WBK16

8-Channel Strain Gage Module
Features• 8-channel strain gage module• 100% programmable; no pots to adjust• Full, half, and quarter arm support• 60 to 1000 Ohm bridge• Software-selected Shunt-Cal• Independent filter per channel• Programmable excitation source• Optional simultaneous sample andhold
The WBK16 is an 8-channel strain gagesignal conditioning module for WaveBooksystems. The WBK16 supports a wide
range of bridge values configured for full,
half, and quarter bridge configurations.
Excitation voltage with remote sensing
is supplied from an internal regulator,eliminating the need for an external voltage source. Also, one of two 4-pole filters
can be selected via software, if desired.
Up to eight WBK16s can be added to one
WaveBook, enabling up to 64 ­channels ofstrain to be measured. For higher channel
capacity, a multi-WaveBook system can be
configured using the WaveBook/516E, fora maximum of 256 strain gage channels
in one system.

The WBK16 provides eight channels of strain gage input for the WaveBook

WBK16 Strain Gage Module Block Diagram
CH 8DB9connector

Measurement Computing

BufferSense
User
configured
softwareselected bridge
completion
andshunt cal
network

Programmablegain circuitry

ProgrammableoffsetreferenceµP andcontrol
logic

4 poleLP filter
plus
AC/DC
coupling

Sense
Excitation –Programmable
excitation
and regulation

All input signals are attached via eightDB9 connectors mounted on the frontof the unit.

Excitation Source. The WBK16’s excitation source is accurate to ±5 mV with very
low drift over time. The dual excitation
sources are set through software for 0.5,
1, 2, 5, and 10 volt excitation, and can beused in either a standard or 6-wire Kelvinconfiguration. Each channel is individuallycurrent limited to 85 mA to protect against
accidental shorts. In most applications, toeliminate the problems associated withbridge overheating, you will want to select the lowest possible excitation voltage
which yields satisfactory results.

CH 2

One of eight channels

Excitation +In addition, the WBK16’s wide gain ranges
and filter selection (see below) make it anexcellent general purpose or high gain
­amplifier for other transducer inputs.

Programmable Gain Amplifier. Each of theWBK16’s eight channels has an independent gain stage, software programmable in86 steps from 1 to 20,000. This provides
optimal gain for any strain application.

Multiplexed
analogoutput toWaveBook

FromWaveBook
ControlbusFiltering. Both high-pass AC coupling
and low-pass noise rejection filtering canbe enabled through software. Two 4-pole
Butterworth filters factory-set to corner frequencies of 10 Hz or 1 kHz can be selected.
The filters can be field modified over a rangeof 2 Hz to 20 kHz simply by inserting auser-supplied resistor pack.
Ease of Configuration. Unlike most strain
modules with a single fixed configuration, the WBK16 allows multiple bridge­configurations to be established, in advance, on a user-installed header. Once
installed, each configuration can be ­selected
through software at the time of operation.
­Depending on your ­configuration, there(508) 946-5100

1

may be no need to open the unit just because
your transducer changes from full to quarter
bridge or from 120 to 350 Ohm resistance.
Simply change it in software. Each header
supports two half bridge resistors, threequarter bridge values and three shunt calvalues per channel.
Shunt-Calibration. The WBK16 features
three user-installable, software-selectedshunt-calibration resistors. This enables
each channel to be put into a known imbalance condition to set or verify channel
calibration. Shunt-cal allows a full scale
gain to be set without physically loading
the bridge to capacity.

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WBK16Specifications & Ordering Information
SoftwareGain adjustments, bridge balancing and other sensor calibration with theWBK16 is effortlessly handled with WaveView, IOtech’s Out-of-the-Box software
for WaveBook systems. The sensor calibration portion shown below enables astrain gage or transducer application to be easily configured, calibrated, andset up using an intuitive graphical user interface with guidance through theconfiguration and calibration.
CN-189 and CN-115 header connectors provide bridge completion
Filtering: 4-pole Butterworth software selectable andfactory set to 10 Hz, 1 kHz, or bypass; field changeable
Power Consumption: 1.0A @ 15V (min)				 1.7A @ 15V (max)Operating Temperature: 0 to 50 ˚C
Storage Temperature: 0 to 70 ˚CHumidity: 0 to 95% RH, non-condensing
Dimensions: 285 mm W x 221 mm D x 45 mm H
(11” x 8.5” x 1.75”)
Weight: 1.32 kg (2.9 lbs)
Vibration: MIL STD 810, category 1

Auto Balance with Auto-zero. Balancing
the bridge is quick and convenient. No
pots to adjust, LEDs to monitor, or dials totwist. Simply select the channels to auto
balance and the WBK16 does the rest. Autobalance removes the static portion of thestrain load and auto zeros the input tocompensate for any input drift.
Simultaneous Sampling. The WBK16/SSHadds simultaneous sample and hold capability to all eight input channels. Whenmultiple WBK16/SSH modules are ­installed,
all channels on all modules sample within
100 ns of one another.

Measurement Computing

Specifications

Ordering Information

Input Connector: Standard female DB9 per channel.
Channels: 8
Input: Differential
Input Impedance: 100M Ohms
Power Requirements: 10 to 30 VDC or 120/240 VAC
with included adapter
Coupling: AC and DC software selectable
Accuracy:
Offset Drift: 1µV RTI/ ˚C
CMRR @ DC to 60 Hz: 100 dB at gains > 100
Cross Talk Rejection: > 90 dB @ less than 1 kHz
Bandwidth:
50 kHz @ gains <1 to 100
10 kHz @ gains >100 to 2000
1 kHz @ gains > 2000
Bridge Configuration:
Full Bridge (4 and 6 wire)
Half bridge
Quarter bridge (2 and 3 wire)
Bridge Completion: User supplied resistors on­removable headers (included)
Bridge Resistance: 60 to 1000 Ohms
Overall Gain: 1 to 20,000, software selectable in
86 steps
Shunt Calibration: Software selection of 3 user supplied resistors
Auto-Balance: Selected per channel
Auto-Calibration: Either by actual measurement or
calculated load
Offset Adjustment:±3V RTI @ gains 1 to 10±300 mV RTI @ gains 10 to 100±30 mV RTI @ gains 100 to 2000
±3 mV @ 2000 to 20,000
Excitation Source: Two independent banks setable
to 0.5V, 1V, 2V, 5V, 10V and off
Excitation Accuracy: ±5 mV
Excitation Capacity: 85 mA per channel with foldback
current limiting(508) 946-5100

2Description
8-channel strain gage module,including AC adapter
8-channel strain gage module withsimultaneous sample and hold,including AC adapter
Load cell shunt cal option for WBK16

Part No.
WBK16

WBK16/SSH
WBK16/LCAccessories & Cables
Rack mount kit
RackDBK2
120 Ohm bridge resistor
BCR/120/1
350 Ohm bridge resistor
BCR/350/1
1000 Ohm bridge resistor
BCR/1000/1Header connector
CN-115Connector/adapter DB9 to screw terminal CN-189
5-pin male DIN to 5-pin male DIN
provides convenient connection
between WaveBook power input
connectors and DBK30A (alsoused to daisy-chain input power
to WBK expansion modules)
CA-1155-pin DIN to automobile cigarette
lighter power cable
CA-116

Product Compatibility✔ WaveBook

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