Technical Specifications
82100-0082
THURLBY THANDAR INSTRUMENTS
EL & EX Series
Compact bench DC power supplies
single, dual and triple output models
CYAN MAGENTA YELLOW BLACK
EX series
MAIN OUTPUTS
Voltage Range: 0V to 35V minimum (EX355, EX354D, EX354T)
0V to 75V or 0V to 150V minimum (EX752M)
Current Range: 0A to 2A or 0A to 4A minimum (EX752M)
0A to 4A minimum (EX354D, EX354T)
0A to 5A minimum (EX355)
Operating Mode: Constant voltage or constant current with automatic
cross-over and indication.
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Load regulation: <0.01% of max. O/P for a 90% load change.
Line regulation: <0.01% of max. O/P for a 10% line voltage change.
Output impedance: Typically <5mΩin constant voltage mode. Typically
>50kΩin constant current mode.
Ripple & Noise
(20MHz bandwidth): Typically <2mV rms, <10mV pk-pk, (CV mode).
Transient Response: <200µs to within 50mV of set level for 90% load change.
Temp. Coefficient: Typically <100ppm/oC.
Output Protection: Outputs will withstand forward voltages of up to 40V
(EX355, EX354D, EX354T) or 85V/170V (EX752M).
Over-voltage clamp operates above these levels.
Reverse protection by diode clamp for currents up to 3A.
Status Indication: Output ON lamps. Constant current mode lamps.
Output Switch: Electronic. Preset voltage and current displayed when
output is off.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Special safety terminals on EX752M.
METERS (main outputs)
Meter Types: Separate 3 digit meters for voltage and current with
14mm (0.56") LED displays. Reading rate 4/sec.
(4 digit voltmeter on EX752M).
Meter Resolutions: 100mV, 10mA.
Meter Accuracies: Voltage 0.3% ±1 digit. Current 0.6% ±1 digit.
LOGIC OUTPUT (EX354T only)
Voltage: 5V or 3.3V, selectable by front panel switch.
Voltage accuracy: ±2%
Current limit: 5A minimum
Load regulation: <0.5% for a 90% load change.
Line regulation: <0.1% for a 10% line voltage change.
Ripple & Noise
(20MHz bandwidth): Typically <2mV rms, <10mV pk-pk.
Output Protection: Output will withstand up to 7V forward voltage.
Diode clamp reverse protection for currents to 3A.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Status Indication: Current limit lamp.
EL series
MAIN OUTPUTS
Voltage Range: 0V to18V minimum (EL183)
0V to 30V minimum (EL301, EL302, EL302D, EL302T)
0 to 56V minimum (EL561)
Current Range: 0A to 1A minimum (EL301)
0A to 1.1A minimum (EL561)
0A to 2A minimum (EL302, EL302D, EL302T)
0A to 3.3A minimum (EL183)
Operating Mode: Constant voltage or constant current with automatic
cross-over and indication.
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Load regulation: <0.01% of max. O/P for a 90% load change.
Line regulation: <0.01% of max. O/P for a 10% line voltage change.
Output impedance: Typically <5mΩin constant voltage mode. Typically
>50kΩin constant current mode.
Ripple & Noise
(20MHz bandwidth): Typically <1mV rms, (CV mode).
Transient Response: <20µs to within 50mV of set level for 90% load change.
Temp. Coefficient: Typically <100ppm/oC.
Output Protection: Outputs will withstand forward voltages of up to 20V
above the rated output voltage. Reverse protection
by diode clamp for currents up to 3A.
Status Indication: Output ON lamps. Constant current mode lamps.
Output Switch: Electronic. Preset voltage and current displayed when
output is off.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
METERS (main outputs)
Meter Types: Separate 3 digit meters for voltage and current with
14mm (0.56") LED displays. Reading rate 4/sec.
Meter Resolutions: 100mV, 10mA.
Meter Accuracies: Voltage 0.3% ±1 digit. Current 0.6% ±1 digit.
LOGIC OUTPUT (EL302T only)
Voltage: 5V or 3.3V, selectable by front panel switch.
Voltage accuracy: ±3%
Current limit: 1A minimum.
Load regulation: <0.5% for a 90% load change.
Line regulation: <0.1% for a 10% line voltage change.
Ripple & Noise
(20MHz bandwidth): Typically <1mV rms.
Output Protection: Output will withstand up to 16V forward voltage.
