PSW 40-81 Programmable Switching D.C. Power Supply

Key Features

Output range 0–40 V / 0–81 A / 1080 W
High-efficiency programmable DC power supply
Supports USB, LAN, GPIB, and RS-232 interfaces
Low ripple and noise for precision applications
Built-in OVP, OCP, OTP, and OPP protection
Series and parallel operation capability
Compact design with intuitive LCD display
Ideal for lab testing and automated systems

The PSW 40-81 Programmable Switching DC Power Supply is a high-performance, compact unit designed for precision power delivery in demanding test and development environments. Offering a versatile output range of 0 to 40 volts and 0 to 81 amps, it delivers a maximum power output of 1080 watts, making it ideal for applications requiring high current at low voltages. This model features a programmable interface, allowing for precise voltage and current control via USB, LAN, GPIB, or RS-232 interfaces, supporting seamless integration into automated test systems. With its high efficiency, low ripple and noise, and built-in protection mechanisms—including overvoltage, overcurrent, overtemperature, and overpower protection—the PSW 40-81 ensures safe and reliable operation. The unit also supports series and parallel configurations for expanded power output, and its intuitive front panel interface with a bright LCD display enhances ease of use for both laboratory and industrial settings.

PSW-Series Specifications

The specifications apply when the PSW-Series is powered on for at least 30 minutes under +20°C~+30°C.

PSW-360W
Model		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Rated Output Voltage		V	30	40	80	160	250	800
Rated Output Current		A	36	27	13.5	7.2	4.5	1.44
Rated Output Power		W	360	360	360	360	360	360
Power Ratio		—	3	3	3	3.2	3.125	3.2
Constant Voltage Mode		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Line Regulation (*1)		mV	18	23	43	83	128	403
Load Regulation (*2)		mV	20	25	45	85	130	405
Ripple and Noise (*3)
	p-p (*4)	mV	60	60	60	60	80	150
	r.m.s (*5)	mV	7	7	7	12	15	30
Temperature coefficient		ppm/°C	100ppm/°C of rated output voltage, after a 30 minute warm-up.
Remote sense compensation voltage		V/wire	0.6	0.6	0.6	0.6	1	1
Rise Time (*6)
	Rated Load	ms	50	50	50	100	100	150
	No Load	ms	50	50	50	100	100	150
Fall Time (*7)
	Rated Load	ms	50	50	50	100	150	300
	No Load	ms	500	500	500	1000	1200	2000
Transient response time (*8)		ms	1	1	1	2	2	2
Constant Current Mode		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Line regulation (*1)		mA	41	32	18.5	12.2	9.5	6.44
Load regulation (*9)		mA	41	32	18.5	12.2	9.5	6.44
Ripple and noise
	r.m.s (*5 )	mA	72	54	27	15	10	5
Temperature coefficient		ppm/°C	200ppm/°C of rated output current, after a 30 minute warm-up.
Protection Function		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Over voltage protection (OVP)
	Setting range	V	3-33	4-44	8-88	16-176	20-275	20-880
	Setting accuracy		± (2% of rated output voltage)
Over current protection (OCP)
	Setting range	A	3.6-39.6	2.7-29.7	1.35-14.85	0.72-7.92	0.45-4.95	0.144-1.584
	Setting accuracy		± (2% of rated output current)
Over temperature protection (OTP)
	Operation		Turn the output off.
Low AC input protection (AC-FAIL)
	Operation		Turn the output off.
Power limit (POWER LIMIT)
	Operation		Over power limit.
	Value (fixed)		Approx. 105% of rated output power
Front Panel		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Display, 4 digits
	Voltage accuracy 0.1% +	mV	20	20	20	100	200	400
	Current accuracy 0.1% +	mA	40	30	20	5	5	2
Programming and Measurement (Interface)		PSW	30-36	40-27	80-13.5	160-7.2	250-4.5	800-1.44
Voltage programming accuracy 0.1% +		mV	10	10	10	100	200	400
Current programming accuracy 0.1% +		mA	30	20	10	5	5	2
Voltage programming resolution		mV	1	1	2	3	5	14
Current programming resolution		mA	1	1	1	1	1	1
Voltage measurement accuracy 0.1% +		mV	10	10	10	100	200	400
Current measurement accuracy 0.1% +		mA	30	20	10	5	5	2
Voltage measurement resolution		mV	1	1	2	3	5	14

