Victor 925 Digital Multimeter

1. Summary

The Victor 925 is a large-screen intelligent multi-purpose digital multimeter designed for ease of use and accuracy. It automatically identifies functions and ranges based on the input measurement signals, simplifying operation. This product adheres to safety regulations CAT III 600V, featuring full functional design overload protection for safe and reliable operation. Its innovative design includes functions such as DCV, ACV, DCA, ACA, resistance, capacitance, frequency, diode and continuity tests, NCV (non-contact ACV induction measurement), Live (live line judgment), and a built-in torch. It is an ideal tool for electronic hobbyists and home users.

2. Unpacking Inspection

Upon opening the package, please verify that all parts and accessories are present and in good condition. The standard package contents include:

• User's manual: 1 pc
• Test leads: 1 pair
• Type-C charge line: 1 pc
• Carrying bag: 1 pc

3. Safety Operation Rules

This device is designed in accordance with IEC61010-1 standard (safety standard issued by International Electrotechnical Commission or equivalent standard GB4793), and meets CAT III 600V standard and Level II pollution. Please read the following safety notices carefully before use:

1. Input over-range is prohibited in each range during the test.
2. The voltage less than 36V is considered a safety voltage. When measuring voltage higher than DC 36V or AC 25V, always check the connection and insulation of test leads to prevent electric shock. If the input ACV/DCV is more than 24V, the display screen will turn red as a high voltage warning.
3. When changing function and range, test leads should be removed from the testing point.
4. Always select the correct function and range to avoid incorrect operation. Even with full range protection, caution is advised.
5. Do not input voltage when measuring capacitance, diode, or performing continuity tests under manual range mode.
6. Comply with local and national safety regulations.
7. Wear personal protective equipment (such as approved rubber gloves, face masks, and flame-retardant clothing) to prevent injury from electric shock and arc when working with charged conductors.
8. Measure according to the correct standard measurement category (CAT), voltage probe, testing wire, and adaptor.

Safety Symbols

• ⚠ (Warning): Indicates a warning.
• ⚠ (High Voltage Danger): Indicates high voltage.
• ⊥ (Ground): Indicates ground.
• ≈ (AC and DC): Indicates alternating current and direct current.
• ⏹ (Dual Insulation): Indicates dual insulation.
• CE: Accord with order of the European Union.
• 🔋 (Low Battery Voltage): Indicates low battery.
• 🔋 (Fuse): Indicates fuse.

4. External Structure and LCD Display

External Structure Components:

1. Power key/live wire judgment
2. LCD display
3. Type-C charging terminal
4. Measuring input terminal
5. Flashlight
6. Data hold/backlight key
7. NCV/flashlight button
8. Function switch key

LCD Display Characteristics:

• Max display: 9999 counts
• Polarity display: Automatic positive and negative polarity.
• Over-range display: "OL" (Overload) is shown.
• High voltage warning: When input ACV/DCV is >24V, the display screen turns red.
• Power supply: Built-in 3.7V 500mAh lithium battery.
• Low voltage display: A battery symbol appears, indicating the battery voltage is low and needs charging.
• Automatic shutdown function: After 15 minutes of inactivity, the meter will shut down automatically. This function can be turned off.

5. Charging and Key Functions

5.1. Charging Instruction

The multimeter uses a built-in lithium battery. When the low battery symbol appears on the LCD, it needs to be charged. Use a USB DC5V 1A~5A charging adapter (not included) and the provided Type-C charging cable. The red indicator light is on during charging, and it turns green when fully charged. A full charge provides approximately 75 hours of working time (less if flashlight/backlight/buzzing are used). Standby time after full charge (after sleep shutdown) is over 10000 hours.

Note:

• For safety, do not use the meter while charging. It has a protection setting that automatically turns off the meter and prevents use when the charging cable is inserted.

5.2. Power/Live Key

• Long press: Turns the power on/off.
• Short press (when on): Switches between Live and Auto functions.

