V-Link datalogging transceiver size

2.5" by 3.5" by 1" ABS plastic, including mounting tabs, internal battery and screw terminal block input connector

Operating Temperature

-40 to +70 degrees Celsius

Integrated Li-Ion Battery

3.6 volt lithium ion recharegeable battery, 600 milliamp-hour capacity standard; in addition, the customer may supply external power from 3.1 to 9 volts

Rechargeable Battery Lifespan

~230 hours (estimated, using 80% @ 6 milliamps current draw for RF receive link active, 20% @ 28 milliamps for 1 ch. 350 ohm strain gauge bridge, and sensor RF transmit link active) ~57 hours estimated for rechargeable lithium battery

Data Storage Capacity

2 megabytes standard (approximately 1 million data points)

Data Sample Rate (logging)

programmable from 32 to 2048 sweeps/second standard; Note: one sweep represents one sample from all active channels

Data Sample Duration

programmable from 1 to 65,535 data sweeps; for 2048 sweeps per second, sample duration is 32 seconds

Acquisition Modes

Mode 1: transmit continually on command from base station, transmit duration programmable from 1 to 65,535 sweeps. Maximum continuous data rate for three channel sweep is 1 KHz
Mode 2: log on command from base station
Mode 3: autotrigger, user specified as a programmable threshold voltage from a specific channel

Analog to Digital (A/D) converter

successive approximation type, 12 bits resolution

Number Input Channels

programmable from 1 to 7 input channels: 4 full differential (Wheatstone bridge) inputs to instrumentation amplifier (90 dB CMRR minimum, 0-3 volts common mode maximum), and 3 single ended inputs (0-3 volts maximum)

Temperature Channel

-25 degrees Celsius to 70 degrees Celsius range, accuracy +/- 4 degrees Celsius

Pulsed DC Bridge Excitation

+3 volts DC at 50 milliamps maximum, pulsed DC 100 microsecond delay before sampling for energy conservation (applies to sweep rates below 256 Hz only)

Constant DC Bridge Excitation

+3 volts DC at 50 milliamps maximum (applies to sweep rates above 256 Hz only)

Programmable Gain

for differential input channels 1-4, user programmable from 30 to 3000 (gain can be reduced further w/ hardware resistor change)

Programmable Offset

user programmable through Windows software, maximum allowable input offset is+/- 1.5 volts

Radio Frequency (RF) Transceiver Carrier

916 MHz, narrowband, FCC compliant for license free use in the United States

RF Programming & Downloading

75,000 baud, wireless RF, pulse code modulated, ASK

RS-232 Programming & Downloading

115,200 baud direct serial RS-232 cable w/ miniature connector

Range for Bi-Directional RF link

200 feet typical, line of sight

Base Station size

3.0" by 4.0" by 1.5"

DAS Software

Windows 95/98/2000/XP PC compatible

Accelerometer Option

TBD

Accelerometer Triad Size

0.5" by .5" by .5" w/ screw mounted aluminum cube housing

Accelerometer Type

micromachined, piezoresistive, 3.5 k ohms impedance typical (IC Sensors model 3031)

Accelerometer Range

+/-50, 100, 200 or 500 G's capacity