Voltage and Current Isolation Amplifiers

The DRA range are DIN Rail mounting 2 or 3 channel isolation amplifiers that can be configured during manufacture. Standard options are offered with 3 types of inputs, External Current Shunt, Internal Current Shunt and Internal Voltage Divider. It can also be offered as a customised unit with the input scaling and configuration defined by the user.

Isolation amplifiers provides a means to measure signals without the signal ground and measurement ground being directly connected. This is desirable in a number of instances in industrial applications:

• The signal is referenced to a ground at a different potential to the measurement system ground.
• The signal has a large common mode swing relative to the measurement system, for example a current sense resistor in an electrical phase.
• Break ground loops so that leakage currents cannot flow in either direction between the signal and the measurement.

The DRA isolation amplifiers have been designed to measure voltage or current. They have 3 channels that can be configured to measure anything from millivolts full scale up to ±1000V full scale. The signal may be voltage from an electrical supply, the phase of a motor, a solenoid drive, or it may be a voltage derived from a sensor such as a current sense resistor.

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Application Notes

General

Current Measurement

THD Measurement