Server: Microsoft-IIS/3.0 Date: Fri, 21 Nov 1997 04:31:45 GMT Content-Type: text/html Accept-Ranges: bytes Last-Modified: Sat, 15 Mar 1997 01:43:46 GMT Content-Length: 14268 The PC7000

 

PC7000™

Large Channel Count Data Acquisition on the Windows™ NT™ Platform


Designed to run in the Windows NT environment, the PC 7000 is a complete data acquisition system consisting of a PC Host (any PC with built in ethernet), Input Modules in groups of 8 or 16 channels, and one Digital Signal Processor (DSP) per set of input channels. Add the optional Output Module, Tachometer Input, and Data Throughput disk; and you have one of the most powerful up-to-date data acquisition systems available for the PC today.

PC7000 Data Acquisition Front End

This is where all analog data is captured, filtered, converted to digital data, and processed, before being sent to the host for display. Because most data reduction, such as overlap processing, cross properties, and averaging, is performed in the front-end, communication with the host PC is faster and displays require less dedicated host time.

Ethernet Communication With Front End

Does your PC serve multiple purposes? Thinwire Ethernet (IEEE 802.3) in stand-alone or clustered networks provides the convenience of remote processing. Each PC 7000 has its own Ethernet address allowing you to perform remote data acquisition and post-processing and still have networking capabilities with other PC's and peripherals such as printers.

PC7000 Input Modules

Built into the PC 7000 Multi-Channel FFT Analyzer are either 16-channel Input Modules with 5 kHz capabilities or 8-channel Input Modules with 20 kHz capabilities. Each PC 7000 Chassis holds a maximum of 3 modules and multiple PC 7000 Chassis can be slaved together to provide systems of up to 512 channels or more.

The PC 7000 Multi-channel FFT Analyzer fits nicely on a desktop next to your PC or is transportable to a remote location and accessible via Ethernet connections. The PC 7000 can also be operated by HP UNIX based workstations in networks where workstations are available by downloading the appropriate UNIX based analyzer software.

The PC 7000 input modules provide precise signal conditioning which allow you to optimize the dynamic measurement range for any given test. Voltage ranges of .010 to 20.0 V with .375 dB step sizes are available as 176 discrete voltage range settings. You realize over 13,000 discrete frequency ranges between 1.4 Hz and their respective upper frequencies. You improve the quality of each measurement.

PC7000 DSP (Digital Signal Processor)

All Auto and Cross Power spectral averaging is supported, in addition to FFT (Fast Fourier Transform), IFFT (Inverse Fourier Transform), octave calculations with A, B, C, or no weighting. Calculations for 1/3 octave, single or double integrate, and single or double differentiate are also performed in the DSP. Because there is one DSP per PC 7000 chassis; as additional chassis are added to a system, the real-time rate and Throughput performance are not degradated. Auto and Cross Power spectrums required for MIMO FRF calculations are performed by the DSP as a standard capability. The resultant data can be saved as binary or ASCII and transferred to your favorite Modal package.

PC7000 Throughput Disk Option

Throughput operations can be performed simultaneously with display and DSP Processing. Because there is one Throughput disk per DSP, aggregate rates are the highest available. Both fixed hard disks and removable optical disks are available for data recording. Removable optical disks allow for easy data archiving of raw time data. With the throughput option you collect data once and play it back many times. Recorded data is raw digitized time data. So you can play it back using different averaging methods, weighting windows, and functions. Want more flexibility? Try playing it back using overlap processing or a different blocksize. Don't want to playback all the data every time? Start and stop at the records of your choice.

PC7000 Signal Generator Option

The Signal Generator uses a 12 Bit Signal DAC (Digital to Analog Converter) to create the signal, followed by a 12 bit Gain DAC to apply amplitude scaling. The Amplitude range is 10 mV to 10 V. The frequency range is from DC to 20 kHz. If you have more than one output generator, they may be set independently. For those times when you need one or more output signals to excite a structure, whether it is Pseudo-Random, Broadband Random, Burst Random, Swept Sine, or any other excitation technique, the Signal Generator option of the PC 7000 can easily produce the signal required. The frequency and amplitude, as well as the phase of the sine function can be accurately controlled for each output channel, which is essential for any sine testing. Sweeping in both linear and logarithmic modes is also supported. Burst Random, which is a very efficient way of exciting a structure using single or multi-point random signals, is supported in a user-friendly manner. The burstŐs on and off times can be controlled easily to allow high quality of test data to be acquired.

PC7000 Data Acquisition And Analysis Software

The PC 7000 Software Suite combines our 25 years of software experience and "know-how" with the intimate knowledge of the front-end hardware. This gives the PC 7000 real-time capabilities that are unsurpassed in the industry. From fast parallel processing and data throughput recording, to a wide variety of real-time displays and processing capabilities, the PC 7000 with its Software Suite provides the tools to measure and analyze your noise and vibration problems so that you can concentrate on solutions.

