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EX-R Series DC Supplies: Technical Specifications

Power, Precision, Simplicity

  • Mixed mode with linear final regulation
  • Single, dual and triple output models
  • Current up to 20A, power up to 420W
  • Constant voltage or constant current
  • 4 digit meters with 10mV and 1mA (or 10mA) resolution
  • Switchable remote sense terminals for perfect regulation at the load
  • Silent fan-free cooling (except EX202R/4210R)
  • DC output switch enables voltage/current setup without the load connected
  • Safety terminals accept fixed shroud 4mm plugs plus forks and wires
  • EL302RT (triple) has auxiliary output of 1.5V to 5V at 2A


Voltage/Current Ranges
EX355R0 to >35V; 0 to >5A (175W nominal power)
EX1810R0 to >18V; 0 to >10A (180W nominal power)
EX2020R0 to >20V; 0 to >20A (400W nominal power)
EX4210R0 to >42V; 0 to >10A (420W nominal power)
EX354RD2 x (0 to >35V; 0 to >4A) (280W nominal power)
EX354RT2 x (0 to >35V; 0 to >4A) plus <1.5 to >5.0V @ 5A (305W nominal power)
Output Setting & Control
Voltage SettingBy coarse and fine controls
Current SettingBy single logarithmic control
Output ModeConstant voltage or constant current with automatic cross-over. CC indicator in constant current mode.
Output SwitchElectronic, non isolating. Preset voltage and current limit displayed when Output off
Output Performance
Ripple & NoiseTypically < 2 mV rms , <10mV pk-pk , (EX355R, EX354RD, EX354RT)
Typically <2 mV 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<200us to within 50mV of setting for a 5% to 95% load change
Temp. Coefficient (Voltage)typically <100ppm/°C
Output Protection
Output ProtectionOutputs 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 TerminalsUniversal 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 SelectionVoltage sensing is selected as Local or Remote by front panel switch
Sense TerminalsSprung loaded screw-less terminals

Display TypeDual 4-digit meters, 14mm (0.56") LED
Voltage Meter
Accuracy0.3% of reading +/- 3 digits
Current Meter (EX355R,EX354RD, EX354RT)
Accuracy0.5% of reading +/- 3 digits
Current Meter (EX1810R, EX2020R, EX4210R)
Accuracy0.6% of reading +/- 3 digits

Voltage Variable <1.5V to >5V by front panel control
Meter accuracy0.3% +/- 4 digits
Current limit5 A minimum.
Load regulation< 0.5 % for 90% load change
Line regulation <0. 1 % for 10% line voltage change
Ripple & NoiseTypically < 2 mV rms, <10 mV pk-pk (20MHz bandwidth)
Output ProtectionOutput will withstand up to 7V forward voltage. Diode clamp reverse protection for currents up to 3A.
Output TerminalsUniversal 4mm safety binding posts on 19mm (0.75") spacing
Status IndicationUNREG lamp

AC Input
EX354RD, EX354RT110V to 240V 50/60Hz (universal input). Installation Category II
Other Models230V AC +/- 10% 50/60Hz; 115V to order. Installation Category II
VA Ratings
EX810R, EX355R400VA
EX354RD, EX354RT500VA
EX2020R, EX4210R800VA
Temperature & Environmental
Operating Range+5°C to +40°C, 20% to 80% RH
Storage Range-40°C to + 70°C
EnvironmentalIndoor use at altitudes up to 2000m, Pollution Degree 2
EX1810R, EX355R, EX354RD, EX354RTfan-less convection cooling
EX2020R, EX4210Rfan assisted using low-noise brushless dc fan
Safety & EMC
SafetyComplies with EN61010-1
EMCComplies with EN61326

Single output models140x160x320mm (WxHxD)
Dual and triple output models260x160x 320 mm (WxHxD)
EX810R, EX355R3.0kg
EX2020R, EX4210R3.6kg
EX354RD, EX354RT4.3kg