美国Qualmark Corporation  www.qualmark.com
美国QUALMARK Corporation 公司的 HALT/HASS (高加速寿命测试/高加速应力筛选）设备
Qualmark Corporation was founded in 1991 as a specialty manufacturer of accelerated stress equipment. Qualmark’s products and services are designed and refined as a result of continual and extensive research and development. 
Qualmark has since evolved into a full service, global organization offering:
HALT/HASS Systems and Electrodynamic Shakers 
Slip tables 
Components, Parts, Repair and Services 
Test Lab Services 
Training Programs 
Project Management 
Today, more than ever, testing programs are driven by market demand to provide reliable products whose timely releases keep pace with technology advancements. Qualmark’s continued growth, both organically and through acquisition, reflects our commitment to offer relevant solutions for customers caught in an increasingly competitive marketplace.
HALT HASS Systems
Our HALT/HASS equipment is the best-selling line in the world and allows design labs to ensure robust product designs and production-line managers to eliminate all failure modes before products are shipped. Qualmark also offers a rich array of training and consulting services in the areas of accelerated testing and product design improvement.
With more than 4,000 tests conducted in Qualmark's lab facilities, and installation and maintenance of over 700 chambers in 36 countries, Qualmark has earned the position as the Knowledge Leader in Accelerated Testing Methods.
Electrodynamic Shakers - Ling Electronics & ACG
Ling Electronics is one of the nation's most experienced manufacturers of vibration, shock test systems and fixtures. There are over 4,000 electrodynamic shaker systems installed worldwide by Ling and its subsidiaries. Serving an international cross-section of governmental, industrial and scientific markets, Ling has been a leading manufacturer of Vibration and Acoustic Testing Systems for over 45 years. 
 
Ling Electronics, a Qualmark Company, manufactures standard electrodynamic vibration test systems and provides Qualmark with the unique capability to also support standard MIL SPEC and qualification vibration testing requirements. 
ACG Dynamics, also a Qualmark Company, can service, rebuild and refurbish all domestic brands of electrodynamic shaker vibration test systems. This combination of support for our customers is unmatched by any other competitor. 
Kimball Industries has been in the business of designing and producing slip tables, load supports, fixtures and head-expanders for nearly 45 years. Their products round out the Ling and ACG ED shakers, giving our customers complete ED testing packages from a single vendor. 
Derritron amplifiers and low-force shakers are known throughout the world as being best-in-class. In April of 2007, these product lines joined those of the other Qualmark companies under the Ling Electronics name.