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Chapter 3: Service
Troubleshooting and Repair
Theory of Operation
The following is a brief discussion of the basic operating principles of the
54701A active probe. Use the simplified circuit diagram shown below.
Figure 16
Active Probe Simplified Circuit Diagram
Probe Circuitry
All of the probe circuitry is constructed on a ceramic substrate with discrete
parts and two operational amplifier chips. The circuit is a two-path amplifier,
one path for the high-frequency component of the signal and one for the low-
frequency component.
Input Divider
The signal is divided twice in the input impedance network. It is divided by
ten and fed to the high-frequency amplifier. Another pickoff, 0.4% above
ground, goes to the low-frequency amplifier.
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