Different Types of Isolation: Channel-to-Channel, Bank (Channel-to-Bus), and Channel-to-Earth Ground Isolation
Hardware: Compact FieldPoint, CompactDAQ, CompactRIO, Digital I/O (DIO), Instrument Connectivity Other>>Ethernet, Modular Instruments, Multifunction DAQ (MIO), PXI/CompactPCI, SCC
What is Isolation? I do not understand the differences between channel-to-channel, bank (channel-to-bus), and channel-to-earth ground isolation. What are the differences between the types of electrical isolation NI offers on devices?
Isolation is the means of physically and electrically separating two parts of a device. It protects computer circuitry and human operators, breaks ground loops, and improves common-mode voltage and noise rejection. It can be categorized into electrical and safety isolation. This knowledgebase article discusses electrical isolation. For electrical isolation, parts of a device are separated with isolation barriers that separate the card into sections. Multiple buses service each section individually. The 3 types of isolation can be listed from basic (low level protection) to complete (high level protection) in the order of: Channel to Earth Ground, Bank, and Channel to Channel isolation.
All NI isolated devices are isolated from Earth Ground. They are also either Bank Isolated (with 1 or more banks) or Ch-Ch Isolated.
Figure 2. Schematic of Bank (Channel to Bus) Isolation.
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Report Date: 01/21/2008
Last Updated: 03/20/2013
Document ID: 4HKFIMGP