MASTFUYI FY167, FY168, FY168S Voltage Detector Multimeter

⚠️ Safety Information

This instrument is designed and manufactured in accordance with IEC-61010-1 standard for electronic measuring instruments. It features double insulation protection (II Level) and meets CATIII (installation) level III pollution level 2 standards, providing pulse withstand voltage protection.

Important: Users must pay special attention to safety precautions to avoid electric shock or damage to the instrument. Always follow the safety rules and measures specified in this manual. Ensure proper electrical grounding.

The meter complies with EC(EU) standards (CE mark) and meets the technical requirements of GB/T13978-2008 and GB 4793. It is designed for secondary pollution environments with an over-voltage standard of CAT III 600V.

General Safety Rules:

• Use universal protection to avoid electric shock.
• Avoid misuse of the meter.
• Inspect the meter for any damage before use, especially after transportation or prolonged storage.
• Ensure test leads are in good condition with intact insulation and no exposed metal wires.
• Always select the correct function and measuring range.
• Do not exceed the maximum voltage or current limits specified for each range.
• When testing, keep fingers behind the test lead protector for voltages over 60V DC or 30V AC (RMS).
• Stop testing if the measured voltage exceeds 520V DC (for FY167) or 620V DC/AC (for FY168/FY168S).
• Remove test leads from the circuit before switching measurement functions.
• Do not measure resistance or continuity on live circuits.
• Do not use the meter in environments with explosive gas, steam, or dust.
• Discontinue use immediately if any abnormality or malfunction is detected.
• Ensure the meter's bottom shell and battery cover are completely closed before operation.

Product Description

Part Names

Refer to the diagrams for visual identification. Key parts include:

• 1. V-Alert Sensor Area: Detects non-contact voltage.
• 2. Flashlight: Integrated LED light for illumination.
• 3. Display Screen: LCD screen showing measurement values and symbols.
• 4. Function Switching Button (SEL): Cycles through measurement modes.
• 5. Auto Mode Button: Activates automatic range and mode detection.
• 6. Voltage Sensing (V~Alert) / Live Wire Check Button: Controls non-contact voltage detection sensitivity and live wire check.
• 7. Flashlight Switching / Temperature Mode Button: Controls flashlight and temperature measurement.
• 8. Capacitance Mode Button (+): Selects capacitance measurement mode.
• 9. Diode Mode Button (*): Selects diode test mode.
• 10. Power Button (⚡): Turns the meter on/off and enables auto-shutdown.
• 11. Input Terminals: Ports for connecting test leads.

Display Symbols:

• V~Alert: Indicates non-contact voltage detection is active.
• AUTO: Indicates the meter is in automatic range and mode detection.
• OL / -OL: Indicates an over-range condition.
• —: Indicates negative polarity.
• ⚡: Indicates low battery.
• ℃ / ℉: Indicates temperature measurement units.
• %: Indicates duty cycle measurement.
• Hz / kHz: Indicates frequency measurement units.
• V / mV: Indicates voltage measurement units.
• Ω / kΩ / MΩ: Indicates resistance measurement units.
• nF / µF / mF: Indicates capacitance measurement units.
• mA: Indicates milliampere (current) measurement.
• ))): Indicates continuity test mode.
• ? (Flashlight Icon): Indicates flashlight is on.
• ? (Battery Icon): Indicates battery charging status.

Specifications

Overview

• Automatic Range: Yes
• Full Measuring Range Overload Protection: Yes
• Auto Mode: Automatically identifies AC voltage, DC voltage, resistance, and continuity.
• Display: LCD
• Maximum Display Value: 1999 digits (FY167), 5999 digits (FY168), 6000 digits (FY168S)
• Polarity Indication: Self-indicating ('-' for negative polarity).
• Over-range Display: 'OL' or '-OL'.
• Sampling Time: Approx. 0.4 seconds.
• Automatic Power Off: After 15 minutes of inactivity.
• Battery Low Voltage Indication: Displayed via a symbol.
• Operational Temperature & Humidity: 0°C to 40°C, 0% to 80% RH.
• Storage Temperature & Humidity: -10°C to 60°C, 0% to 70% RH.
• Battery: 3.7V Li-ion battery (internal).
• Operating Altitude: ≤ 2000m.
• Dimensions: 146 x 44 x 25.2 mm.
• Weight: 73g (FY167), 95g (FY168/FY168S, with sheath).

Technical Index

Test conditions: Environmental temperature 18°C to 28°C, relative humidity <80% RH.

DC Voltage

Input Impedance: 10MΩ (FY168/FY168S)

Maximum Input Voltage: 520V DC (FY167), 620V DC (FY168/FY168S)

AC Voltage

Input Impedance: 10MΩ (FY168/FY168S)

Maximum Input Voltage: 520V AC (FY167), 620V AC (FY168/FY168S)

Frequency Range: 10Hz~1000Hz (2V~620V) (FY168/FY168S)

Resistance

Capacitance

Frequency

Temperature (K-type thermocouple)

Note: Temperature specifications do not include thermocouple errors. Thermocouples are optional accessories.

