KNOWLEDGEBASE
Item #: 906 |
Created: 4/1/2013
Categories: Data Acquisition - MX100/MW100, Data Acquisition - SL1000, Data Acquisition - WE7000, Oscilloscope - DL1700/1600/1500, Oscilloscope - DL6000/DLM6000, Oscilloscope - DL7400, Oscilloscope - DL9000/SB5000, Oscilloscope - DLM2000, Power Meter - WT1600, Power Meter - WT1800, Power Meter - WT3000, Power Meter - WT500, ScopeCorder, Source Measure - GS820/GS610/GS200
Why do I Need to use a Hub When Communicating With the Instrument via Ethernet?
Solution:
The AC Power Input in all Yokogawa instruments is designed as a 3-pin connection (one of which is a GND pin). In some parts of the world, PCs are sold with AC power cables that are 2-pin. Often times this means the PC does not have a proper connection to GND. In this case, if the PC was connected to the instrument via a cross-over cable only, the PC would not be able to get a good ground reference level. This is because the GND line/pin on an Ethernet cable to too thin and he connection would be prone to noise and disruptions in communication/data transfer with our instruments.
To avoid the noise and communication disruptions, it is our recommendation to the customer to use a HUB when communicating to the instrument via Ethernet. The HUB will provide a very strong GND connection and eliminate most of the noise problems. HUBs are designed to provide a reliable and high quality communication/data transfer connection over an Ethernet at high speeds.
In the US, most AC adaptors for PC and PC power connections are 3-pin, and have a GND connection. If the PC and the instrument are both well grounded, then there is no problem in using a cross-over cable to connect directly to our instrument. Since we don't know if there is a good GND connection in the customer's PC, we generally recommend using a HUB when connecting to the instrument via Ethernet.
To avoid the noise and communication disruptions, it is our recommendation to the customer to use a HUB when communicating to the instrument via Ethernet. The HUB will provide a very strong GND connection and eliminate most of the noise problems. HUBs are designed to provide a reliable and high quality communication/data transfer connection over an Ethernet at high speeds.
In the US, most AC adaptors for PC and PC power connections are 3-pin, and have a GND connection. If the PC and the instrument are both well grounded, then there is no problem in using a cross-over cable to connect directly to our instrument. Since we don't know if there is a good GND connection in the customer's PC, we generally recommend using a HUB when connecting to the instrument via Ethernet.