Diode clamp reverse protection for currents to 3A.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Status Indication: Current limit lamp.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and
reserves the right to alter specifications without prior notice.
GENERAL SPECIFICATIONS
MODEL SIZE (W X H X D) mm WEIGHT (kg) Input VA max.
EL301 140 x 160 x 295 3.4 85
EL183 140 x 160 x 295 4.4 160
EL302 140 x 160 x 295 4.4 160
EL561 140 x 160 x 295 4.4 160
EX355 140 x 160 x 320 3.0 350
EL302D 260 x 160 x 295 7.5 320
EL302T 260 x 160 x 295 7.5 320
EX354D 260 x 160 x 320 4.3 600
EX354T 260 x 160 x 320 4.3 600
EX752M 260 x 160 x 320 4.4 600
OUTPUT TERMINALS
Standard Type: 4mm "binding post" terminals suitable for plugs or wires.
EX752M only: As above but with fully "touch proof" construction.
Optional (all models): 4mm safety sockets, suitable for shrouded plugs.
POWER
AC Input: EL series: 230V or 115V ±10% AC, 50/60Hz.
EX355, EX752M: 99V to 262V AC, 50/60Hz.
EX354D, EX354T: 230V ±14% (115V to order).
Installation Category II.
Consumption: See table for maximum VA figures for each model.
ENVIRONMENTAL
Operating Range: +5oC to +40oC, 20% to 80% RH.
Storage Range: -40oC to + 70oC.
Environmental: Indoor use at altitudes to 2000m, Pollution Degree 1.
Safety: Complies with EN61010-1.
EMC: Complies with EN50081-1 and EN50082-1.
Designed and built in the U.K. by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE18 7DX England
Tel: 01480 412451 Fax: 01480 450409 Email: sales@ttinst.co.uk
Web: http://www.ttinst.co.uk
voltage ranges from 0-18V to 0-150V
powers from 30 watts to over 300 watts
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-
regulationtoprovideperformancecomparablewithanalllinear
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.
TheEX354D, for example,has two independentand isolated out-
puts each witha0to35V, 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.
Theoutputscanbewiredineitherseriesorparalleltoprovidevolt-
ages up to 70 volts or currents up to 8 amps.
TheEX354Thasan additional‘logicvoltage’output with a5Acur-
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.
Asadual,eachoutputprovides0to75Vat0to2A(modeA). Asa
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,
4mmplugs,orbare-endwireswithoutexposinganymetalparts.
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)
inacompactandattractivecasestyleusingall-linearregulation.
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
andgoodtransientresponse. Improved power efficiencyensures
that the unit requires no fan cooling.
A wide choice of voltage and current
SingleoutputELseriespowersuppliesareavailableinavarietyof
voltage and current combinations to suit differing applications.
Single, dual or triple outputs
ELseriesunitsarealsoavailableindualortripleoutputversions.
The EL302D, for example, has two independent and isolated out-
puts each witha0to30V, 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. Theoutputscanbewiredineitherseriesorparalleltopro-
vide voltages up to 60 volts or currents up to 4 amps.
TheEL302T hasan additional‘logic voltage’output witha 1A cur-
rent capability. This output can be selected as 5V or 3.3V via a
front panel switch.
Power-matched technologies
TheELand EXseriesofDC benchpowersupplies have beende-
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
levelsupto 125watts(EL series)andswitch-mode pre-regulation
with linear post-regulation for higher powers (EX series).
Constant voltage or constant current
Themainoutputscanoperatein constant voltageorconstantcur-
rentmodewithautomaticcrossoverandmodeindication. Coarse
andfinevoltagecontrolsareprovided. Thecurrentcontrolisloga-
rithmic enabling low current levels to be set accurately.
Simultaneous digital metering
The EL and EX series incorporate separate digital voltage and
currentmetersoneachmainoutput. Themetersusebright14mm
(0.56")LEDdisplaysandhaveanupdaterateof4persecondpro-
viding near instantaneous response.
Simultaneous metering of voltage and current provides accurate
information“ataglance” and avoidsanypossibilityofmisinterpre-
tation.
Whenanoutputswitchissetto“off”,thecurrentlimitsettingisdis-
playedenablingconditionstobesetbeforetheloadisconnected.
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
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-
regulationtoprovideperformancecomparablewithanalllinear
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.
