Calibration system for pressure transmitters based on AD855X programmable gain amplifier

In general, the voltage signal output from the pressure sensor will be smaller and the output range will be irregular. It is often necessary to use a signal conditioning amplifier to amplify and level the direct output of the pressure sensor to achieve the desired voltage output range.

Integrating the front-end pressure sensor with the rear signal conditioning section forms a complete pressure transmitter. In order to adjust the output of the transmitter to the specified range, each transmitter product needs to be calibrated before leaving the factory. For this pre-factory calibration requirement, this reference design provides a complete multi-channel fully automatic calibration system for pre-delivery calibration of pressure transmitters. The calibration system is based on a calibration system for pressure transmitters using the AD855X programmable gain amplifier.

The AD855X Series is ideal for use as a signal conditioning amplifier in pressure transmitter applications.

• AD855X Series is a zero drift sensor signal amplifier

• Provides digital programmable gain and output offset

• Gain and output offset can be fully simulated in the circuit

• Permanent programming with reliable Polyfuse technology

Hardware design introduction

Calibration of voltage output type pressure transmitter

• Calibration system board with motherboard/subboard design

• Can support calibration and programming of up to 32 channel pressure transmitters

• Can support voltage output type and current output type pressure transmitter

• Flexible interface options

• Provide a simple transmitter simulation solution

Software overview

Fully automatic transmitter calibration and programming

• Connect to the calibration system board via USB to UART interface

• Read voltage/current data using the AGILENT 34401A digital multimeter

• Use GE PACE5000 as the default pressure controller

• Supports two programmable amplifiers, AD8556 and AD8557

• Supports voltage output and current output pressure transmitters

• Test function with separate channels

• Flexible configuration options to support saving and loading configuration files

• Support for saving logs and report files

Flexible PCB , it's the PCB that very thin and could bent very easily. The board material could be PI ( Polyimide) and also could be FR4 and other materials. Normally, the flex PCB thickness is 0.05mm-0.4mm.

 

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The copper is the circuits material and the circuits designed by the PCB designers. Depends on the current in the circuits, the PCB copper thickness could be done with 0.5oz-10oz. But the PCB designers need be noted that the copper track width/space need be enlarged with the thickness. For example, the minimum copper track width/space could be 3mil/3mil with 0.5oz, but would be 4mil/4mil with 1oz.

 

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