4 Assembly Level Troubleshooting
114 Keysight 3458A Assembly-Level Repair Manual
3458A Technical Description
General description
The 3458A is a very high precision digital multimeter that can measure AC or DC
volts, AC or DC current, AC+DC volts, AC+DC current, resistance, period, and
frequency.
The 3458A can also perform complex math calculations. Its maximum reading
rate is 100,000 readings/sec. The maximum input voltage is 1000 V peak with 4
1/2 to 8 1/2 digit resolution.
The multimeter has a digitizing function that converts continuous analog signals
into discrete samples.
Technical description
Refer to Figure 4-1 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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