AIM & THURLBY THANDAR INSTRUMENTS EL-R & EX-R Series Precision laboratory power supplies - single, dual and triple outputs EL-R Series - linear regulated - 30 watts to 130 watts EX-R Series - mixed-mode regulated - 175 watts to 420 watts compact size, silent cooling, 4 digit meters, remote sense also covers EL302P, EX355P, EX752M aimtti.comEL-R Series - linear regulated precision laboratory power supplies EL-R Series Simplicity with Precision The new EL-R series has been developed from the top selling EL series. By adding four digit meters and switchable remote sensing, the EL-R series offers much higher precision whilst retaining the simplicity of operation which many bench-top power supply users prefer. Eight models are offered including single, dual and triple outputs and covering a power range of 30 watts up to 130 watts. Linear regulation All EL-R series models* use true linear regulation for the best possible performance. Excellent line and load regulation is matched by very low output noise and good transient response. Four digit meters The EL-R series incorporates separate voltage and current meters on each main output with a resolution of 10mV and 1mA. The fixed resolution avoids the misinterpretation of readings that can occur with auto-ranging 3 or 3 digit meters where the decimal point position moves as the reading changes. Remote Sensing Each main output incorporates remote sense terminals that can be enabled or disabled at the flick of a switch. Remote sensing is essential for maintaining precise regulation at the load 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. N.B. A 2 metre length of a 24/0.2 wire pair has a resistance of around 0.1 W. For a 5V load drawing 3A the metering error without remote sense would be 0.3V and the effective full current load regulation would be around 6%, against a quoted figure of perhaps 0.01% for the power supply itself. DC output switches Each main output has a DC on-off switch. This enables voltage and current settings to be viewed before the load is connected and allows multiple outputs to be controlled individually. Surprisingly, many power supplies omit this essential feature. Constant voltage or constant current EL-R Series - Model Range Model O/Ps Voltage Current Power Aux. O/P Each main output can operate in constant voltage or constant current EL301R One 0 to 30V 0 to 1A 30W mode with automatic crossover and mode indication. Coarse and EL183R One 0 to 18V 0 to 3.3A 60W fine voltage controls are provided. The current control is logarithmic EL302R One 0 to 30V 0 to 2A 60W enabling low current levels to be set accurately. EL561R One 0 to 56V 0 to 1.1A 60W Silent cooling EL155R One 0 to 15V 0 to 5A 75W All EL-R series models use convection cooling and are entirely free of EL303R One 0 to 30V 0 to 3A 90W EL302RD Two 0 to 30V 0 to 2A 120W fan noise. EL302RT Three 0 to 30V 0 to 2A 130W 1.5 - 5V 2A Safety binding-post terminals Related Models EL-R series power supplies are fitted with the new TTi designed EL302P 30V/2A model with RS-232 interface output terminals. These can accept a 4mm safety plug with rigid insulating sleeve, a requirement specified by an increasing number of Simplicity in use laboratories for safety reasons. EL-R series power supplies use classic analog controls for However, unlike the 4mm safety sockets used on some other products, voltage and current. the new TTi terminals can also accept fork connectors or bare wires, The large and bright displays have a fixed resolution to avoid giving maximum connection flexibility. confusion. Preset voltage and current levels are shown when the DC output switch is turned off. Remote sense is available when needed but is disabled by setting the switch to Local.