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ANENG SZ27 Multimeter

ANENG SZ27 Digital Multimeter User Manual

Model: SZ27

1. Introduction

The ANENG SZ27 is a handheld pocket digital multimeter designed for high-precision measurements. This versatile instrument can measure AC/DC voltage, AC/DC current, resistance, capacitance, and frequency. It also features diode testing, transistor (hFE) testing, circuit continuity, and Non-Contact Voltage (NCV) detection. With its backlit LCD screen and durable silicone sheath, the SZ27 is an ideal tool for on-site operations, laboratories, factories, radio enthusiasts, and home applications.

2. Safety Information

WARNING: To avoid possible electric shock or personal injury, and to avoid possible damage to the meter or to the equipment under test, follow these safety rules:

  • Read this manual carefully before using the multimeter.
  • Do not apply more than the rated voltage, as marked on the meter, between the terminals or between any terminal and earth ground.
  • Use caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC. Such voltages pose a shock hazard.
  • Always ensure the test leads are in good condition, without any damage to the insulation.
  • Before measuring current or resistance, ensure the circuit power is OFF and discharge all high-voltage capacitors.
  • Always use the proper function and range for measurements.
  • Do not use the meter if it appears damaged or if the case is not fully closed.
  • Replace the battery as soon as the low battery indicator appears to ensure accurate readings.

3. Package Contents

Upon opening the package, please verify that all items listed below are present and undamaged:

  • 1 x ANENG SZ27 Digital Multimeter
  • 1 x Pair of Test Leads (Pen wire)
  • 1 x Storage Bag
  • 1 x User Manual (this document)
  • 1 x Packing Box
ANENG SZ27 Multimeter package contents including multimeter, test leads, storage bag, and manual.
Figure 3.1: Contents of the ANENG SZ27 Multimeter package.

4. Product Overview

Familiarize yourself with the components and controls of your ANENG SZ27 Digital Multimeter:

Detailed diagram of the ANENG SZ27 Multimeter with all parts labeled.
Figure 4.1: ANENG SZ27 Multimeter Labeled Parts
  1. Silicone Sheath: Provides protection against drops and impacts.
  2. LCD Backlit Display: Shows measurement readings and indicators.
  3. Backlight/HOLD Button: Long press for backlight, single press for data retention.
  4. hFE Triode Jack: Socket for transistor testing.
  5. Indicator Light: Used for NCV detection and other alerts.
  6. DC Voltage Gear: Rotary switch position for DC voltage measurement.
  7. NCV Gear: Rotary switch position for Non-Contact Voltage detection.
  8. AC Voltage Gear: Rotary switch position for AC voltage measurement.
  9. AC Current Gear: Rotary switch position for AC current measurement.
  10. Red Test Lead Input (VΩmA): Positive input for voltage, resistance, capacitance, frequency, diode, and mA current measurements.
  11. Common Input (COM): Negative input for all measurements.
  12. 10A Current Input: Positive input for high AC/DC current measurements (up to 10A).
  13. mA Current Input: Positive input for low AC/DC current measurements (up to 10A).
  14. Capacitance Gear: Rotary switch position for capacitance measurement.
  15. DC Current Gear: Rotary switch position for DC current measurement.
  16. On/Diode Gear: Rotary switch position for continuity and diode testing.
  17. Function Turntable: Rotary switch to select measurement functions.
  18. Resistance Gear: Rotary switch position for resistance measurement.
  19. hFE Triode Gear: Rotary switch position for hFE transistor testing.
  20. ON/OFF Button: Power switch for the multimeter.
  21. SELECT Button: Used to switch between functions within a single rotary switch position (e.g., AC/DC, Diode/Continuity).
  22. Hz Gear: Rotary switch position for frequency measurement.
  23. Low Power Prompt: Indicator for low battery.
ANENG SZ27 Multimeter showing the back shrink bracket extended for angled viewing.
Figure 4.2: Adjustable Back Shrink Bracket for convenient viewing angle.

