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INet-500 InstruNet Anti-Aliasing Low Pass Filter

iNet-500 InstruNet Anti-Aliasing Low Pass Filter
£18000

(£216.00 incl VAT)
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Model:iNet-500

Description

The instruNet i4xx card cage is available with 4, 8, 12 or 16 slots. The first slot is used to house the i41x interface card and the 2nd slot is used for the i43x a/d measurement card. The remaining slots can be populated with i423 cards. The i423 provides 6 signal conditioning amplifiers, one for each channel. These can measure voltages, and can also attach directly to common sensors such as thermocouples and strain gauges. Each channel on the i423 includes a socket that attaches to a tiny optional 4 x 2 cm daughterboard. This is held in place with one bolt and is installed by the end user.

There are four different i500 filter daughters to choose from, each with a different cutoff frequency (380Hz, 1kHz, 3.3kHz, 10kHz -
Please specify required type on any order).

Yet optional further digital low pass filtering provides lower cutoff frequencies. For example, one can digitize at 100s/sec/channel with the Fc=1KHz i500 analog filter and digitally filter at Fc=38.5Hz to get anti-aliased 100s/sec/ch data. Internally the system would digitize at ≥ 6Ks/sec/ch and do digital processing to calculate very accurate 100s/sec/ch data. This digital processing is done in the background and the end user only needs to set one software parameter called "
Auto Afs" to enable it.

Features

  • 8-Pole analog low pass butterworth filter daughterboard, ideal for anti-aliasing
  • End user installs between 1 and 6 filter daughterboards onto each i423 card, one daughterboard per channel
  • Maximum of 35 filtered channels per system
  • Sold in packages of two filters per product, each is 1.7 x 0.6 inches (4 x 2 cm)
  • i500 analog filter provides extremely low ±0.01dB maximum passband ripple for Fin/Fc ≤ 0.5. If one uses further oversampling, digital filtering and desampling; then passband ripple is ±0.002dB for Fin/Fc ≤ 0.8 due to the accuracy of a 30-pole digital filter.
  • i500 analog filter provides stopband attenuation of ≥ 76dB for Fin/Fc ≥ 3
  • Signal first passes through i423 signal conditioning amplifier before reaching i500 analog filter; therefore, one can attach directly to the following sensors:Voltage,  Thermocouple,  ThermistorRTD,  Load Cell,  Strain Gauge,  CurrentResistance,  Accelerometer
  • 4 different filter products, each with different cut off frequencies: 380Hz, 1KHz, 3.3KHz, 10KHz. However, further digital processing provides other cutoff frequencies lower than these. For example, with an i500 Fc=1KHz analog filter one can digitize at ANY sample rate less than 2Ks/sec/channel and have a DIGITAL low pass filter provide anti-aliasing.

Specifications

Specification i500 ANALOG Filter DIGITAL Filter
Type 8-Pole Butterworth ≥ 30-Pole IIR Butterworth
Cut-off Freq. 380, 1K, 3.3K, or 10KHz 0.01 Hz to 10KHz
Fc Freq Accuracy ±2% ±0.01%
Fc Freq Stability ±0.01%/°C n/a
Stopband Attn see table see table
Passband Ripple see table see table
Max Noise -90 dB -120 dB
Passes DC yes yes
DC Voltage Gain ±0.02% (±0.002 dB) ±0.02% (±0.002 dB)
Power Consumed 8mA @ -12V, 8mA @ +12V n/a
Design Op Amp (not switched IC) Digital
Size 1.7x0.6 inches (4.3x1.6cm) n/a

 

Description

The instruNet i4xx card cage is available with 4, 8, 12 or 16 slots. The first slot is used to house the i41x interface card and the 2nd slot is used for the i43x a/d measurement card. The remaining slots can be populated with i423 cards. The i423 provides 6 signal conditioning amplifiers, one for each channel. These can measure voltages, and can also attach directly to common sensors such as thermocouples and strain gauges. Each channel on the i423 includes a socket that attaches to a tiny optional 4 x 2 cm daughterboard. This is held in place with one bolt and is installed by the end user.

There are four different i500 filter daughters to choose from, each with a different cutoff frequency (380Hz, 1kHz, 3.3kHz, 10kHz -
Please specify required type on any order).

Yet optional further digital low pass filtering provides lower cutoff frequencies. For example, one can digitize at 100s/sec/channel with the Fc=1KHz i500 analog filter and digitally filter at Fc=38.5Hz to get anti-aliased 100s/sec/ch data. Internally the system would digitize at ≥ 6Ks/sec/ch and do digital processing to calculate very accurate 100s/sec/ch data. This digital processing is done in the background and the end user only needs to set one software parameter called "
Auto Afs" to enable it.

Features

Specifications

Specification i500 ANALOG Filter DIGITAL Filter
Type 8-Pole Butterworth ≥ 30-Pole IIR Butterworth
Cut-off Freq. 380, 1K, 3.3K, or 10KHz 0.01 Hz to 10KHz
Fc Freq Accuracy ±2% ±0.01%
Fc Freq Stability ±0.01%/°C n/a
Stopband Attn see table see table
Passband Ripple see table see table
Max Noise -90 dB -120 dB
Passes DC yes yes
DC Voltage Gain ±0.02% (±0.002 dB) ±0.02% (±0.002 dB)
Power Consumed 8mA @ -12V, 8mA @ +12V n/a
Design Op Amp (not switched IC) Digital
Size 1.7x0.6 inches (4.3x1.6cm) n/a

 

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