DCM 433 CURRENT BRIDGE AMPLIFIER USER’S GUIDE www.cooperinstruments.
Description The Model DCM 433 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.
Specifications 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. Isolation 700 VDC 60pF Input to Output Amplifier Gain Adjustment Range Input 4-20mA Output Linearity Temperature Stability Input Noise .1 Hz to 10 Hz Tare Adjustment Range 5 mV to 50 mV ±0.01% of Full Scale 50 PPM (0.005%/°C) 2µV P-P -3 mV to +25 mV (Equals 80% F.S.
Getting Started with the DCM 433 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 DCM 433 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.
Transducer Excitation The bridge excitation supply voltage is set by SWB-1 and potentiometer E. Set SWB-1 ON for a fixed 10 Volts. This will provide the best temperature stability. The supply can be adjusted between 5 and 10 Volts by setting SWB-1 OFF and adjusting potentiometer E. The supply will deliver up to 120mA current at any voltage setting to power up to four 350-ohm sensors.
Mechanical Specifications Screw Terminal 1 2 3 4 5 Terminal Strip Assignments Screw Function Terminal -SENSE 6 -EXCITATION 7 +SENSE 8 +EXCITATION 9 AC 10 Function AC +SIGNAL -SIGNAL OUTPUT RETURN Warranty Repair Policy Limited Warranty on Products Any Cooper Instruments product which, under normal operating conditions, proves defective in material or in workmanship within one year of the date of shipment by Cooper will be repaired or replaced free of charge provided that a return material authorization
normal usage, has an inherently shorter useful life than one year. The replacement warranty detailed here is the buyer’s exclusive remedy, and will satisfy all obligations of Cooper whether based on contract, negligence, or otherwise. Cooper is not responsible for any incidental or consequential loss or damage which might result from a failure of any and all other warranties, express or implied, including implied warranty of merchantability or fitness for particular purpose.
