EL and EX series DC bench PSUs

compact bench power supplies offering an unrivalled combination of performance and value

CYAN MAGENTA YELLOW BLACK

EX - high power with high performance

The EX series provides high levels of power (up to 305 watts) in a

compact and attractive case style.

Switch-mode pre-regulation is combined with linear post-

regulation to provide performance comparable with an all linear

design.

Excellent line and load regulation is matched by low noise and

good transient response. High power efficiency makes fan cool-

ing unnecessary.

EX series - initial model range

Model

O/Ps

V max. / A max.

Power

EX355

1

35V/5A

175W

EX354D

2

2 x 35V/4A

280W

EX752M

2

2 x 75V/2A

or 75V/4A or 150V/2A

300W

EX354T

3

2 x 35V/4A + 5V/5A

305W

Single, dual or triple outputs

EX series units are available in single, dual or triple output ver-

sions.

The EX354D, for example, has two independent and isolated out-

puts each witha0to 35V, 0 to 4A capability. The outputs operate

in constant voltage or constant current mode with automatic

crossover and mode indication. Each output has its own on-off

switch.

The outputs can be wired in either series or parallel to provide volt-

ages up to 70 volts or currents up to 8 amps.

The EX354T has an additional ‘logic voltage’ output with a 5A cur-

rent capability. This output can be selected as 5V or 3.3V via a

front panel switch.

Output voltages up to 150V

The EX752M is a dual output 300 watt PSU with Multi-Mode

capability. This enables it to operate as a dual power supply

with two independent and isolated outputs, or as a single

power supply of double the power.

As a dual, each output provides 0 to 75V at 0 to 2A (mode A). As a

single the output can be selected as either 0 to 75V at 0 to 4A

(mode B) or 0 to 150V at 0 to 2A (mode C). In single modes, the

unused half of the unit becomes completely inoperative and its

displays are blanked.

Because of the higher voltages it can produce, the EX752M uses

special safety binding posts which can accept spade terminals,

4mm plugs, or bare-end wires without exposing any metal parts.

Safety and reliability

The EL & EX series has been designed to meet the stringent re-

quirements of relevant IEC standards for safety and EMC.

All outputs are intrinsically short circuit proof, and are protected

against external voltages and reverse currents.

EL - high performance with low costs

The EL series provides medium levels of power (up to 125 watts)

in a compact and attractive case style using all-linear regulation.

High resolution controls allow precise setting of voltage and

current levels which are indicated on accurate and highly

legible digital meters.

Excellent line and load regulation is matched by very low noise

and good transient response. Improved power efficiency ensures

that the unit requires no fan cooling.

A wide choice of voltage and current

Single output EL series power supplies are available in a variety of

voltage and current combinations to suit differing applications.

Single, dual or triple outputs

EL series units are also available in dual or triple output versions.

The EL302D, for example, has two independent and isolated out-

puts each witha0to 30V, 0 to 2A capability. The outputs operate

in constant voltage or constant current mode with automatic

crossover and mode indication. Each output has its own on-off

switch. The outputs can be wired in either series or parallel to pro-

vide voltages up to 60 volts or currents up to 4 amps.

The EL302T has an additional ‘logic voltage’ output with a 1A cur-

rent capability. This output can be selected as 5V or 3.3V via a

front panel switch.

Power-matched technologies

The EL and EX series of DC bench power supplies have been de-

signed to meet the need for a compact power supply of good per-

formance at a reasonable price.

Two different technologies have been used - all linear for power

levels up to 125 watts (EL series) and switch-mode pre-regulation

with linear post-regulation for higher powers (EX series).

Constant voltage or constant current

The main outputs can operate in constant voltage or constant cur-

rent mode with automatic crossover and mode indication. Coarse

and fine voltage controls are provided. The current control is loga-

rithmic enabling low current levels to be set accurately.

Simultaneous digital metering

The EL and EX series incorporate separate digital voltage and

current meters on each main output. The meters use bright 14mm

(0.56") LED displays and have an update rate of 4 per second pro-

viding near instantaneous response.

Simultaneous metering of voltage and current provides accurate

information “at a glance” and avoids any possibility of misinterpre-

tation.

When an output switch is set to “off”, the current limit setting is dis-

played enabling conditions to be set before the load is connected.

Ready for low-voltage logic

To reflect the increasing usage of low-voltage logic devices, the

third output of the EL302T and EX354T can be switched be-

tween 5 volts and 3.3 volts.

EL series - initial model range

Model

O/Ps

V max. / A max.

Power

EL301

1

30V/1A

30W

EL183

1

18V/3.3A

60W

EL302

1

30V/2A

60W

EL561

1

56V/1.1A

60W

EL302D

2

2 x 30V/2A

120W

EL302T

3

2 x 30V/2A + 5V/1A

125W

EL & EX series - combined range

Single Output

EL301

30V/1A

30 watts

EL183

18V/3.3A

60 watts

EL302

30V/2A

60 watts

EL561

56V/1.1A

60 watts

EX355

35V/5A

175 watts

Dual Output

EL302D

2 x 30V/2A

120 watts

EX354D

2 x 35V/4A

280 watts

EX752M

2 x 75V/2A

or 1 x 75V/4A

or 1 x 150V/2A

300 watts

Triple Output

EL302T

2 x 30V/2A + 5V/1A

125 watts

EX354T

2 x 35V/4A + 5V/5A

305 watts

Further models will follow; please contact our sales desk or visit

our web site for up to date information.

Models illustrated within this brochure:

Above:

EL302T

EX355

EX752M (mode C)

Front cover:

EX354T

EL183 (EL301, EL302, EL561 are similar)

EL302D