A Comprehensive Guide to Heavy-Hammer Surface Resistance Testers

2025-11-12 15:15:48

Hammer-Type Surface resistance tester is a critical tool in the field of electrostatic discharge (ESD) protection, used for precisely evaluating the anti-static properties of materials. Below is a comprehensive guide to help you fully understand it.

Working Principle & Core Functions

The hammer-type surface Resistance Tester operates based on Ohm’s Law (R = V/I). It applies a known test voltage (typically 10V or 100V) to the material surface via weighted probes and measures the微弱 current flowing through to calculate the resistance value.

Key functions include three measurement modes compliant with ESD association standards:

1. Surface Impedance: Evaluates the conductivity of a material’s surface using parallel electrodes or concentric ring probes.

2. Point-to-Point Resistance: Measures the resistance between any two points on a surface, reflecting its ability to dissipate static electricity.

3. Surface-to-Ground Resistance: Assesses the electrical connection quality between a workspace surface (e.g., bench mat) and ground to ensure safe static discharge.

Additionally, these testers often integrate temperature and humidity sensors, as environmental conditions significantly impact resistance values. Recording these parameters during measurement is essential.

Standard Operation & Daily Maintenance

Accurate data depends on proper operation and upkeep.

Pre-Measurement Preparation:

• Ensure the surface is clean and dry, free from dust, oil, or other contaminants that affect conductivity.

• Check the conductive rubber on the bottom of the weighted probes for integrity and cleanliness.

Standard Measurement Steps:

1. Place two weighted probes on the surface with a specified spacing (typically 10–30 cm).

2. Power on the instrument and wait for temperature/humidity readings to stabilize.

3. Select the appropriate test voltage (10V or 100V). For high-impedance materials, 100V is typically used for better accuracy.

4. Press and hold the measurement button for about 15 seconds until the reading stabilizes. Avoid touching metal parts or cables during testing to prevent interference.

Daily Maintenance Tips:

• Battery Management: Monitor low-battery indicators and recharge or replace batteries promptly. For long-term storage, recharge every three months.

• Probe Care: Regularly clean the conductive rubber with alcohol-soaked cotton swabs. Avoid scratching with hard objects.

• Calibration: To ensure accuracy, calibrate the instrument periodically, typically every 12 months.

 Applications & Industry Standards

These testers are widely used in static-sensitive industries:

• Electronics Manufacturing: Testing ESD workbenches, floors, garments, and wrist straps to ensure they function within effective ranges.

• Pharmaceuticals & Chemicals: Monitoring static dissipation capabilities in flammable or explosive environments to ensure safety.

• Quality Inspection: Verifying that purchased anti-static materials meet specifications during incoming checks.