4
2.0 TEST
METHODS
2.1 ANSI/ESD STM11.31-2006 ESD Association standard for
evaluating the performance of electrostatic discharge shielding
materials - Bags
This test method evaluates the performance of electrostatic discharge shielding
bags. The purpose of this standard is to ensure that testing laboratories, using
this test method to evaluate a given packaging material, will obtain similar
results. This standard specifies the discharge waveform characteristics, probe
configuration, probe capacitance and bag size. Figure 2.0-1 shows the generic
schematic of the test system.
Figure 2.0-1: System generic schematic
Figure 2.0-2 shows the discharge current waveform requirement at the specified
1000 Volts when measured through a 500 Ohm resistor.
Figure 2.0-2: Discharge waveforms per ANSI/ESD STM5.1
The current pulse detected between the upper and lower electrodes of the
capacitive probe is used to calculate the energy inside the bag by integrating the
area under the curve as shown in Figure 2.0-3.
