INet-423 InstruNet Amplifier Card With Low Pass Filter, 6 AI, 4 DIO

Analog Input
Description

6di Voltage Input Channels

This Amplifier (not A/D) module provides 6 differential voltage input channels (Ch#1/2...#11/12), each of which are independently software programmable with Windows software that support the direct connection to many common sensor types

Absolute Accuracy

Specified

Error components (i.e. INL, DNL, linearity, noise, temperature drift , time stability) are summed and specified as "Absolute Accuracy" with the following supported sensors (click for accuracy and maximum sample rate): Voltage, Thermocouple, Thermistor, RTD, Load Cell, Strain Gauge, Potentiometer, Current, Resistance, Accelerometer

Voltage Ranges

±5mV ... ±5V, 0 to 40mV ... 0 to 5V

Voltage input range on each channel is independently software programmable to one of: ±5mV, ±10mV, ±20mV, ±40mV, ±80mV, ±300mV, ±600mV, ±1.2V, ±2.5V, ±5V, 0 to 40mV, 0 to 80mV, 0 to 2.5V, 0 to 5V

Internal A/D

(none)

This module does not contain an A/D converter, and therefore internally routes measured voltage to an i43x A/D module anywhere in card cage. At least one i43x must be installed in order to measure a voltage with this module.

Sensors

Direct Connect

Each of the 6 differential channels support the direct connection to the following sensor types: Voltage, Thermocouple, Thermistor, RTD, Load Cell, Strain Gage, Potentiometer, Current, Resistance, Accelerometer

Channel Amplifiers

Software Programmable

Each channel provides the following software programmable parameters: A/D Signal-Averaging-Per-Point (0 ... 100mSec) , Sample-Rate (samples-per-second-per-channel) , Analog Low Pass Filter (0.006KHz / 2poles, 4KHz / 2poles, or FullBandwidth) , Digital IIR Filter (LowPass, HighPass, BandPass, or BandStop), Voltage Measurement Range (±5mV...±5V) , and Sensor Type

Wiring

Differential Only

Single-ended (SE) wiring involves measuring the voltage between the input pin and instruNet Ground; whereas Differential (DI) wiring involves measuring the voltage between two input pins

Protected Voltage

-18 to +18V

Short any combination of voltage input channels to external -18 to +18V power source (i.e. capable of high current), instruNet power on or off, any duration, without damage

Analog Low Pass Filter

0.006KHz / 2poles, 4KHz / 2poles, or Full Bandwidth

Each channel provides several independent analog low pass filter options. "FullBandwidth" refers to no filter, which involves running the channel at it's full bandwidth as notes in the Voltage Accuracy table

RFI Filter

124 KHz RFI filter

RFI filter is a low pass filter that rejects high frequencies that could cause small measurement errors if left unfiltered

Digital Filter

LowPass, HighPass, BandPass, or BandStop

Each channel provides optional digital IIR lowpass, highpass, bandpass and bandstop filters with independent software programmable cut-off frequency, minimum dB stopband attenuation, maximum dB passband attenuation, and filter type (e.g. Elliptic, Chebyshev B, Chebyshev S, and Butterworth). Number of poles is programmable between 2 and 32 for bandpass/bandstop; and between 2 and 16 for lowpass/highpass .

Maximum Sample Rate

166Ks/sec/aggregate

Digitize at a maximum sample rate of 166K sample/sec for 1 channel on largest voltage input range. More channels at same voltage input range involves slower rates, e.g. 83Ks/sec per channel for 2 channels, 41Ks/sec/ch for 4 channels, and 20Ks/sec/ch for 8 channels. For a details on maximum sample rate and bandwidth with different voltage input ranges, sensor types, and a/d averaging ; please request the absolute accuracy specification tables. Things that decrease High Speed I/O sample rate: longer computer to instruNet cable, i330 optical-isolator. Sample rate is set accurate to 50 ppm (e.g. user specifies 20000 s/sec yet system actually digitizes at 20001 s/sec). Minimum sample rate is 0.015 samples/sec/ch.

