Athens Technical Specialists, Inc. 

The CMU and the HDSP both perform critical roles in the ATC Cabinet monitoring system.


Unless the CMU receives accurate voltage and current data from each HDSP, it will not be able to properly detect an unsafe condition. Therefore, it is essential for a testing program to include both devices.



The CMU is the primary component of the ATC Cabinet monitoring system. Proper functioning of the CMU is of critical importance if safe operation of the cabinet is to be maintained. If the CMU is not functioning properly, a cabinet malfunction may go undetected, putting the public at great risk. This is why it is important to conduct periodic testing of each CMU.

The ACMT-5000 CMU Tester will run a series of comprehensive tests on the CMU to verify that it is functioning in compliance with the published standard. The tester is compatible with both the high voltage and low voltage CMU models (CMU-2212-HV and CMU-2212-LV). The CMU under test plugs into a slot in the front of the tester. No external cables or fixtures are required.

The tester connects to a PC or laptop with a USB connection. After each CMU test, a detailed test report is generated in PDF format. The test report may be saved in long detailed format or in a condensed version.The tester is housed in a standard 19" rackmount type enclosure. Optional rugged carrying cases are available for ease of transport when testing at the intersection.

Test Equipment for Traffic Signal Control Systems