Measurement Computing WBK18 - Manual

WBK18 Dynamic Signal Conditioning Module
Description…… 1
Current Source with Transducer Fault Detection…… 2
Input Coupling …… 2
Programmable Gain Amplifier (PGA) …… 2
Low-Pass Anti-Aliasing Filter …… 3
Overrange Detection …… 3
Simultaneous Sample and Hold …… 3
TEDS Support …… 4
Excitation Source …… 4
LEDs …… 4
Hardware Setup …… 5
Configuration…… 5
Power…… 5
Assembly…… 6
Input Connections ……6
Software Setup …… 7
General ……7
Maximizing Alias Protection ……9
Using the 2-Pole Filter and Bypass……11
Module Configuration …… 13
Using Accelerometers …… 18
Overview …… 18
Accelerometer Specification
Parameters …… 18
Electrical Grounding…… 20
Cable Driving…… 20
Fuse Replacement …… 22
Specifications …… 24
Description
The WBK18 is a dynamic analog signal input module for the WaveBook data acquisition system. The
WBK18 provides a complete system to interface to piezoelectric transducers that include accelerometers,
microphones, force/pressure transducers, and others.
WBK18, Front and Rear Panel Views
Each WBK18 channel features:
a 4 mA current source for transducer biasing •
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hardware detection of a transducer fault
AC (0.1 Hz or 10 Hz) or DC coupling
a programmable gain amplifier (range selection)
hardware overrange detection
an anti-aliasing low-pass filter
a simultaneous sample-and-hold (SSH) amplifier
support for optional TEDS (Transducer Electronic Data Sheet), if purchased
All of these parameters are independently controlled in software on a per channel basis except
for overrange detection level, which is set on a per module basis.
WBK18, Dynamic Signal Input Module 926896 WBK18, pg. 1