EL155R - AIM-TTI INSTRUMENTS

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.