5.3. HOLD B/L Key (Data Hold/Backlight)

• Short press: Toggles the data hold function. "H" will display on the screen when activated.
• Long press (>2 seconds): Turns the backlight on/off. The backlight automatically turns off after 15 seconds.

Warning:

• To prevent electric shock, fire, or personal injury, do not use the data hold function to measure unknown voltage. When data hold is active, the LCD will retain the original data even when measuring a different voltage.

5.4. NCV (Non-Contact Voltage) / Flashlight Key

• Short press: Toggles NCV function measurement.
• Long press (>2 seconds): Turns the flashlight on/off.

Note:

• The flashlight will not automatically turn off; manually turn it off to save power.

5.5. FUNC Key (Function Switch)

• Short press: In manual mode, cycles through test functions: resistance, diode, continuity, capacitance, DCV, ACV, frequency/FrEq, and automatic identification (Auto).

6. Measurement Instructions

Before starting any measurement, ensure the battery is sufficiently charged. If the low battery symbol is displayed, charge the device. Pay attention to the warning symbol next to the test lead jacks, indicating that voltage and current should not exceed the specified values.

The multimeter supports two modes:

• Auto Mode: Automatically measures resistance (R), continuity, DCV, ACV, DCA, and ACA functions.
• FUNC Manual Mode: Measures Resistance (R), Continuity, Diode (D), Capacitance (C), DCV, ACV, Frequency (Freq), and Automatic Identification (Auto).

6.1. DCV and ACV Measurement

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack.
2. Switch to the DCV/ACV range (auto/manual mode) and connect the test leads across the circuit under test. The voltage and polarity will be displayed.
3. The main display shows the tested voltage value. The secondary display shows room temperature (for DCV) and accompanying frequency (for ACV). For ACV, the measured value must be ≥50V for frequency display.

Note:

• "OL" (Overload) is displayed if the measurement is out of range.
• When measuring high voltage (above 220V), wear personal protective equipment.
• If input ACV/DCV is >24V, the display screen will turn red.

6.2. DCA and ACA Measurement

1. Insert the black test lead into the "COM" jack and the red test lead into the "mA" jack.
2. Connect the test leads in series with the power or circuit under test.
3. You can test in auto mode.
4. Read the result on the LCD.

Note:

• Before connecting test leads to the power or circuit, turn off the circuit power and ensure the input terminal and function range are correct. Do not measure voltage in current terminal.
• The maximum measuring current is 600mA. An alarm sounds if the measuring range is exceeded. Overload input or incorrect operation can blow the fuse.
• The main display shows the tested current value, and the secondary display shows room temperature (for DCA) and accompanying frequency (for ACA).

6.3. Resistance Measurement

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack.
2. Switch to resistance function (auto/manual mode) and connect the test leads across the resistor.
3. Read the result on the LCD.

Note:

• "OL" is displayed if resistance is over range.
• For resistance over 1MΩ, the meter may take a few seconds to stabilize, which is normal.

6.4. Capacitance Measurement

1. Discharge all capacitance completely before measuring to avoid damage to the meter.
2. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack.
3. Select the capacitance function (manual mode) and connect the test leads to the capacitor with correct polarity (red lead is "+").
4. Read the result on the LCD.

Note:

• Capacitance range switches automatically. "OL" indicates it has exceeded the range (max 99.99mF).
• When measuring capacitance, due to distributed capacitance, there may be a residual reading without connection. Subtract this value for accurate readings.
• For large capacitance ranges, if a capacitor is broken or leaking, the LCD may display an unstable value.

6.5. Diode Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack (red lead is "+").
2. Convert to diode test function (manual mode) and connect the test leads to the diode.
3. The reading is an approximation of the diode forward voltage drop. If connected in reverse, it will display "OL".

6.6. Continuity Test

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack.
2. Convert to continuity test function (auto mode).
3. Connect the test leads to two points of the circuit. If resistance is <50Ω, the LCD will display a buzzer sound.

