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Description Specifications The Model DMD-476 is a self contained, AC powered signal conditioner for bridge type instrumentation. It contains a precision instrumentation amplifier with isolated, filtered output and a highly regulated, low noise, adjustable output bridge excitation source. The unit is completely encapsulated for use in rugged environments. NOTE: Unless otherwise noted, specifications apply after one hour warm up at 25°C ambient. Temperature coefficients apply between 0°C and 55°C ambient.
MODEL DMD-476 Block Diagram SWB - Excitation Voltage SWB-1 ON OFF Mechanical Specifications Excitation Voltage Fixed 10 Volts Adjustable SWA - Control Switch SWA-4 ON OFF ON OFF 4 SWA-1 Tare Range OFF -3mV to +15 mV ON +15 mV to +25 mV SWA-2 Zero Current OFF 4 mA ON 0 mA SWA-5 ON ON OFF OFF Span Range 40 mV to 50 mV 20 mV to 40 mV 10 mV to 20 mV 5 mV to 10 mV Terminal Strip Assignments Screw Terminal Function Screw Terminal Function 1 2 3 4 5 -SENSE -EXCITATION +SENSE +EXCITATION
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.
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.
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 OMEGAs customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
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