WBK188-Channel Dynamic Signal Conditioning Modulewith TEDS SupportFeatures• Eight channels of dynamic signal ­input
for the WaveBook or ZonicBook• Built-in IEPE biasing (4 mA), software
selectable per channel• AC or DC coupling, software selectable
per channel• Simultaneous sampling on all ­channels• 8-pole Butterworth low-pass filter,
programmable on a per-­channel ­basis
from 10 Hz to 50 kHz• Programmable overrange detection• IEPE fault detection• TEDS support for accelerometers• 25 VDC input range for proximitysensors• AC excitation source• 8 signal outputs for use as signal conditioning only
• Each input channel is provided as aconditional analog output on rear panel
The WBK18 provides 8 channels of dynamic
signal input for WaveBook or ZonicBook
systems. The WBK18 provides all of the signal
conditioning and biasing required for the system to accept piezoelectric accelerometers,piezoelectric pressure sensors, piezoelectric
microphones, proximity sensors, or any
other dynamic input source. All channels on
the WBK18, and on other WBK18 modules
within the same system, are sampled simultaneously to insure phase matching between
channels. Each WBK18 channel features asoftware programmable 8-pole low-pass filter
to remove undesired frequencies and aliascomponents. Data integrity is additionallyinsured through overrange and IEPE fault
detection mechanisms.
Each WBK18 channel has independent
software control for AC or DC coupling,
IEPE biasing (0 or 4 mA), programmablegain, and low-pass filter cutoff frequency.
The WBK18 also includes a built-in programmable voltage excitation source for
exciting other system elements such as
shakers or speakers.
Up to 8 WBK18s can be attached to
one WaveBook for a total IEPE sensor
capacity of 64 channels (56 channels on­ZonicBook). For applications where morethan 64 ­channels are required, or where
the per-­channel ­bandwidth is higher thanwhat a single ­WaveBook can support, up
Measurement Computing

The WBK18 provides a full set of features for making dynamic signal measurements

WBK18 Block Diagram
CH 8

Multiplexed
analogoutput toWaveBookExpansion
signal BNC

CH 2
One of eight channels+VTransducer bias
current source

Filterbypass

ICP fault
detection
SignalinputBNC

Selectable
AC/DCcoupling

PGASample
and holdSignal
conditioning
analog output

Buffer

ProgrammablefilterOver-range
detectionµP andcontrol
logic

TEDS
communication
BNC

50 OhmExcitation
sourceoutputFilter andamplifier

Waveform
generation
Controlbus

to four WaveBooks can be synchronizedin one system for a total system capacityof 256 IEPE inputs.
Programmable Coupling/Gain. Each of theWBK18’s eight inputs feature per channel
software selection of AC/DC coupling andinput gain range selection. A 0.1 Hz and1 Hz high-pass cut-off selection is available
in AC coupling mode with gain ranges from
25 mV to 5V full scale. In DC coupling
mode an extra 25V range is available for­proximity sensor measurements.

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1

From
WaveBook

Flexible Input. When not using an IEPE transducer the current source can be ­individuallydisabled allowing connection of non-IEPE,
high-output transducers or pre-conditioned
signals from charge amplifiers.
Low-Pass Filter. For dynamic signal inputs
each channel features an 8-pole ­Butterworth
low-pass filter, programmable on a per­channel basis from 10 Hz to 50 kHz in a1-2-5 progression. This filter provides at least
75 dB of alias rejection to the ­WaveBook’s
A/D ­converter. For DC inputs such as

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WBK18Specifications & Ordering Information­ roximity probes, LVDT’s or other lowpfrequency inputs where aliasing is less ofa concern and the static DC value is morecritical, a 2-pole filter is also available oneach of the eight channels.
Simultaneous Sample & Hold. All WBK18
channels are sampled simultaneously,
after which the WaveBook or ZonicBook
measures each output until all channels aredigitized*. The time-skew between channels is 100 ns, regardless of the number of
WBK18s connected to the WaveBook orZonicBook. The WaveBook’s eight built-inchannels can also be sampled simultaneously if the WaveBook is equipped witha WBK11/HR or WBK13A simultaneous
sample and hold option card.
Overrange Detection. Hardware overrange
detection is built into the WBK18, with
LEDs for each channel on the front panel
for visual indication of an error condition.
The overrange level is programmable as apercentage of range and is continuously
monitored during an acquisition. Moreover, an error condition is latched until
the commencement of a new acquisition.
However, an overrange event does not stop
the acquisition process or change the data,providing the user with full control overthe disposition of data. In addition to front
panel indicators, an overrange conditionis also detectable by requesting status via
software at the end of an acquisition.
IEPE Fault Detection. IEPE fault detectionis also provided, with a front panel LED
indicator for each channel. This hardware
detection monitors for an open as well asa shorted transducer connection. Because
it is continuously monitored during anacquisition, even intermittent faults aredetected and latched. As with overrange
detection, detection of this error condition
does not alter the acquisition process or
its data, and fault status is available via
software at the end of an acquisition.

