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Model 6840, Turnkey Strain/Bridge/LVDT Data Acquisition System



Features

  • 8, 16, 24 or 32 Channels Strain/Bridge/LVDT Input
  • 10kS/s 16-Bit Digitizer
  • Bridge Completion, Remote Sense, Shunt Calibration Lowpass Filters
  • RJ45 Input Connector
  • IRIG Time A, B or G
  • PI660 Turnkey Software Included
  • Shipping Container

Description

Series 6800 for portable applications is a ready-to-run, high performance measurement system that is DC powered for mobile applications. All connections are front mounted for easy installation in tight places or on the go. 6800 systems come equipped with a conditioner, amplifier, filter and digitizer. Each channel has a front mounted RJ-45 connector for 8-wire bridge transducers. Individual channels have a differential ±10V input and can digitize and record data to 16-bit resolution with upper and lower programmable alarm capability that is checked each time the output is digitized. Solutions are available for providing digital outputs based on these alarm conditions.

Systems interface to a familiar Windows based Operator Workstation over USB where the included software, PI660, is used for setup, display and acquisition of measurement data. PI660 allows for acquisition and control of one or many 6800 systems and provides real time data display. Data can be displayed and recorded in any number of ways, creating a versatile system that can fit any application and can be easily expanded or customized, should test requirements change.

Multiple systems can be combined for larger and/or distributed installations, made capable with an onboard, distributed sample clock bus. Programming and data transfer are over USB which provides high data transfer rates with low, predictable latency. It interfaces to the USB port provided on most PC computers, including laptops for ultimate portability.

Data Redundancy is optionally available. A 2.5" HD (Model 6095) mounts on the USB controller board in each system and provides a redundant recording point for the DAS. In the unlikely event the Operator’s Workstation or DAS Software fails, data will continue to record and can be recovered from the system post test.

The Operator’s Workstation (6800-PCCOWU-LT) is the primary control and data recording point for the Series 6800 DAS. The PCCOWU-LT is typically a laptop, connected to the USB port and runs PI660 Data Acquisition Software for system setup, calibration, display, recording, distribution and export.






Overview  · Input  · Excitation/Transducer Power  · Amplifier  · Filter  · Digitizer  · Calibration  · Operation  · Data Format  · Data Interface  · Connections  · Mechanical  · Operators Workstation (PCCOWU-LT) (Optional)  · Ordering Information 

Overview

Measurement Type

Bridge
Position

Strain Gage

Analog Bandwidth

1 kHz

Sample Rate (Digitizer)

10 kS/s

Excitation/Transducer Power

+/-12V
+/-15V

Voltage

Filter

4-Pole
6-Pole

8-Pole

Analog Output

None


Input

Configuration

8 channels, 2 to 8 wire with guard shield. Bridge config is programmable for 1/4, 1/2 and full bridge. 350 Ohm completion resistor standard, alternate value may be specified.

Balance

Automatic by program control. Balance accuracy ±0.05% of range, ±1 mV RTO. Stability ±0.02% for 8 hours, ±0.005 %/ºC. Range up to 10 mV/V, 2.5 mV/V (350 Ohm bridge) is provided.

Impedance

50 Megohms, shunted by 500 pF.

Protection

±50 Volts differential, ±50 Volts common mode.


Excitation/Transducer Power

Voltage Excitation

Programmable per channel from 0-12 Volts in 1 Volt ±0.1% steps, or adjustable with 3.3 mV resolution.

Current

50 mA limited to 70 mA.

Regulation

±0.01% for ±10% line and no-load to full-load using remote sensing.

Stability

±0.01%, ±0.005 %/ºC

Voltage Excitation Noise

200 µV peak-to-peak

Monitor

Calibration mode measures excitation voltage with ±0.05% accuracy.

Transducer Power

±12 or ±15 Volts (24 V optional) jumper selectable per channel. Transducer power available on separate pins from voltage excitation. Current is 50 mA per channel, limited to 200 mA maximum per card.


Amplifier

Gain

Programmable from 1 to 5,000 in 1, 2, 3, 5 steps with ±0.05% accuracy.

Gain Stability

±0.01%, ±0.004%/ºC.

Linearity (Amplifier)

±0.01% for gains < 1,000, ±0.02% for gains 1,000 and higher.

Common Mode

80 dB plus gain in dB up to 110 dB, DC to 60 Hz for ±10 Volts.

Zero (Amplifier)

Automatic to ±1 µV RTI, ±0.5 mV RTO.

Zero Stability

±5 µV RTI, ±1 mV RTO, ±1 µV/ºC RTI, ±0.2 mV/ºC RTO. Short term: ±2 µV RTI, ±0.4 mV RTO for 8 hours.

