC AC Voltage (Auto-Ranging) Range Resolution Accuracy 400 mV 1 mV ± (1.2% + 5) 1 mV 40 V 10 mV...
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DC Current Range Resolution Accuracy 400 µA 0.1 µA 4000 µA 1 µA 40 mA 10 µA ± (1.2% + 8) 400 mA 100 µA 1 mA 10 A 10 mA Overload Protection: µA and mA Ranges: F0.5 A/600 V fuse 4 A and 10 A Ranges: F10 A/600 V fuse Max Input Current: “INPUT”...
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4000 µA, 400 mA, and 10 A Ranges: 400 mV Frequency Range: 40 Hz ~ 400 Hz Response: Average, calibrated in RMS of sine wave Resistance (Auto-Ranging) Range Resolution Accuracy 400 Ω 0.1 Ω 4 kΩ 1 Ω 40 kΩ 10 Ω...
WARRANTY PERIOD 3-Year Limited Warranty from AstroAI. Each AstroAI True RMS 4000 Counts Digital Multimeter will be free from defects in material and workmanship. This warranty does not cover fuses, disposable batteries, and damage from neglect, misuse,...
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