TheEX354D, for example,has two independentand isolated out-
puts each witha0to35V, 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.
Theoutputscanbewiredineitherseriesorparalleltoprovidevolt-
ages up to 70 volts or currents up to 8 amps.
TheEX354Thasan additional‘logicvoltage’output with a5Acur-
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.
Asadual,eachoutputprovides0to75Vat0to2A(modeA). Asa
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,
4mmplugs,orbare-endwireswithoutexposinganymetalparts.
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)
inacompactandattractivecasestyleusingall-linearregulation.
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
andgoodtransientresponse. Improved power efficiencyensures
that the unit requires no fan cooling.
A wide choice of voltage and current
SingleoutputELseriespowersuppliesareavailableinavarietyof
voltage and current combinations to suit differing applications.
Single, dual or triple outputs
ELseriesunitsarealsoavailableindualortripleoutputversions.
The EL302D, for example, has two independent and isolated out-
puts each witha0to30V, 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. Theoutputscanbewiredineitherseriesorparalleltopro-
vide voltages up to 60 volts or currents up to 4 amps.
TheEL302T hasan additional‘logic voltage’output witha 1A cur-
rent capability. This output can be selected as 5V or 3.3V via a
front panel switch.
Power-matched technologies
TheELand EXseriesofDC benchpowersupplies have beende-
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
levelsupto 125watts(EL series)andswitch-mode pre-regulation
with linear post-regulation for higher powers (EX series).
Constant voltage or constant current
Themainoutputscanoperatein constant voltageorconstantcur-
rentmodewithautomaticcrossoverandmodeindication. Coarse
andfinevoltagecontrolsareprovided. Thecurrentcontrolisloga-
rithmic enabling low current levels to be set accurately.
Simultaneous digital metering
The EL and EX series incorporate separate digital voltage and
currentmetersoneachmainoutput. Themetersusebright14mm
(0.56")LEDdisplaysandhaveanupdaterateof4persecondpro-
viding near instantaneous response.
Simultaneous metering of voltage and current provides accurate
information“ataglance” and avoidsanypossibilityofmisinterpre-
tation.
Whenanoutputswitchissetto“off”,thecurrentlimitsettingisdis-
playedenablingconditionstobesetbeforetheloadisconnected.
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
Technical Specifications
82100-0082
THURLBY THANDAR INSTRUMENTS
EL & EX Series
Compact bench DC power supplies
single, dual and triple output models
CYAN MAGENTA YELLOW BLACK
EX series
MAIN OUTPUTS
Voltage Range: 0V to 35V minimum (EX355, EX354D, EX354T)
0V to 75V or 0V to 150V minimum (EX752M)
Current Range: 0A to 2A or 0A to 4A minimum (EX752M)
0A to 4A minimum (EX354D, EX354T)
0A to 5A minimum (EX355)
Operating Mode: Constant voltage or constant current with automatic
cross-over and indication.
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Load regulation: <0.01% of max. O/P for a 90% load change.
Line regulation: <0.01% of max. O/P for a 10% line voltage change.
Output impedance: Typically <5mΩin constant voltage mode. Typically
>50kΩin constant current mode.
Ripple & Noise
(20MHz bandwidth): Typically <2mV rms, <10mV pk-pk, (CV mode).
Transient Response: <200µs to within 50mV of set level for 90% load change.
Temp. Coefficient: Typically <100ppm/oC.
Output Protection: Outputs will withstand forward voltages of up to 40V
(EX355, EX354D, EX354T) or 85V/170V (EX752M).
Over-voltage clamp operates above these levels.
Reverse protection by diode clamp for currents up to 3A.
Status Indication: Output ON lamps. Constant current mode lamps.
Output Switch: Electronic. Preset voltage and current displayed when
output is off.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Special safety terminals on EX752M.
METERS (main outputs)
Meter Types: Separate 3 digit meters for voltage and current with
14mm (0.56") LED displays. Reading rate 4/sec.
(4 digit voltmeter on EX752M).
Meter Resolutions: 100mV, 10mA.
Meter Accuracies: Voltage 0.3% ±1 digit. Current 0.6% ±1 digit.
LOGIC OUTPUT (EX354T only)
Voltage: 5V or 3.3V, selectable by front panel switch.
Voltage accuracy: ±2%
Current limit: 5A minimum
Load regulation: <0.5% for a 90% load change.
