FNIRSI FNAC-28 USB Tester - Charger and Cable Testing Guide Malaysia

FNIRSI FNAC-28 USB Tester - Charger and Cable Testing Guide Malaysia

Introduction

USB charging technology is widely used in smartphones, tablets, power banks, electronic accessories and portable devices. However, when a device charges slowly or fails to charge properly, identifying the actual problem can be difficult without suitable testing equipment.

The FNIRSI FNAC-28 USB Tester is a compact digital measuring instrument designed to help users monitor USB charging voltage, current, power and other electrical parameters.

For electronics technicians, mobile phone repair shops, computer service centres and DIY electronics enthusiasts in Malaysia, the FNIRSI FNAC-28 USB Power Meter provides a practical way to investigate common USB charging problems.

This guide explains its main features, applications, limitations and important considerations before purchasing.

What Is the FNIRSI FNAC-28 USB Tester?

The FNIRSI FNAC-28 is a portable USB testing instrument that measures electrical parameters during USB charging.

Unlike basic USB testers that display only voltage and current, the FNAC-28 offers additional testing functions, including charging monitoring, supported fast-charging protocol identification and USB cable resistance testing.

The instrument can help users answer important questions:

Is the USB charger supplying the expected voltage?

How much current is the connected device drawing?

What is the actual charging power in watts?

Could the USB cable be contributing to slow charging?

Is the charger compatible with certain fast-charging protocols?

How does charging power change during a charging session?

These functions make the FNIRSI FNAC-28 USB Tester useful for everyday electronics troubleshooting.

FNIRSI FNAC-28 Main Features

FeatureDescriptionProduct ModelFNIRSI FNAC-28Product CategoryUSB Digital TesterVoltage Measurement Range4V to 24VCurrent Measurement Range0A to 6.5AMaximum Rated Power156WUSB InterfacesUSB-A and USB Type-CMeasurement FunctionsVoltage, Current and PowerAdditional FunctionsCharging Monitoring and Cable Resistance TestingFast ChargingSelected Protocol Detection and TriggeringDisplayDigital Colour DisplayApplicationsCharger, Cable and Power Bank Testing

Important: The maximum power rating is not a guarantee that every USB charging protocol or voltage-current combination can be tested. Users must observe the manufacturer's electrical limits and supported operating modes.

1. USB Charger Voltage Testing

One of the most common applications of the FNIRSI FNAC-28 USB Tester is measuring USB charger output voltage.

Many conventional USB chargers provide approximately 5V output, while compatible fast-charging systems may operate at higher voltages.

A USB tester helps technicians observe the voltage supplied during a charging session.

For example, if a charger is expected to provide approximately 5V but the measured voltage drops significantly under load, further investigation may be necessary.

Possible causes include:

Poor-quality charging cables

Loose USB connectors

Excessive current demand

Charger output limitations

Damaged charging accessories

Important: Voltage measurements alone cannot determine whether a charger is defective. Testing conditions, current demand and supported charging protocols must also be considered.

2. USB Charging Current Measurement

Charging current is another important parameter when diagnosing USB charging problems.

The FNIRSI FNAC-28 USB Current Tester allows users to monitor the current flowing between a USB power source and a connected device.

For example:

A smartphone connected to a charger may draw different current levels depending on battery charge, temperature, device activity and charging control.

If charging current is lower than expected, possible explanations include:

A nearly fully charged battery

Device temperature protection

Charger current limitations

USB cable resistance

Fast-charging compatibility issues

Therefore, USB charging current measurement is useful for troubleshooting, but it should always be interpreted together with voltage, charging conditions and device specifications.

3. USB Charging Power Measurement

Charging power is normally calculated using:

Power (W) = Voltage (V) x Current (A)

For example:

VoltageCurrentCalculated Power5V1A5W5V2A10W9V2A18W12V2A24W20V3A60W

These are illustrative calculations, not guaranteed FNAC-28 charging modes.

