Test Equipment for Traffic Signal Control Systems

LST 650

Load Switch Tester

PCMT 8000

The LST-650 NEMA Load Switch Tester (Tester) is an automated tester designed to test Load Switches
used in traffic signal installations conforming with NEMA Specifications.
The Tester performs a quick functional test of the Load Switch under simulated normal conditions. The
following parameters are tested:
● DC input turn-on and turn-off voltage
● DC input maximum turn-on current
● AC output turn-on and turn-off voltage
● AC output leakage current
● AC output turn-on and turn-off time

The Tester connects to a Windows based computer with a USB connection. The LST-650 Test Manager software controls the Tester and allows the users to run manual or automated tests.

NOTE: The LST 650 performs functional testing. It does not test to the limits of the NEMA standard. The AC loads are approximately 240W and 12W depending on line voltage fluctuations.

Athens Technical Specialists, Inc.