AStroAI DT132A Digital Multimeter User Manual

AStroAI DT132A Digital Multimeter

Function Buttons

• Select Button: Used to select a specific function after using the rotary switch.
• Hold/Backlight Button: Holds data for recording and controls the LCD backlight.
• Max/Min Button: Captures maximum and minimum readings during measurements.
• Range Button: Allows for manual range selection and switching between Auto and Manual ranging.

Preparation

1. Connect the test leads: Insert the red test lead into the Input Jack and the black test lead into the COM Jack.

2. Select Continuity Mode: Turn the rotary switch to the continuity setting and choose Continuity Mode.

3. Check test leads: Touch the red and black test leads together to ensure they are functioning correctly.

FAQ

• Q: How do I change the battery of the DT132A Digital Multimeter?
• A: To change the battery, follow these steps:
  • 1. Turn off the multimeter and disconnect any test leads.
  • 2. Remove the screws on the back cover to access the battery compartment.
  • 3. Replace the old battery with a new one, ensuring correct polarity.
  • 4. Close the battery compartment and secure the back cover with screws.

INTRODUCTION

• 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.
• This manual provides all safety information, operation instructions, specifications, and maintenance information for the meter. This instrument performs AC/DC Current, AC/DC Voltage, Resistance, Diode, Capacitance, Continuity, Frequency, Duty Cycle, and Temperature measurements.
• Thank you again for choosing AstroAI, if you have any questions or concerns regarding your product, please contact us via support@astroai.com.

If you have any questions or concerns when using this product, please feel free to contact our customer support or refer to the detailed user manual on the product page.

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. 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. Failure to do so may damage the meter.
• When the meter is working at an effective voltage over 60 V in DC or 30 V RMS in AC, exercise extra caution, there is an increased risk of electric shock.
• Always use the proper terminals, functions, and ranges for your measurements.
• Do not use or store the meter in a high-temperature environment, near strong magnetic fields, or in high levels of humidity. The meter’s performance may deteriorate after exposure to moisture.
• 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.
• Before opening the meter’s case, turn the meter off and disconnect the testing leads from the circuit being tested.
• When servicing the meter, only use replacement parts with the same model number or identical electrical specifications as the original.
• Do not alter the meter’s internal circuitry, doing so may damage the meter and cause personal injury.
• Clean the meter’s exterior using a soft cloth and mild cleaner. To prevent unnecessary corrosion and damage, do not clean with abrasive materials or solvents.
• Turn the meter off when not in use and remove the battery when it is not going to be used for an extended period. 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.

INCLUDED IN BOX

• User Manual ×1
• Pair of Test Leads ×1
• K-Type Thermocouple ×1
• AstroAI 4000 Counts Multimeter ×1

DIAGRAM

1. LCD Screen
2. Function Buttons
3. Rotary Switch
4. COM Jack
5. A Jack
6. Rubber Sleeve
7. INPUT Jack
8. Test Leads
9. K-Type Thermocouple

DIMENSIONS

ELECTRICAL SYMBOLS

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.
Press and hold the button again to turn off the backlight.

Max/Min Button

• When taking a measurement, press this button once to enter “Max Mode”. In this mode, the multimeter will capture the highest reading it records. Press this button again to enter “Min Mode” which will capture the lowest reading it records.
• Press and hold this button to exit the Max/Min Modes.

Range Button
AC/DC Voltage, AC/DC Current, and Resistance can all be measured in both Auto and Manual ranges. The multimeter will ship set to Auto. But if you desire to manually select the range, press the Range Button repeatedly to find the desired range. Beware of selecting a range too low, as it will overload the device and the multimeter will not display a reading. Press and hold the Range Button to return to Auto Ranging.

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. Press the Relative Button again to exit Relative Mode.
Hz/Duty Button
When using the Hz/Duty function on the multimeter, press this button to quickly switch functions. You can also switch to measuring the Hz/Duty cycle during AC voltage measurement.

PREPARATION

1. Connect the test leads: Insert the red test lead into the “Input” Jack and the black test lead into the “COM” Jack.
2. Turn the rotary switch to the “ ” setting and choose the “Select” Button. Then, choose Continuity Mode. The “ ” symbol will display on the screen.
3. Touch the red and black test leads together to check whether they are functioning normally. The meter will beep harshly if the leads are functioning normally.

