Datasheet

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.