为什么SH-100-100 线缆中的管脚1和管脚2是短接在一起的?
硬件: Counter/Timers (TIO)>>Devices>>PXI-6624
问题: 我正在试着使用SH100-100线缆连接我的设备,但是管脚1和管脚2之间是短接的,在一些设备上我无法使用个别数字管脚或者是NI 6624的计数器,这是为什么呢?
解答: SH-100-100和 SH-100-100F的区别就在于管脚1和管脚2是否短接。 SH-100-100线缆将管脚1和管脚2短接是为了降低噪声干扰,该电缆设计初衷用于模拟信号,并且有1m、2m、5m和10m长度的规格
SH-100-100F的管脚1和管脚2之间没有短接,该电缆主要用于数字信号和定时信号,而且,SH-100-100F仅有2m长度的规格,因为如果长度过长会因缺少屏蔽对数字信号产生衰减,造成电平高低判断失误。
使用 SH-100-100F会导致PXI-6624无法使用计数器0与source端有关的应用。这是因为6624 计数器0的source分别有两个输入端CTR0 SRC+ 和SRC-
受影响的设备有:
NI 6509
NI 6511
NI 6512
NI 6513
NI 6514
NI 6515
NI 6527
NI 6528
NI 6624
PC-DIO-96
相关链接: KnowledgeBase: Wire Mapping List for the SH100100 Cable
Products and Services: NI SH100100
Product Manuals: DAQ Accessories Selection Guide
Products & Services: NI PCI-6624 Product Page
Knowledge Base 35RHIHIO: Why Do I See An Incorrect Output on My PCI-6624?
KnowledgeBase SH100100F Cable Specifications: SH100100F Cable Specifications
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附件:
报告日期: 01/10/2008
最近更新: 07/27/2015
文档编号: 4H9CS9QR
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