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Aneng SZ18 - User Manual

Aneng SZ18
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User Manual

Table of Contents

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Summary

Introduction

Safety Information

Crucial safety guidelines and warnings to prevent electrical shock, fire, or injury.

Function Buttons

Rotary Button Operation

Input Terminals

Measurements Instruction

Measure AC;DC Voltage

Step-by-step guide for measuring AC and DC voltage using the multimeter.

Measure AC;DC Current

Instructions for performing AC and DC current measurements with the multimeter.

Measure Resistance

Procedure for measuring electrical resistance using the multimeter.

Test Diodes and Continuity

Maintenance

Replace the Batteries

Replace the Fuses

Specifications

General Specifications

Electrical Specifications

Detailed technical specifications for all measurement functions and ranges.

Overview

  1. Safety Information
  2. Instrument Overview
    1. LCD Display Indicators
    2. Function Buttons
    3. Rotary Button
  3. Input Terminals
  4. Measurements Instruction
    1. Measure AC/DC Voltage
    2. Measure AC/DC Current
    3. Measure Resistance
    4. Test Diodes and Continuity
    5. Measure Capacitance
    6. Measure Frequency and Duty Cycle
    7. Measure Temperature
    8. Test NCV (Non-Contact Voltage)
    9. Measure V.F.C (Variable Frequency Drive)
    10. Measure Square Wave
  5. Maintenance
  6. Technical Specifications
    1. General Specifications
    2. Mechanical Specifications
    3. Environmental Specifications
    4. Electrical Specifications

This document serves as a user manual for a 9999 counts true RMS auto-ranging digital multimeter, operated entirely by buttons and featuring a triple display. It provides comprehensive information on the device's functions, safety guidelines, technical specifications, and maintenance procedures.

Safety Information

To ensure safe operation and prevent electrical shock, fire, or personal injury, users must adhere to the following safety precautions:

  • Always inspect the product for cracks, missing plastic, or damaged insulation around the terminals before use.
  • Ensure measurements are made with the correct input terminals and functions, and within the allowable measuring range.
  • Avoid using the product in environments with explosive gas, vapor, or in damp/wet conditions.
  • Keep fingers behind the finger guards on the probes during measurements.
  • Do not touch input terminals not in service when the product is connected to a circuit.
  • Disconnect test leads from the circuit before changing modes.
  • Exercise extreme caution when measuring voltages exceeding 36V DC or 25V AC to prevent electric shock.
  • Be aware that "OL" on the display indicates an input out of range.
  • Replace batteries when the battery level is low to ensure accurate readings. Do not make measurements if the battery door is not properly placed.
  • Do not measure current or voltage that exceeds the extremes indicated in the specifications.
  • Disconnect circuit power and discharge all capacitors before testing resistance or diodes.
  • Do not input voltage when testing current, resistance, capacitance, temperature, or square wave.

Instrument Overview

The device features an LCD display with several indicators and a rotary button for function selection.

LCD Display Indicators:

  • AUTO: Auto range selection, where the product automatically selects the best resolution range.
  • MANU: Manual range selection, allowing the user to choose the range.
  • F: Capacitance test (Farad).
  • Δ: Relative mode.
  • →|: Diode test.
  • •))): Continuity test.
  • %: Duty cycle test.
  • -8.8.8.8: Secondary measurements display.
  • AC: Alternating current.
  • DC: Direct current.
  • Hz: Frequency test (Hertz).
  • °C: Temperature test (Celsius).
  • °F: Temperature test (Fahrenheit).
  • Analog bar graph: Visual representation of the measured value.
  • Ω: Resistance test (Ohm).
  • A: Current test (Ampere).
  • V: Voltage test (Volt).
  • -8.8.8.8: Primary measurement display.
  • T-RMS: True RMS, indicating accurate measurement of both sinusoidal and non-sinusoidal AC waveforms.
  • +: Low battery indicator, prompting battery replacement.
  • -: Negative readings.
  • HOLD: Display freezes the present reading.
  • V.F.C: Frequency converter test.
  • MAX: Display maximum value.
  • MIN: Display minimum value.
  • nkMpm: Measurement units.