TEDS Support. TEDS, Transducer Electronic
Data Sheet, is a sensor feature referring to thestorage of calibration information within
the sensor. The WBK18 can read calibration
information from TEDS-compatible sensors
and automatically scale the readings fromeach sensor using the acquired calibration
information. TEDS support is a software
option for the WBK18, and can be easily
added after the initial purchase.
Excitation Source. The WBK18’s AC excitation source is a sine wave-based voltage
source that is programmable in frequency
from 1 Hz to 5 kHz and in amplitude from
100 mVp-p to 10 Vp-p. Continuous sine,and Sweep sine modes are available. It
can be used as a test source for the input
channels or as excitation for other systemelements, such as the amplifier for a shakertable. All of its parameters are software
controlled, and its output is conveniently
provided on a front panel BNC connection.
Power. The WBK18 can be powered by an
included AC power adapter or directly fromany 10 to 30 VDC source, such as a 12V
car battery. For portable or field applications, the WBK18 and the WaveBook can
be powered by the DBK30A rechargeable
battery module.
Included Software Support:• WaveView Out-of-the-Box software• DaqCOM ActiveX/COM support for
Visual Studio® and Visual Studio®.NET• DASYLab® drivers• LabVIEW® VI examples• eZ-Analyst support• eZ-TOMAS support(508) 946-5100

GeneralInput Power Range: 10 to 30 VDCPower Consumption@ 12V:  19.2W@ 15V:  19.5W@ 24V:  19.2W
Environment
Operating: 0 to 50 ˚C; 0 to 95% RH, noncondensing
Storage: 0 to 70 ˚C
Vibration:  MIL STD 810E, category 1Dimensions: 280 mm W x 216 mm D x 45 mm H
(11” x 8.5” x 1.75”)
Weight: 1.3 kg (2.9 lbs)

Analog Inputs
Channels:  8Signal Connection: 1 BNC per channel
Input Impedance:  200k Ohm (single-ended)
Input Coupling:   AC, DC (software programmableper channel)
High-Pass Filter: 0.1 Hz or 1 Hz (software programmable per channel)
Input Ranges: ±25V (DC coupled only), ±5V, ±2.5V,±1V, ±500 mV, ±250 mV, ±100 mV, ±50 mV, ±25 mV(software programmable per channel)
Overrange Detection:   Programmable from 1% to100% of range
Overrange Indication:  Front panel LED per channel,
software status
Low-Pass Filter (software programmable per channel)
Type:   8-pole Butterworth with simultaneous
sample-and-hold (SSH)
Cutoff Frequency (Fc):  10 Hz to 50 kHz in 1-2-5
progression
Alias Rejection:  75dB min
Channel-to-Channel Phase Matching**:  1˚ typ,2˚ maxUnit-to-Unit Phase Matching**:  1˚ typ, 2˚ max
SSH latency:  100ns max
Amplitude Accuracy†: ±0.5dB (Fin ≤ Fc/2)
Total Harmonic Distortion:  -70dB typ
IEPE Bias Source: 4 mA, 24V compliance (on/off
software programmable per channel)
IEPE Fault Detection Thresholds: <1V (short), >25V(open)
IEPE Fault Indication:  Front panel LED per channel,
software status

Excitation Source
Channels:  1Signal Connection: BNC
Frequency Range: 1 Hz to 5 kHz
Frequency Resolution: 0.01 Hz
Amplitude Settings (p-p): 10V, 5V, 2V, 1V, 500 mV,200 mV, 100 mV, 50 mV
Waveform Modes: Continuous sine, Sweep sine
Output Impedance: 50 Ohm
Accuracy:  ±0.1dB

Ordering Information* When using a WaveBook system with a WBK11/HR, WBK13A, WBK16/SSH, or WBK18, the perchannel sample rate is 1 MHz where n=number of active channels(n + 1)** Conditions: 8-pole LPF mode, 0.1 Hz, 2 Hz, or DC HPF mode; 1 Hz ≤ Fin ≤ Fc/2; 200 Hz ≤ Fc ≤ 20 kHz;all WBK18 units connected to same WaveBook† For Fin ≤ 20 kHz

Measurement Computing

Specifications

2Description
8-channel dynamic signal conditioning
module for the WaveBook
and ZonicBook

Part No.
WBK18

Product Compatibility✔ WaveBook✔ ZonicBook

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