PXI-6602(部件号:777557-01,185745-01)计数器/定时器模块由美国国家仪器公司制造，能够完成各种功能，包括:频率测量，编码器位置测量，周期测量，事件计数，脉冲序列和脉冲产生，以及脉冲宽度测量。三个高速DMA传输可以同时完成，而不需要用户计算机的DMA资源。该计数器/定时器模块配备了TTL/ cmos兼容的数字I/O，数字退波滤波器，六条触发线，32位分辨率，静态数据传输和八个上行/下行计数器/定时器。它的测量频率和源频率为80mhz。零件号185745-01是仅用于PXI-6602的板套件版本。

pxi兼容产品，如PXI-6602，可以与CompactPCI设备一起使用。但是，如果要在CompactPCI机箱中使用PXI-6602，则只能访问基本的插件设备功能。将无法获得用于PXI的显式函数。

PXI-6602计数器/定时器模块提供的功能之一是预缩放。此功能允许计数器计数一个信号，比计数器的最高时基快。美国国家仪器PXI-6602计数器/定时器模块上的计数器可以在每个计数器上提供8X或2X预刻度。如果用户选择，也可以停用预缩放功能。每一个预衡器都由一个微小的基本计数器组成，它数到8或2，然后滚动。这个计数器是为这个应用程序创建的，因为它可以计算比常规使用计数器更快的信号。当对正在进行的重复信号进行测量时，预标度意味着与两个计数器周期和频率测量一起使用。

PXI-6602采用NI-DAQmx驱动软件运行，兼容LabVIEW、LabWindows/CVI、Measurement Studio等软件包/ ade。NI器件的物理尺寸为6.3英寸× 3.9英寸。推荐工作温度范围为0°C至55°C，存储温度范围为-20°C至70°C，工作和非工作随机振动分别为0.3克和2.4克，频率范围为5至500hz。

PXI-6602

The PXI-6602 (Part number: 777557-01, 185745-01) Counter/Timer Module manufactured by National Instruments has the capability to complete a wide variety of functions, including: frequency measurements, encoder position measurements, period measurements, event counting, pulse-train and pulse generation, and pulse-width measurements. Three high-speed DMA transfers can be accomplished at the same time, without needing DMA resources from the user’s computer. This Counter/Timer Module comes equipped with TTL/CMOS-compatible digital I/O, digital debouncing filters, six trigger lines, 32 bits resolution, static data transfer, and eight up/down counters/timers. It has a measure and source frequency of 80 MHz. Part number 185745-01 is for the board only kit version of the PXI-6602.

PXI-compatible products, such as the PXI-6602, can be used with CompactPCI devices. However, if the PXI-6602 was to be used in a CompactPCI Chassis, then only elementary plug-in device functions would be accessible. Functions explicitly for the PXI would not be obtainable.

One of the features offered on the PXI-6602 Counter/Timer Module is prescaling. This feature permits the counter to count a signal that is quicker than the counter’s highest timebase. The counters on the National Instruments PXI-6602 Counter/Timer module can provide 8X or 2X prescaling on every counter. The prescaling feature can also be deactivated if the user chooses. Every prescaler is comprised of a tiny, basic counter that counts to eight or two, then rolls over. This counter is created for this application because it can count signals that are quicker than the regular use counters. Prescaling is meant to be utilized with two counter period and frequency measurements when the measurement is performed on an ongoing, repeating signal.

The PXI-6602 is run using the NI-DAQmx driver software which is compatible with software packages/application development environments (ADEs) such as LabVIEW, LabWindows/CVI, or Measurement Studio. The NI device measures 6.3 inches x 3.9 inches in physical dimensions. It has a recommended operating temperature range of 0 °C to 55 °C, a storage temperature range of –20 °C to 70 °C, and an operating and non-operating random vibration of 0.3 grms and 2.4 grms respectively–at a frequency range of 5 to 500 Hz.