B Theory of Operation
Overall Functional Description
The meter is a portable,
Probe Functional Description
The probe senses the electromagnetic fields and develops a signal for transmission to the meter. The probe has an isotropic sensing pattern so that the radiation may be sensed from any direction, except through the handle. Detectors in the probe sense the electromagnetic radiation present and apply signals to preamplifiers U1 and/or U2 located within the probe. Preamplifiers U1 and U2 amplify the signals from the detectors and route them to the meter via connector P1.
Model 8718B Meter Functional Description
The meter receives the signal(s) from the probe, processes the signal(s) and provides a visual display of the levels detected. The signal(s) received from the probe at PROBE connector J1 is routed to amplifier U2. Amplifier U2 amplifies the signal(s) from the probe and generates a signal to drive the A/D converter U3. The output of the A/D converter is routed to microprocessor U5 that drives the LCD.
Appendix B Theory of Operation | 121 |