频率计

The development of an equal precision frequency and phase meter based on FPGA is introduced in this paper, mainly about the design of hardware and software. The Design mainly includes three modules: counting module, calculating module and displaying module. The number of period of a signal is counted by counting module, data from counting module is computed by calculating module, and finally the result from calculating module is showed by displaying module.

本文介绍了基于FPGA的等精度频率与相位计的设计，包括硬件和软件设计，设计主要分为三个模块：计数模块、计算模块和显示模块，计数模块对被测信号周期数进行计数，计算模块对信号处理模块输出的数据进行计算，最后计算结果由显示模块显示。

Factory Taicang with cars, milling, grinding, and other mechanical processing equipment, welding and other processing and cooling capacity, there is electronic measurement device, the transistor characteristics Miriam icon, TB-3 frequency characteristics tester, electronic potentiometer UJ-37 , standard resistance box and other equipment.

太仓仪表厂具有车、铣、磨、等机械加工设备，冷却加工和焊接等生产能力，有电子测量仪、晶体管特性图示仪、TB-3频率特性测试仪、电子电位差计UJ-37，标准电阻箱等设备。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。