Function Buttons:

  • SELECT/V.F.C: Short press to switch among functions. Long press to enter V.F.C function.
  • RANGE/REL: Short press to change range. Long press (more than 2 seconds) to enter relative mode, storing the current reading as a reference and zeroing the display for subsequent readings. Long press again to exit relative mode.
  • MAX/MIN: Press to switch MAX/MIN test. Long press (2 seconds) to quit MAX/MIN mode.
  • HOLD/FLASHLIGHT: Push once to hold the current reading. Push again to continue normal operation. Long press (beyond 2 seconds) to turn on/off the flashlight.

Rotary Button:

The rotary button is used to select different measurement functions and to turn the product off.

  • OFF: Turns off the product.
    • The product automatically powers off after 15 minutes of inactivity.
    • The built-in beeper sounds 5 times 1 minute before auto power off.
    • To restart from auto power off, press the SELECT button or turn the rotary switch to OFF and then to a desired position.
    • To disable auto power off, hold down the SELECT button while turning on the product; five beeps will confirm successful disabling.

Input Terminals:

  • A: Input terminal for AC/DC current measurements up to 9.999A.
  • μA/mA: Input terminal for AC/DC current measurements up to 99.99mA.
  • COM: Common (return) terminal for all measurements.
  • VΩHz+: Input terminal for measurements of Diode, Continuity, Square wave, Temperature, AC/DC voltage, Resistance, Frequency, and Capacitance.

Measurements Instruction

Measure AC/DC Voltage:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. For voltages under 99.99mV, turn the rotary to %HzmV. For voltages higher than 99.99mV, turn the rotary to V.F.C %HzV, then press SELECT for AC voltage test mode.
  3. Touch probes to circuit test points.
  4. Read voltage on screen.
  • Do not exceed specified voltage limits or touch high voltage circuits.

Measure AC/DC Current:

  1. Connect the black test lead to COM and the red lead to A or μA/mA (based on expected current).
  2. Turn the rotary to A, mA, or μA.
  3. Break the circuit, connect test leads across the break, and apply power.
  4. Read current on display.
  • Do not exceed specified current limits. Use AmA terminal for unknown currents, switch to μA if necessary. Do not input voltage.

Measure Resistance:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary to Ω, then press "SELECT" for Resistance Mode. "OL" will show initially.
  3. Touch probes to circuit test points.
  4. Read resistance on display.
  • Disconnect power and discharge capacitors before testing. Do not input voltage.

Test Diodes and Continuity:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary to Ω, then press "SELECT" for Continuity Mode.
  3. For continuity, touch probes to circuit test points; beeper sounds for short circuits.
  4. For diodes, connect red probe to anode and black probe to cathode. Read forward bias voltage. "OL" indicates reversed polarity or a broken diode.
  • Do not input voltage. Disconnect power and discharge capacitors before testing diodes.

Measure Capacitance:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary to Ω, then press "SELECT" for Capacitance Mode.
  3. Connect red probe to anode and black probe to cathode of the diode being tested.
  4. Read capacitance value once stabilized.
  • Disconnect power and discharge capacitors before testing diodes.

Measure Frequency and Duty Cycle:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary switch to V.F.C %HzV, then press SELECT for frequency test (≥10V, 1~100KHz); or turn to %HzmV, then press SELECT for frequency test (≤10V, 1~5MHz).
  3. For frequencies between 100kHz and 5MHz, press SELECT to enter AC mV position. Touch probes to test points; vice display shows frequency. Press SELECT again; main display shows frequency, vice display shows duty cycle.

Measure Temperature:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary to %HzmV, then press "SELECT" for Temperature Mode. Main display shows Celsius, vice display shows Fahrenheit.
  3. Touch probes to desired test points.
  4. Read temperature on display.
  • Do not input voltage.

Test NCV (Non-Contact Voltage):

  1. Turn the rotary to NCV position, then press "SELECT" for Temperature Mode.
  2. Hold the product and move it around. The built-in beeper will sound when the inner sensor detects AC voltage nearby. The stronger the voltage, the quicker the beeper sounds.

