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LCD Display D1
Keypad S1
Battery B1
The LCD is a
The keypad has 22 keys. It is shielded in aluminum and connects directly to PCB A1.
The battery pack is a custom package consisting of six individual NiCd cells. It has a rated output of 7.2 volts with a capacity of 7.2 Ah. The battery pack contains an over current protection device. It connects directly to PCB A1.
Probe Designs
The probes used with the Model 8718B meter measure either the electric field or the magnetic field. Some have a flat frequency response, others have a shaped frequency response (see Chapter 3, Probe Selection). All 8700 series probes have square law characteristics that provide an accurate summation of field levels present from multiple frequency sources. All probes are internally coated with a thin film, high resistive coating. The film is on the order of 0.5 M per square inch and provides a shield against electrostatic charges. All 8700 series probes utilize a preamplifier in the handle to amplify the detected signals from the sensors. This eliminates
Communications The 876xD series probes operate from 300 kHz to 3 GHz. They
Band Electric use three sensors supported along mutually orthogonal axes.
Field Probes Each sensor consists of a
Appendix B Theory of Operation | 125 |