Module spare parts SPIET800

Focus on DCS, PLC, robot control system and large servo system.

Main products: various modules / cards, controllers, touch screens, servo drivers.

Advantages: supply of imported original products, professional production parts,

Fast delivery, accurate delivery time,

The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands

Overview The National Instruments SCXI-1141, SCXI-1142, and SCXI-1143 are 8-channel, programmable lowpass filter modules, ideal for antialiasing applications. You can choose from elliptic, Bessel, or Butterworth filter types. These modules have a common architecture, with a programmable instrumentation amplifier and programmable 8th-order lowpass filter on each channel. While you must set all channels to the same cutoff frequency, you can programatically bypass the lowpass filter on a per-channel basis. By using a combination of analog filters and switched capacitor filters (SCFs), these modules offer the flexibility of 10,000 discrete software programmable cutoff frequencies while maintaining the low-noise performance of traditional, continuous time-active filters. An external clock input and output are also provided so you can set the filter cutoff frequency with an external clock in tracking filter applications. Each module can condition signals ranging from ±50 mV to ±5 V, and offers multiplexed and parallel modes of operation. Analog Inputs These modules share a common architecture. Each channel has its own programmable instrumentation amplifier with differential inputs that you can individually program for signals ranging from ±50 mV to ±5 V. These inputs are protected to ±30 V powered on and ±15 V powered off. In multiplexed mode, these modules multiplex all eight conditioned channels to the rear connector, to which you can connect to a single input channel of the DAQ device. Alternatively, in parallel mode, you can pass each conditioned channel directly to the analog inputs of the DAQ device to increase scanning speeds. This configuration requires a dedicated DAQ device and cable for each module. The NI SCXI-1141/1142/1143 contain 8th-order lowpass filters. See Figures 2, 3, and 4 for stopband and rolloff characteristics for the different filter types. These filters are a hybrid of SCFs and continuoustime filters (CTFs). With SCF technology, the cutoff frequency of the filters is easily configured through software. However, SCFs are sampling systems, and are subject to the same aliasing effects as digitizers. The hybrid design uses a CTF prefilter to prevent aliasing in the SCF and a CTF postfilter to reconstruct the sampled waveform. Lowpass Filters Each module offers different filter response characteristics. The SCXI-1141 has 8th-order elliptic filters, which provide a very sharp rolloff. Elliptic filters are ideal for blocking signals just above the Nyquist frequency. The SCXI-1142 has 8th-order Bessel filters, which maintain signal phase integrity. Bessel filters are ideal for applications requiring simultaneous sampling. Finally, the SCXI-1143 has 8th-order Butterworth filters, which have a flat passband. Butterworth filters are ideal for applications where signal amplitude must be uniform throughout the passband.