Geevorks MESR-100 V2 Capacitor Tester User Manual

1. Introduction

The Geevorks MESR-100 V2 is an auto-ranging capacitor ESR (Equivalent Series Resistance) and low Ohm meter designed for measuring the internal series resistance of capacitors. This device operates at 100kHz to effectively remove impedance, allowing for accurate measurement of the real series resistance. It is particularly useful for in-circuit testing, applying less than 15mV DC or peak-to-peak to prevent damage to components. This manual provides detailed instructions for the proper use, maintenance, and troubleshooting of your MESR-100 V2.

Figure 1: MESR-100 V2 Capacitor Tester with included accessories.

2. Safety Information

Please read and understand all safety warnings and operating instructions before using this device. Failure to do so may result in injury or damage to the meter or the circuit under test.

• Always ensure the capacitor under test is fully discharged before connecting the meter. Residual charge can damage the device or cause electric shock.
• Do not attempt to measure live circuits with high voltage. This device is designed for low-voltage in-circuit testing.
• Do not expose the device to moisture or extreme temperatures.
• Use only the provided test leads and SMD clip.
• If the device shows signs of damage, do not use it.

3. Product Overview & Components

Familiarize yourself with the different parts of your MESR-100 V2 Capacitor Tester.

Figure 2: Front view of the MESR-100 V2 with labeled components.

1. Model Display: Shows the device model.
2. Power Switch: Turns the device on/off.
3. Negative Jack: Connection point for the negative test lead.
4. Capacitance Direct Socket: For direct insertion of capacitor leads.
5. Zero Button: Used to calibrate the meter to zero before measurement.
6. Mode/Range Button: Switches between measurement modes or ranges.
7. Positive Jack: Connection point for the positive test lead.
8. ESR Specifications Table: Printed table for quick reference of typical ESR values for electrolytic capacitors at various voltages.

Figure 3: SMD Test Clip for precise measurements on small components.

4. Setup

Before first use, ensure the device is ready for operation.

4.1 Power Source

The MESR-100 V2 is battery-powered. Ensure the battery is charged. The device features a micro USB port for charging.

Figure 4: Micro USB charging port.

4.2 Connecting Test Leads

Insert the red test lead into the positive jack and the black test lead into the negative jack. For SMD components, attach the SMD clip to the test leads.

5. Operating Instructions

5.1 Powering On and Zeroing

1. Press the Power Switch to turn on the device.
2. Before each measurement, especially when changing test leads or environment, short the test leads together (or insert nothing into the direct socket) and press the Zero Button. This calibrates the meter to compensate for lead resistance, ensuring accurate readings. The display should show '0.000R'.

Figure 5: Zero and Mode/Range buttons for operation.

5.2 Taking Measurements

The MESR-100 V2 is auto-ranging, simplifying operation. It measures ESR from 0.001Ω to 100.0Ω.

1. Ensure the capacitor or component is fully discharged.
2. Connect the test leads or SMD clip to the component. For in-circuit testing, ensure good contact with the component's terminals.
3. Read the ESR value displayed on the screen.
4. Compare the measured ESR value with the typical values provided in the ESR Specifications Table printed on the device or in Section 5.3.

5.3 Understanding ESR Readings and ESR Table

ESR (Equivalent Series Resistance) is a critical parameter for evaluating the health of electrolytic capacitors. A higher-than-expected ESR value often indicates a faulty or degraded capacitor.

Figure 6: Standard Worst-Case Electrolytic Capacitor ESR Table.

The table provides typical maximum ESR values for various capacitance and voltage ratings. If your measured ESR is significantly higher than the value in the table for a capacitor of the same type, capacitance, and voltage, the capacitor may be faulty.

Note: This Capacitance Meter is used for testing the internal resistance (ESR) of the capacitor, not for testing its capacitance value.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
• Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• Battery: Recharge the battery regularly, especially if the device will not be used for an extended period.

7. Troubleshooting

8. Specifications

Figure 7: Device dimensions.

9. What's in the Box

The package includes the following items:

• 1 x Geevorks MESR-100 V2 Capacitance Meter
• 2 x Test Clips (Red and Black)
• 1 x SMD Clip
• 1 x User Manual (this document)

10. Warranty and Support

For warranty information and technical support, please refer to the product's purchase platform or contact Geevorks customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.