• woodward Digital Reference Unit P/ N 8272-683
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Digital Reference Unit with High, Low, and Intermediate Set Points
Applications 
The Digital Reference 
Unit generates a precise 
voltage that may be used 
wherever a very accurate 
reference signal is 
required. Typical use 
combines the Digital 
Reference Unit with other 
Woodward controls for 
regulation of speed, load, 
pressure, or voltage. 
Description 
Reference Set Points—
The Digital Reference Unit provides electronic control of the reference-signal 
voltage. Lower limit, upper limit, and an intermediate set point can be selected. 
Ramp Rates—The Digital Reference Unit has two separate and independent ramp 
rates (which determine the time required to change from the low limit to the high 
limit). Each ramp rate can be set for a ramp rate from a minimum of 5 seconds to a 
maximum of 10 minutes. 
Location of Adjustments—Rocker switches under the cover allow selection of 
ramp rate ranges. All other adjustments are made from potentiometers accessible on
the front of the cover. 
Specifications 
Construction: The Digital Reference Unit consists of a printed circuit board housed in a steel 
chassis and cover. 
Power Supply 10–45 Vdc 
 90–150 Vdc   88–132 Vac, 45–440 Hz 
Signal Output 0–8 Vdc 
Ramp Rates: 
  Ramp 1  5 seconds to 10 minutes 
  Ramp 2 (switch selectable)  5 seconds to 10 minutes 
Relay Indications (optional): 
 Low Limit  High Limit  Set Point External Reference provided for ramp speed setting on Woodward EPG and 2500 controls. 
Temperature  –40 to +85 °C 
  –40 to +185 °F 
Location: Can be mounted in any position that provides adequate ventilation and room for 
servicing. May not be mounted on the engine. Protect from exposure to rain or pressure wash.

 
PO Box 1519, Fort Collins CO, USA 80522-1519 
1000 East Drake Road, Fort Collins CO 80525 
Tel.: +1 (970) 482-5811    Fax: +1 (970) 498-3058 
www.woodward.com 
 
Distributors & Service 
Woodward has an international network of distributors and service facilities. 
For your nearest representative, call the Fort Collins plant or see the 
Worldwide Directory on our website. 
 
This document is distributed for informational purposes only. It is not to be construed as 
creating or becoming part of any Woodward contractual or warranty obligation unless 
expressly stated in a written sales contract. 
Copyright © Woodward 2000, All Rights Reserved