5. Specifications

The following table details the measurement functions, ranges, resolutions, and precision of the ANENG SZ27 Multimeter:

Table of ANENG SZ27 Multimeter measuring functions, ranges, resolutions, and precision.
Figure 5.1: ANENG SZ27 Measurement Function and Range
FunctionRangeResolutionPrecision
DC Voltage0mV-1000V0.1mV-1V±(1.2%+ 5d)
AC Voltage0mV-750V0.1mV-1V±(1.8%+ 5d)
DC Current0mA-10A100nA-10mA±(1.5%+ 5d)
AC Current0mA-10A10uA-10mA±(2.5%+10d)
Resistance0Ω-200MΩ0.1Ω-100kΩ±(4.0%+10d)
Capacitor0nF-2mF10PF-1uF±(4.5%+ 10d)
Hz Frequency2kHz±(1.5%+ 8d)
hFE Triode√Automatic shutdown
NCV√Battery model6F22 9V battery*1 (Not included)
Diode√MaterialABS/Silicone
On-Off Beep√Backlit bright screen√
Maximum Count1999 countsHold data√
Low Power Prompt√Automatic Shutdown15 minutes of inactivity
Weight268g

Note: The parameters are for reference only, and the actual measurement of the specific equipment shall prevail. The 2000V gear requires insertion into the 2KV positive socket (if applicable).

6. Setup

6.1 Battery Installation

The ANENG SZ27 Multimeter requires one 9V 6F22 battery (not included) for operation. Follow these steps to install the battery:

  1. Ensure the multimeter is turned OFF.
  2. Locate the battery compartment cover on the back of the multimeter.
  3. Use a screwdriver to open the battery compartment cover.
  4. Insert a new 9V 6F22 battery, observing the correct polarity (+ and -).
  5. Replace the battery compartment cover and secure it with the screw.
ANENG SZ27 Multimeter performing battery detection, showing positive and negative electrodes for a 12V battery. This illustrates the general principle of connecting to battery terminals.
Figure 6.1: Example of battery connection (for detection, not installation). Ensure correct polarity during installation.

6.2 Connecting Test Leads

Always connect the test leads correctly before taking any measurements:

  • Insert the black test lead into the COM (Common) input jack.
  • For most measurements (voltage, resistance, capacitance, frequency, diode, hFE, and mA current), insert the red test lead into the VΩmA input jack.
  • For high current measurements (up to 10A), insert the red test lead into the 10A MAX input jack.

7. Operating Modes

To operate the multimeter, press the ON/OFF button to power it on. Select the desired function using the rotary dial. Use the SELECT button to toggle between AC/DC modes or other sub-functions if available within a single dial position.

7.1 Measuring DC Voltage (V-)

  1. Turn the rotary dial to the V- position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. Connect the test leads in parallel across the component or circuit to be measured.
  4. Read the DC voltage value on the display.

7.2 Measuring AC Voltage (V~)

  1. Turn the rotary dial to the V~ position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. Connect the test leads in parallel across the AC voltage source.
  4. Read the AC voltage value on the display.

7.3 Measuring DC Current (A-)

  1. Turn the rotary dial to the appropriate A- range (e.g., 200mA, 10A).
  2. Connect the black test lead to the COM terminal.
  3. Connect the red test lead to the VΩmA terminal for mA ranges, or to the 10A MAX terminal for 10A range.
  4. WARNING: Always connect the multimeter in series with the circuit. Turn off power to the circuit before connecting the meter.
  5. Apply power to the circuit and read the DC current value.

7.4 Measuring AC Current (A~)

  1. Turn the rotary dial to the appropriate A~ range (e.g., 200mA, 10A).
  2. Connect the black test lead to the COM terminal.
  3. Connect the red test lead to the VΩmA terminal for mA ranges, or to the 10A MAX terminal for 10A range.
  4. WARNING: Always connect the multimeter in series with the circuit. Turn off power to the circuit before connecting the meter.
  5. Apply power to the circuit and read the AC current value.

7.5 Measuring Resistance (Ω)

  1. Turn the rotary dial to the Ω position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. Ensure the circuit is de-energized and all capacitors are discharged.
  4. Connect the test leads across the component to measure its resistance.
  5. Read the resistance value on the display.

7.6 Measuring Capacitance (F)

  1. Turn the rotary dial to the F position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. WARNING: Always discharge capacitors before testing to prevent damage to the meter.
  4. Connect the test leads across the capacitor.
  5. Read the capacitance value on the display.

7.7 Measuring Frequency (Hz)

  1. Turn the rotary dial to the Hz position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. Connect the test leads across the signal source.
  4. Read the frequency value on the display.

