Cooper Instruments & Systems DCM 465 Voltage Bridge Amplifier - Manual (Page 5)

CF 29 5 4/2001
bridge rather than at the output of the supply thereby eliminating this potential source of error. The decision of whether to
use the sense leads or not depends entirely on the lead length, its resistance and the effect of that error on the
measurement.
Application Suggestions
The DCM 465 is designed to eliminate many of the ordinary problems associated with bridge type measurements. Since
the whole system is in one case the common problem of ground loops or circulating currents caused by poor wiring
practices is eliminated. It is recommended that lead lengths be kept to a minimum. The use of shielded twisted pairs for
the input leads is recommended for most applications.
To minimize self-heating errors the use of minimum excitation power is suggested as is sufficient heat sinking of the
transducer wherever possible. For optimum stability a one hour warm-up is recommended. Avoid large temperature
changes or stray magnetic fields.
The output leads should be kept short to minimize capacitive loading on the output of the amplifier. The DCM 465
Bridgesensor is ready to wire into your system, have power applied, and to start making measurements for you.
Mechanical Specifications
Specifically designed for rugged field use the DCM 465 is completely encapsulated in epoxy using a vacuum potting
system to insure a complete seal against corrosive environments. It is similarly protected against shock and vibration and
will provide years of reliable and accurate operation.
Figure 3. Mechanical Specifications