LAN-XI Input Channels

Uses

• Input channels for multichannel sound and vibration measurements

Features

• All input channels are Dyn-X
• Frequency range 0 to 51.2 kHz
• Input voltage up to 10Vpeak and extended range up to 31.6Vpeak
• Absolute maximum input 60Vpeak without damage
• Support IEEE 1451.4 capable transducers with TEDS
• Automatic DC offset compensation
• Extremely low noise floor
• Selectable floating or grounded outputs
• Low out-of-band spurious noise
• Overload indicator indicates overload, incorrect conditioning and cable breaks on connected transducers
• Overload detection including out-of-band frequencies
• Full phase match among all inputs in a system, including IDA^e hardware

These multipurpose, Dyn-X input channels can be used in combination with the modules' interchangeable front panels to connect and condition all relevant sound and vibration transducers including:

• Microphone preamplifier with 0 or 200V microphone polarization voltage
• DeltaTron microphones
• Proximity probes
• Accelerometers
• DeltaTron Accelerometers
• DC accelerometers (diff. input)
• Charge transducers (via DeltaTron converter)
• AC/DC
• Tachometers (power supply not available)

Independent Channels

The input channels on a module can be set up independently. You can set up the high-pass filters and input gain separately and attach different types of transducers to different channels. The microphone polarization voltage can be switched on for individual channels.

IEEE 1451.4 Transducers

Input modules support TEDS transducers. This allows automatic front-end and analyzer setup based on information stored in the transducer. TEDS information includes, for example, sensitivity, serial number, manufacturer and calibration date.

Overload

Input modules use two methods to detect transducer cable breaks or whether the wrong conditioning has been chosen. For microphones, their supply current is monitored. For DeltaTron accelerometers (or microphones using DeltaTron preamplifiers), the supply voltage is monitored. If conditioning errors, such as a broken cable, are detected, an error is indicated as an overload on the specific channel.
Overload indications for input channels include (see Specifications for details):

• Signal overload with adjustable detection level
• CCLD overload: detection of cable break, short-circuit or CCLD transducer working point fault
• Microphone preamplifier overload: detection of microphone preamplifier current consumption too high or too low
• Common mode voltage overload - relevant when input coupling is floating

Ground-loop Noise Supression

The modules' floating/grounded, differential input design and the fact that all external
connections (LAN, power supply) are galvanically isolated in the module provide optimal
ground-loop noise supression.

Protection

If the signal input level to a module significantly exceeds the measuring range, the input will go into protection mode for at least 0.5 s until the signal falls again. While protected, the input is partly switched off and the input impedance is greatly increased. (The measured value will be strongly attenuated but still detectable.)