DC Current

AC Current

Other Functions

• Continuity: Buzzer sounds if resistance < 500Ω.
• Diode Test: Measures diodes within 3.0V.
• V-Alert (Non-contact Voltage Sensing): Detects AC voltage without contact. Indicates presence and strength via buzzer and backlight (Low/Mid/High range).
• Live Wire Check: Identifies live wires with buzzer and red backlight.
• Duty Cycle: (FY168S) Measures duty cycle.

Operation Instructions

Powering On/Off: Press and hold the Power button (⚡) for 1 second to turn the meter on or off. A short press of the Power button enables/disables auto-shutdown.

Auto Mode

Upon powering on, the meter defaults to AUTO mode. In this mode, it automatically identifies and measures AC voltage, DC voltage, resistance, and continuity. Connect the test leads to the circuit or component to be measured; the meter will display the appropriate measurement.

Manual Mode Selection (SEL Button)

Short press the SEL button to manually cycle through different measurement functions. Available functions include DC Voltage, AC Voltage, VFC (Variable Frequency Voltage - FY168/FY168S), Resistance, Continuity, Frequency (FY168/FY168S), and Duty Cycle (FY168S).

Specific Measurement Procedures:

Voltage Measurement (AC/DC)

Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal. Select the desired voltage mode (AC or DC) or use Auto mode. Connect the probes across the voltage source or in parallel with the component. The voltage reading will be displayed.

Resistance Measurement

Ensure the circuit is de-energized. Connect the test leads as for voltage measurement. Select the resistance mode (Ω). Touch the probes to the component to be measured. The resistance value will be displayed.

Continuity Test

Ensure the circuit is de-energized. Connect the test leads as for resistance measurement. Select the continuity mode (indicated by a speaker or `)))` symbol). If the resistance is below approximately 500Ω, a buzzer will sound, indicating continuity.

Capacitance Measurement

Warning: Before measuring capacitance, ensure the capacitor is fully discharged. Do not connect to AC or DC voltage. Connect the black probe to the COM terminal and the red probe to the appropriate capacitance terminal (often shared with VΩmA). Select the capacitance mode (+). Connect the probes to the capacitor terminals. The capacitance value will be displayed.

Diode Test

Connect the black probe to the COM terminal and the red probe to the VΩmA terminal. Select the diode mode (*). Connect the red probe to the anode and the black probe to the cathode of the diode. The meter will display the forward voltage drop. If the diode is open or reversed, 'OL' will be displayed.

Frequency Measurement (FY168/FY168S)

Connect the test leads as for voltage measurement. Select the frequency mode (Hz/kHz). Connect the probes to the signal source. The frequency will be displayed.

Temperature Measurement (FY168/FY168S)

Connect the K-type thermocouple to the appropriate input terminals (often shared with VΩmA, observing polarity). Select the temperature mode (°C/°F). The meter will display the measured temperature.

V-Alert (Non-Contact Voltage Sensing)

Short press the V~Alert button to activate this mode. Bring the V-Alert sensor area near a conductor. The meter indicates the presence and approximate strength of AC voltage through:

• Low Sensitivity: Screen displays 1/3 analog bar, slow buzzer alarm.
• High Sensitivity: Screen displays 2/3 or full analog bar, quicker buzzer alarm, and red backlight flashes.

Short press the V~Alert button again to switch between low and high sensitivity modes, or to exit the mode.

Live Wire Check

This function is typically integrated with V-Alert. When a live wire signal is strongly detected, the buzzer sounds, and the red backlight flashes.

Flashlight

Short press the Flashlight button (often shared with Temperature) to turn the LED flashlight on or off.

Current Measurement (FY168/FY168S)

Note: Current measurement requires inserting the red probe into the dedicated current terminal (mA). The meter will automatically switch to current mode.

Connect the black probe to the COM terminal and the red probe to the mA terminal. Select the appropriate current mode (AC or DC). Connect the meter in series with the circuit where current is to be measured.

Maintenance

Warning: To avoid electric shock, remove test leads from any circuit before opening the battery cover.

General Maintenance

• Do not operate the product in hot, wet, flammable, explosive, or strong magnetic environments.
• Clean the product with a damp cloth and mild detergent. Do not use abrasives or solvents.
• Remove input signals before cleaning.
• If the product will not be used for an extended period, remove the batteries to prevent leakage.

Battery Charging

When the ? symbol appears on the display, the internal battery needs charging.

1. Remove the test leads from the target circuit.
2. Loosen the battery door fastener and remove the door from the case bottom.
3. Remove the battery cover.
4. Use the provided USB cable to charge the internal battery. The red indicator light will illuminate during charging and turn green when fully charged.
5. The meter cannot be turned on or used while charging.