By monitoring USB charging wattage, users can better understand the power being delivered through a charging connection.

This is particularly useful when comparing different chargers or investigating why a device does not achieve its advertised charging speed.

4. USB Cable Quality and Resistance Testing

A charging cable can significantly influence USB charging performance.

Two cables may look identical but behave differently because of their internal conductor resistance, connector quality or construction.

The FNIRSI FNAC-28 USB Cable Resistance Testing function can help users compare the electrical performance of charging cables under suitable testing conditions.

Higher resistance may contribute to greater voltage drop when current flows through the cable.

For example, a cable carrying 2A with a resistance of 0.2 ohm would produce a theoretical voltage drop of:

Voltage Drop = 2A x 0.2 ohm = 0.4V

This demonstrates why cable resistance matters, especially during higher-current charging.

However, cable resistance measurements should be performed using the manufacturer's recommended procedure. Results may also be affected by connector contact resistance and the measurement setup.

5. Fast Charging Protocol Testing

Modern USB charging systems use different communication protocols to negotiate charging conditions.

The FNIRSI FNAC-28 Fast Charging Tester supports testing functions for selected charging protocols, including:

Qualcomm QC2.0 and QC3.0

Huawei FCP and SCP

Samsung AFC

Selected OPPO VOOC and related charging protocols

Actual protocol support and triggering behaviour depend on the instrument's firmware, connected charger and test configuration.

Important Limitation: The FNIRSI FNAC-28 should not be described as a full USB Power Delivery analyser. It does not provide the same PD active triggering and packet analysis capabilities as more advanced USB protocol analysers.

Technicians requiring detailed USB-C PD negotiation analysis should consider a tester specifically designed for that purpose.

6. Power Bank Output Testing

Power banks are commonly used for smartphones, tablets, portable electronics and travel accessories.

The FNIRSI FNAC-28 USB Tester can help users monitor power bank output voltage, current and power while a device or suitable electronic load is connected.

This can help investigate problems such as:

Unstable charging output

Unexpectedly low charging current

Charger and power bank compatibility

Differences between USB output ports

Charging power changes during operation

However, measuring output voltage and current does not automatically establish the complete battery capacity of a power bank.

Reliable capacity assessment requires an appropriate controlled discharge procedure and consideration of conversion losses.

7. Who Should Use the FNIRSI FNAC-28?

The FNIRSI FNAC-28 USB Tester Malaysia is suitable for several user groups.

Mobile Phone Repair Shops

Technicians can monitor USB charging behaviour when investigating charging accessories and power delivery problems.

Computer and Electronics Service Centres

Service personnel can compare USB power sources, charging cables and compatible portable devices.

Electronics Hobbyists

DIY users can observe USB voltage, current and power during electronics experiments.

Charger and Cable Sellers

Retailers can demonstrate selected charging performance characteristics and compare compatible accessories.

Technical Training Centres

Students can use USB measurements to understand basic electrical concepts such as voltage, current, power and resistance.

8. FNIRSI FNAC-28 vs Basic USB Tester

ComparisonBasic USB TesterFNIRSI FNAC-28Voltage MeasurementUsually AvailableAvailableCurrent MeasurementUsually AvailableAvailablePower MeasurementModel DependentAvailableCharging MonitoringLimited or Model DependentAvailableCable Resistance TestingOften Not AvailableAvailableFast Charging Protocol FunctionsOften LimitedSelected Protocols SupportedSuitable for Basic TroubleshootingYesYesAdvanced USB PD Packet AnalysisGenerally NoNo

The FNIRSI FNAC-28 provides more diagnostic functions than many entry-level USB voltage and current displays.

Nevertheless, buyers should select a tester based on their actual charging protocols, measurement requirements and technical applications.

9. Common USB Charging Problems in Malaysia

USB charging problems can occur in homes, offices, workshops and electronics service centres.