Sensor Excitation

Included

Excitation power (+3.3V ±.2V, <0.22A, 37mA per sensor max) is provided for sensors, along with other End User Power voltages. This 3.3V, which is referenced to instruNet Ground, is automatically readback by A/D when calculating sensor values.

Common Mode Voltage

-5 to +5V

All voltage input pins must be driven with a voltage between -5 and +5V, with respect to instruNet ground. instruNet ground is connected to instruNet chassis, which is connected to Earth ground via instruNet power supply plug.

Input Coupling

DC

Measure constant DC voltage or dynamic AC waveform with absolute voltage accuracy

Input Impedance

100M Ohm

Internal 100M Ohm resistor (5% accuracy) between input pin and instruNet ground reduces fluctuating measurments when input pin is left unconnected

Common Mode Rejection Ratio

>= 110dB on <= ±80mV range
>= 80dB on > ±80mV range

CMRR is the amount of rejection of a common signal that is present on both inputs of a differential measurement. Theoretically, it should not be measured because the differential measurement looks at the voltage between two pins; however small internal imbalances cause a small error, which is specified here with a DC to 60Hz common mode signal.

Digital I/O

Description

4 Bidirectional Digital I/O

The 20mA sink digital I/O port consists of 4 individual TTL-compatible lines (Ch#25...#28), each of which can be configured as: digital input bit, digital output bit, control output, clock output. When configured as an input, a channel can be used to sense a digital high (2.1 to 30 Volts) or digital low (-10V to .65Volts). When configured as an output, a channel can be set high (e.g. >2V) or low (e.g. <0.8V). These I/O pins are short-circuit protected against high voltages up to 32.0V and down to -16.0V.

Function

Multiple Options

Software programmed to one of: digital input bit, digital output bit, control output, clock output. Clock output options are: 24MHz, 12MHz , 6MHz, 1.5MHz, 1MHz, 375KHz, 100KHz, 93.750008KHz, 23.437502KHz, 10KHz, 5.9KHz, 1.5KHz, 1KHz, 366Hz, 100Hz, 91.552734Hz, 22.888184Hz, 10Hz, 5.7Hz, 1.4Hz, 1Hz, 0.358Hz, 0.0894Hz. Control output options are: pulse low when rd/wr to Uio 25..28 port, pulse low when read from Uio 25..28 port, pulse low when in software reset or power is off.

TTL Compatible

Yes

Supports 0.8V for logic 0 and 2V for logic 1, which is typical for TTL

3.3V Cmos Compatible

Yes

Supports 1.1V (3.3V*.35) for logic 0 and 2.3V (3.3V*.7) for logic 1, which is typical for digital Cmos powered by 3.3V

5V Cmos Compatible

Yes

Supports 1.75V (5V*.35) for logic 0 and 3.5V (5V*.7) for logic 1, which is typical for digital Cmos powered by 5V

Drive Relay Directly

Yes

Wire one side of external relay coil to power supply (e.g. 5V, 12V), wire other side to I/O pin, and output logic 0 to turn on relay

Detect Switch Closure

Yes

Wire one side of external switch to gnd, wire other side to I/O pin, input logic 0 when switch is closed, and input logic 1 when switch is open

General

I/O Connector

HD44 male

High density 44 pin male connector

Wiring Box

Compatible

Easy to install wiring box: i510

Physical Dimensions

134.6mm x 130.3mm x 25.4mm
(5.3" x 5.13" x 1")

Standard instruNet i4xx card,

Operating Temp.

1 to 45°C

Operate in temperature between 1°C and 45°C, no condensation

Storage Temperature

-20 to 70°C

Store in ambient temperature between -20°C and +70°C

Relative Humidity

<= 90%

Operate in humidity less than 90%, no condensation

Hot Plug & Play

Yes

One can insert i4xx module with power on or off, without damage