DCR40

The Sorensen DCR40 series (part of the DCR-B family of phase-controlled power supplies) delivers stable, highly regulated, and adjustable DC power up to 40 VDC. Operating with high efficiency, these silicon-controlled rectifier (SCR) based supplies offer reliable performance in both constant-voltage and constant-current modes, featuring built-in over-voltage protection, remote sensing, and versatile remote programming options.

DC Power Supply Power Electronics Programmable Power Supply

Specifications

General

Parameter	Value
Interfaces	Analog programming (standard); GPIB / IEEE-488 (optional via external programmer)
Display	Dual analog meters (voltage and current)

Physical

Parameter	Value
Power Supply	115 VAC / 208 VAC / 220 VAC / 230 VAC (model-dependent), single-phase, 57-63 Hz
Operating Temperature	0 to +70 °C
Dimensions (W×H×D)	241.3 x 133.4 x 457.2 mm (DCR40-13B) / 482.6 x 133.4 x 457.2 mm (DCR40-25B) / 482.6 x 177.8 x 508.0 mm (DCR40-70B) / 482.6 x 311.2 x 558.8 mm (DCR40-125B) (W×H×D)
Weight	18.1 kg (DCR40-13B) / 34.0 kg (DCR40-25B) / 52.2 kg (DCR40-70B) / 102.1 kg (DCR40-125B)

Output Specifications

Parameter	Value
Rated Output Voltage Range	0 - 40 VDC
Rated Output Current Range	0-13 A (DCR 40-13B) / 0-25 A (DCR 40-25B) / 0-70 A (DCR 40-70B) / 0-125 A (DCR 40-125B)
Maximum Output Power	520 W (DCR 40-13B) / 1000 W (DCR 40-25B) / 2800 W (DCR 40-70B) / 5000 W (DCR 40-125B)
Line Regulation (Voltage)	0.05% of maximum rated voltage
Load Regulation (Voltage)	0.05% of maximum rated voltage
Line Regulation (Current)	0.25% of maximum rated current
Load Regulation (Current)	0.25% of maximum rated current
Output Ripple (RMS)	30 mV (DCR 40-13B) / 40 mV (DCR 40-25B & 40-70B) / 60 mV (DCR 40-125B)
Transient Recovery Time	50 ms (typical) to return within 150 mV of steady-state voltage for a 50% load step
Temperature Coefficient (Voltage)	0.015% per °C of maximum rated voltage
Temperature Coefficient (Current)	0.03% per °C of maximum rated current
Drift (Stability over 8 Hours)	0.1% of maximum output voltage (after 30-minute warm-up)
Operating Modes	Constant Voltage (CV) and Constant Current (CC) with automatic crossover

AC Input Specifications

Parameter	Value
Number of Phases	Single-phase
Input Frequency Range	57 - 63 Hz (standard); 49 - 63 Hz (optional)

Protection and Isolation

Parameter	Value
Over-Voltage Protection (OVP) Range	6 to 47 VDC
Output Isolation Voltage (to Chassis)	150 VDC

System Control and Connectivity

Parameter	Value
Remote Sense Headroom	Up to 1.5 V drop per load lead (3 V total line drop)
Analog Programming Options	Resistance programming: 200 ohms/volt (standard) or 1000 ohms/volt (optional); Voltage programming: 1V/V
Series Configuration Limit	Up to 2 identical units
Parallel Configuration Limit	Multiple units (direct paralleling or master/slave configuration)
Remote On/Off Control	Yes (via rear terminal strip unit shutdown circuit)
Front Panel Controls	Power circuit breaker, coarse and fine voltage adjust potentiometers, coarse and fine current adjust potentiometers

Environmental Specifications

Parameter	Value
Storage Temperature Range	-40 to +85 °C
Operating Temperature Derating	Full rating to +40 °C; derate linearly to 50% current rating at +70 °C
Cooling Method	Convection cooled (DCR 40-13B and DCR 40-25B); Forced-air fan cooled (DCR 40-70B and DCR 40-125B)

Physical Characteristics

Parameter	Value
Form Factor	Rack-mountable or benchtop

Power Requirements

Parameter	Value
AC Input Voltage Tolerance	±10% of nominal rating

Connectivity

Parameter	Value
Optional Digital Interface	GPIB (IEEE-488) control available via external programmer

Front Panel Meters

Parameter	Value
Analog Voltmeter Accuracy	±2% of full scale
Analog Ammeter Accuracy	±2% of full scale

Analog Programming

Parameter	Value
Voltage Programming Resistive Coefficient	200 Ω/V (standard) / 1000 Ω/V (with Option M1)
Voltage Programming Current	5 mA (standard) / 1 mA (with Option M1)

Environmental

Parameter	Value
Operating Humidity Range	0% to 95% non-condensing

Electrical Isolation

Parameter	Value
Insulation Resistance	50 MΩ minimum at 500 VDC (between input/output and chassis)

Performance

Parameter	Value
Duty Cycle	Continuous

Technology

Phase-controlled SCR / Triac with passive LC filter

Applications

Industrial DC power, product burn-in testing, laboratory research, and automated test equipment (ATE) systems