Measure V.F.C (Variable Frequency Drive):

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary to V.F.C %HzV, long press SELECT V.F.C to enter V.F.C mode. The screen will show voltage when test leads are connected to the correct circuit.

Measure Square Wave:

  1. Connect the black test lead to COM and the red lead to VΩHz+.
  2. Turn the rotary switch to ∏OUT. The default output frequency is 50Hz. Press the SEL button to change the output frequency.
  3. Touch the probes to the desired test points.
  • Do not input voltage.

Maintenance

  • General Maintenance: Do not attempt to repair or service the product unless qualified and possessing relevant calibration, performance test, and service instructions.
  • Cleaning: Wipe the product with a damp cloth and mild detergent. Avoid abrasives or solvents. Remove input signals before cleaning.
  • Battery Replacement: When the low battery indicator is shown, replace batteries:
    1. Remove test leads and turn off the product.
    2. Loosen the screw on the battery door and remove it.
    3. Replace with new batteries of the same type.
    4. Replace the battery door and fasten the screw.
  • Fuse Replacement: If a fuse is blown or not working properly, replace it:
    1. Remove test leads and turn off the product.
    2. Loosen the four screws on the back cover and the screw on the battery door. Remove both the battery door and the back cover.
    3. Replace the fuse with a new fuse of the same type.
    4. Replace the back cover and battery door, then fasten the screws.

Technical Specifications

General Specifications:

  • Display: LCD, 9999 Counts
  • Ranging: Auto/Manual
  • Material: ABS+TPE
  • Update Rate: 3 Times/Second
  • True RMS: Yes
  • Data Hold: Yes
  • Backlight: Yes
  • Low Battery Indication: Yes
  • Auto Power Off: Yes

Mechanical Specifications:

  • Dimension: 147*76*37mm
  • Weight: 191g (without batteries)
  • Battery Type: 1.5V AAA Battery * 3
  • Warranty: One year

Environmental Specifications:

  • Operating Temperature: 0~40°C
  • Operating Humidity: <75%
  • Storage Temperature: -20~60°C
  • Storage Humidity: <80%

Electrical Specifications:

DC Voltage (V)

  • Range: 999.9mV, Resolution: 0.1mV, Accuracy: ±(0.5%+3)
  • Range: 9.999V, Resolution: 0.001V, Accuracy: ±(0.5%+3)
  • Range: 99.99V, Resolution: 0.01V, Accuracy: ±(0.5%+3)
  • Range: 999.9V, Resolution: 0.1V, Accuracy: ±(0.5%+3)

DC Voltage (mV)

  • Range: 9.999mV, Resolution: 0.001mV, Accuracy: ±(0.5%+3)
  • Range: 99.99mV, Resolution: 0.01mV, Accuracy: ±(0.5%+3)

AC Voltage (V)

  • Range: 999.9mV, Resolution: 0.1mV, Accuracy: ±(1.0%+3)
  • Range: 9.999V, Resolution: 0.001V, Accuracy: ±(1.0%+3)
  • Range: 99.99V, Resolution: 0.01V, Accuracy: ±(1.0%+3)
  • Range: 750.0V, Resolution: 0.1V, Accuracy: ±(1.0%+3)
  • Frequency response of ACV: 40Hz-1kHz

AC Voltage (mV)

  • Range: 9.999mV, Resolution: 0.001mV, Accuracy: ±(1.0%+3)
  • Range: 99.99mV, Resolution: 0.01mV, Accuracy: ±(1.0%+3)
  • Frequency response of ACV: 40Hz-1kHz

DC Current (A/mA)

  • Range: 9.999A, Resolution: 0.001A, Accuracy: ±(1.0%+3)
  • Range: 999.9mA, Resolution: 0.1mA, Accuracy: ±(1.0%+3)
  • Range: 99.99mA, Resolution: 0.01mA, Accuracy: ±(1.0%+3)

DC Current (μA/mA)

