Data Acquisition Card.

The commercial test equipments from Pulse Instruments, Lumitron and Electro Optical Industries Inc. are very expensive. It uses complex programmable logic device to generate the necessary pulse for the UFPA and the low noise low dropout micropower regulator to obtain the low noise bias. A proportional-integral-differential controlled thermal electrical cooler based on micro-processor unit stabilizes the UFPA. The National Instruments 6111E Data Acquisition Card is used to convert the analog output of UFPA into digital signal into computer. Its 12-bits conversion capability provides sufficient accuracy for evaluating the S/N ratio and non-uniformity of 128 x 128 pixels UFPA. Labview is used to analyze the signal. The instrument is fast and convenient to adapt the system to other types of UFPA. Further discussion is presented to determine factors that affect the accuracy of the tester.

The simplest answer is that it is a basic A/D converter coupled with an interface that allows a personal computer to control the actions of the A/D, as well as to capture the digital output information from a conversion. A data acquisition card plugs directly into a personal computer's bus. All the power required for the A/D converter and associated interface components on the data acquisition card is obtained directly from the PC bus.

A PCMCIA data acquisition card converts analog signals into a digital output form, which can be manipulated with software. Using software in conjunction with a personal computer, analog data can be displayed, logged, charted, graphed, or stored in memory as needed.

A data acquisition card designed for high-performance will work in a very wide range of test and measurement and control applications. A data acquisition card, combined with robust software will turn a personal computer into powerful measurement system that may be used to automate experiments, construct product test stands, monitor and control production equipment, or be embedded in products ranging from medical monitoring systems to automobile test simulators.

Based on matching, meeting or exceeding the set limits, a digital control signal from a PCMCIA data acquisition card (in the form of a single-bit output signal) can be used to turn on or turn off a relay. This, in turn, can be used to turn on various control elements like, fans, pumps, motors, etc.

Figure 1: Schematic setup. The Pentium-133 computer is connected to a LAN via Ethernet, through which telescope control will occur. The GPIB card is connected to an HP8648C synthesizer for calibration and the PIO-12 data acquisition card is connected to WASP.

Measurement Computing Corporation offers the largest selection of PC-based data acquisition and measurement products. From PCI, USB, PC/104, ISA, and PCMCIA bus boards to external systems based on USB, RS-232, RS-422, RS-485, and GPIB interfaces; Measurement Computing has everything you need for your PC-based data acquisition and control applications.

Taking advantage of the VME bus, the PI-4005 Acquisition System can acquire analog data at rates up to 40 MHz with 10 bit resolution or with up to 16 bit resolution at 2 MHz. Digital acquisition cards are also available.

The Acquisition Station can be used for all kinds of repetitive data acquisition tasks. This paper gives an overview of the system performances when used for advanced ultrasonic tube inspections.

Separate power supplies and Separate ground systems are used for the Analog and Digital circuitry, with only the required ground connection underneath the A/D converter as the common point. This common point on the digital side of the card is supported by a separate 5V power supply. This is part of the PI-4008 analog power mainframe, and separates the A/D converter from the power supplies that are on the bus.

A controller is linked to real-time hardware simulation system in this step. The data can be exchanged between the simulation system and the controller through hardware signals. Both the soft- and hardware for the controller can be validated thoroughly during this period. And at the same time large amount of inner data in controller side can be transferred outside through the dual-port RAM in microcontroller emulating system and be demonstrated in real time in PC computer.

Turning off the swap can sometimes be an effective way to avoid paging in the system and avoid dreaded latencies. Of course this does not solve task switching delays.

A 100kHz data acquisition card is added in parallel to the current load-displacement data acquisition system to allow rapid data acquisition of electrical measurements with high time-resolution correlation of the load displacement and current-voltage measurements. This additional data acquisition card allows input and time based correlation to the load-displacement data of any analog signal from parallel measurements. The analysis software allows math operations on the analog signals to convert the input signals to meaningful quantities. In addition, the digital channels on the data acquisition card can be utilized to trigger other hardware or parallel measurements during the simultaneous electrical and mechanical measurements.

"To control the deposition process accurately," says Barlett, "system demands mandated that the kilovolt-power supply is accurately controlled." But because power supplies for such guns cannot be readily purchased, kSA engineers developed a custom unit for the purpose. To accurately control this power supply, an eight-channel, 16-bit DT334 digital-to-analog (D/A) converter board from Data Translation was integrated into the PCI card cage of the host computer. This data-acquisition card is controlled from the operator interface, also developed using Microsoft Visual C++.

A Pentium would be nice, but it really doesn't matter for the data logger. The data acquisition card is a PcLabCard PC-711s which happens to be supported by the EMON program which is available for free off the web. This is plenty good to see earthquake signals. Lots of guys have done it with only 8 bit resolution.

Connected to the standard PCI bus which is available on standard PC's the signal is digitized, temporarily stored, pre-processed and transferred to the bus. Design is in a way that the limitations set by the system are better than the physical limitations set by the ultrasound response. In many applications the system is faster as the ultrasound asks.

The present invention is a portable, self-contained data collection system for measuring and collecting vibration data from machines. The system includes an accelerometer including a motion sensitive transducer and an accelerometer output. The accelerometer is coupled to a machine to produce an analog signal at the accelerometer output. The system also includes a data acquisition card having an analog input and a digital output. The accelerometer output is electrically coupled to the analog input. As used herein, electrical coupling includes wireless, optical or conventional wire coupling. The system also includes a battery-powered portable computer such as a pen-based computer, which includes an expansion slot. The data acquisition card digital output is electrically and mechanically connected to the expansion slot.

The battery-powered portable computer also includes a database having machine identifications and associated measurement parameters. User input means such as a pen allows user selection of a machine identification for measurement. The portable computer also includes signal processing means for processing the time domain digital signal according to the measurement parameters associated with the selected machine identification. Finally, the battery-powered portable computer also preferably includes signal analyzing means for analyzing the frequency domain digital signal to produce predictive maintenance information such as spectral distribution. The time domain digital signal can also be analyzed to produce crest factor and other predictive maintenance information.

A data collection system according to the present invention uses a standard portable computer such as a pen-based computer and a standard data acquisition card such as a PCMCIA sound card, to provide portable self-contained hardware for data collection and analysis. The machine database, signal processing means and signal analyzing means are preferably implemented using software modules which execute on the portable computer. The machine database and the signal analyzing software may be provided using EMONITOR for Windows or other predictive maintenance software on the portable computer. Signal processing software may be provided by conventional digital signal processing software which provides digital filtering, integration from acceleration to velocity or displacement units, Fast Fourier Transform or other mathematical functions, and averaging. Accordingly, a low cost self-contained data collection system is provided.

During operation, the kSA-400 system offers a variety of image-acquisition control settings, including CCD exposure time, image digitizer A/D conversion settings, frame adding, background subtraction, image filtering, and false coloring. Due to the multiple threading capabilities of the system, these various options can be applied on-the-fly, resulting in immediate visualization of the applied settings.