also covers EL302P, EX355P, EX752M
AIM & THURLBY THANDAR INSTRUMENTS
Precision laboratory power supplies - single, dual and triple outputs
EL-R & EX-R Series
EX-R Series - mixed-mode regulated - 175 watts to 420 watts
EL-R Series - linear regulated - 30 watts to 130 watts
compact size, silent cooling, 4 digit meters, remote sense
aimtti.com
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.
EL-R Series - continued
Single, dual or triple outputs
The EL-R series includes six single output models plus one dual output
and one triple output model.
The EL302RD has two independent and isolated outputs each with a 0
to 30V, 0 to 2A capability and its own on-off switch. The outputs can
be wired in either series or parallel to provide voltages up to 60 volts
or currents up to 4 amps.
All outputs are intrinsically short circuit proof, and are protected
against external voltages and reverse currents.
Variable voltage auxiliary output
The EL302RT incorporates a third output fully variable between 1.5V
and 5.0V with a fixed current limit of 2A.
The set voltage can be measured at the press of a button using the
digital meters.
* Note that this third output uses switch-mode post regulation.
Alternative power supply series
If the EL-R series does not exactly fit your requirements, TTi offers ten
other PSU series totalling around 60 models. The closest models to the
EL-R series are:
New PL & PL-P series
Advanced linear regulated PSUs of ultra-compact size offering up to 90
watts per output. Features include lockable analog controls, variable
voltage span, and 0.1mA current resolution.
The P versions include remote control via analog, RS232, USB and LAN
interfaces with LXI support. GPIB is available as an option.
EX-R series
The EX-R series has similar features to the EL-R series but uses mixed-
mode regulation to offer power from 175 watts up to 420 watts.
Full details of the EX-R series are included within this brochure.
EL302P/EL302P-USB:
operation via RS-232 or USB
The EL302P is a digitally controlled version of the EL302 with an
isolated RS-232 interface. It offers a low-cost solution for a basic
programmable PSU and will be sufficient for many applications
where the sophistication and complexity of GPIB is not needed.
A simple command set allows remote control of voltage, current
and output enable together with read-back of metering values
and operational status. Local control is via three rotary encoders
providing rapid and accurate setting of voltage and current during
bench use.
The EL302P-USB has similar functionality but is controlled via a
USB interface.
EL302P
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.
EX-R Series - continued
Single, dual or triple outputs
The EX-R series includes four single output models plus one dual
output and one triple output model.
The EX354RD has two independent and isolated outputs each
with a 0 to 35V, 0 to 4A capability and its own on-off switch. The
outputs can be wired in either series or parallel to provide voltages
up to 70 volts or currents up to 8 amps.
All outputs are intrinsically short circuit proof, and are protected
against external voltages and reverse currents.
Variable voltage auxiliary output
The EX354RT incorporates a third output fully variable between
1.5V and 5.0V with a fixed current limit of 5A.
The set voltage can be measured at the press of a button using the
digital meters.
Higher current and higher power
Single output versions of the EX-R series are available
with an output current capability up to 20 amps and
output power up to 420 watts.
These higher current models have 10mA meter
resolution.
The highest power versions (EX2020R and EX4210R)
have fan assisted cooling using a low-noise brushless dc
fan with intelligent control.
(All other models use fan-less convection cooling).
Specifications - EL-R Series
EL-R MODEL RANGE
Voltage/Current Levels
EL301R 0 to >30V; 0 to >1A (30W nominal power)
EL183R 0 to >18V; 0 to >3.3A (60W nominal power)
EL302R 0 to >30V; 0 to >2A (60W nominal power)
EL561R 0 to >56V; 0 to >1.1A (60W nominal power)
EL155R 0 to >15V; 0 to >5A (75W nominal power)
EL303R 0 to >30V; 0 to >3A (90W nominal power)
EL302RD 2 x (0 to >30V; 0 to >2A) (120W nominal power)
EL302RT 2 x (0 to >30V; 0 to >2A) (130W nominal power)
plus 1.5 to 5.0V @ 2A
OUTPUT SPECIFICATIONS
Output Setting & Control
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Output Mode: Constant voltage or constant current with automatic cross-over.
CC indicator lit in constant current mode.