Common complaints include:

Problem 1: Smartphone Charging Too Slowly

Possible causes include an unsuitable charger, cable resistance, battery temperature or charging protocol incompatibility.

Problem 2: Power Bank Output Appears Weak

A USB tester can help check the actual output voltage and current under a connected load.

Problem 3: Charging Cable Works Intermittently

A damaged connector or poor electrical contact may cause unstable charging behaviour.

Problem 4: Fast Charging Does Not Activate

The charger, cable and device must support compatible charging methods. A USB tester can assist with preliminary investigation.

Problem 5: Charger Power Is Lower Than Advertised

Measured power depends on the connected device's demand and the negotiated charging mode. A lower reading does not necessarily mean the charger is faulty.

10. Is the FNIRSI FNAC-28 Worth Buying?

For users who regularly test USB chargers, charging cables and power banks, the FNIRSI FNAC-28 USB Tester offers a useful combination of portability and measurement functions.

Its main advantages include:

Compact and portable design

Voltage, current and power monitoring

USB cable resistance testing

Selected fast-charging protocol functions

Practical applications for electronics troubleshooting

However, it is important to understand its limitations.

The FNAC-28 is not a substitute for a laboratory-grade power analyser, complete USB-C PD protocol analyser or calibrated electronic load.

For routine USB charging investigation, it can nevertheless be a useful addition to an electronics technician's toolkit.

11. Where to Buy FNIRSI FNAC-28 USB Tester in Malaysia?

MTM Precision Sdn Bhd supplies electronic testing and measuring instruments for customers throughout Malaysia.

Customers looking for a FNIRSI FNAC-28 USB Tester in Malaysia can contact MTM Precision to enquire about product availability, pricing and suitable testing applications.

Our team can also assist customers in comparing different electronics testing instruments according to their requirements.

We serve customers in:

Kuala Lumpur, Selangor, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Kelantan, Terengganu, Perlis, Sabah and Sarawak.

Please contact us to confirm current stock and delivery arrangements.

Contact MTM Precision Sdn Bhd

For FNIRSI FNAC-28 USB Tester Malaysia, product enquiries and technical instrument recommendations:

MTM Precision Sdn Bhd

Showroom & Service Centre:

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia.

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my

Contact MTM Precision today for FNIRSI FNAC-28 availability, pricing and USB testing instrument recommendations in Malaysia.

Frequently Asked Questions

Q1. What does the FNIRSI FNAC-28 measure?

The FNIRSI FNAC-28 measures USB charging parameters including voltage, current and power. It also provides additional charging-related testing functions.

Q2. Can the FNIRSI FNAC-28 test USB-C chargers?

Yes, it includes USB Type-C connectivity for compatible charging measurements. However, it is not a full USB-C Power Delivery protocol analyser.

Q3. Can the FNIRSI FNAC-28 test charging cables?

Yes. Its cable resistance testing function can help compare charging cable electrical performance under suitable test conditions.

Q4. Can it test power banks?

Yes. It can monitor power bank USB output under appropriate loading conditions. Full capacity testing requires a suitable test procedure.

Q5. Is the FNIRSI FNAC-28 suitable for mobile phone repair?

Yes. It is useful for preliminary charging diagnostics, charger comparisons and USB cable troubleshooting.

Q6. Where can I enquire about FNIRSI FNAC-28 in Malaysia?

Contact MTM Precision Sdn Bhd in Puchong, Selangor, for pricing, availability and product enquiries.

Conclusion

The FNIRSI FNAC-28 USB Tester is a practical instrument for monitoring USB charging performance and investigating common charger, cable and power bank problems.

With voltage measurement, current monitoring, power calculation, cable resistance testing and selected fast-charging protocol functions, it provides useful capabilities for electronics technicians, service centres and DIY users.

For customers searching for a USB Charger Tester Malaysia, USB-C Power Meter Malaysia or FNIRSI FNAC-28 Malaysia, MTM Precision can assist with product enquiries and suitable instrument selection.