EX-R Series

Power, Precision, Simplicity

EX-R Series - mixed-mode regulated precision laboratory power supplies

EX-R Series - Model Range

Model

O/Ps

Voltage

Current Power

Aux. O/P

EX1810R

One 0 to 18V 0 to 10A 180W

EX355R

One 0 to 35V 0 to 5A

175W

EX2020R

One 0 to 20V 0 to 20A 400W

EX4210R

One 0 to 42V 0 to 10A 420W

EX354RD

Two 0 to 35V 0 to 4A

280W

EX354RT

Three 0 to 35V 0 to 4A

305W 1.5 -5V @5A

Related Models

EX752M

Two* 0 to 75V 0 to 2A

300W

* or single output of 75V/4A or 150V/2A

EX355P

35V/5A model with RS-232 interface

The new EX-R series has been extended by incorporating models from

the best selling EX series.

By adding four digit meters and switchable remote sensing, the EX-R

series offers much higher precision whilst retaining the simplicity of

operation which many bench-top power supply users prefer.

Six models are offered including single, dual and triple outputs and

covering a power range of 175 watts up to 420 watts.

Mixed-mode regulation

The EX-R series combines high frequency switch-mode pre-regulation

with linear post-regulation to provide performance that comes close

to that of an all-linear design.

Excellent line and load regulation is matched by low noise and good

transient response.

Four digit meters

The EX-R series incorporates separate voltage and current meters

on each main output with a resolution of 10mV and 1mA (10mA

on higher current models). 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 a 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*

Most EX-R series models use convection cooling and are entirely free

of fan noise. * The highest power density models, EX2020R and EX4210R, use

an intelligent fan for cooling.

Safety binding-post terminals

EX-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

EX-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.