Measurement-computing WBK18 Instrukcja Użytkownika

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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
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
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Podsumowanie treści

Strona 1 - Description

WBK18 Dynamic Signal Conditioning Module Description…… 1 Current Source with Transducer Fault Detection…… 2 Input Coupli

Strona 2 - Input Coupling

Gain of 8-pole Filter Mode-100-80-60-40-20000.511.522.533.54FIN/FCGain (dB) Gain of 8-pole Filter Mode-14-12-10-8-6-4-200 0.2 0.4 0.6 0.8 1 1.2Gain (

Strona 3 - Overrange Detection

Using the 2-pole Filter and Bypass 2-pole Filter Mode For applications where the signal of interest is entirely AC in nature, the low-pass filter mode

Strona 4 - Excitation Source

Bypass Mode Bypass mode also provides excellent passband accuracy and provides minimal signal attenuation up to very high frequencies for those applic

Strona 5 - Hardware Setup

DC Accuracy As previously mentioned, the 2-pole and Bypass filter modes are most commonly used in applications where DC signal information is importan

Strona 6 - CAUTION

Excitation Source In order to configure the excitation source, click on the Configure Sine Wave Output button in the Module Configuration window. Thi

Strona 7 - Software Setup

Sweep Mode (continued) Example of a Linear Sweep Waveform Example of a Log Sweep Waveform WBK18, Dynamic Signal Input Module

Strona 8

Custom Mode In this mode, the user can create customized waveforms built out of specified sine wave-based components. For example, a waveform could

Strona 9 - Maximizing Alias Protection

How to Save or Open Output Sine Wave Configuration Files Within all modes, there is the ability to save and recall waveform configurations, which is

Strona 10 - Gain of 8-pole Filter Mode

Using Accelerometers Overview A low-impedance piezoelectric accelerometer consists of a piezoelectric crystal and an electronic amplifier. When str

Strona 11 - Gain of 2-pole Filter Mode

Sensitivity The sensitivity of an accelerometer is defined as its output voltage per unit input of motion. The unit of motion used is “g.” One “g” i

Strona 12 - Gain of Bypass Mode

The WBK18 module includes a built-in programmable voltage excitation source. This source can be used to stimulate dynamic systems for transfer functi

Strona 13 - Module Configuration

Overload Recovery Recovery time from clipping due to over-ranging is typically less than 1 ms. Recoveries from quasi-static overloads that generate h

Strona 14

Fuse Replacement – for WBK18 CAUTION Turn OFF the power to, and UNPLUG the WBK18 module and all connected equipment. Remove all signal I/O line

Strona 15 - WBK18, pg. 15

1. If you have not already done so, turn OFF the power to, and UNPLUG the WBK18 module and all connected equipment. Remove all signal I/O lines fr

Strona 16

Specifications – WBK18 Specifications are subject to change without notice. General System Connectors: BNC connecto

Strona 17 - WBK18, pg. 17

Excitation Source Channels: 1 Signal Connection: BNC Frequency Range: 1 Hz to 5 kHz Frequency Resolution: 0.01 Hz Amplitude Settings (p-p): 10V,

Strona 18 - Using Accelerometers

Typical Performance Characteristics WBK18 Frequency Spectrums (typical) Each spectrum was taken from a WaveBook/516A that was sampling at 20kSamples/

Strona 19 - WBK18, pg. 19

WBK18, pg. 26 926896 WBK18, Dynamic Signal Input Module

Strona 20

Low-Pass Anti-Aliasing Filter Each channel features a programmable low-pass filter to provide alias protection and to allow for the removal of undesi

Strona 21 - Fuse Replacement – for WBK18

TEDS Support TEDS, Transducer Electronic Data Sheet, is a purchased option. The TEDS feature enables a WBK18 module to access the calibration informa

Strona 22

Hardware Setup Configuration The WBK18 requires no physical hardware settings. All WBK18 configurations are controlled by software. Reference No

Strona 23

To ensure that the software recognizes all system components, when powering up an Ethernet connected WaveBook system, it is important that the WaveB

Strona 24

Software Setup General Depending on your application, you will need to set several software parameters. Proper settings will allow WaveView to organ

Strona 25

Source Level – Source Level refers to the transducer bias current and is not to be confused with the excitation source that is discussed on pages 4 a

Strona 26

Maximizing Alias Protection What is Aliasing? Aliasing is a phenomenon of sampled data systems wherein a high frequency signal is misrepresented as a

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