The Trident 305 is an industry leading digitizer, designed for use with the
Taurus Portable Seismograph or Cygnus transceiver. The Trident 305 features
24 bit performance in a compact, robust package offering typical dynamic range
of 142 dB. The Trident 305 Digitizer’s versatility allows for an optimal
network design flexibility. Numerous Trident 305 digitizers can be daisy-chained
to form a multi-channel system. Such scalability makes Trident 305 well suited
to fixed, portable and structural monitoring networks. Because the Trident 305
Digitizer includes comprehensive seismometer control functions, it allows for
seismometer mass centering, mass positioning, monitoring and calibration from a
central site: eliminating the need for frequent site visits.
Since the Trident 305 is not packaged with communications interface and timing systems,
it can be deployed within the seismometer vault’s temperature stable environment for
improved long period performance and superior data quality.
In addition, the Trident 305 Digitizer supports bi-directional data communications,
timing and power distribution, allowing for a simple twisted-pair NMXbus cable between
the digitiser and the communications interface. This feature eliminates the need to
use long RF and GPS cables to accommodate the positioning of GPS, VSAT or RF antenna:
reducing cost and increasing site configuration options.
Superior performance, true 24-bit resolution with 142 db dynamic range
Versatile software programmable front-end gain to support a wide range of sensor types
Remote mass centering and calibration functions, ideal for broadband applications
NMXbus technology provides freedom in placing remote site components
Complete system response calibration using pseudo-random binary signals
Scalable design that allows individual 3-channel units to be configured separately and daisy-chained for multi-channel systems
SENSOR INPUTS
Channels:
3 (6-channel configuration achieved by daisy-chaining two units)
Sampling:
Simultaneous
Input Voltage Range:
40V peak-to-peak differential (at gain=0.4)
Gain Selection:
Software selectable 0.4,1,2,4,8
Selectable sensitivity common for all 3 channels
EMC:
EN55022, EN55011 FCC Part 15
PERFORMANCE
Shared Input Noise:
0.5 counts RMS (of 24 bits)
Dynamic Range:
142 db typical (max. sine wave above shorted input level)
DIGITIZER
Type:
Proprietary high order sigma-delta
Digital Filter:
140 db attenuation at output Nyquist frequency
Filter Type:
Linear Phase
DATA OUTPUT
Output channels:
1,2 or 3
Output Sample Rates:
10,20,40,50,100,200,500 sps
NMXbus ports:
2
COMMAND AND CONTROL
Calibrate:
Initiates calibration sequence
Mass Centre:
Initiates mass centering
Configuration:
Get/Change/Save/Copy current configuration
Software Upload:
Upload new firmware
Test Code:
Allows the user to test new code downloaded via the NMXbus
Reboot:
Reboots the digitiser
POWER
Supply Voltage:
9-36 V (over NMXbus)
Power Consumption:
1.8W typical, 100 sps continuous aquisition
Protection:
Reverse-voltage and over-voltage protected
Self-resetting over-current protection
ENVIRONMENT
Operating Temp:
-20°C to +55°C
Packaging:
Machined aluminum, IP-67 compliant
INSTRUMENT STATE-OF-HEALTH
Power Supply Voltage:
DC Voltage from NMXbus
Temperature:
Internal temperature
3 External Inputs:
Input voltage, commonly used for mass position
Diagnostic SOH:
A number of software diagnostic and statistical counts are also included as SOH messages
TIMING SYSTEM
Type:
UTC timed with digitally controlled VCXO clock disciplined by GPS time code receiver
