Chapter 4 Assembly Level Troubleshooting 69
signals into discrete samples.
Technical Description Refer to Figure 28 for the following description.
The 3458A is composed of two major sections: Inguard and Outguard. The
outguard controls instrument operation. The inguard does the actual
measurements and also controls the measurement process.
Both the outguard and inguard sections have their own power supplies. The
outguard section is referenced to chassis ground. The inguard section is
referenced to its own common which is isolated from the outguard section
and chassis ground. Communication between the two sections is provided
through the Isolation Logic Circuitry.
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