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 “ ” or “ ” settings according to the measured voltage.
3. Connect the circuit: Connect one end of the test leads to the circuit that needs to be measured, in parallel with the circuit.
4. Reading: Record the reading from the LCD screen. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Note

• During DC voltage measurement, use the “ ” symbol on the screen to judge the polarity of the red test lead connection. If the “ ” symbol is absent, that means the red test lead is connected with positive polarity.
• To avoid damaging the meter, do not measure voltages exceeding 600 V DC or 600 V AC.
• Press the Hz/Duty Button to switch to Frequency or Duty cycle when testing the AC voltage.

Current Measurement

1. Connect the test leads: Insert the black test lead into the “COM” Jack. If the current is less than 500 mA, insert the red test lead into the “INPUT” Jack; if the current ranges from 500 mA to 10 A, insert the red test lead into the “A” Jack.
2. Choose functions: Turn the rotary switch to the “ ” settings according to the estimated value.
3. Choose current types: Press the “Select” Button to test the DC test value or the AC test value.
4. Connect the circuit: Connect the test lead to the source lead or load to be measured, in series with the circuit.
5. Reading: Record the reading from the LCD screen. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Note

• DO NOT test currents exceeding 10 A AC/DC.
• When performing DC measurements, determine the polarity of the red lead connection based on the presence or absence of the “ ” symbol display. If the “ ” symbol is absent, that means the red test lead is connected with positive polarity.
• When testing a high current, for safety reasons, each measurement time should be less than 10 seconds. 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 unless there is a load to measure. Connecting in series without a load may damage the meter.

Resistance 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 “ ” setting and press the “Select” Button to choose the resistance mode.
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 measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Note

• If the resistance test value exceeds 1 M , the meter may take a few seconds to stabilize the reading. This is normal for high-resistance testing.
• Do not change the resistor while taking a measurement. Doing so may damage the meter and affect the test results.
• Do not test parallel circuits. The accuracy of the measurements will be assessed, and the results may not be accurate.
• Do not directly measure the internal resistance of micrometers, galvanometers, batteries, and other such instruments.
• In the event of disconnection, the “OL” symbol will display on the screen.
• Before testing the internal resistance of the circuit, please ensure that all power sources are removed from the tested circuit and all capacitors are fully discharged.

Continuity Test

1. Connect the test leads: Insert the red test lead into the “Input” Jack and the black test lead into the “COM” Jack.
2. Turn the rotary switch to the “ ” setting and choose the “Select” Button. Then, choose Continuity Mode. The “ ” symbol will display on the screen.
3. Connect the load: Place the test leads at both ends of the load to be measured.
4. Reading: If the circuit load is less than 30 , the buzzer will buzz. If it exceeds 30 , the LCD screen will display the load reading. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Diode Test

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 “ ” setting and press the “Select” Button to choose the Diode Mode. The “ ” symbol will display on the screen.
3. Connect the diode: Connect the red test lead to the positive end of the diode and the black test lead to the negative end.
4. Reading: The meter will display the approximate value of the positive voltage. If the leads are incorrectly connected to the diode electrodes, the LCD will display “OL”. The solution is to switch the test leads’ position. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Capacitance 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 “ ” setting and press the “Select” Button. Then, choose the Capacitance function.
3. Connect Capacitance： Connect to the capacitor that is to be measured.
4. Reading: Record the reading from the LCD screen. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

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.
4. Reading: Record the stable result from the LCD screen. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

Frequency 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. Press the “Hz/Duty” Button to switch to frequency measurement or duty cycle measurement.
3. Connect the signal source: Connect the test leads to the two ends of the circuit to be measured.
4. Reading: Record the reading from the LCD screen. After measurement, turn the rotary switch to the “OFF” position to turn off the meter.

MAINTENANCE

Battery Replacement

If the “ ” symbol appears on the display, the battery should be replaced immediately.

1. Turn off the power and remove the test leads plugged into the meter.
2. Unscrew the screw and remove the kickstand to replace the battery.
3. Remove the old batteries and replace them with new batteries of the same specification (size AAA, 1.5 V × 3).
4. Put the kickstand in place and fasten it with the removed screw.

Fuse Replacement

Fuses will rarely need replacement and are normally only blown due to operator error.

1. Turn off the power and remove the test leads plugged into the meter.
2. Remove the rubber sleeve of the multimeter and unscrew the 6 screws. Then, remove the back cover to replace the fuse.
3. Remove the blown fuses and replace them with new fuses of the same specification.
4. Put the back cover in its original position and secure it with screws.

Note

• Always replace a damaged fuse with a new one of the same rating.
• This meter uses two fuses:
• Fuse 1: 500 mA/600 V, Ø5 × 20 mm
• Fuse 2: 10 A/600 V, Ø5 × 20 mm

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. Check both jacks. One should have a reading and the other should remain at or near zero. The live wire will have the reading.