7.8 Diode Test

  1. Turn the rotary dial to the Diode symbol position.
  2. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  3. Connect the red test lead to the anode and the black test lead to the cathode of the diode.
  4. The display will show the forward voltage drop. Reverse the leads; the display should show "OL" (Open Line) for a good diode.

7.9 Continuity Test (On-Off Beep)

  1. Turn the rotary dial to the Diode symbol position.
  2. Press the SELECT button until the continuity symbol (a speaker icon) appears on the display.
  3. Connect the black test lead to the COM terminal and the red test lead to the VΩmA terminal.
  4. Connect the test leads across the circuit or component.
  5. If the resistance is below a certain threshold (typically <50Ω), the buzzer will sound, indicating continuity.

7.10 hFE Triode Measurement

  1. Turn the rotary dial to the hFE position.
  2. Identify the Emitter (E), Base (B), and Collector (C) terminals of the transistor.
  3. Insert the transistor leads into the corresponding holes in the hFE triode jack on the multimeter.
  4. Read the hFE (DC current gain) value on the display.
ANENG SZ27 Multimeter performing hFE Triode Measurement, showing a transistor inserted into the hFE jack.
Figure 7.1: hFE Triode Measurement in progress.

7.11 Non-Contact Voltage (NCV) Detection

  1. Turn the rotary dial to the NCV position.
  2. Bring the top end of the multimeter close to an AC voltage source (e.g., a live wire or outlet).
  3. If AC voltage is detected, the indicator light will flash red and the buzzer will sound, with the frequency of beeps increasing as the meter gets closer to the source.
ANENG SZ27 Multimeter performing NCV voltage detection, showing the indicator light flashing red and a beep alarm.
Figure 7.2: NCV Voltage Detection in action.

7.12 Data Hold (HOLD)

Press the HOLD button briefly to freeze the current reading on the display. Press it again to release the hold function.

7.13 Backlight

Long press the Backlight/HOLD button to turn the LCD backlight ON or OFF. This feature allows for clear visibility in dark environments.

7.14 Automatic Shutdown

The multimeter will automatically power off after approximately 15 minutes of inactivity to conserve battery life. Press any button or turn the rotary dial to wake it up.

8. Troubleshooting

This section addresses common issues you might encounter while using your ANENG SZ27 Multimeter.

8.1 Millivolt Value Jump / Non-Zero Reading in mV File

It is normal for the multimeter's mV file to show a non-zero reading or for the millivolt value to jump. This can be due to:

  • Excessive changes in ambient temperature and humidity: Environmental factors can influence sensitive readings.
  • Strong electric field or magnetic field interference: External electromagnetic interference can affect the meter's sensors.

If the meter does not return to zero, try shorting the red and black test leads. If it still does not return to zero, it is likely due to environmental factors and does not affect the use of the multimeter. It is recommended to eliminate environmental interference factors as much as possible for accurate measurement results.

Troubleshooting guide for millivolt value jump and current measurement precautions.
Figure 8.1: Millivolt value jump explanation and current measurement precautions.

8.2 Incorrect Current Measurement Readings

When measuring current, it is crucial to follow the correct procedure:

  • Current must be measured in series with the circuit. Never connect the multimeter in parallel when measuring current, as this can damage the meter and the circuit.
  • Always select the appropriate current range. If the display shows "1" (overload indicator), it means the selected range is too low; immediately switch to a higher range.
  • Ensure the red test lead is inserted into the correct current input socket (mA or 10A) for the expected current level.
  • Before inserting the meter into the circuit, disconnect power, break the circuit, and then insert the meter in series.

9. User Tips

  • The multimeter features a durable silicone sheath, providing excellent anti-drop protection for hardware.
  • The LCD backlight display ensures that readings are clearly visible even in dimly lit environments.
  • The instrument uses a standard 9V battery, making replacements easy and convenient.

10. Maintenance

  • Cleaning: Use a soft, damp cloth to clean the meter's casing. Do not use abrasives or solvents.
  • Storage: When not in use for extended periods, store the multimeter in its storage bag in a cool, dry place, away from direct sunlight and extreme temperatures.
  • Battery Replacement: Replace the 9V battery promptly when the low power prompt appears on the display to maintain measurement accuracy. If the meter is not used for a long time, remove the battery to prevent leakage.
  • Test Leads: Regularly inspect the test leads for any signs of damage, such as cracked insulation or exposed wires. Replace damaged leads immediately.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your original retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.

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