HWD Series – High Precision Linear Power Supplies

Very High Precision Linear Power Supply up to 400V at 200W.


  • Digital Meters
  • Remote Programmable
  • Remote Sensing
  • Series / Parallel Operation
  • 1mV Ripple
  • 200 W Power in Half Rack Size
  • 10 – Turn Voltage Control
  • 10 – Turn Current Control
  • Optional IEEE-488, LAN, RS485, RS232 Control
  • Optional Dual HWD Units in Rack Mount Tray
POWER: 120W TO 200W


The HWD Series High Precision Linear Power Supplies provide pure linear regulated DC power designed to be used in laboratory, system, R&D, and production test applications.

They are preferable to switching power supplies in critical applications where very low noise and very low ripple are essential for critical performance measurements.

The HWD Series units provide full rated voltage or current at any setting (without the need for derating) up to a maximum power of 200 Watts. They operate as both constant voltage (CV) and constant current (CC) mode power supplies, depending on the load and control settings. In addition, HWD Power Supplies can be connected in series or parallel to obtain double the rated power for critical applications where higher power and low noise are essential.

Other benefits of the HWD Series Power Supplies include extremely stable output regulation for both line (source) and load variations, as well as a remote sense feature in the rear terminals for excellent regulation at the point of load.

The optional IEEE 488 (GPIB), LAN, RS485 and RS232 interface allows the HWD Series to operate as a Programmable High Precision Linear Power Supply for critical system and test measurements.

The HWD Series Half-Rack design comes standard as a Benchtop power supply, and can be mounted on a rack with the optional 5.25” X 19” (3U) rack mount tray, which allows for the mounting of two HWD units side-by-side.


HWD6-20B0-6 V0-20 A0.01%0.1%0.01% or 1 mV0.1%
HWD10-15B0-10 V0-15 A0.01%0.1%0.01% or 1 mV0.1%
HWD20-10B0-20 V0-10 A0.01%0.1%0.01% or 2 mV0.1%
HWD40-5B0-40 V0-5 A0.01%0.1%0.01% or 4 mV0.2%
HWD60-3B0-60 V0-3 A0.01%0.1%0.01% or 4 mV0.2%
HWD100-2B0-100 V0-2 A0.01%0.1%0.01% or 4 mV0.2%
HWD200-1B 0–200 V0-1 A0.01%0.1%0.01% or 4 mV0.2%
HWD400-0.5B0-400 V0-0.5 A0.01%0.1%0.01% or 6 mV0.5%

Input:  115 VAC ±10%, 50/60 Hz Single Phase.
Optional:  220 VAC ±10%, 50/60 Hz Single Phase.

Output: See specific model in table. The output is floating and either side may be grounded.

Load Regulation: See specific model in table. Regulation is for a full load step.

Line Regulation: See specific model in table. Regulation is for a line change from within specified input voltage range.

Ripple: ≤1 mV RMS.

Response Time: The output  voltage is within regulation limits in less than 100 microseconds for a ½ load step. The output voltage will remain within regulation limits for input line step within specified voltage range.

Remote Sensing: Units provided with remote sense terminals at the rear for regulation at the point of load.

Remote Programming: All units are voltage programmable at approximately 1000 Ω / Volt except Model HWD400-0.5B which is programmable at 500 Ω / Volt.

Series / Parallel Operation: Two or more units may be operated in series. Two units with the same voltage and current may be operated in parallel.

Temp. Coef.: 0.02% / °C.

Stability: Better than 0.05%/8 hours at constant line, load and temperature after ½ hour warm up.

Operating Temperature: 0°C to +50°C at any combination of line, load and temperature without the need for external cooling.

Terminations: Barrier strip terminal is provided at the rear for output, sensing, remote programming and ground. 5 Way binding posts are provided on the front panel for output and ground. A 7’ 3-wire line cord is provided for AC Input.

Protection: The power supply is protected by a fuse in the input line. The output of the supply is protected by means of a fully adjustable current limiting circuit.

Panel Controls: Digital voltmeter, digital ammeter, 10 turn voltage control, 10 turn current control, pilot light, ON/OFF switch and five way binding posts. The voltage and current control are fully adjustable by means of 10 turn panel potentiometers.

Finish: The standard front panel and chassis finish is light blue. Cover is dark blue.

Size: 4 ½” H x 8”  W x 14” D.
Two units can be mounted in a 5¼“ x 19” rack mount tray.
See options 10 and 11 below.

6Over Voltage Protection
10 1 HWD Mounted in 5¼"x19" Rack Mount Tray
11 2 HWD Mounted in 5¼"x19" Rack Mount Tray
27Chassis Slides
36Voltage/Voltage Programming (0-10V = Full Rated Output Voltage)
52Voltage/Current Programming (0-10V = Full Rated Output Current)
85Voltage/Voltage Programming (Isolated Input 0-10V = Full Rated Voltage)
90 Voltage/Current Programming (Isolated Input 0-10V = Full Rated Current)
108RS232 Control with Readback
110RS485 Control with Readback
112IEEE-488 Control with Readback
123RJ45 Control with Readback

Download Datasheet