WG 5.6 – Human Metal Model (HMM) Device Testing

The WG reviewed the results of the ongoing multi-lab round-robin testing, to understand whether the use of ESD guns and HMM Pulsers provide the same results. The ESD gun results were consistent across all participating labs, while the results obtained with the HMM pulsers were less consistent across the participating labs. Additional data is being collected and the WG will continue to analyze the results further. The WG discussed whether source impedance measurements should be done on the ESD guns used in our multi-lab testing round, to better understand the results. This will be discussed further in future meetings.

The committee finalized planning of multi-lab experiments. The main goal of the experiments is to demonstrate the repeatability and reproducibility of HMM failure levels when using the setup of ESD SP5.6-2019. The WG also discussed possible updates to ESD SP5.6-2019 to make it more useful to the industry.

The working group provided an overview on current multi-lab experiments. The main goals of these experiments are to demonstrate the repeatability and reproducibility of HMM failure levels when using the setup of ANSI/ESD SP5.6-2019. Experiments are expected to start soon. The working group also discussed the future of HMM and the working group.

The WG reviewed the results of the multi-lab round robin testing.  The ESD results appeared to be consistent across all the participating labs, which was different from previous studies.  The results obtained on the different HMM pulsers were less consistent across the participating labs, which was unexpected.  Additional data is expected, and results will be further analyzed.

Source impedance measurements on the ESD guns used in the multi-lab testing was discussed.  Further data may be required.    

The WG reviewed the purpose of the ongoing multi-lab round-robin testing, as the question arose as to whether the results would be beneficial. Currently, some data still needs to be collected by a few sites, and new interested participants are welcome to join in the testing.

The WG reviewed the status of the contributions to the TR that is currently under development, highlighting some of the work done with the committee until now.

The WG is presently working on ESD TR5.6-01, which summarizes the knowledge collected in WG 5.6 throughout the years, including a summary of all round-robin/testing carried out. No further experiments are currently planned. It is the intention that WG 5.6 goes dormant after the TR has been published.

The WG reviewed the status of the TR being written and adjudicated comments from two reviewers.

• Section on frequency response to be added by the end of October.
• The WG decided to update the TR with existing comments and add the missing section before sending it out for more review, hopefully with more WG participation.

It was decided that after the TR is sent to TAS, the WG will review ESD SP5.6 to see if any updates are needed before the WG goes dormant once the TR is completed and published.

The WG reviewed the status of TR5.6-02-2X, which has undergone a TAS (Technical Advisory Subcommittee) review. An industry contributor requested and was granted permission to review the document, providing comments and suggestions, some of which involved advanced measurement techniques. It was decided to postpone incorporating these suggestions until after the TAS review to avoid delaying the document's progress. However, this will necessitate at least a second review by TAS.

The group also discussed the potential development of a document regarding using 50-ohm Human Metal Model (HMM) pulse sources. A WG member presented data from HMM pulse sources. Waveforms were compared to each other and to the analytical expression from IEC 61000-4-2. Despite extensive discussion, it was decided against pursuing a document specifically for 50-ohm HMM sources due to low anticipated industry adoption.

The working group reviewed the status of their TR on lessons learned, discussing TAS comments and feedback from an industry reviewer. The writing team provided an overview of the adjudication process for these comments and will determine if a full working group virtual meeting is necessary for further discussion. Once all comments are adjudicated, the TR will undergo a full review by the working group. Additionally, it was decided to include a brief section on advanced measurement techniques in response to feedback from the industry reviewer.

Summary of discussions/activities/document reviews:

• Review of the status of TR5.6-02 and decisions on TAS comments
• Explain the reason for 10 zaps for ESD Generator and 1 for the HMM Pulse Source
  • Smaller step size for HMM pulse sources
  • HMM SP should really call for 1 zap since it is not on a powered device
• Confusion over ESD Generator and HMM Pulse Source
  • Will add definitions for the two stress sources
• Need for more explanation of variability in 2011 RR
  • Will add sentence(s) to explain the possible interpretation of failure and include a device that failed for other than thermal damage
• Will not add an Annex on additional measurement techniques

The WG reviewed the planning and setup of multi-lab experiments. The main goals of these experiments are to demonstrate the repeatability and reproducibility of HMM failure levels when using the setup in ESD SP5.6.

Summary of meeting activities: 

The WG defined and agreed on a new multi lab testing round robin. Work on the peak temperature analysis methodology was applied to RF pins stressed with system-level ESD stress.