Output Switch: Electronic, non isolating. Preset voltage and current limit displayed
when Output is off. On state indicated by LED.
Output Performance
Ripple & Noise: Typically <1mV rms, (CV mode, 20MHz bandwidth).
Load Regulation: <0·01% of maximum output for a 90% load change
(using remote sense).
Line Regulation: <0·01% of maximum output for 10% line change.
Transient Response: <50µs to within 50mV of setting for a 5% to 95% load change.
Temp. Coefficient: Voltage: typically <100ppm/°C.
Output Protection
Output Protection: Output will withstand forward voltages of up to 20V above rated
output voltage. Reverse protection by diode clamp for currents to 3A.
Output Connections
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) spacing.
Terminals can accept fixed shroud 4mm plugs, standard 4mm plugs, fork terminals and bare wires.
Remote Sense
Sense Selection: Voltage sensing is selected as Local or Remote by front panel switch.
Sense Terminals: Sprung loaded screw-less terminals.
METER SPECIFICATIONS
Display Type: Dual 4-digit meters, 14mm (0·56”) LED.
Voltage Meter
Resolution: 10mV
Accuracy: 0·3% of reading ± 3 digits
Current Meter
Resolution: 1mA
Accuracy: 0·5% of reading ± 3 digits
AUXILIARY OUTPUT (EL302RT only)
Voltage: Variable <1.5V to >5V by front panel control.
Meter accuracy: 0.3% ± 4 digits.
Current limit: 2A minimum.
Load regulation: <3% for 90% load change.
Line regulation: <0.2% for 10% line voltage change.
Ripple & Noise Typically <5mVrms, <15mVpk-pk (20MHz bandwidth):
Output Protection: Output will withstand up to 7V forward voltage.
Diode clamp reverse protection for currents up to 3A.
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) spacing.
Status Indication: UNREG lamp.
GENERAL SPECIFICATIONS
Input
AC Input: 230V AC or 115V AC ± 10%, 50/60Hz. Installation Category II
VA Ratings: EL301R - 85 VA; EL302R, EL302P, EL183R, EL561R - 160VA;
EL155R, EL303R - 250VA; EL302RD, EL302RT - 320VA
Temperature & Environmental
Operating Range: +5ºC to +40ºC, 20% to 80% RH
Storage Range: -40ºC to + 70ºC
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.
Cooling: Silent fan-less convection cooling.
Safety & EMC
Safety: Complies with EN61010-1
EMC: Complies with EN61326
Physical
Size: Single output models - 140x160x295 mm (WxHxD).
Dual and triple output models - 260x160x295 mm (WxHxD).
Weight: EL301R - 3.4kg; EL302R, EL302P, EL183R, EL561R - 4.4kg:
EL155R, EL303R - 5.0kg; EL302RD, EL302RT - 7.5kg.
Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the
right to alter specifications without prior notice.
EX752M - higher voltage multi-mode dual
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.
EX355P/EX355P-USB:
operation via RS-232 or USB
The EX355P is a digitally controlled version of the EX355 with an
isolated RS-232 interface.
It offers a low-cost solution for a basic programmable PSU and will be
sufficient for many applications where the sophistication and complexity
of GPIB is not needed.
A simple command set allows remote control of voltage, current
and output enable together with read-back of metering values and
operational status. Local control is via three rotary encoders providing
rapid and accurate setting of voltage and current during bench use.
The EX355P-USB has similar functionality but is controlled via a USB
interface.
EX752M, EX355P
Specifications - EX-R Series
Brochure Part No. 82100-1370
EX-R MODEL RANGE
Voltage/Current Levels
EX355R 0 to >35V; 0 to >5A (175W nominal power)
EX1810R 0 to >18V; 0 to >10A (180W nominal power)
EX2020R 0 to >20V; 0 to >20A (400W nominal power)
EX4210R 0 to >42V; 0 to >10A (420W nominal power)
EX354RD 2 x (0 to >35V; 0 to >4A) (280W nominal power)
EX354RT 2 x (0 to >35V; 0 to >4A) (305W nominal power)
plus <1.5 to >5.0V @ 5A
OUTPUT SPECIFICATIONS
Output Setting & Control
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Output Mode: Constant voltage or constant current with automatic cross-over.
