HALT Testing Systems

The technology has matured from a simple thermal shock chamber with a vibration table to an integrated testing system. GRANDE chambers have been the market leader in HALT since introducing the technology in the early 1990s. Today, our technology continues to reflect the best advances in HALT/HASS system testing. Our models are the most energy-efficient on the market. The technology provides the extreme stresses necessary to rapidly find design flaws missed by traditional methods.
The table delivers six-degree-of-freedom, random, broadband excitation (10 Hz to above 5,000Hz) with a consistent power spectral density profile that eliminates "picket fencing." The thermal chamber's conditioning system features vacuum-jacketed liquid nitrogen cooling and nichrome wire heating, resulting in ramp rates of  60 to 100˚C per minute.
Features

GRANDE Vibration Technology: 6DOF repetitive-shock table

Simultaneous excitation at multiple frequencies for testing complex assemblies

Patented pneumatic hammer/table design is lubrication-free and valvelessQuiet operation without external cooling requirements

The table is field-adjustable for resetting to original PSD levels, ensuring consistent performance. (Adjustment included in our preventative maintenance agreement.)

Cooling System

Vacuum Jacketed (VJ) liquid nitrogen (LN2) valves and manifold.

Proportional control and valve system for maximum LN2 efficiency and consistent temperature control, while reducing two-phase (gas/liquid) states that cause problems in traditional on/off solenoid-based control.

VJ eliminates condensation, dripping water, OSHA safety concerns, and energy loss compared to other insulation methods.

Efficient, economical LN2 usage with either low-pressure Dewar tanks or higher pressure Permacyl and bulk tank systems.
Chamber Design

Stainless steel interior, painted exterior, with two full opening doors

High-velocity airflow for improved product temperature change rates

Two-position table for flexibility to test taller samples, improved ergonomics, and less LN2/electricity usage for smaller test items

Advanced chamber insulation combined with our low-noise hammers results in very quiet operation, even at maximum vibration levels.

Adjustable feet for leveling unit.

Control System

Windows 10 system with Labview based operation and PLC-based controlsProgramming, operation, and datalogging for vibration/thermal profiles.

One accelerometer for table control (three additional inputs available)Two thermocouples: one for product, one for air (four additional inputs available)

Eight event relays for external controls

Optional integrated spectrum analyzers and data acquisition systems.