AIM & THURLBY THANDAR INSTRUMENTS
EL-R & EX-R Series
Precision laboratory power supplies - single, dual and triple outputs
EL-R Series - linear regulated - 30 watts to 130 watts
EX-R Series - mixed-mode regulated - 175 watts to 420 watts
compact size, silent cooling, 4 digit meters, remote sense
also covers EL302P, EX355P, EX752M
aimtti.comEL-R Series - linear regulated precision laboratory power supplies
EL-R Series
Simplicity with Precision
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 3 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
EL-R Series - Model Range
Model O/Ps Voltage Current Power Aux. O/P
Each main output can operate in constant voltage or constant current
EL301R One 0 to 30V 0 to 1A 30W
mode with automatic crossover and mode indication. Coarse and
EL183R One 0 to 18V 0 to 3.3A 60W
fine voltage controls are provided. The current control is logarithmic
EL302R One 0 to 30V 0 to 2A 60W
enabling low current levels to be set accurately.
EL561R One 0 to 56V 0 to 1.1A 60W
Silent cooling
EL155R One 0 to 15V 0 to 5A 75W
All EL-R series models use convection cooling and are entirely free of
EL303R One 0 to 30V 0 to 3A 90W
EL302RD Two 0 to 30V 0 to 2A 120W fan noise.
EL302RT Three 0 to 30V 0 to 2A 130W 1.5 - 5V @2A
Safety binding-post terminals
Related Models
EL-R series power supplies are fitted with the new TTi designed
EL302P 30V/2A model with RS-232 interface
output terminals. These can accept a 4mm safety plug with rigid
insulating sleeve, a requirement specified by an increasing number of
Simplicity in use
laboratories for safety reasons.
EL-R series power supplies use classic analog controls for
However, unlike the 4mm safety sockets used on some other products,
voltage and current.
the new TTi terminals can also accept fork connectors or bare wires,
The large and bright displays have a fixed resolution to avoid
giving maximum connection flexibility.
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.