Instruction d'utilisation Omega DMD-476

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User’s Guide
®
An OMEGA Technologies Company
http://www.omega.com
e-mail:info@omega.com
DMD-476 Bridgesensor
AC Powered Signal Conditioner

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® omega.com ® ® ® ® ® ® OMEGAnet OMEGAnet OMEGAnet OMEGAnet OMEGAnet On-Line Service On-Line Service On-Line Service On-Line Service On-Line Service Internet e-mail Internet e-mail Internet e-mail Internet e-mail Internet e-mail http://www http://www.omega.com .omega.com http://www http://www http://www.omega.com .omega.com .omega.com info@omega.com info@omega.com info@omega.com info@omega.com info@omega.com Servicing North America: USA: USA: USA: USA: USA: One Omega Drive, Box 4047 ISO 9001 Cer

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Description Specifications NOTE: Unless otherwise noted, specifications apply after one hour The Model DMD-476 is a self contained, AC warm up at 25°C ambient. Temperature coefficients apply between powered signal conditioner for bridge type 0°C and 55°C ambient. instrumentation. It contains a precision Isolation instrumentation amplifier with isolated, filtered 700 VDC Input to Output output and a highly regulated, low noise, adjustable 60pF Amplifier output bridge excitation source. The unit i

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MODEL DMD-476 Block Diagram SWB - Excitation Voltage Mechanical Specifications Se WB-1 Excitation Voltag Os N Fixed 10 Volt Oe FF Adjustabl SWA - Control Switch Se WA-1 Tare Rang OV FF -3mV to +15 m OV N +15 mV to +25 m St WA-2 Zero Curren OA FF 4 m Terminal Strip Assignments OA N 0 m Screw Screw Function Function Terminal Terminal 1E-6 SENS AC S5 WA-4Se WA- Span Rang 2N-7 EXCITATIO +SIGNAL ON NOV 40 mV to 50 m 3E+8 SENS -SIGNAL ON FFOV 20 mV to 40 m 4N+9 EXCITATIO OUTPUT OF NOV F 10 mV to 20 m

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Getting Started with the Model DMD-476 1. Excitation Supply. If remote sensing is not used, connect +Sense to +Excitation, terminal 3 to 4, and connect -Sense to -Excitation, terminal 1 to 2. 2. Apply power to the DMD-476 and adjust the Excitation supply. Turn SWB-1 “ON” for a fixed 10 Volts. This will set the supply to 10.2 ±2.5% and provide the best temperature stability. For voltages between 5 and 10 Volts, place SWB-1 in the “OFF” position and set the Excitation Supply with potentiometer E.

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Amplifier The amplifier is a true differential input, low drift Instrumentation Amplifier with less than 100pA input current. It has a common mode range of 5 Volts with respect to the - EXCITATION supply terminal and a minimum of 100dB rejection of the common mode voltage. The input amplifier and excitation supply are DC isolated from the AC line and the current output. The isolated output current source has a compliance of 20 Volts to allow the Model DMD-476 to operate with zero to 1000 Ohms o

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WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will

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