"Industry Standard" laboratory PSU range 32V/2A Triple ; LED displays Wide model range, single, dual or triple outputs Separate digital meters for voltage and current Twin 3¾ digit meters with 12.5mm LEDs 0.1% accuracy, 10mV and 1mA resolution Parallel, series and tracking modes on duals/triples High current 5V logic output on triples
The Thurlby Thandar PL series of laboratory bench power supplies has established itself in many countries as an “industry standard” range.
Digital accuracy and convenience PL series units incorporate digital meters with a 3.75 digit scale length (4095 counts) to provide greater accuracy and resolution than other PSUs. Large and bright LEDs give a clear and unambiguous reading. An update rate of 4 per second provides near instantaneous response. Separate meters are used for voltage and current, eliminating the need for meter function switches with their attendant problems of misinterpretation. A damping switch for the current meter simplifies measurements on rapidly varying loads.
Remote sense for precision at high currents Remote sense terminals enable the precision to be maintained at high currents by eliminating the effects of connection lead resistance. Without remote sense lead resistance of just a few tens of milliohms can seriously degrade regulation and produce misleading results. (Two cables of 0.05W each will drop a total of 0.3V at 3 Amps.)
PL320QMT Variable output voltage (4V to 6V) and variable current limit (0.1A to 4A). Calibrated voltage control. Remote sense terminals, DC output switch, over-voltage trip.
Safety and protection PL series PSUs are designed and built to meet the stringent requirements of IEC348 and IEC1010. All outputs are fully protected against short circuit, reverse voltage and reverse currents.
Greater resolution and control The PL series sets the standard for simple and comprehensive control. Voltages are set with coarse and fine controls for speed with precision. Currents are set with a semi-logarithmic control for increased resolution at low current levels. The DC output switch enables voltage and current levels to be set before the load is connected. With the output switch “off” the the current limit set point is displayed. With the output switch “on” the actual output current flowing is displayed. This invaluable feature allows delicate circuits to be protected by accurately setting the current limit level (down to a few milliamps if necessary) before connecting the circuit under test. Quad-mode duals and triples The 32V-2A and 32V-3A supplies are each available as a dual unit incorporating push button selection of four modes of operation:
Isolated - 2 x single outputs
True Parallel - The Master acts as a single supply of twice the current capability.
Series - Outputs connected in series but with independent control.
Series Tracking - As series but both voltages are set with the Master voltage control.
Each of the quad-mode dual models is alternatively available as a triple supply incorporating one further independent output. This is a higher current 5 Volt output intended for powering logic circuits. The current rating and sophistication of the logic output varies according to the model as follows: