Test data drifting? Retest costs adding up? See the fix live in Shanghai this June.

2026/05/12

One of the most overlooked cost drivers in HVAC calorimeter and enthalpy-method testing labs isn't the equipment itself. It's unstable power quality. Grid interference causes test data deviation, and every retest compounds time and labor costs directly.

Preen high-power programmable power supplies deliver pure sine wave output with THD as low as 0.3%, effectively isolating grid interference, improving measurement accuracy, and eliminating reverse interference from the DUT back into the grid. They are compliant with multiple ISO international test standards. This June, we're bringing our flagship products: the AFV-P Programmable AC Power Supply and ADG-L Programmable DC Power Supply to the show floor with live demos at our booth. Book a session with our technical team in advance to secure your slot.

∎AFV-P Programmable AC Power Supply

Precision control & high compatibility, tailor-made for industrial pneumatic systems.

・Maximum output voltage up to 310 V; upgraded version reaches 350 V, maximum frequency up to 2000 Hz

・Harmonic distortion as low as ≤ 0.3% with low interference, ideal as a standard source for testing and verification

・Supports single or continuous test procedures such as voltage and frequency soft rise, soft fall and step change, facilitating verification of equipment power input reliability

・4.5/9 times peak current, suitable for devices under test with inrush current

・Compliant with EMC limit requirements of IEC61000-3-2 / GB 17625.1

∎ADG-L Programmable DC Power Supply

High efficiency & stability with wide-range adaptation, a core testing device for the industrial power sector.