Computer Upgrade for a Varian CFT-20 FT-NMR Spectrometer forUndergraduate Instruction

化学系正在为目前用于本科生教学的瓦里安CFT-20傅里叶变换核磁共振(NMR)系统购买一台TECMAG MERCY-S12/LOEC计算机升级。该设备用Macintosh 7100/80计算机和专门设计的光谱采集板、接口、DeskWriter 660打印机和Mac核磁共振软件取代了目前的瓦里安620小型机。这款升级到行业标准的32位计算机具有广泛的低成本I/O设备选择，使学生能够在最少的监督下获得一维或二维碳和质子核磁共振谱。目前的仪器是PPG Industries赠送的，拥有可靠的电磁铁和固态仪器控制电路，但存在嵌入式小型机、示波器可视化界面以及笨重的核磁共振谱采集软件的问题，该软件编程困难，包含在盒式磁带和8英寸软盘上。这一升级延长了当前仪器的使用寿命，改进了用户界面，扩大了其在常规和高级光谱采集方面的用途，并为阿巴拉契亚学院协会中拥有类似故障的电磁核磁共振光谱仪的其他学院提供了升级模式。

The chemistry department is purchasing a TECMAG Mercury-S12/LoEC computer upgrade for the Varian CFT-20 Fourier-transform nuclear magnetic resonance (NMR) system currently used for undergraduate instruction. This equipment replaces the current Varian 620 minicomputer with a Macintosh 7100/80 computer and specially designed spectral acquisition boards, interfaces, Deskwriter 660 printer, and MacNMR software. This upgrade to an industry standard 32-bit computer with a wide selection of low-cost I/O devices, enables students to obtain one-dimensional or two-dimensional carbon and proton NMR spectra with a minimum of supervision. The current instrument, a gift from PPG Industries, has reliable electromagnet and solid-state instrument control circuitry but suffers from problems with the embedded minicomputer, oscilloscope visual interface, and cumbersome NMR spectral acquisition software that is difficult to program and is contained on cassettes and 8-inch floppy disks. This upgrade extends the life of the current instrument, improves the user interface, expands its use for both routine and advanced spectral acquisition, and serves as an upgrade model for other colleges in the Appalachian College Association with similar, failing electromagnet NMR spectrometers.