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.

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 3½ 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

Each main output can operate in constant voltage or constant current

mode with automatic crossover and mode indication. Coarse and

fine voltage controls are provided. The current control is logarithmic

enabling low current levels to be set accurately.

Silent cooling

All EL-R series models use convection cooling and are entirely free of

fan noise.

Safety binding-post terminals

EL-R series power supplies are fitted with the new TTi designed

output terminals. These can accept a 4mm safety plug with rigid

insulating sleeve, a requirement specified by an increasing number of

laboratories for safety reasons.

However, unlike the 4mm safety sockets used on some other products,

the new TTi terminals can also accept fork connectors or bare wires,

giving maximum connection flexibility.

Simplicity in use

EL-R series power supplies use classic analog controls for

voltage and current.

The large and bright displays have a fixed resolution to avoid

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.