Data Acquisition System
Each
TDAS G5 DAS module is a completely independent data acquisition system
that can be used stand-alone or linked together to create large test
set-ups. Also, DTS has added High Bandwidth options
for applications requiring data bandwidths up to 40 KHz.
Overview of TDAS G5 DAS Features
Communication Method
TDAS G5 supports the industry-standard Ethernet 10/100 Base T/Tx communication method.
Input Range
The nominal sensor input range is +/- 2.0 volts (differential) at a gain of 1. The maximum common-mode voltage range is 0.5 to 4.5 volts.
Excitation Sources
All excitation sources are individually regulated and limited to ensure
reliable operation even with shorted cables. The standard excitation voltage
is 5.0 volts.
Shunt Emulation
The TDAS G5 DAS uses shunt emulation to perform shunt checks. Shunt emulation
eliminates the need for conventional shunt resistors and is enabled when
"Emulation" is chosen in the SIF as the shunt calibration method. This
method applies a precise current to a connected sensor and checks for
expected deflection based on sensor impedance. Shunt checks are performed under
software control.
Hardware Filters
Each TDAS G5 DAS measurement channel has a fixed four-pole Butterworth
anti-aliasing filter with a standard -3 dB knee point at 4000 Hz. Each
channel also has a software-controlled, variable five-pole Butterworth
filter, which is adjustable from 50 to 5000 Hz. These two filters may
be used together to provide an effective Butterworth response with up
to nine poles. The TDAS Control software automatically chooses the best
filter setting for a chosen sampling rate.
EID Support
Each TDAS G5 DAS measurement channel supports communication with silicon
serial number devices manufactured by Dallas Semiconductor/Maxim Integrated
Products. When you connect an ID chip to the proper pins on the sensor
connector, the TDAS Control software can automatically read these devices
and correlate the serial number with channel set-up information stored
in a Sensor Information File (SIF).
Memory Size
Each TDAS G5 DAS contains 50 MB of volatile RAM and 5 MB of non-volatile
flash memory. For each sensor channel, the maximum samples available via
RAM is 10K samples/second for 70 seconds; for flash memory, the maximum
samples available is 10K samples/second for 7 seconds.
Shock Rating
TDAS G5 DAS units are designed to function routinely in a 500 g environment
such as that experienced in severe in-dummy applications. All vehicle-/sled-mounted
systems are rated for and fully tested to 100 g's, 12 mS duration, in
all axes. TDAS G5 equipment can be mounted directly on a vehicle, sled
or other dynamic testing device.
Temperature Rating
The TDAS G5 DAS uses extensive power management to minimize heat generation.