Line regulation: <0.1% for a 10% line voltage change.
Ripple & Noise
(20MHz bandwidth): Typically <2mV rms, <10mV pk-pk.
Output Protection: Output will withstand up to 7V forward voltage.
Diode clamp reverse protection for currents to 3A.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Status Indication: Current limit lamp.
EL series
MAIN OUTPUTS
Voltage Range: 0V to18V minimum (EL183)
0V to 30V minimum (EL301, EL302, EL302D, EL302T)
0 to 56V minimum (EL561)
Current Range: 0A to 1A minimum (EL301)
0A to 1.1A minimum (EL561)
0A to 2A minimum (EL302, EL302D, EL302T)
0A to 3.3A minimum (EL183)
Operating Mode: Constant voltage or constant current with automatic
cross-over and indication.
Voltage Setting: By coarse and fine controls.
Current Setting: By single logarithmic control.
Load regulation: <0.01% of max. O/P for a 90% load change.
Line regulation: <0.01% of max. O/P for a 10% line voltage change.
Output impedance: Typically <5mΩin constant voltage mode. Typically
>50kΩin constant current mode.
Ripple & Noise
(20MHz bandwidth): Typically <1mV rms, (CV mode).
Transient Response: <20µs to within 50mV of set level for 90% load change.
Temp. Coefficient: Typically <100ppm/oC.
Output Protection: Outputs will withstand forward voltages of up to 20V
above the rated output voltage. Reverse protection
by diode clamp for currents up to 3A.
Status Indication: Output ON lamps. Constant current mode lamps.
Output Switch: Electronic. Preset voltage and current displayed when
output is off.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
METERS (main outputs)
Meter Types: Separate 3 digit meters for voltage and current with
14mm (0.56") LED displays. Reading rate 4/sec.
Meter Resolutions: 100mV, 10mA.
Meter Accuracies: Voltage 0.3% ±1 digit. Current 0.6% ±1 digit.
LOGIC OUTPUT (EL302T only)
Voltage: 5V or 3.3V, selectable by front panel switch.
Voltage accuracy: ±3%
Current limit: 1A minimum.
Load regulation: <0.5% for a 90% load change.
Line regulation: <0.1% for a 10% line voltage change.
Ripple & Noise
(20MHz bandwidth): Typically <1mV rms.
Output Protection: Output will withstand up to 16V forward voltage.
Diode clamp reverse protection for currents to 3A.
Output Terminals: 4mm terminals on 19mm (0.75") pitch (see below).
Status Indication: Current limit lamp.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and
reserves the right to alter specifications without prior notice.
GENERAL SPECIFICATIONS
MODEL SIZE (W X H X D) mm WEIGHT (kg) Input VA max.
EL301 140 x 160 x 295 3.4 85
EL183 140 x 160 x 295 4.4 160
EL302 140 x 160 x 295 4.4 160
EL561 140 x 160 x 295 4.4 160
EX355 140 x 160 x 320 3.0 350
EL302D 260 x 160 x 295 7.5 320
EL302T 260 x 160 x 295 7.5 320
EX354D 260 x 160 x 320 4.3 600
EX354T 260 x 160 x 320 4.3 600
EX752M 260 x 160 x 320 4.4 600
OUTPUT TERMINALS
Standard Type: 4mm "binding post" terminals suitable for plugs or wires.
EX752M only: As above but with fully "touch proof" construction.
Optional (all models): 4mm safety sockets, suitable for shrouded plugs.
POWER
AC Input: EL series: 230V or 115V ±10% AC, 50/60Hz.
EX355, EX752M: 99V to 262V AC, 50/60Hz.
EX354D, EX354T: 230V ±14% (115V to order).
Installation Category II.
Consumption: See table for maximum VA figures for each model.
ENVIRONMENTAL
Operating Range: +5oC to +40oC, 20% to 80% RH.
Storage Range: -40oC to + 70oC.
Environmental: Indoor use at altitudes to 2000m, Pollution Degree 1.
Safety: Complies with EN61010-1.
EMC: Complies with EN50081-1 and EN50082-1.
Designed and built in the U.K. by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE18 7DX England
Tel: 01480 412451 Fax: 01480 450409 Email: sales@ttinst.co.uk
Web: http://www.ttinst.co.uk
voltage ranges from 0-18V to 0-150V
powers from 30 watts to over 300 watts
