Universal High-Precision Measurement Interface [130150-I]

The proposed application interfaces any system configured in wheastone bridge for measurement of temperature, pressure, voltage, etc. The Wheastone bridge configuration allows you to read voltages lower than one millivolt with great precision. The dimensions of the card are 1.40 x 1 inch: very small! It is easy to build, components are inexpensive and used by many professionals.

Published in July/August 2013 edition

Order PCB here

Discussion (4 comments)

binistor28 11 years ago

The interface measurement precision is supplied at 5 volts. This supply must be accurate and free from 'noise'. Indeed, in a 18-bit conversion, the slightest noise can be interpreted as a small voltage value for the MCP3421 ADC.
Why a gradual rise to power?
Able, it is required to wait for a stabilization temperature and voltage to reduce the drift due to the different characteristics of the components used.
It is possible to program a timer by software but all the components of the card will not be affected.
This card includes a low-drop regulator MIC2941 (manufacturer Micrel). Its output voltage can be adjusted as is the LM317.
It also includes capacitors and filter chokes adequate for the required characteristics.
The gradual rise is integrated on the small module.
It can be put in place to control any type 78 **