HBM QuantumX - Page 77

Modules and transducers
QuantumX A03031_24_E00_01 HBM: public 77
serves as the "transducer identification". The amplifier switches automatically
to the configured measurement mode after the digital identification mode.
TEDS data can also be read with a software command, for example with cat
man
®
AP.
All TEDS data can be read and edited with the TEDS Editor, see section 3.6.
QuantumX supports several options for reading and writing TEDS data:
S It is possible to access a TEDS module via two separate cable wires
("one‐wire circuit") or retrofit TEDS in the transducer connector.
S Amplifiers with direct connection of IEPE transducers support TEDS Ver
sion 1.0.
S A special TEDS module is integrated in some HBM transducers. It can
transmit TEDS data via the feedback line of a sensor (patented "zero‐wire
circuit").
The amplifier switches to the measurement mode after the digital commu
nication (data mode). These transducers include the force transducer U93
for example.
S Thermocouple amplifiers with RFID chips on the transducer connector sup
port the TEDS technology, for example to automatically transmit the meas
uring point or additional calibration data to the amplifier after connection.
The data sheet of each amplifier includes further specifications with regards to
TEDS, e.g. the maximum possible cable length to the transducer. If TEDS is
not used, the possible cable length can be significantly longer.
Retrofitting TEDS in transducer connectors
The IEEE standard 1451.4 defines a generally acknowledged process with
which sensors can be identified. The sensor is identified by the respective data
sheet which is stored in electronic format in the sensor, cable or plug on a
1-wire EEPROM (TEDS - Transducer Electronic Data Sheet). The amplifier
communicates with this EEPROM via the serial 1-wire interface, reads the data
sheet and makes the corresponding amplifier settings.
The following figure shows the retrofitting of TEDS in a plug. The bridge
between Pin 4 and Pin 9 is used for plug identification of the transducer. It
starts automatic reading of the TEDS.