  • Range: 9.999mA, Resolution: 0.001mA, Accuracy: ±(1.0%+3)
  • Range: 99.99μA, Resolution: 0.01μA, Accuracy: ±(1.0%+3)
  • Range: 999.9μA, Resolution: 0.1μA, Accuracy: ±(1.0%+3)

AC Current (A/mA)

  • Range: 9.999A, Resolution: 0.001A, Accuracy: ±(1.2%+3)
  • Range: 999.9mA, Resolution: 0.1mA, Accuracy: ±(1.2%+3)
  • Range: 99.99mA, Resolution: 0.01mA, Accuracy: ±(1.2%+3)
  • Frequency response of AC Current: 40Hz-1kHz

AC Current (μA/mA)

  • Range: 9.999mA, Resolution: 0.001mA, Accuracy: ±(1.2%+3)
  • Range: 99.99μA, Resolution: 0.01μA, Accuracy: ±(1.2%+3)
  • Range: 999.9μA, Resolution: 0.1μA, Accuracy: ±(1.2%+3)
  • Frequency response of AC Current: 40Hz-1kHz

Resistance

  • Range: 99.99Ω, Resolution: 0.01Ω, Accuracy: ±(1.0%+3)
  • Range: 999.9Ω, Resolution: 0.1Ω, Accuracy: ±(0.5%+3)
  • Range: 9.999kΩ, Resolution: 0.001kΩ, Accuracy: ±(0.5%+3)
  • Range: 99.99kΩ, Resolution: 0.01kΩ, Accuracy: ±(0.5%+3)
  • Range: 999.9kΩ, Resolution: 0.1kΩ, Accuracy: ±(0.5%+3)
  • Range: 9.999MΩ, Resolution: 0.001MΩ, Accuracy: ±(1.5%+3)
  • Range: 99.99MΩ, Resolution: 0.01MΩ, Accuracy: ±(3.0%+5)

Capacitance

  • Range: 9.999nF, Resolution: 0.001nF, Accuracy: ±(5.0%+20)
  • Range: 99.99nF, Resolution: 0.01nF, Accuracy: ±(2.0%+5)
  • Range: 999.9nF, Resolution: 0.1nF, Accuracy: ±(2.0%+5)
  • Range: 9.999μF, Resolution: 0.001μF, Accuracy: ±(2.0%+5)
  • Range: 99.99μF, Resolution: 0.01μF, Accuracy: ±(2.0%+5)
  • Range: 999.9μF, Resolution: 0.1μF, Accuracy: ±(2.0%+5)
  • Range: 9.999mF, Resolution: 0.001mF, Accuracy: ±(5.0%+5)

Frequency (Measures only to 100kHz under the ACV setting)

  • Range: 9.999Hz, Resolution: 0.001Hz, Accuracy: ±(0.1%+2)
  • Range: 99.99Hz, Resolution: 0.01Hz, Accuracy: ±(0.1%+2)
  • Range: 999.9Hz, Resolution: 0.1Hz, Accuracy: ±(0.1%+2)
  • Range: 9.999kHz, Resolution: 0.001kHz, Accuracy: ±(0.1%+2)
  • Range: 99.99kHz, Resolution: 0.01kHz, Accuracy: ±(0.1%+2)
  • Range: 999.9kHz, Resolution: 0.1kHz, Accuracy: ±(0.1%+2)
  • Range: 5.000MHz, Resolution: 0.001MHz, Accuracy: ±(0.1%+2)

Duty Cycle

  • Range: 1%~99%, Resolution: 0.1%, Accuracy: ±(0.1%+2)

Temperature

  • Range: (-20~1000)°C, Resolution: 1°C, Accuracy: ±(2.5%+5)
  • Range: (-4~1832)°F, Resolution: 1°F, Accuracy: ±(2.5%+5)

Diode: Yes Continuity: Yes NCV: Yes Square wave: Yes V.F.C: Yes

Aneng SZ18 Specifications

General IconGeneral
BrandAneng
ModelSZ18
CategoryMultimeter
LanguageEnglish

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