Automotive Parasitic Battery Drain

1. Check if the battery voltage and power generation are within the normal range. The battery voltage is generally around 12.7 V and the power generation is around 14 V.
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.
4. Connect the red test lead to the negative line and the black test lead to the battery terminal.
5. If necessary, adjust the meter to a lower range.
6. Wait for about 30 minutes; after all the modules of the vehicle enter their sleep state, read the accurate static discharge current. The discharge current is generally 0.02 A (20 mA). However, this can vary depending on the vehicle. Generally, it is normal to not exceed 50 mA.
7. If the drain is larger than 50 mA, begin checking fuses individually for which circuit is carrying the excess load.
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. The displayed value is the forward voltage drop.

Normal Diode Forward Pressure Drop
The general silicon tube is 0.5-0.7 V while the germanium tube is 0.15 – 0.3 V.

Polarity Judgment Method

1. Switch the multimeter to the Resistance setting.

2. Connect the two test leads to the diode’s two electrodes.

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 test lead is connected to the positive end of the diode and the red lead is connected to the negative end.

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: Yes
• Operating Environment: 32~104 °F (0~40 °C); <80% RH
• Storage Temperature: 14~122 °F (-10~50 °C); <85% RH
• Power: 3 x 1.5 V, AAA Battery
• Dimensions: 5.71 x 2.76 x 1.38 in (145 x 70 x 35 mm)
• Weight: Approximately 0.49Ib (223g)

DETAILED SPECIFICATIONS

Accuracy is guaranteed for 1 year when stored at 73±9 °F (23 ± 5 °C).
DC Voltage (Auto-Ranging)

Range Resolution Accuracy

± (0.8% + 3)

40 V| 10 mV
400 V| 100 mV
600 V| 1 V| ± (1.0% + 5)

• Input Impedance: 10 M
• 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

± (1.0% + 8)

40 V| 10 mV
400 V| 100 mV
600 V| 1 V| ± (1.2% + 5)

• Input Impedance: 10 M
• Frequency Range: 40 Hz ~ 400 Hz
• Overload Protection: 600 V DC or 600 V AC RMS
• Response: Average, calibrated in RMS of sine wave
• Max Input Voltage: 600 V AC RMS

Temperature

Range Resolution Accuracy

150 ~1370 °C: ± (2.5% + 4)
-40~2000 °F| 1 °F| -40~302 °F: ± (2.5% + 4)
302~2000 °F: ± (2.5% + 4)

Note: Different temperature sensors are configured in different temperature test ranges. Normal temperature sensors are provided for standard configuration.

DC Current

Range Resolution Accuracy

400 µA| 0.1 µA|

± (1.2% + 8)

---|---|---
4000 µA| 1 µA
40 mA| 10 µA
400 mA| 100 µA
4 A| 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” Jack: 200 mA
• “A” Jack: 10 A
• Voltage Drop: 400 μA, 40 mA, and 4 A Ranges: 40 mV
• 4000 μA, 400 mA, and 10 A ranges: 400 mV

AC Current

Range Resolution Accuracy

400 µA| 0.1 µA|

± (1.5% + 8)

---|---|---
4000 µA| 1 µA
40 mA| 10 µA
400 mA| 100 µA
4 A| 1 mA| ± (2.0% +10)
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” Jack: 200 mA
• “A” Jack: 10 A
• Voltage Drop: 400 μA, 40 mA, and 4 A Ranges: 40 mV
• 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|

± (1.5% + 3)

---|---|---
4 kΩ| 1 Ω
40 kΩ| 10 Ω
400 kΩ| 100 Ω
4 MΩ| 1 kΩ
40 MΩ| 10 kΩ

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

Diode and Continuity

Range Description Note

| The approximate forward voltage drop will be displayed.| Open circuit voltage: About 3 V
---|---|---
| The built-in buzzer will sound if the resistance is less than about 30 Ω.|

Open circuit voltage: About 1 V

• Overload Protection: 250 V DC/AC RMS
• For continuity test: When the resistance is between 50 and 100 , the buzzer may or may not sound. When the resistance is more than 100 , the buzzer will not sound.

Capacitance

Range Resolution Accuracy

± (5% + 5)

4 uF| 1 nF
40 uF| 10 nF
100 uF ~ 2 mF| 100 nF

Frequency

Range Accuracy

• 5/50/500/5 K; 50 K/500 K/5 MHz ± (1.0%+ 3)

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 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, 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

References

• AstroAI | For All of Life's Adventures - AstroAI US

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