Setup: Pro'skit MT-1508 Pocket Auto Range Multimeter User Manual

Overview

The MT-1508 Pocket Auto Range Multimeter is a compact digital multimeter for checking AC and DC voltage, AC and DC current, resistance, diode operation, and circuit continuity. Its automatic ranging, backlit LCD, built-in flashlight, data hold, and non-contact AC voltage detector make it suitable for electronics work, household troubleshooting, automotive checks, and general electrical testing.

The pocket-sized design is easy to carry, while the 3 1/2-digit display provides readings up to 1,999 counts. Although the meter is rated for CAT III 600 V applications, it should only be used by people who understand the hazards of electrical measurement and follow the safety instructions below.

Specifications

• Model: MT-1508
• Measurement functions: DC voltage, AC voltage, DC current, AC current, resistance, diode test, continuity, and non-contact AC voltage detection
• Display: 3 1/2-digit LCD with over-range indication
• DC voltage ranges: 200 mV, 2 V, 20 V, 200 V, and 600 V
• AC voltage ranges: 2 V, 20 V, 200 V, and 600 V
• DC current ranges: 200 µA, 2,000 µA, 20 mA, and 200 mA
• AC current ranges: 200 µA, 2,000 µA, 20 mA, and 200 mA
• Resistance ranges: 200 Ω, 2 kΩ, 20 kΩ, 200 kΩ, 2 MΩ, and 20 MΩ
• Diode test: 1 V display range, approximately 1 mA test current, and approximately 2.8 V open-circuit voltage
• Continuity threshold: The buzzer sounds at approximately 50 Ω or lower
• Maximum voltage between terminals and ground: 600 V DC or AC RMS
• Maximum current measurement: 200 mA
• Fuse: FF 250 mA/600 V
• Safety rating: IEC/EN 61010-1, 600 V CAT III, pollution degree 2, double insulation
• Power: Two 1.5 V AAA batteries
• Sampling rate: Approximately three readings per second
• Operating environment: 0 to 40°C; relative humidity below 80%, with the specified low-temperature condition below 10°C
• Storage environment: -10 to 60°C; relative humidity below 70% with the batteries removed
• Temperature coefficient: 0.1 times the specified accuracy per °C
• Dimensions: 125 × 60 × 26 mm

Detailed Description

The MT-1508 uses a rotary selector and function button to choose measurement modes. Its auto-range design selects a suitable range during normal testing, reducing the need to estimate the expected value before measuring.

• Flashlight: Illuminates the test area in dark or poorly lit locations.
• Non-contact voltage sensor: Detects the presence of AC voltage near a live conductor without making electrical contact.
• Non-contact voltage indicator: Lights when the sensor detects AC voltage under the specified detection conditions.
• LCD: Shows the measured value, polarity, low-battery symbol, and “OL” when the input exceeds the selected measurement capability.
• Function button: Selects between paired functions such as AC and DC voltage, AC and DC current, resistance, diode testing, and continuity.
• Backlight and flashlight control: Activates the display backlight and flashlight. Holding the control for about two seconds turns them on; the backlight switches off automatically after approximately 15 seconds without operation. Holding the control again for about two seconds turns it off manually.
• Data hold: Freezes the displayed reading so it can be viewed after moving the meter away from the test point.
• Rotary switch: Selects the main measurement group and the OFF position.
• Test leads: The red lead is the positive measuring lead and the black lead is the common reference lead.

Safety

Read the safety information before operating the MT-1508 Pocket Auto Range Multimeter. Incorrect lead placement, function selection, or connection method can cause electric shock, fire, injury, or meter damage.

• Inspect the case, input area, and test-lead insulation before every use. Do not operate the meter if it is cracked, damaged, or not working correctly.
• Do not touch energized conductors above 30 V AC RMS, 42 V AC peak, or 60 V DC.
• Never exceed the meter’s voltage, current, terminal, or CAT III 600 V ratings.
• Use the correct function, input connection, and measurement range for the test.
• Verify operation on a known voltage before testing an unknown circuit.
• Do not use the meter around explosive gas, vapor, or moisture.
• Do not use test leads with damaged insulation, exposed metal, excessive wear, or failed continuity.
• Keep fingers behind the test-lead finger guards while measuring.
• For energized circuits, connect the neutral or ground side before the live side. Disconnect the live side first when finishing.
• For current testing, disconnect power and discharge high-voltage capacitors before inserting the meter into the circuit.
• Never measure more than 200 mA. Exceeding this limit can blow the internal fuse.
• Use the meter only when the complete setup, including leads and accessories, remains within the lowest applicable CAT rating.
• Remove the test leads from the circuit before opening the rear cover.
• Wear suitable personal protective equipment when working near exposed hazardous conductors.

Setup and Operation

Powering On and Preparing the Meter

1. Install two 1.5 V AAA batteries with the polarity shown in the battery compartment.
2. Inspect the meter and leads for damage.
3. Turn the rotary switch away from OFF.
4. Select the required measurement group, then use the function button to choose the specific mode.
5. Test a known voltage when confirming that the meter is operating correctly.

AC or DC Voltage

1. Set the rotary switch to the voltage position.
2. Press the function button to select AC voltage or DC voltage.
3. Connect the test leads in parallel with the circuit or power source.
4. Read the value on the display. In DC mode, the display also indicates the polarity at the red-probe test point.
5. Disconnect the leads from the circuit after completing the measurement.

Do not apply more than 600 V. A higher voltage may appear on the display, but applying it can damage the instrument and create a serious shock hazard.

AC or DC Current

1. Turn the selector to the appropriate current position.
2. Press the function button to select AC current or DC current.
3. Switch off the circuit power and discharge all high-voltage capacitors.
4. Open the circuit at the point where current will be measured.
5. Connect the meter in series with the circuit.
6. Restore power and read the display.
7. Switch off the circuit again, remove the test leads, and restore the original wiring.

