1. Introduction
The diymore MK-328 is a versatile component tester designed for quick and accurate measurement of various electronic components. It can identify and test resistors, capacitors, inductors, diodes, and different types of transistors including NPN, PNP, MOSFETs, and JFETs. This manual provides detailed instructions for the safe and effective use of your MK-328 tester.
2. Key Features
- Measures current amplification factor and base-emitter threshold voltage of bipolar transistors.
- Detects and verifies protection diodes in bipolar transistors and MOSFETs.
- Measures gate threshold voltage and gate capacitance value of MOSFETs.
- High-resolution resistance measurement: 0.1 ohms, up to 50 M Ohms.
- Displays up to two diodes with correct symbol and order.
- Automatic detection of NPN and PNP bipolar transistors, N-channel and P-channel MOSFETs, JFETs, diodes, double diodes, thyristors, and triacs.
- Automatic pinout detection.
3. Technical Specifications
| Parameter | Value |
|---|---|
| Display | 128 x 64 LCD backlight |
| Input Voltage | 9V |
| Operating Current | Approx. 20mA |
| Power Supply | 1 x 9V battery (not included) |
| Resistance Measurement Range | Max. 50 MΩ |
| Resistance Resolution | 0.1Ω |
| Capacitance Measurement Range | 25pF - 100mF |
| Capacitance Resolution | 1 pF |
| Inductance Measurement Range | 0.01mH - 20H |
| Screen Size | 5 x 2.7 cm (1.97 x 1.06 in) |
| Product Dimensions | 15 x 8 x 3.5 cm (5.9 x 3.15 x 1.4 in) |
| Product Weight | 188g (6.65 ounces) |
| Dissipation Power | 0.18W |
| Operating Temperature | -20°C to 65°C |
| Type | Module |
| Application | Capacitor, Resistor, Transistor Testing |
4. Package Contents
Upon opening the package, ensure all items are present and in good condition:
- 1 x MK-328 Transistor Tester Unit
- 1 x Set of Test Clip Cables (Red, Yellow, Green)
5. Setup
5.1. Battery Installation
- Locate the battery compartment on the back of the MK-328 tester.
- Open the battery cover.
- Insert a new 9V battery, ensuring correct polarity.
- Close the battery cover securely.
5.2. Connecting Test Clips
The tester comes with a set of test clip cables for connecting components. These clips connect to the three labeled DUT (Device Under Test) ports (1, 2, 3) on the front panel.
6. Operation
6.1. General Testing Procedure
- Ensure the 9V battery is installed.
- Connect the component to be tested to the appropriate test points. You can use the ZIF (Zero Insertion Force) socket for components with leads or the test clips for larger or irregularly shaped components.
- Press the red 'TEST' button to initiate the measurement.
- The LCD will display the component type, pinout, and measured values (e.g., resistance, capacitance, voltage drop).
6.2. Using the ZIF Socket
For components like transistors, diodes, or small ICs with standard pin spacing, the ZIF socket provides a convenient connection method. Insert the component leads into the corresponding holes (1, 2, 3) on the ZIF socket and close the lever to secure them.
6.3. Capacitor Measurement Precaution
WARNING: Before measuring any capacitor, it must be fully discharged. Failure to discharge capacitors can very likely damage the tester.
The tester includes a warning label: "Discharge capacitor before measuring." Always adhere to this safety instruction.
7. Maintenance
- Keep the device clean and dry. Avoid exposure to dust, moisture, and extreme temperatures.
- When not in use for extended periods, remove the 9V battery to prevent leakage.
- Clean the display and casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Handle the test clips and ZIF socket with care to prevent damage to the contacts.
8. Troubleshooting
8.1. Device Does Not Power On
- Check if the 9V battery is correctly installed with the right polarity.
- Replace the 9V battery with a new one if the current battery is depleted.
8.2. Incorrect Readings or No Detection
- Ensure the component leads are making good contact with the ZIF socket or test clips.
- Verify that the component is not damaged or short-circuited.
- For capacitors, ensure they are fully discharged before testing. High voltage from charged capacitors can damage the tester.
- Check the battery level; low battery can affect measurement accuracy.
8.3. Display Issues
- If the display is dim or flickering, replace the 9V battery.
- Ensure the screen is clean and free from obstructions.
9. User Tips
- Component Identification: This tester is excellent for quickly identifying unknown components and their pinouts, which is very helpful for hobbyists and professionals working with salvaged parts.
- Generic Design: The MK-328 design is widely adopted and often sold by various brands. Focus on the tester's functionality and performance rather than specific branding, as the core capabilities are generally consistent across manufacturers.
- Battery Life: To prolong battery life, consider removing the battery if the tester will not be used for several days or weeks.
10. Warranty and Support
For any issues not covered in this manual or for warranty inquiries, please contact the seller or manufacturer directly. Keep your purchase records for reference.
