Connect Sensors to Computer via USB Data Acquisition System

i4xx Series Data Acquisition Cards

#iNet-410 Communications card connects an iNET-400 card cage to a Windows computer via an instruNET iNET-240 USB controller	#iNet-420 Provides 20 single-ended (SE)/10 differential (DI) voltage input channels and 4 universal digital I/O	#iNet-423 Provides 6 differential (DI) voltage input channels; each of which has its own amplifier and low pass filter	#iNet-430 Provides 16/8 DI/SE voltage input channels with a 16-bit A/D converter, 4 voltage outputs, and 4 digital I/O	#iNet-460 Provides 12 universal digital I/O (20 mA sink, -10 to 30 V) and 16 digital I/O (200 mA sink, -10 to 30 V)

Connect Directly To Sensors

Thermocouple	Strain Gage	Thermistor	Thermistor
Volts	Current	Resistance	Load Cell

The table below shows which sensors directly connect to each hardware product. The numbers in the table refer to number of channels. The following sensors require an external shunt resistor: RTD, thermistor, resistance measurement, current measurement, ¼ bridge strain gage, and ½ bridge strain gage. Thermocouple sensors require an i510 Wiring Box attached to the i4xx card. In order to do voltage measurement, one needs at least one i430 A/D card. One only needs one i43x a/d card per card cage.

Analog and Digital I/O Cards

instruNet i4xx cards are installed by the end user into an instruNet card cage that is 4, 8, 12 or 16 slots wide. Each card is 13 x 2.5 x 13 cm in size. Below is a list of available cards.

instruNet Software

instruNet includes software to interrogate, test, configure, and do I/O with all network channels. This includes an application program called "instruNet World" and interfaces to Visual Basic, C, and C++. instruNet software can configure all I/O channels, store your settings, view digitized data in real time, stream data to disk, and scroll through your waveform post-acquisition. instruNet software runs on Windows computers.

instruNet World	iW+	DASYLab	LabVIEW
Direct To Excel	C/C++	Visual BASIC	instruNet Scope

i555 Starter System

Why is instruNet Better Than Other Systems?

Low Cost Card Cage
instruNet is a low cost card cage that attaches to Windows computers via USB 2.0. The advantage of a card cage is one can mix and match modules as needed, to build exactly what they need. The advantage of the instruNet card cage is cost. For example, instruNet 4/8/12/16 slot chassis sell for $100 per slot; whereas comparable chassis are 2x to 4x more costly.

Analog Backplane Reduces Cost
The instruNet card cage typically has one A/D measurement module and additional modules provide signal conditioning. The conditioned analog signal is routed to the A/D module via the backplane. This is dramatically different from comparable systems which place A/D measurement electronics on each module. The advantage of the instruNet topology is cost. After the 1st module is installed, additional instruNet channels are conditioned at approximately $40 per channel; whereas comparable systems typically cost 2x to 8x more.

Universal Inputs Reduces Cost
instruNet measurement modules have universal inputs that enable one to directly connect each channel to one of: Thermocouple, Thermistor, Strain Gage, Load Cell, RTD, Voltage, Current, Resistance and Accelerometer. Absolute accuracy for all of these sensor types is specified. In some cases, the end user adds an external shunt resistor. The advantage of universal inputs is cost.

Connect to Computer Via USB

Each instruNet Network is controlled by an instruNet i240 DSP controller card that attaches to a Microsoft 32bit or 64bit Windows = Xp Sp3, Vista, 7 or 8 computer via High Speed USB 2.0 at 480mbit/sec. Each i240 Controller is an independent computer in itself that utilizes a powerful 32-bit DSP processor and onboard RAM to control all aspects of data acquisition along its network. All real-time tasks are off-loaded to this processor, therefore the host computer is not burdened with real-time issues. Each instruNet network supports up to 4 instruNet iNET-400 card cages.