CC indicator lit in constant current mode.
Output Switch: Electronic, non isolating. Preset voltage and current limit displayed
when Output is off. On state indicated by LED.
Output Performance
Ripple & Noise: Typically <2mV rms, <10mV pk-pk (EX355R, EX354RD, EX354RT)
Typically <2mV rms, <20mV pk-pk (EX1810R, EX2020R, EX4210R)
(CV mode, 20MHz bandwidth)
Load Regulation: <0·01% of maximum output for a 90% load change
(using remote sense).
Line Regulation: <0·01% of maximum output for 10% line change.
Transient Response: <200µs to within 50mV of setting for a 5% to 95% load change.
Temp. Coefficient: Voltage: typically <100ppm /°C.
Output Protection
Output Protection: Outputs will withstand forward voltages up to 40V (EX355R, EX354RD,
& EX354RT); 22V (EX1810R); 25V (EX2020R); 48V (EX4210R).
Reverse protection by diode clamp for currents to 3A.
Output Connections
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) spacing.
Terminals can accept fixed shroud 4mm plugs, standard 4mm plugs, fork terminals and bare wires.
Remote Sense
Sense Selection: Voltage sensing is selected as Local or Remote by front panel switch.
Sense Terminals: Sprung loaded screw-less terminals.
METER SPECIFICATIONS
Display Type: Dual 4-digit meters, 14mm (0·56”) LED.
Voltage Meter
Resolution: 10mV
Accuracy: 0·3% of reading ± 3 digits
Current Meter (EX355R, EX354RD, EX354RT)
Resolution: 1mA
Accuracy: 0·5% of reading ± 3 digits
Current Meter (EX1810R, EX2020R, EX4210R)
Resolution: 10mA
Accuracy: 0·6% of reading ± 3 digits
AUXILIARY OUTPUT (EX354RT only)
Voltage: Variable <1.5V to >5V by front panel control.
Meter accuracy: 0.3% ± 4 digits.
Current limit: 5A minimum.
Load regulation: <0.5% for 90% load change.
Line regulation: <0.1% for 10% line voltage change.
Ripple & Noise Typically <2mVrms, <10mVpk-pk (20MHz bandwidth):
Output Protection: Output will withstand up to 7V forward voltage.
Diode clamp reverse protection for currents up to 3A.
Output Terminals: Universal 4mm safety binding posts on 19mm (0·75”) spacing.
Status Indication: UNREG lamp.
GENERAL SPECIFICATIONS
Input
AC Input: EX354RD, EX354RT - 110V to 240V 50/60Hz (universal input);
Other Models - 230V AC ± 10% 50/60Hz; 115V to order.
Installation Category II
VA Ratings: EX810R, EX355R - 400VA; EX354RD, EX354RT - 500VA
EX2020R, EX4210R - 800VA.
Temperature & Environmental
Operating Range: +5ºC to +40ºC, 20% to 80% RH
Storage Range: -40ºC to + 70ºC
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.
Cooling: EX1810R, EX355R, EX354RD, EX354RT - fan-less convection cooling;
EX2020R, EX4210R - fan assisted using low-noise brushless dc fan.
Safety & EMC
Safety: Complies with EN61010-1
EMC: Complies with EN61326
Physical
Size: Single output models - 140x160x320 mm (WxHxD).
Dual and triple output models - 260x160x320 mm (WxHxD).
Weight: EX810R, EX355R - 3.0kg; EX2020R, EX4210R - 3.6kg
EX354RD, EX354RT - 4.3kg.
Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the
right to alter specifications without prior notice.
EL302P, EX355P, EX752M
EL302P/EL302P-USB & EX355P/EX355P-USB
Electronic and mechanical specifications are as per EL302R and EX355R except as follows:
Voltage/Current Levels
EL302P 0 to 30V; 0 to 2A (60W nominal power)
EX355P 0 to 35V; 0 to 5A (175W nominal power)
Output Setting & Control
Voltage Setting: By coarse and fine rotary encoders or RS-232 interface.
Resolution 10mV
Current Setting: By single rotary encoder or RS-232 interface. Resolution 10mA
Metering
Display Type: 4 digit meter for voltage and 3 digit meter for current.
