【正文】 soidal signal. Aspect of the benchmark signals and principle is consistent, the benchmark phase signals used to produce the data into benchmark phase ROM (figure 2). Benchmark phase ROM and sine ROM difference: the benchmark deposit is in phase ROM, A cycle of sine sampling points but 4 group phase difference of 90 176。 respectively with sinusoidal samples values, , addressing signal output signals to multiplication type D/A signal converter, add to VREF reference voltage. So, produce test signal also produced the same frequency standards phase signal. In the D/A converter, through the benchmark phase signal and the measured signal multiplication, total inductosyn digital. working process and the control system In the design of the logic control can finish is divided into three parts: test signal function, data and logic control parts produced by ISP2128, control logic. The pany ISP2128 LATTICE is programmable logic device, has 128 registers, 6,000 PLD door. When the design principle and VHDL language by mixing method, to achieve the function is divided into several children touch. Each module by VHDL language programming, then use the schematic diagram of the prehensive and designing function. Through a 陜西理工學院畢業(yè)設計第 29 頁 共 47 頁puter operator selection test signal frequency, switch gear. So, the board and the data exchange between the puter is divided into three parts: (1) is used to control the signal from the puter test signals into boards. (2), a measure of ine card by the board into a puter data. (3) is used to transfer data between the puter card, the handshake signal. PCI9054 work process control signals sent for measuring circuit, after receiving signal measurement circuit is measured. Each measure a result, all through the PCI9054 produced in the PCI bus is interrupted. PCI9054 through puter response disruption, reads the measurement results. Until 8 groups test data for puter, a full measure is pleted. The puter data is read by the method, the application for R, L, C, qq, etc.4 system software designMeasuring system hardware design is pleted, still need to prepare the corresponding PCI card drivers and applications. The driver design The driver puter and data card, mand transmitted. When using the DDK DriverStudio design and development of PCI card drivers. According to the first choice set guide, then choose WDM option card for PCI bus types, distribution, and memory object interrupt. As to the specific memory location and interrupt does not need to specify, because the driver shag plug, specific memory location and interrupt by the operating system on your system when Windows starts up. But the memory card in the scope of measurement in [3 configuration register. According to the steps of plete guide set after work, are created driver framework, including: memory object, object, interrupt handling routines, read/write routines, etc. Read/write routines are device driver handle user read request and write the routines, is requests the driver39。s core. Used to respond to user read/write request, the user buffer, and some other control etc. Read/write routines of writing used equipment used in the driver of technology serialization I/O request. applications designWhen the system development Lab Windows choose CVI/development platform, which is mainly based on the standard of pany development method of virtual instrument C language development environment, good user interface [5]. System software modular design, including the user interface design (soft panel), application and driver interface, data processing, read and output and display, etc. System interface (soft panel) is the main ways of manmachine interface, user can better convenience, intuitively operating systems that can be measured by the interface for measuring results in [6]. This system design of the interface as shown in figure 4.In writing software to realize Lab Windows on board, the first to realize the visit Lab Windows and device driver interface, so will the DDK documents Setupapi. J h and file into projects. Data read and processing according to the panel on the part of the button, measuring frequency, ponents and range of different nature calls the function, the selection of input data calculation, and the result of the 陜西理工學院畢業(yè)設計第 30 頁 共 47 頁treatment on display in the instrument panel.Figure 4 virtual panel5 plimentaryThis paper designs the device parameters measurement system, RLC thanks to the PCI9054 interface chip, simplify the PCI bus design, also will signal control and part in all parts of ISP2128 CPLD chip board, save space and improve the quality of the source. Another virtual instrument software system LabWindows use, the signal processing capability is improved, and also for the system provides a convenient. Later upgrade Using these measures of measuring system is developed with a high degree of automation, intelligence, low cost, short development cycle, etc, which can realtime online measurement advantages of RLC device parameters. Using the virtual instrument gradually replace traditional instruments has bee the development trend of the field test, in practical applications, according to the specific circumstances of optimization and the hardware and software programs, the bination of virtual instrument play higher performance. 陜西理工學院畢業(yè)設計第 31 頁 共 47 頁外文翻譯譯文基于虛擬儀器的 RLC 參數(shù)自動測量系統(tǒng)RLC 元件參數(shù)測量儀器是用于測量集中參數(shù)電阻 R、電感 L、互感 M、電容 C 和品質因數(shù) Q 的測量儀器。傳統(tǒng) RLC 參數(shù)測量儀器，如各種交流電橋，在測量電阻、電感、電橋等元件參數(shù)時需要人工換擋調節(jié)，依靠技術人員觀測電橋是否平衡來加以判斷，進而得到待測 R、L、C 等元件的各種參數(shù)，需要反復調節(jié)，且測量精度帶有一定的人為因素，誤差較大。隨著計算機技術的發(fā)展及儀器技術的不斷進步，儀器逐步向智能化、自動化、虛擬化發(fā)展。國外已有 RLC 自動測試儀器產(chǎn)品，但體積很大、價格昂貴[1,2]。本文利用 CPLD 芯片及 PCI 接口芯片設計基于 PCI 總線的 RLC 元件參數(shù)自動測量系統(tǒng)，使用 LabWindows/CVI 作軟件開發(fā)平臺，使系統(tǒng)體積小、價格便宜、升級方便，而且具有良好的人機交互界面。測量電阻、電感、電橋等元件的參數(shù)主要有三種方法：電橋法，諧振法，伏安法。電橋法及諧振法主要是利用偏差測量原理，需要技術人員反復調節(jié)，難以實現(xiàn)自動測量。伏安法測量來源于阻抗的定義，即若已知流經(jīng)被測阻抗的矢量