Spider DSA User’s Manual
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The Spider-81 hardware modules have voltage, charge, and IEPE inputs which
are ideal for shock, vibration, and acoustic measurement or general-purpose
voltage measurement. The internal flash memory stores test configuration data
for controlling up to hundreds of channels simultaneously and stores real-time
analysis data. Multiple output channels provide various signal output waveforms
that are synchronized with the input sampling rate. A bright LCD displays testing
status information. Ten monitoring connections on each unit are used to read
signals of analog input and output. The front panel has intuitive function buttons.
There is a built-in isolated digital I/O to interface with other hardware.
Ethernet connectivity allows the Spider-81 to be located far from the host PC. This
distributed structure greatly reduces noise and electrical interference in the
system. One PC monitors and controls multiple controllers over the network.
Since the control processing and data recording are executed locally inside the
controller, the network connection does not affect control reliability. With
wireless network routers, a PC connects easily to the Spider-81 remotely via Wi-Fi.
The Spider-81 is built on IEEE 1588 PTP time synchronization technology (PTP-
Precision Time Protocol). Spider-81 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. With such unique technology and high-speed
Ethernet data transfer, the distributed components on the network truly act as
one integrated system.
The Spider-81 in Black Box mode enables operation without a PC. In this mode, a
PC is used only to configure the control system before the system starts operation
and to download data after the test is completed. During the test, the controller
operates according to a preset schedule or from a connected iPad. Black Box
mode is included with every Spider-81/81B.
For hardware with version 5.8 and lower, up to 4 tests are uploaded and stored on
each module. For hardware with version 7.2 and higher, up to 8 tests are
uploaded and stored on each module.
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 is instantly viewed on the LCD.
The Spider-81 is the very first vibration control system designed for fail-safe
operation even in the event of network or power loss. Advanced safety routines
allow sensor failures to be detected within milliseconds. All Spider-81 hardware
passes strict environmental tests including EMI, temperature, drop shock, sine
and random vibration. The system is built to withstand the rigors of the testing
environment with long-lasting durability. The unique floating ground design
reduces ground loop problems typically found in testing laboratories. A power-
backup circuitry based on super-capacitor is installed to prevent the unexpected
power loss.
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