Maximum Sample Rates

The following table shows maximum aggregate sample rates for an i240 USB controller attached to an i4xx Card Cage. To calculate the sample rate for each channel, divide by the number of channels attached to the i240 controller. For example, if the maximum aggregate sample rate is 166Ksamples/sec/controller, and you digitize 4 channels, then you could digitize each channel at 41Ks/sec/channel. One can attach up to eight i240/i60x controllers to a computer to increase total system throughput with ≥ v3.7 software.

i51x Wiring Boxes

#iNet-510	#iNet-511	#iNet-512

i51x wiring boxes easily bolt to i4xx cards. The i510 is the simplest and is included with the i555 starter system. The i511 includes 8 bnc connectors. The i512 has a vRef/2 source that is used to help complete 1/4 bridge and 1/2 bridge strain gage circuits. If you are measuring thermocouples, then the i510 is the only wiring box that will work, since it contains an internal temperature sensor that measures the temperature of the i510 screw terminals.

Low Cost 4/8/12/16 Slot Card Cage

The i400 product provides 4 slots, and multiple i400's can be bolted together by the end user, side-by-side, to create an 8, 12, or 16 slot system. In many applications, one i400 with 4 slots is sufficient.

Specifications

iNET-400
No. of Slots: Each iNET-400 supports up to four cards. Multiple iNET-400's
can be bolted together side-by-side to create an 8, 12, or 16 slot system
Material: Solid aluminum construction
Dimensions: 15 D x 11 W x 14 cm H (6 x 4.5 x 5.6")
Mounting: Place on desktop, affix to DIN rail, 19" rack, or wall mount

ANALOG INPUTS
No. of Channels:
iNET-420: 20 single-ended (SE)/10 differential (DI)
iNET-423: 6 differential (DI)
iNET-430: 16 single-ended (SE)/8 differential (DI)
A/D Converter: 16-bit (iNET-430 only)
Voltage: See voltage accuracy/range charts (on PDF)
Thermocouple: J/K/T/E/R/S/B/N/C/G/D
Thermistor: 2252 Ω (OMEGA 44000 Series)
RTD: 100 Ω , 500 Ω , 1 kΩ platinum
Load Cell: 10 kg, 25 kg, 100 kg, 250 kg, 1000 kg, 5000 kg
Strain: 350 Ω (1/4 bridge, half bridge or full bridge), 1 kΩ (1/4 bridge)
Potentiometer: 10 kΩ , 50 kΩ
Current: ±80 uA, ±120 uA, ±500 uA, ±600 uA, ±800 uA, ±1.2 mA, ±2.5 mA,
±12 mA, ±24 mA, 0 to 24 mA
Resistance: 0 to 33 Ω, 0 to 100 Ω, 0 to 330 Ω, 0 to 1 kΩ, 0 to 3300 Ω, 0 to 10 kΩ
Common Mode Voltage: ±10Vdc (iNET-420 and iNET-430), ±5 Vdc (iNET-423)
Crosstalk: <-80 dB typical
Input Impedance: 100 MΩ

iNET-430 PRECISION ANALOG VOLTAGE OUTPUTS
No. of Channels: 2
Resolution: 14-bit
Range: ±10.1V
Output Current Drive: ±4 mA

iNET-430 ANALOG VOLTAGE OUTPUTS
No. of Channels: 2
Resolution: 8-bit
Range: 0 to 10.1V
Output Current Drive: ±4 mA

DIGITAL I/O (iNET-420/423/430)
No. of Channels: 4 universal digital I/O (20 mA sink, -10 to 30V)
"0" Input Voltage: -10 to 0.65V
"1" Input Voltage: 2.1 to 30 Vdc
"0" Output Voltage: <0.8V @ < 5 mA; < 2V @ <20 mA
"1" Output Voltage: 3.9 to 4.5V
Schmitt Trigger Input: Yes

ENVIRONMENTAL
Operating Environment: 1 to 45°C (34 to 113°F), <90% RH
Storage Temperature: -20 to 70°C (-4 to 158°F)

POWER
Required: +5 Vdc, ±12 Vdc required (supplied by iNET-312-8)
User Available: 3.3 Vdc, 5 Vdc, ±12 Vdc

List Of Products

STARTER SYSTEM

i4xx CARDS

i4xx CARD CAGE

i4xx WIRING ACCESSORIES

ACCESSORIES

SHUNT RESISTORS

Db25 Cables

Contact

Mr. G. Weinreb
GW Instruments, Inc

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