Current measurement resolution		mA	1	1	1	1	1	1

PSW-720W
Model		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Rated Output Voltage		V	30	40	80	160	250	800
Rated Output Current		A	72	54	27	14.4	9	2.88
Rated Output Power		W	720	720	720	720	720	720
Power Ratio		—	3	3	3	3.2	3.125	3.2
Constant Voltage Mode		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Line Regulation (*1)		mV	18	23	43	83	128	403
Load Regulation (*2)		mV	20	25	45	85	130	405
Ripple and Noise (*3)
	p-p (*4)	mV	80	80	80	80	100	200
	r.m.s (*5)	mV	11	11	11	15	15	30
Temperature coefficient		ppm/°C	100ppm/°C of rated output voltage, after a 30 minute warm-up.
Remote sense compensation voltage		V/wire	0.6	0.6	0.6	0.6	1	1
Rise Time (*6)
	Rated Load	ms	50	50	50	100	100	150
	No Load	ms	50	50	50	100	100	150
Fall Time (*7)
	Rated Load	ms	50	50	50	100	150	300
	No Load	ms	500	500	500	1000	1200	2000
Transient response time (*8)		ms	1	1	1	2	2	2
Constant Current Mode		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Line regulation (*1)		mA	77	59	32	19.4	14	7.88
Load regulation (*9)		mA	77	59	32	19.4	14	7.88
Ripple and noise
	r.m.s (*5 )	mA	144	108	54	30	20	10
Temperature coefficient		ppm/°C	200ppm/°C of rated output current, after a 30 minute warm -up.
Protection Function		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Over voltage protection (OVP)
	Setting range	V	3-33	4-44	8-88	16-176	20-275	20-880
	Setting accuracy		± (2% of rated output voltage)
Over current protection (OCP)
	Setting range	A	5-79.2	5-59.4	2.7-29.7	1.44-15.84	0.9-9.9	0.288-3.168
	Setting accuracy		± (2% of rated output current)
Over temperature protection (OTP)
	Operation		Turn the output off.
Low AC input protection (AC-FAIL)
	Operation		Turn the output off.
Power limit (POWER LIMIT)
	Operation		Over power limit.
	Value (fixed)		Approx. 105% of rated output power
Front Panel		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Display, 4 digits
	Voltage accuracy 0.1% +	mV	20	20	20	100	200	400
	Current accuracy 0.1% +	mA	70	60	40	30	10	4
Programming and Measurement (Interface)		PSW	30-72	40-54	80-27	160-14.4	250-9	800-2.88
Voltage programming accuracy 0.1% +		mV	10	10	10	100	200	400
Current programming accuracy 0.1% +		mA	60	50	30	15	10	4
Voltage programming resolution		mV	1	1	2	3	5	14
Current programming resolution		mA	2	2	2	2	1	1
Voltage measurement accuracy 0.1% +		mV	10	10	10	100	200	400

Current measurement accuracy 0.1% +		mA	60	50	30	15	10	4
Voltage measurement resolution		mV	1	1	2	3	5	14
Current measurement resolution		mA	2	2	2	2	1	1

PSW-1080W
Model		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Rated Output Voltage		V	30	40	80	160	250	800
Rated Output Current		A	108	81	40.5	21.6	13.5	4.32
Rated Output Power		W	1080	1080	1080	1080	1080	1080
Power Ratio		—	3	3	3	3.2	3.125	3.2
Constant Voltage Mode		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Line Regulation (*1)		mV	18	23	43	83	128	403
Load Regulation (*2)		mV	20	25	45	85	130	405
Ripple and Noise (*3)
	p-p (*4)	mV	100	100	100	100	120	200
	r.m.s (*5)	mV	14	14	14	20	15	30
Temperature coefficient		ppm/°C	100ppm/°C of ra ted output voltage, after a 30 minute warm-up.
Remote sense compensation voltage		V/wire	0.6	0.6	0.6	0.6	1	1
Rise Time (*6)
	Rated Load	ms	50	50	50	100	100	150
	No Load	ms	50	50	50	100	100	150
Fall Time (*7)
	Rated Load	ms	50	50	50	100	150	300
	No Load	ms	500	500	500	1000	1200	2000
Transient response time (*8)		ms	1	1	1	2	2	2
Constant Current Mode		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Line regulation (*1)		mA	113	86	45.5	26.6	18.5	9.32
Load regulation (*9)		mA	113	86	45.5	26.6	18.5	9.32
Ripple and noise
	r.m.s (*5 )	mA	216	162	81	45	30	15
Temperature coefficient		ppm/°C	200ppm/°C of rated output current, after a 30 minute warm-up.
Protection Function		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Over voltage protection (OVP)
	Setting range	V	3-33	4-44	8-88	16-176	20-275	20-880
	Setting accuracy		± (2% of rated output voltage)
Over current protection (OCP)
	Setting range	A	5-118.8	5-89.1	4.05-44.55	2.16-23.76	1.35-14.85	0.432-4.752
	Setting accuracy		± (2% of rated output current)
Over temperature protection (OTP)
	Operation		Turn the output off.
Low AC input protection (AC-FAIL)
	Operation		Turn the output off.
Power limit (POWER LIMIT)
	Operation		Over power limit.
	Value (fixed)		Approx. 105% of rated output power
Front Panel		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Display, 4 digits
	Voltage accuracy 0.1% +	mV	20	20	20	100	200	400
	Current accuracy 0.1% +	mA	100	80	50	30	20	6
Programming and Measurement (Interface)		PSW	30-108	40-81	80-40.5	160-21.6	250-13.5	800-4.32
Voltage programming accuracy 0.1% +		mV	10	10	10	100	200	400
Current programming accuracy 0.1% +		mA	100	80	40	20	15	6
Voltage programming resolution		mV	1	1	2	3	5	14

