Electronic Circuit Diagrams


DMM with ICL7103A and ICL8052A

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DMM with ICL7103A and ICL8052A
DMM with ICL7103A and ICL8052A

The purpose of this application note is to describe the operation and potential pitfalls of a 10V resolution (VREF = 100mV) 4 1/2 digit autoranging scheme using the ICL7103A/ICL8052A pair. Two auto-ranging circuits are included within the text. Each is discussed in terms of its advantages and disadvantages. The following section, Basic Circuitry is intended to familiarize the reader with the circuitry common to both designs.

Auto-Ranging DMM with ICL7103A and ICL8052A

With the addition of a precision rectifier and a low pass filter, AC measurements can be made. The precision rectifier shown in Figure 3 is a conventional circuit used for this application. Tolerances can be reduced below ?1% by adjusting a single potentiometer. The user can expect dependable accuracy over a frequency range of 40Hz to 40kHz.

on: 11/2/2021