1-channel input module for acceleration sensors Part B VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Nov, 2014 C100584.002 Module Vers. 08 - 19 -
2.2 Signal path
♦ The input to an A-TIM is a coupled differential input amplifier. The output
signal of the input amplifier is passed on to two separate signal paths.
Each path is assigned to an A/D converter channel.
♦ DC-signal path (DC coupled processing path)
This signal path has continuous access to the entire raw signal,
including the available DC part of the signal.
In this path also the DC-operating point (sensor passive voltage)
resulting from the sensor power supply is acquired and monitored
(sensor OK-monitoring).
An error-free measurement chain is signalled through a green OK
LED on the 1-channel input module for AS- sensors.
♦ AC-signal path (AC coupled processing path)
This signal path has access only to the AC part of the raw sensor
signal. The dynamics of the processing can thus be used
completely for the vibration measurement. As a result the
acceleration signal from a connected sensor can be evaluated with
maximum resolution and accuracy.
The input range of the AC signal path is continuously monitored for
signal over-ranging. When over-ranging of an A/D converter occurs
this is signalled by a red LED on the front of the A-TIM.
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