Source Current

±10 nA, ±1 nA/ºC.

Noise (10 Hz)

0.1 µV rms RTI, 0.5 mV rms RTO.

Noise (1 kHz)

1.0 µV rms RTI, 0.5 mV rms RTO

Bandwidth

5 kHz for gains <1,000 and 1 kHz for gains 1,000 and higher.

Slew Rate

3.2 V/µS

Recovery

120 µS to ±0.1% for 10X overload to ±10 V.


Filter

Type

4-freq. 4-pole (standard), 2-freq. 6-pole or 2-freq. 8-pole Butterworth with wideband.

Frequency

4-pole: 4 Hz, 10 Hz, 100 Hz and 1 kHz.
6-pole: 10 Hz and 1 kHz.

8-pole: 10 Hz and 1 kHz.

Noise (Filter)

0.5 mV rms, RTO.

Other

Other filter characteristics and cut offs are available.


Digitizer

Sample

Simultaneous, within ±50 nS channel-to-channel. Droop is less than ±0.005%.

Resolution

16-bits, two's complement.

Sample Rate

Up to 10 kS/s per channel
Up to 10
kS/s

Digitizer Linearity

3 LSB (0.01%)

Continuity

Monotonic to 15 bits.


Calibration

Shunt

Two step Bipolar shunt, 0.5024 mV/V and 0.245 mV/V for 350 Ohm bridge, ±0.1%. For a 120 Ohm bridge, steps are 0.17235 mV/V and 0.08402 mV/V, ±0.1%.

Voltage Substitution

Alternate input for external calibration source. Programmable attenuator with steps of 1, 0.1 and 0.01, ±0.02% accuracy. Output of the attenuator is provided for verification.

Zero Calibration

Amplifier input disconnected and shorted.


Operation

Protocol

Control and data interface is USB 2.0

Software

Window's driver (Both 32 and 64-bit) provides high-level operating command set. Fully compatible with all implementations of PI660 operating software

Control Inputs

TTL inputs for Start, Stop and Trigger assert flags in the header of output data that initiate software control operations

Alarms

Warning and alarm buses may be independent or shared between enclosures and may initiate an output from a digital I/O type module.
Two alarms each with programmable upper and lower limits and persistence checked on each ADC sample.


Data Format

Data Word

16 or 32-bits, 2's complement binary

Scan Table

Maximum format length is 65,536 samples

Sample Rates

Multiple sample rates consisting of the highest sample rate divided by binary numbers. Highest sample rate is programmable with 1 uS resolution


Data Interface

Output Rate

Processor dependent, typically over 5 million 16-bit samples/second

Latency

Processor and scan table dependent, typically less than 5 milliseconds

Clock Stability

100 ppm over temperature range


Connections

Calibration

15-Pin Type D mounted on rear panel. Mating connector supplied.

Control

15-Pin Type D mounted on rear panel. Mating connector supplied.

Synchronization

Sampling clock synchronization for multiple rack systems. RJ45 connector on controller board. Category 5, 2-meter cable supplied.

USB

2-meter cable supplied.


Mechanical

Power Input

10 to 20 VDC. (21 to 32 VDC available on special order)

Operating Temperature (Mechanical)

0 to +50 ºC

Humidity

95% without condensation

Width

View
13.4 in

Height

View
10.5 in

Depth

View
16.7 in

Weight

Approximately 30 pounds with all channel modules

Mounting

Occupies one slot in Series 6000 enclosures.

Connectors

Inputs use two 50-pin Type D connectors. Mating connectors supplied.


Operators Workstation (PCCOWU-LT) (Optional)

Operating System

Windows 7, 64-Bit (others Windows OS configurations available)

Processor & Memory

Intel Core i5 or better. 2 GB RAM

Media

160 GB SSD or better and CD/DVD. Larger disk drives available.

Ethernet

Gigabit Ethernet

Display

15 in

Power

115 or 230 VAC, 47 to 63 Hz.

Operating Temperature

0 to +50 ºC

Size

Laptop (other configurations available)


Ordering Information 

Ordering Information

6840-16 - 16-Ch 12VDC Portable Strain/Bridge/LVDT DAS RJ45
6840-24 - 24-Ch 12VDC Portable Strain/Bridge/LVDT DAS RJ45

6840-32 - 32-Ch 12VDC Portable Strain/Bridge/LVDT DAS RJ45

6840-8 - 8-Ch 12VDC Portable Strain/Bridge/LVDT DAS RJ45

Accessories

6800-PCCOWU-LT - Operator’s Workstation, Laptop


 DOWNLOADS 

Models 6815, 6820 & 6840
(PDF, 570KB)


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