Highlights |
• DSP centralized design with simple network connection
• 4 - 1024 input channels with excellent phase match
• PC Tethered mode or standalone Black Box mode
• 24 bit A/D and D/A ,130 dB input dynamic range
• Integrated IEPE output, charge amplifier, AC/DC coupling, TEDS
• Continuous recording for all channels at full sampling rate
• AC or DC power and backup battery
• Isolated digital I/O
• Bright LCD display
• Latest programming technology |
Application Functions
• Random
• Sine-on-Random
• Random-on-Random
• Swept Sine
• Resonant Search and Tracked Dwell
• Classic Shock, Transient, SRS
• Time Data Replication
• Limiting and Notching
• Shaker Diagnosis Tools
• Data Recording and Dynamic Signal Analysis
• Thermo Chamber Interface
Spider-81 is a highly modular, distributed, scalable vibration control system developed by Crystal Instruments. It represents the fourth generation of vibration control systems because its advanced technology is not seen in any other products. It includes a complete suite of vibration control modules including Sine, Random, Sine-on-Random, Random-on-Random, Classical Shock, SRS, Time Data Replication, and Dynamic Signal Analyzer functions.
DSP Centralized Architecture
Unlike traditional controllers that rely heavily on an
external computer for real-time operation, Spider is
the first controller that directly integrates timesynchronized
Ethernet connectivity with embedded
DSP technology. This strategy greatly increases the
control performance, system reliability, and failure
protection of the controller. It also allows large
numbers of channels to be configured without
sacrificing system performance.
Black Box Mode: Run without PC
The Spider-81 can run autonomously in Black Box
mode without a PC connected. In this mode, a PC is
used only to configure the control system before
operation and to download data after the test is
complete. During the test, the controller can be
operated according to a preset schedule or from a
variety of external devices, such as a control pendant,
Wi-Fi enabled PDA, or iPad.
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Simple Network Connection
Ethernet connectivity allows the Spider-81 to be
physically located far from the host PC. This
distributed structure greatly reduces the noise and
electrical interference in the system. One PC can
monitor and control multiple controllers over the
network. Since all the control processing and data
recording are executed locally inside the controller,
the network connection will not affect the control
reliability. With wireless network routers, the PC can
easily connect to the Spider remotely via Wi-Fi.
Latest Hardware Design
Spider-81 modules have voltage, charge, and IEPE
inputs which are ideal for shock, vibration, acoustic,
or general purpose voltage measurement. The internal
flash memory stores test configuration and real-time
analysis data for up to hundreds of channels
simultaneously. Multiple output channels provide
various signal output waveforms that are
synchronized with the input sampling rate. The front
panel has 5 function buttons and a bright LCD that
displays test status information. Ten monitoring
connections on each unit can be used to read the
signals of analog inputs and outputs. There are built
in isolated digital I/O and RS485 serial ports to
interface with other hardware. There is a connection
for an emergency abort button. Floating power design
reduces ground loop problems in the controller
installation.
Time Synchronization between Multiple Modules
The Spider-81 is built on IEEE 1588 timesynchronization
technology. Spider modules on the
same network can be synchronized with up to 100 ns
accuracy, which guarantees ±1 degree cross channel
phase match up to 20 kHz.
On-Board LCD Display
Each Spider-81 is equipped with a bright front panel
LCD that displays system status and test information.
Real-time status such as control RMS or sweeping
frequency can be instantly viewed.
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Designed for High Reliability
Spider-81 is the first vibration control system
designed for fail-safe operation even in the event of a
network or power loss. An internal backup battery
allows the controller to continue to function and save
status information in the event of a power loss.
Advanced safety routines allow sensor failures to be
detected within milliseconds. The Spider-81 hardware
passed strict environmental tests including EMI,
temperature, drop shock, sine, and random vibration.
The system is built tough to withstand the rigors of
the testing environment and for long-lasting
durability. The unique floating ground design reduces
ground loop problems in the installation.
