16 Operation with a Fiber Optic Link
Description
Narda fiber optic link transmitters are compatible with all 8700 series probes and the Model 8718B meter. The meter has a
The transmitter contains a rechargeable battery that provides both power for its own circuitry and to operate the amplifier in the probe. Full system calibration is maintained because each of the components in the system – meter, fiber optic transmitter, and probe – are independently calibrated. The fiber optic transmitter converts the analog DC voltage out of the probe amplifier to a series of pulses. The pulse rate is directly proportional to the probe output.
Application
The fiber optic link provides total isolation between the meter and the probe which is often desirable when making low frequency measurements. At frequencies below 50 MHz, and especially below 10 MHz, there is significant interaction between the field, the individual making the measurements, and the survey equipment. There is also the possibility that the probe and meter will be at different electrical potentials which can result in a false indication of what is actually a scalar field. See Low Frequency Measurements in the Applications Booklet for additional information.
Chapter 16 Operation with a Fiber Optic Link | 95 |