DCM 433
CURRENT BRIDGE AMPLIFIER
USER’S GUIDE
www.cooperinstruments.com
PH: 540-349-4746 • FAX: 540-347-4755
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.
Features
• Complete Strain Gage Bridge Signal Conditioner
• Isolated 4-20 mA or 0-20 mA Output
• Output Capable of Driving 1000-ohm Loop
• Bridge Balance with 80% Tare Offset Capability
• High Gain Amplifier; Can Accept Full Scale Live Load Signals as Low as 5 mV and Provide 16mA Output Span
• Excitation Supply Capable of Driving Four Load Cells
• AC Powered
• Rugged Epoxy Encapsulated Design
Applications
• Weighing with Load Cells
• Process Control Add-on Loops
• Can be Used With All Types of Low Output Sensors
DCM 433 Block Diagram
CF 26 2 4/2001
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
Input to Output
Amplifier
Gain
Adjustment Range
Input 4-20mA Output
Linearity ±0.01% of Full Scale
Temperature Stability 50 PPM (0.005%/°C)
Input Noise
.1 Hz to 10 Hz 2µV P-P
Tare Adjustment Range
Bridge Offset
Input Resistance
Differential and Common Mode 1000 megaohm
Common Mode Rejection, DC
Common Mode Input
Output
Zero Adjust
Temperature Coefficient
Current Output Span
Compliance Voltage -1 to +20 Volts
Current -1 mA to +20 mA
Loop Resistance 0 to 1000 ohms
Frequency Response, -3dB 10 Hertz, 2 Pole Roll Off
Response Time
Rise Time 10% to 90%
To 0.1% of Final Value
Bridge Supply
Voltage Adjustment Range
Temperature Coefficient 100 PPM Typical
Fixed 10.2V ±2.5%
Temperature Coefficient 60 PPM Typical
Load Current
Regulation - Load and Line
Output Noise
120 Hz Bandwidth 1 mV RMS, Maximum
Power Input
Optional 220 or 230 VAC, ±10%
Line Isolation
Capacitance 60 pF
Dielectric Withstand 1100 Volts RMS
Environment
Ambient Operating -25°C to +55°C
Storage -25°C to +85°C
Weight
Size
700 VDC
60pF
5 mV to 50 mV
-3 mV to +25 mV
(Equals 80% F.S. of 3 mV/V cell)
100 dB minimum
+5 Volts
0 or 4 mA
1 µA/°C
4 to 20 mA or 0 to 20 mA
35 ms
100 ms
5 to 10 Volts
0 to 120 mA
0.02% maximum
115 VAC, ±10V 50/60 Hz @7 VA
18 oz. (510 grams)
3.75” L x 2.0” W x 2.87” H
(9.53 cm x 5.1 cm x 7.62 cm)
CF 26 3 4/2001
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