If the display shows “OL,” the input is outside the available measurement range. Never exceed the 200 mA maximum current rating.

Resistance

1. Turn the rotary switch to the resistance function. Press the function button if another function is displayed.
2. Switch off the circuit under test and discharge its capacitors.
3. Connect the leads across the component or circuit section.
4. Read the resistance value on the display.
5. Remove the leads after testing.

Resistance measurements must not be made on an energized circuit because external voltage can produce an incorrect reading or damage the meter.

Diode Test

1. Turn the selector to the diode or combined test position.
2. Press the function button until diode mode is selected.
3. Disconnect power and fully discharge capacitors in the circuit.
4. Connect the red lead to the diode anode and the black lead to the cathode.
5. Read the approximate forward-voltage drop on the display.

A reversed connection or open diode normally produces “OL.” Remove the leads when the test is complete.

Continuity Test

1. Turn the selector to the combined diode or continuity position.
2. Press the function button to select continuity mode.
3. Switch off the circuit and discharge capacitors.
4. Place the leads across the wire, switch, fuse, or circuit path being checked.
5. Listen for the buzzer. It sounds when the measured resistance is approximately 50 Ω or lower.

Non-Contact AC Voltage Detection

1. Turn the rotary switch to any position other than OFF.
2. Bring the non-contact voltage sensing area near the suspected AC live wire, keeping it less than 5 mm away.
3. Watch the non-contact voltage indicator. Illumination indicates detected AC voltage.

Non-contact detection is a warning function, not a substitute for a properly connected voltage measurement. Treat a conductor as energized until it has been safely isolated and verified.

Accuracy Reference

The stated accuracy applies for one year after calibration under reference conditions of 18 to 28°C and relative humidity of no more than 80%.

• DC voltage: ±(0.5% of reading + 3 digits) on 200 mV through 200 V ranges; ±(0.8% of reading + 5 digits) on the 600 V range.
• AC voltage: ±(0.8% of reading + 3 digits) on 2 V through 200 V ranges; ±(1.0% of reading + 5 digits) on the 600 V range. Frequency range is 40 to 400 Hz.
• DC current: ±(1.8% of reading + 5 digits) across the listed current ranges.
• AC current: ±(2.0% of reading + 5 digits) across the listed current ranges.
• Resistance: ±(1.0% of reading + 3 digits) from 200 Ω through 2 MΩ; ±(1.2% of reading + 15 digits) on the 20 MΩ range.

Cleaning and Maintenance

Disconnect all input signals and remove the test leads before cleaning. Wipe the housing with a slightly damp cloth and a small amount of mild detergent. Do not use abrasive cleaners or chemical solvents.

Do not attempt internal repairs unless you are a qualified service technician with the appropriate calibration and performance information. Never perform measurements while the case is open, and use only replacement parts with the specified ratings.

Replacing the Batteries

1. Switch the meter off.
2. Disconnect both test leads from the circuit.
3. Unscrew and open the rear battery cover.
4. Remove the depleted batteries and install new batteries of the specified type.
5. Replace and secure the cover before using the meter.

Replace the batteries when the low-battery symbol appears because a weak battery can cause inaccurate readings. Remove the batteries before storing the meter for a long period to reduce the risk of leakage damage.

Replacing the Fuse

1. Turn the meter off.
2. Disconnect the test leads from the circuit.
3. Open the rear cover.
4. Remove the failed fuse.
5. Install an FF 250 mA/600 V fuse with the required rating and speed.
6. Close and secure the cover before reconnecting the leads.

Troubleshooting

• “OL” appears: The input may exceed the selected range, the diode may be open or reversed, or the resistance may be outside the available range. Recheck the function and circuit connections.
• Low-battery symbol appears: Replace both AAA batteries promptly to avoid unreliable readings.
• Current mode stops working: The fuse may have opened, especially after exceeding 200 mA or connecting the meter incorrectly. Replace it only with the specified fuse after isolating the circuit.
• Continuity buzzer does not sound: The measured resistance may be above approximately 50 Ω, the leads may be damaged, or the circuit may still be energized. Turn off power and check the leads.
• Non-contact indicator does not light: Move the sensor closer than 5 mm to the AC live conductor and confirm that the meter is not in the OFF position. This function may not respond to every wiring arrangement, so use a safe direct voltage test for verification.
• Readings appear unstable or incorrect: Confirm the correct function and connection, inspect the probes, check the battery, and compare the meter with a known voltage source.

Warranty

The supplied warranty information states a 12-month free repair period from the original purchase date under normal use. Consumables are excluded. Coverage may not apply to external cosmetic damage, misuse, neglect, incorrect installation or testing, unauthorized repairs or modifications, accidents, fire, power irregularities, other hazards, or natural disasters.

Battery and other consumable items are not included in the stated warranty coverage. Service after the warranty period may incur repair or inspection charges, including parts costs where applicable.

Pros & Cons

Pros

• Compact 125 × 60 × 26 mm design for portable testing.
• Automatic ranging simplifies routine voltage, current, and resistance measurements.
• Measures both AC and DC electrical quantities.
• Includes diode testing, continuity buzzer, data hold, backlight, and flashlight.
• Non-contact AC voltage detection provides a convenient preliminary safety check.
• 600 V CAT III safety classification and double-insulation construction support suitable low-voltage distribution work when used correctly.

Cons

• The 200 mA maximum current limit is intended for low-current testing rather than high-current applications.
• The internal fuse must be replaced after an overload or incorrect current connection.
• Non-contact voltage detection only indicates a possible AC field and cannot replace a verified direct measurement.
• The meter does not provide a current range above 200 mA or a resistance range above 20 MΩ.