PC7000 Real Time Displays

The PC7000 can display up to 16 separate display windows with up to 8 overlay displays in each. Screen update rates are dependent on the type of PC processor (486 or Pentium). Regardless of the data path, throughput disk, spectral average memory or number of displays requested, data can be displayed in a variety of formats without degradation to the acquisition speed. And, each display window may be moved, expanded; plots may be re-sized, expanded; and two-dimensional cursors activated during acquisition; again, without degradation of acquisition speed. Choose from over 30 functions. Plot in XY, Complex, Tracked, Waterfall, or Campbell Diagram. Use textures, colors, and symbols to represent your data.

PC7000 Processing Operations

Use arithmetic blocks for "What if?" scenarios. Create, modify, or delete data from all or part of an arithmetic block. Combine pieces of data from different blocks to form a new block. Apply an arithmetic function to part or all of the data. Run that data against your scenario. Compare the scenarios by overlaying the different results into one plot display.

PC7000 Transfer Of Data Files

Write function files from time, frequency, or ordered data. Read these files into the PC 7000 software for comparison with newly acquired data. Write Universal file (type 58, Function at Nodal DOF, ASCII format) from time, frequency, order, or tracked data. Create ASCII text files by redirecting the software output listings or the data calculated in batch routines. Move ASCII files to other software products, i.e. speed sheets or word processors for further analysis and report generation.

Rotating Machinery Analysis With The PC7000

When your primary concern is the behavior of rotating machinery, the PC 7000 offers more than one method for obtaining the necessary data. Each method optimizes the spectrum of periodic data and for studying how spectral components vary with machine speed. The PC 7000's Rotating Machinery Software Suite provides the tools you need to acquire frequency, order, or acoustic domain data in real-time.

The PC 7000 hardware tach circuitry of the DSP is used to measure an RPM value for each block of data acquired. This data can then be used to synthesize order spectra data by translating the frequency axis into an order axis.

RPM Synthesis allows estimation of the RPM averaged over each block of internally sampled data, based on a selected data channel. This method is most suitable at slower speed changes.

Frequency Synthesis allows frequency domain functions to be displayed in real-time using an order domain synthesis calculation. This option is selected with a single button in the Function View menu.

Order Synthesis, from asynchronously (baseband) sampled data, allows order domain functions to be displayed in real-time using a frequency domain synthesis calculation. This option is selected with a single button in the Function View menu.

The order tracking table is an efficient way to setup a table of all orders to be tracked for any or all of the channels during acquisition. Orders of interest are measured and accumulated on the DSP, instead of on the host. This capability improves RPM resolution and allows much higher tracking speeds.

All speed domain functions may be plotted as a function of RPM, time, vehicle speed (in MPH or km/hr with user specified wheel diameter and transmission ratio), frequency in Hz, a specified non-integer multiple of RPM, or a user defined block of numbers.

Modal Analysis With The PC7000

Concerned about the dynamic behavior of a structure? Airplanes, automobiles, ships, buildings, bridges, and dams - all are influenced by the critical response of the structure. All modal testing begins by first acquiring the frequency response functions of a structure while it is excited by one or more external forces. With both SIMO and MIMO capabilities, the multi-channel PC 7000 FFT front-end can easily capture accurate measurements and process the data to fit any of your Modal Analysis needs.

In addition to excitation techniques such as Impact, Pseudo-Random, Broadband Random, Burst Random, and Swept Sine, the PC 7000 calculates and displays time, auto and cross spectrum, coherence, FRF and many other functions. With its real-time, multi-trace display capability, the PC 7000 monitors measurements in a variety of formats, such as Bode, Real & Imaginary, Nyquist, and Waterfall, to ensure that data of the highest quality is acquired.

Save the data to a binary or Universal File Format for transfer to STAR Modal Analysis™, to I-DEAS Modal Analysis™ or to your favorite Modal Analysis package.

Acoustic Analysis With The PC7000

When noise and vibration are inseparable, take advantage of Acoustic Analysis to solve airborne or water borne noise problems. The PC 7000 provides the measurement data you need from narrowband and real-time octave acquisition to perform post-processing with your favorite Acoustic Analysis package.

From FFT processing, to calculating FRFs, Cross Correlation's, Cross Spectral Density functions, 1/3 octave bands, to finding the harmonics you need; the PC 7000 is fast, flexible, and reliable.

The next time you need data for Acoustic Intensity Analysis, start your project with the PC 7000, save your test data to a binary or Universal File Format, and finish with STAR Acoustic Intensity Analysis™, I-DEAS Acoustic Intensity Measurements™, or your favorite Acoustic Analysis package.

Find out how the PC 7000 FFT Analyzer can help you improve product quality and enhance productivity by contacting us at:

 

Zonic Corporation
50 West TechneCenter Drive
Milford, OH 45150
(513) 248-1911
Fax: (513) 248-1589
E-mail: mail_desk@zonic.com

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