Difference between class 1 TEDS sensor and Class 2 TEDS sensor

This page compares class 1 TEDS sensor vs Class 2 TEDS sensor and mentions difference between class 1 TEDS sensor and Class 2 TEDS sensor as defined in IEEE 1451.4 standard.

Introduction: TEDS stands for Transducer ELectronic Data Sheet. It is defined in IEEE 1451.4 standard. It mentions plug and play capabilities of analog transducers.

The standard specifies critical information required by measurement system in order to identify, characterize and interface analog sensor signal. There are two ways to deploy TEDS sensor known as class 1 and class 2 as described below.

TEDS is the standard way to store key information of sensors, transducers and actuators. The sensor houses non-volatile EEPROM which contains following information.
• Sensor type or class
• Serial number
• Model name
• Calibration data
• Manufacturer name

The advantages of using TEDS is to avoid manual entry during sensor setup. It also ensures that correct settings are being applied.

Class 1 TEDS sensor

Class 1 TEDS Sensor

• The figure-1 depicts configuration of class 1 TEDS sensor.
• Both analog signal and digital signal use same line by multiplexing as per sensor biasing.
• This sensor uses EEPROM and switching circuit as per bias direction.

Class 2 TEDS sensor

Class 2 TEDS Sensor

• The figure-2 depicts class 2 TEDS sensor configuration.
• As shown both analog signal and digital TEDS EEPROM signal use separate lines for data transfer.
• This sensor does not require switching circuit as analog and digital TEDS signals are transmitted separately.

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