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The EL302RT from TTi is a triple-output laboratory power supply that incorporates switchable remote sense terminals that enable the output voltage to be controlled at the load end.

Remote sensing is essential to maintaining precise regulation and true metering of the load voltage.

Many other power supplies omit remote sense, and quote regulation figures that could never be achieved in practice.

For example, a 2m length of a 24/0.2 wire pair has a resistance of around 0.1 ohm.

For a 5V load drawing 3A, the metering error would be 0.3V and the effective full-current load regulation would be around six per cent, against a quoted figure of perhaps 0.01 per cent for the power supply itself.

The EL302RT has two independent and isolated outputs of 0-30V at 0-2A.

Separate four-digit meters are provided for voltage and current on each main output to a resolution of 10mV and 1mA.

Linear regulation provides low output noise and good transient response.

The outputs can operate in constant-voltage or constant-current mode with automatic crossover.

The third output is intended primarily for low-voltage logic and is variable between 1.5V and 5.0V with a fixed current limit of 2A.

The voltage can be accurately preset using the voltage meter from the second output.

The EL302RT incorporates safety binding-post output terminals that can accept a 4mm safety plug with rigid insulating sleeve, a requirement specified by an increasing number of laboratories for safety reasons.

Unlike the 4mm safety sockets used on some other products, the TTi terminals can also accept fork connectors or bare wires, giving maximum connection flexibility.

The power supply is compact, measuring 260 x 160 x 295mm.

Cooling is done by convection, which ensures that the unit is silent in operation.

Thurlby Thandar Instruments

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