**“TD”® Tweezers – Quality Assurance Class 0 CDM Test Procedures**

- TDI meets all of the criteria for ESD Testing, as proposed by IDEMA.
- All of these testing procedures are performed internally, including critical “Transient Current Discharge” testing.

**POINT-TO-POINT-RESISTANCE**

- Resistance Between Tip Top and Bottom (Tip Without Handle)
- Resistance Between Handle and One Tip at A Time
- Surface Resistance 100% Inspection
- Automatic PASS/FAIL Signal

**The acceptance limits have been defined as follows:**

- Low Resistance Limit: 1 x 10
^{6}Ohm/high resistance limit: 1 x 10^{8}Ohm for 50 and 100V - Low Resistance Limit: 1 x 10
^{7}Ohm/high resistance limit: 1 x 10^{9}Ohm for 10V

**STATIC DECAY ANALYSIS**

The time to discharge a 20pf isolated metal plate previously charged to 1000 Volts to less than 10 Volts is measured. During the 1000 Volt discharge, sparks should not be observed. The decay curves should have a correct exponential course.

**The acceptance limits defined as follows:**

- Residual Voltage < 3 Volt
- Decay Time < 500 m/second

**TRIBOELECTRIC CHARGE DETERMINATION**

The purpose of this discharge test is to measure any residual charges on the tweezers following normal grounding procedures as shown.

**The acceptance limits defined as follows:**

- Residual Voltage < 3 Volt

- Resistance Between Tip Top and Bottom (Tip Without Handle)
- Resistance Between Handle and One Tip at A Time
- Surface Resistance 100% Inspection
- Automatic PASS/FAIL Signal

**The acceptance limits have been defined as follows:**

- Low Resistance Limit: 1.1006 Ohm/high resistance limit: 1.1008 Ohm for 50 and 100V
- Low Resistance Limit: 1.1007 Ohm/high resistance limit: 1.009 Ohm for 10V

**STATIC DECAY ANALYSIS**

The time to discharge a 20pf isolated metal plate previously charged to 1000 Volts to less than 10 Volts is measured. During the 1000 Volt discharge, sparks should not be observed. The decay curves should have a correct exponential course.

**The acceptance limits defined as follows:**

- Residual Voltage < 3 Volt
- Decay Time < 500 m/second

**TRIBOELECTRIC CHARGE DETERMINATION**

The purpose of this discharge test is to measure any residual charges on the tweezers following normal grounding procedures as shown.

**The acceptance limits defined as follows:**

- Residual Voltage < 3 Volt

**TRANSIENT CURRENT DISCHARGE ANALYSIS**

MR circuits utilized in Disk Drive Assemblies are highly static sensitive in both current and voltage ESD discharge environments.

TDI “TD”® Polymer Tweezers were developed to provide the lowest discharge parameters, as measured by Transient Current Discharge procedures defined by the Disk Drive Industry. TDI meets the critical Transient Current Discharge parameters for each Disk Drive Customer’s specifications.

The Direct Charged Device Model (DCDM) was chosen to as methodology to determine the transient peak current which occurs during the discharge of a charged object through a dissipative tip tweezers.

**Transient Current Determination Methodology**

**Test Procedure**