8-channels built-in, expandable up to 64 channels per StrainBook
Multiple StrainBooks can be synchronized for applications >64 channels
Expansion options for voltage, temperature, vibration, and sound measurements
High-speed Ethernet interface for continuous measurement transfer to the PC
1-MHz scanning A/D converter, with simultaneous sample and hold on each channel, guaranteeing channel-to-channel phase match to within 100 nsec
100% programmable, no mechanical 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
DC operable for in-vehicle applications Software
Includes WaveView™ for Out-of-the-Box™ setup, acquisition, & real-time display:
– Scope mode for real-time waveform display
– Logger mode for continuous streaming to disk
Support for Visual Studio® and Visual Studio® .NET, including examples for Visual C++®, Visual C#®, Visual Basic®, and Visual Basic® .NET
Comprehensive drivers for DASYLab®, LabVIEW®, and MATLAB®

StrainBook/616™ is a compact and portable strain gauge measurement system that connects to your PC’s Ethernet port. Eight channels of strain measurement are built into the StrainBook, and up to 64 channels can be measured with one StrainBook using 8-channel WBK16™ options. For applications with more than 64 channels, multiple StrainBook system scan be combined and synchronized for a virtually limitless number of strain measurement channels. The StrainBook is also capable of measuring voltage, temperature, vibration, and sound using other WBK signal conditioning options.
WaveView™ software is included with the StrainBook, providing all set-up, data acquisition, real-time display, and storage to disk without having to program. WaveView
supports up to 64 channels of strain, voltage, or sound/vibration inputs. For applications
beyond 64 channels, or for custom applications, comprehensive drivers are included for all Windows languages, LabVIEW®, and DASYLab®.

Built into the StrainBook is a 16-bit, 1-MHz A/D converter that can scan all selected channels at 1 µsec per channel, and continuously transmit acquired data to the PC in real time. Simultaneous sample and hold amplifiers on every channel insure that all channels are measured within 100ns of each other. The only limit to the amount of data acquired or the duration of a test is the storage capacity on the host PC. If all 8 channels of the StrainBook are configured, then the maximum sample rate per channel would be
125 kHz. If 64 channels of strain are configured, then the maximum rate per channel would be 1M/64 = 15.6 kHz per channel.

The StrainBook supports a wide range of bridge values for full-, half-, and quarter bridge configurations. Excitation voltage with remote sensing is supplied from an internal supply, eliminating the need for an external voltage source. The StrainBook’s wide gain ranges and filter selection (see specifications) also make it an excellent general purpose or high gain amplifier for other transducer inputs. All input signals are attached via eight DB9 connectors on the front of the unit. Each of the eight channels has an independent gain stage, software programmable in 86 steps from 1 to 20,000, providing optimal gain
for any strain application. The 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 be used in either a standard or 6-wire Kelvin configuration. Each source is individually current limited to 85 mA to protect against accidental shorts. Both high-pass AC coupling and low-pass noise rejection filtering can be 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 user-modified over a range of 2 Hz to 20 kHz simply by inserting a user-supplied resistor pack.

Unlike most strain instruments with a single fixed configuration, the WBK16 allows
multiple bridge configurations to be established in advance on a user-installed header.

Once installed, each configuration can be selected through software at the time of operation. Each header supports two half bridge resistors, three quarter bridge values and three shunt cal values per channel. All configurations can be selected via software on a
per-channel basis.

Three user-provided, software-selectable, shunt-calibration resistors can be installed on each channel, enabling each to be put into a known imbalance condition to set channel calibration. Shunt-Cal allows a full scale gain without physically
loading the bridge to capacity.

Balancing the bridge is quick and convenient, since there are no pots to adjust. Simply select the channels to auto-balance and the StrainBook does the rest. Auto-balance removes the static portion of the strain load and auto zeros the input to compensate for any input drift.

Scan and Trigger Configuration
The StrainBook’s powerful event-capture capability is made available through the simple, fill-in-the-blank style dialog boxes in WaveView. In addition to single-channel, manual, and external TTL triggering, advanced triggering for multichannel, digital pattern, and pulse trigger is also available. When using multichannel trigger all channels can be combined with Boolean "AND" & "OR" operators to begin the acquisition at the right time. In digital pattern mode, the StrainBook triggers on a user defined bit pattern making it easy to associate analog data with digital sequences.

Scope Mode
Unlike a traditional scope with only two to four channels, WaveView’s Scope Mode allows any eight channels within a system to be displayed. WaveView is not handicapped by the small memory limitations of DSOs, and dynamically and transparently allocates a PC’s RAM prior to beginning an acquisition. A simple point-and-click is all that’s necessary to initiate acquisitions. Because the data is already in the PC’s RAM, a second
point-and-click on the disk icon automatically saves data to disk for import into eZ-PostView™, a post-acquisition waveform review package included with WaveView, or into analysis packages, such as MATLAB®, DADiSP™, or Excel®.

Logger Mode
For applications where PC RAM is insufficient to record the entire test or where rapid back-to-back recordings need to be saved to disk, WaveView provides a Logger Mode. It complements WaveView’s Scope Mode by allowing continuous data recording directly to disk. Logger Mode can auto-increment file names to provide the unattended capture of millions of back-to back events, without user intervention. Acquired data can be stored in several data formats for direct import to packages such as MATLAB®, Excel®, or eZ-PostView™.

Expansion Options
WBK10 – Adds 8 differential analogue inputs
WBK15 – Provides 8 isolated analogue input channels
WBK16 – Provides 8 channels of Strain Gauge Input
WBK18 – Provides a full set of features for making dynamic signal measurements.
WBK41 – Provides Thermocouple & Counter inputs.

For more information, click here...

June 2007

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