Resolutions: 100mV; 10mA
Accuracy: Voltage - 0·3% of reading ± 1 digit,
Current - 0·6% of reading ± 1 digits
Note that in constant voltage mode the meter will show the set voltage to a resolution of
10mV. However the metering resolution is limited to 100mV when in constant current mode,
and the last digit will be set to zero.
Voltage Sensing
Voltage sensing is local only (i.e. no remote sense).
Power-down Memory
The power supply saves the voltage, current and output-enable status at power down and
restores the settings at power up.
Remote Control
Isolation: Fully opto-isolated from power supply output.
Remote Functions: Set Voltage, Set Current, Set Output On/Off, Read Voltage,
Read Current, Read On/Off, Read Mode (CV or CC).
Setting Accuracy: Voltage 0.3% ±20mV. Current 0.6% ±20mA.
Setting Resolution: Voltage 10mV. Current 10mA.
Readback Accuracy: Voltage 0.3% ±100mV. Current 0.6% ±20 mA.
Readback Resolution: Voltage 100mV. Current 10mA.
RS-232 Interface (EL302P and EX355P only)
Baud Rate: Variable from 600 baud to 9,600 baud.
USB Interface (EL302P-USB and EX355P-USB only)
Conformance: USB 2.0. Compatible with USB 1.x.
EX752M
Electronic and mechanical specifications are as per EX354RD except as follows:
Voltage/Current Levels
EX752M 2 x (0 to >75V; 0 to >2A) (300W nominal power)
Multi-Mode Operation
Three modes of operation can be selected via a rotary switch:
Mode A: Two independent and isolated outputs (75V/2A each).
Mode B: One output of double the current capability (75V/4A).
(Unused output is disabled and its displays are blanked).
Mode C: One output of double the voltage capability (150V/2A).
(Unused output is disabled and its displays are blanked).
Metering
Display Type: 3 digit meters for voltage and current;
(4 digit on second voltmeter to maintain resolution above 100V).
Resolutions: 100mV; 10mA
Accuracy: Voltage - 0·3% of reading ± 1 digit,
Current - 0·6% of reading ± 1 digits
Output Performance
Ripple & Noise: Typically <2mV rms, <15mV pk-pk (CV mode, 20MHz bandwidth)
Load Regulation: Modes A and B - <0·01%; Mode C - <0·1% + 2mV (90% load change)
Voltage Sensing
Voltage sensing is local only (i.e. no remote sense).
Output Protection
Output Protection: Outputs will withstand forward voltages up to 85V/170V.
Over-voltage trip operates above these levels.
Reverse protection by diode clamp for currents to 3A.
Output Terminals
High voltage touch-proof terminals.
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon, Cambridgeshire. PE29 7DR United Kingdom
Tel: +44 1480 412451 Fax: +44 1480 450409
Email: sales@aimtti.com Web: www.aimtti.com
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon, Cambridgeshire PE29 7DR England (United Kingdom)
Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409
Email: info@aimtti.com Web: www.aimtti.com
Designed and built in Europe by:
Company name and product brands
Thurlby Thandar Instruments Ltd. (TTi) is one of Europe’s leading
manufacturers of test and measurement instruments.
Products have been sold under two brand names:
TTi and Aim.
In the future, however, the full product range will be branded Aim-TTi.
This changeover will be gradual and many products will continue to carry
the TTi or Aim brands for some time to come.
Web Addresses (URLs)
The preferred URL for obtaining information concerning Aim-TTi products
is:
www.aimtti.com (international customers)
Customers in the UK should use the URL:
www.aimtti.co.uk
Customers in the USA should use the URL:
www.aimtti.us
Note that previous URLs such as www.tti-test.com will continue to operate
for the time being.
Product Summary
Laboratory Power Supplies
Bench and system power supplies from 30 watts up to
1200 watts using linear, mixed-mode and PowerFlex
regulation technologies.
Waveform Generators
Analog and digital (DDS) function generators, true
arbitrary generators, arbitrary/function generators and
pulse generators.
Precision Measurement Instruments
Benchtop DMMs, frequency counters, component
measurement instruments (LCR), electronic dc loads,
current probes.
RF and EMC Test Equipment
Spectrum analyzers, signal generators, frequency counters,
power meters, emc measurement instruments.