Current programming resolution		mA	3	3	3	3	1	1
Voltage measurement accuracy 0.1% +		mV	10	10	10	100	200	400
Current measurement accuracy 0.1% +		mA	100	80	40	20	15	6
Voltage measurement resolution		mV	1	1	2	3	5	14
Current measurement resolution		mA	3	3	3	3	1	1

Common Specification
Input Characteristics		PSW	30V	40V	80V	160V	250V	800V
Nominal input rating			100Vac to 240Vac, 50Hz to 60Hz, single phase
Input voltage range			85Vac ~ 265Vac
Input voltage range			47Hz ~ 63Hz
Maximum input current
	100Vac	A	360W: 5A, 720W: 10A, 1080W: 15A
	200Vac	A	360W: 2.5A, 720W: 5A, 1080W: 7.5A
Inrush current		A	< 25A for 360W, < 50A for 720W, < 75A for 1080W
Maximum input power		VA	360W: 500VA, 720W: 1000VA, 1080W: 1500VA
Power factor
	100Vac		0.99
	200Vac		0.97
Efficiency
	100Vac	%	77	78	78	79	79	80
	200Vac	%	79	80	80	81	81	82
Hold-up time			20ms or greater
Analog Programming and Monitoring		PSW	30V	40V	80V	160V	250V	800V
External voltage control output voltage			Accuracy and linearity: ±0.5% of rated output voltage.
External voltage control output current			Accuracy and linearity: ±1% of rated output current.
External resistor control output voltage			Accuracy and linearity: ±1.5% of rated output voltage.
External resistor control output current			Accuracy and linearity: ±1.5% of rated output current.
Output voltage monitor
	Accuracy	%	±1	±1	±1	±1	±2	±2
Output current monitor
	Accuracy	%	±1	±1	±1	±1	±2	±2
Shutdown control			Turns the output off with a LOW (0V to 0.5V) or short-circuit.
Output on/off control			Possible logic selections: Turn the output on using a LOW (0V to 0.5V) or short-circuit, turn the output off using a HIGH (4.5V to 5V) or open-circuit. Turn the output on using a HIGH (4.5V to 5V) or open-circuit, turn the output off using a LOW (0V to 0.5V) or short-circuit.
CV/CC/ALM/PWR ON/OUT ON indicator			Photocoupler open collector output; Maximum voltage 30V, maximum sink current 8mA.
Series and Parallel Capability		PSW	30V	40V	80V	160V	250V	800V
Parallel number		Units	3	3	3	3	3	3
Series Number		Units	2	2	2	2	None	None
Front Panel
Indications			GREEN LED’s: CV, CC, VSR, ISR, DLY, RMT, 20, 40, 60, 80, 100, %W, W, V, A RED LED’s: ALM
Buttons			Function, OVP/OCP, Set, Test, Lock/Local, PWR DSPL, Output
Knobs			Voltage, Current
USB port			Type A USB connector
Interface Capabilities
USB			TypeA: Host, TypeB: Slave, Speed: 1.1/2.0, USB Class: CDC(Communications Device Class)
LAN			MAC Address, DNS IP Address, User Password, Gateway IP Address, Instrument IP Address, Subnet Mask