ASAM-ODS Data and File Model
ASAM is an international organization that is
supported by more than 150 companies in the testing
and measurement industry. Spider-81 is fully
compliant with the ASAM-ODS data and file model.
With ASAM-ODS, the engineering unit, user control,
testing article description, and data exchange of
Spider-81 are all governed by the ASAM standard. The
Spider-81 data can be read by the software of LMS,
B&K, BBM, and many other providers.
Integrated with Dynamic
Signal Analysis
Spider-81 is integrated with general signal analysis
functions including time stream recording, transient
capture, FFT, auto power spectra, and transfer
function analysis. Multiple Spider-80 DSA modules can
work together with a Spider-81 VCS module as one
integrated system.
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Designed for High Control Performance
By using enhanced control algorithms and a simplified
DSP architecture, the feedback loop time of Sine and
Random control are greatly reduced. A reduced
control loop time enhances the capability of
resonance search and dwell and control for a
structure with high Q resonances. This also provides
faster responses for better safety protection.
Ease of Use
The Spider-81 software is further improved at the user
interface level. More graphic guidance, wizards, and
tools were added to make setup a snap. The interface
has been rearranged to make it more logical and more
useful. Event-Action rules, Abort-Sensitivity, and other
new interface features are used to simplify operation.
Searching through a large number of tests is easy
with keywords.
Designed for High Accuracy
Using a patented technology, Spider-81 is the only
vibration control system that achieves 130dB input
dynamic range. Each measurement channel can detect
signals as small as 6μV and as large as 20V. This
completely eliminates the need for the input range or
gain settings found on traditional controllers.
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Architecture Comparison |
| In the past four decades, vibration control technology has gone through four generations: standalone controller, PC-based, PC-tethered,
and fully networked. The Spider-81 represents the fourth generation ?fully networked, built on Ethernet with IEEE 1588
time synchronization. This configuration provides much greater flexibility, reliability, configurability, and scalability than before. |
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The 1st generation controllers did not use a PC. They
were built on mini-computer architecture with a
dedicated user interface. The PC played a critical role
in the 2nd, 3rd, and 4th generation systems.
In the 4th generation, the high speed data communication
and accurate time synchronization all happens over the
network. The PC is only an operator terminal and is not
part of the control system. The user has a choice to
control the system through a PC, wireless PDA, hardware
pendant, or through other devices.
The fully networked controller provides significant
advantages over previous generations. A user can
place the controller close to the shaker table and
operate the controller near the shaker or in a remote
control room a long distance away.
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Spider-81B Basic Version
The Spider-81B was developed to meet the
requirements of basic vibration testing applications. It
has 4 inputs, 1 output, and 4 pairs of digital I/O. The
software includes the Random, Sine, Shock, and RTD
testing suites.
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Summary of Hardware Specifications |
| Analog Inputs |
8 BNC connectors per Spider-81 module. Spider-81 and Spider-80 units can be networked to form up to 1024 inputs; charge, voltage or IEPE, single-ended or differential, AC or DC coupling, 130 dB dynamic range, 24 bit A/D converters, range ±20 volts, up to 102.4 kHz fs per channel |
| Analog Outputs |
2 BNC connectors per unit, 100 dB dynamic range, 24 bit A/D converters. ±10 volts |
| Channel Phase Match |
Better than ±1.0 degree up to 20 kHz among all channels |
| Peripherals |
8 isolated DIO; 10 monitoring channels, LCD display with navigation buttons, RS-485, ground connection,
abort contact switch, start and abort buttons |
| Dimensions |
440 x 66 x 330 mm (WxHxD) |
| Weight |
4.2 kg |
| Power |
Up to 18 watts during operation. Powered from external DC power or internal backup battery source |
| PC Connections |
100 BaseT, RJ45 female connector supports connection to PC or network switch |
| Internal Memory |
Flash memory for data storage: 4 GB per unit |
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