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The new PLH Series of laboratory bench DC power supplies from Thurlby Thandar Instruments (TTi) comprises high-voltage linear regulated units offering a maximum output voltage of either 120V or 250V.

Based around the format of the company’s new PL Series of lower-voltage power-supply units, the PLH Series provides a maximum power of more than 90W from an ultra-compact casing, which measures 107mm in width (one quarter rack width).

The linear regulation ensures low noise and a fast transient response along with a benign response to complex load conditions.

The maximum current output is 750mA or 375mA, depending on the model, with a measuring resolution of 0.1mA.

A low-current range of 75mA is also provided, which increases the resolution to 0.01mA and enables low currents to be accurately set in constant-current operation.

The PLH incorporates smart analogue controls.

Voltage and current are set using conventional rotary knobs, but the settings can be locked at the touch of a button using the S-Lock function, which transfers the control of voltage and current from the analogue controls to internal digital circuitry.

This arrangement offers both security and stability, with each setting controlled by a high-resolution instrumentation-quality digital-analogue convertor, according to TTi.

The V-Span function allows the user to redefine the end-stop values of the voltage control to create a specific voltage range.

When working with any particular piece of equipment, engineers often require a voltage source variable over only a narrow range.

V-Span enables a complete 300deg rotation of the voltage control to cover whatever voltage range the user requires.

Special safety binding post terminals, designed by TTi, are used.

These are touch proof to more than 250V and can be used with fixed shroud 4mm plugs for laboratories that make their use mandatory.

However, they can also accept standard 4mm plugs, spade connectors or bare wires for general-purpose use.

Thurlby Thandar Instruments

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