902B Abs Piezo
Operation manual
18
Pressure output
The 902B transducer can provide pressure measurement output as an analog voltage or RS232/RS485
digital value. The digital value is presented as fractional number for PR1, PR2 and PR3 reading and as
scientific number in PR4 reading.
Pressure request:
Query:
@253PR2?;FF
Query reply:
@253ACK0.2;FF
Pressure outputs:
PR1:
Absolute Piezo sensor reading
PR2:
Absolute Piezo sensor reading
PR3:
Absolute Piezo sensor reading
PR4:
Absolute Piezo sensor reading (scientific notation)
The analog output is per default based on the absolute Piezo reading and provides a 16 bit linear voltage
output from 0 to 10 V. Refer to Analog output page 23 for details.
Resolution
The digital pressure output has a pressure resolution of 0.1 Torr/mbar/Pascal.
Measuring noise
External sources can interfere with the sensor signal and cause noise in the signal. The low measuring range
is most sensitive to measuring noise due to low signal levels.