6.7. Live Line Recognition

1. Insert the red test lead into the "VΩHz" jack.
2. Short press the "POWER/Live" key to switch to live line function.
3. Connect the red test lead to the tested point. If there is a sound and light alarm, the line is live. If nothing changes, the line is not live.

Note:

• Operate according to safety rules.
• This function only detects AC standard mains power lines (AC 110V-AC 380V).

6.8. NCV (Non-Contact ACV Induction Measurement)

1. Short press the "NCV" key to convert to NCV function. LCD shows "EF".
2. NCV induction voltage range is 48V~250V. Position the meter close to the charged electric field (AC power line, socket, etc.). The NCV induction intensity indicator in the middle of the LCD displays "EF", and the buzzer sounds. As the intensity of the sensed electric field increases, more horizontal lines "----" are displayed on the LCD.

Note:

• When the measured electric field voltage is ≥AC100V, pay attention to whether the conductor is insulated to avoid electric shock.

6.9. Auto Power Off Function

To save battery energy, the APO (Auto Power Off) function is enabled by default. If there is no operation for 14 minutes, the meter will beep three times. If there is still no operation, it will sound continuously and power off after one minute.

To disable/enable APO: Press the NCV key while the power is off, then turn on the power. The APO function will be canceled, and the LCD will not display the "APO" symbol. After canceling, the device will not shut down in 15 minutes. Starting up normally will reactivate APO.

6.10. Frequency Measurement

1. Insert the black test lead into the "COM" jack and the red test lead into the "VΩHz" jack.
2. In manual mode, press the FUNC key to select the frequency range. The main screen of the LCD will display "FrEq".
3. Read the result from the lower part of the LCD.

Note:

• Frequency input amplitude requirements: 10Hz-100kHz: 1Vrms ≤ input amplitude ≤ 20Vrms. (Reference amplitude 2.5V)
• Maximum display: 999.9kHz, over range display OL.

Demonstration Video:

7. Specifications

Accuracy: ±(a% × rdg + digit), with an accuracy environment temperature of (23±5)°C, relative humidity < 75%, and a one-year guarantee since the production date.

General Specifications:

• Dimensions: 137 × 70 × 20 mm (length × width × height)
• Weight: Approximately 133g
• Operating Temperature: 0 ~ 40 °C / Relative humidity <75%RH
• Storage Temperature: -20 ~ 60 °C / Relative humidity <85%RH
• Max Display: 9999 counts
• Power Supply: 3.7V 500mAh lithium battery
• Backlight: Yes (2 colors)
• NCV: Yes
• Flashlight: Yes
• Data Record: Yes
• Is Smart Device: Yes
• Operating Mode: Auto Range
• Certification: CE
• Origin: Mainland China

Measurement Ranges and Accuracy:

Note: Measuring Inductance Range is not applicable for this model.

8. Maintenance and Care

The Victor 925 is an accurate meter. Do not attempt to modify the electric circuit.

1. Pay attention to the waterproof, dustproof, and shockproof features of the meter.
2. Do not store or use the meter in environments with high temperature, high humidity, high flammability, or strong magnetic fields.
3. Wipe the meter with a damp cloth and soft detergent. Avoid abrasive and drastic solvents such as alcohol.

9. Troubleshooting

If the meter does not function normally, the following methods may help resolve common problems. If these methods do not work, please contact the service center or dealer.

10. User Tips

• Always start with Auto mode: For general measurements, the auto-ranging feature is convenient and usually sufficient.
• Check battery regularly: A low battery can affect measurement accuracy. Charge promptly when the indicator appears.
• Use data hold for stable readings: When measuring in hard-to-reach areas, use the data hold function to capture the reading once stable.
• Safety first: Always double-check connections and ensure power is off before testing components in a circuit.
• Keep leads organized: Proper storage of test leads prevents damage and ensures reliable connections.

11. Warranty and Support

This product comes with a standard manufacturer's warranty. For specific warranty details, service, or technical support, please refer to the official documentation or contact the seller directly.

A detailed user manual in PDF format is available for download: Victor 925 Digital Multimeter User Manual (PDF).