Cooper Bussmann Stereo Amplifier DCM 433 User Manual

DCM 433  
CURRENT BRIDGE AMPLIFIER  
USER’S GUIDE  
PH: 540-349-4746 FAX: 540-347-4755  
 
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  
5 mV to 50 mV  
Linearity  
Temperature Stability  
±0.01% of Full Scale  
50 PPM (0.005%/°C)  
Input Noise  
.1 Hz to 10 Hz  
2µV P-P  
Tare Adjustment Range  
-3 mV to +25 mV  
(Equals 80% F.S. of 3 mV/V cell)  
Bridge Offset  
Input Resistance  
Differential and Common Mode  
1000 megaohm  
100 dB minimum  
+5 Volts  
Common Mode Rejection, DC  
Common Mode Input  
Output  
Zero Adjust  
0 or 4 mA  
Temperature Coefficient  
Current Output Span  
Compliance Voltage  
Current  
Loop Resistance  
Frequency Response, -3dB  
Response Time  
Rise Time 10% to 90%  
To 0.1% of Final Value  
Bridge Supply  
1 µA/°C  
4 to 20 mA or 0 to 20 mA  
-1 to +20 Volts  
-1 mA to +20 mA  
0 to 1000 ohms  
10 Hertz, 2 Pole Roll Off  
35 ms  
100 ms  
Voltage Adjustment Range  
Temperature Coefficient  
Fixed  
5 to 10 Volts  
100 PPM Typical  
10.2V ±2.5%  
Temperature Coefficient  
Load Current  
60 PPM Typical  
0 to 120 mA  
Regulation - Load and Line  
Output Noise  
0.02% maximum  
120 Hz Bandwidth  
Power Input  
1 mV RMS, Maximum  
115 VAC, ±10V 50/60 Hz @7 VA  
220 or 230 VAC, ±10%  
Optional  
Line Isolation  
Capacitance  
60 pF  
Dielectric Withstand  
Environment  
1100 Volts RMS  
Ambient Operating  
Storage  
-25°C to +55°C  
-25°C to +85°C  
Weight  
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)  
Size  
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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. SWB-2 may be in either  
position.  
3. Turn the power to the Model DCM 433 off and connect the load cell to the DCM 433 Excitation terminals and  
the Amplifier Inputs.  
4. Turn on power to the DCM 433.  
5. Turn SWA-3 “ON”. (To set output ZERO current with pot D.)  
6. Select the expected full-scale signal range according to the table with SWA-4 and SWA-5. If the output from the  
load cell is not known, set both SW-4 and SW-5 “ON” for the 40-50mV range.  
7. Set SWA-2 “OFF” for 4mA or SWA-2 “ON” for 0mA output ZERO.  
8. Adjust D potentiometer for desired ZERO current.  
9. Turn SWA-3 “OFF”. Expect output current to change.  
10. Apply no load or dead weight to load cell.  
11. Adjust TARE potentiometers A and B for the same ZERO current set in Step 8. SWA-1 “OFF” provides a bridge  
output balance of -3mV to +15mV, and “ON” between +15mV and +25mV.  
12. Apply full-scale load and adjust SPAN (GAIN) potentiometer C for the desired full scale output current. Set  
Range switches SWA-4 and SWA-5 as required.  
13. Remove full-scale load and check ZERO output current. Adjust FINE TARE potentiometer A if required.  
14. Recheck full scale as in Step 12.  
15. End.  
Note: If the amplifier is used without using the DCM 433 Excitation Supply, the external power supply low side must  
be connected to the -EXCITATION terminal 2 on the DCM 433, or one of the inputs must be tied to terminal 2,  
-EXCITATION. This provides a DC return path for the finite amplifier input current.  
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 DCM 433 to operate with zero to 1000  
Ohms of loop resistance.  
Tare Weight Compensation  
The Model DCM 433 has two different zero controls. One is called the OUTPUT zero and can be set to 0mA or  
4mA with SWA-2. The other zero control is called TARE. SWA-1 allows the selection of one of two TARE ranges, -  
3mV to 15mV or +15mV to +25mV. Potentiometers are available for COARSE and FINE TARE adjustments.  
Connecting to a Sensor  
Any amplifier has a finite input current, which must have DC return path to the amplifier power supplies. This path is  
automatically provided when the DCM 433 Bridge Excitation Supply is used to excite the sensor. If an external  
supply is used, one side of the external supply must be connected to the Model DCM 433 common, Terminal 2. Be  
sure that the common mode voltage limits are observed. This would generally limit the external power supply to 10  
Volts assuming that half the voltage would be common mode, as is the case when exciting a full bridge.  
When the full-scale output of a sensor is measured in millivolts, say 10 millivolts, care must be exercised in wiring  
systems. At 10 millivolts full scale, each microvolt (10-6 volts) contributes 0.01% of full-scale output. Wire  
connections can generate microvolts of potential due to contact potentials. These will also be thermoelectric  
potentials and thus vary with temperature differences. All wires used in connecting up the DCM 433 should be of  
the same material. If any intervening connections are made such as a terminal block, the terminal block connecting  
points should have good thermal contact so they will always be at the same temperature and thus cancel each  
other.  
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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.  
SWB-1 Excitation Voltage  
ON  
OFF  
Fixed 10 Volts  
Adjustable  
SWA-1  
OFF  
ON  
Tare Range  
-3 mV to +15 mV  
+15 mV to +25 mV  
SWA-2  
OFF  
Zero Current  
4 mA  
ON  
0 mA  
SWA-4  
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  
ON  
OFF  
ON  
OFF  
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Mechanical Specifications  
Terminal Strip Assignments  
Screw  
Terminal  
Screw  
Terminal  
Function  
Function  
1
2
3
4
5
-SENSE  
-EXCITATION  
+SENSE  
+EXCITATION  
AC  
6
7
8
9
10  
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 is obtained from Cooper and the defective product is sent, transportation  
charges prepaid, with notice of the defect, and it is established that the product has been properly installed,  
maintained, and operated within the limits of rated and normal usage. Replacement or repaired product will be  
shipped F.O.B. from our plant. The terms of this warranty do not extend to any product or part thereof which, under  
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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. Any unauthorized disassembly or attempt to repair voids this warranty.  
Obtaining Service under Warranty  
Advance authorization is required prior to the return to Cooper Instruments. Before returning the item, contact the  
Repair Department c/o Cooper Instruments at (540) 349-4746 for a Return Material Authorization number.  
Shipment to Cooper shall be at buyer’s expense and repaired or replacement items will be shipped F.O.B. from our  
plant in Warrenton, Virginia. Non-verified problems or defects may be subject to a $100 evaluation charge. Please  
return the original calibration data with the unit.  
Repair Warranty  
All repairs of Cooper products are warranted for a period of 90 days from date of shipment. This warranty applies  
only to those items that were found defective and repaired; it does not apply to products in which no defect was  
found and returned as is or merely recalibrated. It may be possible for out-of-warranty products to be returned to  
the exact original specifications or dimensions.  
Technical description of the defect: In order to properly repair a product, it is absolutely necessary for Cooper to  
receive information specifying the reason the product is being returned. Specific test data, written observations on  
the failure and the specific corrective action you require are needed.  
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