Test equipment for simulating supply voltage variations - also simulates intermittent failure and provides AC and DC voltages dynamically variable under program control

摘要

The test equipment is for supplying either alternating or direct voltages which can be varied under a programme controller to examine the behaviour of equipment being tested under conditions of supply voltage intermittency or variation. The equipment comprises two main channels, one for providing a variable, programmed alternating voltage (A1) and the other for providing a variable programmed direct voltage (A2). In the case of the alternating voltage, an input alternating voltage (E1) is fed to three variable ratio transformers (N1W, N2W, N3W) the outputs of which are set to suitable values. These outputs are fed to the equipment output (A1) via switches (S1W, S2W, S3W) in a sequence controlled by a programme control unit incorporating an input voltage monitor (UW), a clock generator (TG) and selector counter (VW). Intermittent voltage failure can be simulated by setting one of the transformer outputs to zero.