EL-R Series Simplicity with Precision
EL-R Series – linear regulated precision laboratory power supplies EL-R Series – Model Range Model O/Ps Voltage Current Power Aux. O/P EL301R One 0 to 30V 0 to 1A 30W EL183R One 0 to 18V 0 to 3.3A 60W EL302R One 0 to 30V 0 to 2A 60W EL561R One 0 to 56V 0 to 1.1A 60W EL155R One 0 to 15V 0 to 5A 75W EL303R One 0 to 30V 0 to 3A 90W EL302RD Two 0 to 30V 0 to 2A 120W EL302RT Three 0 to 30V 0 to 2A 130W 1.5 – 5V @2A Related Models EL302P 30V/2A model with RS-232 interface 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. ELR
Linear regulation ELR
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 3½ digit meters where the decimal point position moves as the reading changes.
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.