GPIB		Optional: GUG-001 (GPIB to USB Adapter)
Environmental Conditions
Operating temperature		0˚C to 50˚C
Storage temperature		-25˚C to 70˚C
Operating humidity		20% to 85% RH; No condensation
Storage humidity		90% RH or less; No condensation
Altitude		Maximum 2000m
General Specifications
Weight (main unit only)	kg	Approx. 3kg for 360W, Approx. 5.3kg for 720W, Approx. 7.5kg for 1080W
Dimensions (WxHxD)	mm	360W: 71×124×350mm, 720W: 142×124×350mm, 1080W: 214×124×350mm
Cooling		Forced air cooling by internal fan.
EMC		Complies with the European EMC directive 2004/108 /EC for Class A test and measurement products.
Safety		Complies with the European Low Voltage Directive 2006 /95/EC and carries the CE-marking.
Withstand voltage		Between input and chassis: No abnormalities at 1500 Vac for 1 minute.
		Between input and output: No abnormalities at 3000 Vac for 1 minute.
		Between output and chassis: No abnormalities at 500 Vdc for 1 minute for 30V, 40V, 80V, 160V models.
		No abnormalities at 1500 Vdc for 1 minute for 250V, 800V models.
Insulation resistance		Between input and chassis: 500 Vdc, 100MΩ or more
		Between input and output: 500 Vdc, 100MΩ or more
		Between output and chassis: 500 Vdc, 100MΩ or more for 30V, 40V, 80V, 160V and 250V models.
		1000Vdc, 100MΩ or more for 800V models.

Notes

*1: At 85 ~ 132Vac or 170 ~ 265Vac, constant load.

*2: From No-load to Full-load, constant input voltage. Measured at the sensing point in Remote Sense.

*3: Measure with JEITA RC-9131B (1:1) probe

*4: Measurement frequency bandwidth is 10Hz to 20MHz.

*5: Measurement frequency bandwidth is 5Hz to 1MHz.

*6: From 10% to 90% of rated output voltage, with rated resistive load.

*7: From 90% to 10% of rated output voltage, with rated resistive load.

*8: Time for output voltage to recover within 0.1% + 10mV of its rated output for a load change from 50 to 100% of its rated output current.

*9: For load voltage change, equal to the unit voltage rating, constant input voltage.

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Accessories

CD-ROM	x 1 (Programming Manual, User Manual)
Power Cord	x 1 (Region dependent)
GTL-123	Test Lead x 1 (for PSW 30 V / 40 V / 80 V / 160 V models)
GTL-240	USB Cable ”L” Type x 1
PSW-004	Basic Accessories Kit x 1 (for PSW 30 V / 40 V / 80 V / 160 V models)
PSW-008	Basic Accessories Kit x 1 (for PSW 250 V / 800 V models)
PSW-009	Output terminal cover (for PSW 30 V / 40 V / 80 V / 160 V models)
PSW-011	Output terminal cover (for PSW 250 V / 800 V models)
PSW-012	High voltage output terminal (for PSW 250 V / 800 V models)

Optional Accessories

PSW-001	Accessory Kit
PSW-002	Simple IDC Tool
PSW-003	Contact Removal Tool
PSW-005	Cable for 2 Units of PSW-Series in series mode connection (for PSW 30 V / 40 V / 80 V / 160 V models)
PSW-006	Cable for 2 Units of PSW-Series in parallel mode connection
PSW-007	Cable for 3 Units of PSW-Series in parallel mode connection
PSW-010	Large filter (for PSW 720 W / 1080 W models)
GUG-001	GPIB to USB Adaptor
GRA-410-J	Rack Mount Kit (JIS)
GRA-410-E	Rack Mount Kit (KIA)
GET-001	Extended Terminal with max. 30 A (for PSW 30 V / 40 V / 80 V / 160 V models)
GET-002	Extended Terminal with max. 10 A (for PSW 250 V / 800 V models)
GET-005	Extended European Terminal with max. 20 A (for PSW 30 V / 40 V / 80 V / 160 V models)
GTL-130	Test Lea: 2 x red, 2 x black (for PSW 250 V / 800 V models)
GTL-248	GPIB Cable, 2000 mm
GUR-001A	USB TO RS-232 Cable (M3), 3000 mm
GUR-001B	USB TO RS-232 Cable (#4-40 UNC), 3000 mm

PSW 40-81 Programmable Switching D.C. Power Supply