Samsung VP-D310 Specifikace stáhnout pdf (Strana 394)

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15-394 | OWNER’S GUIDE

Avoiding Common Mode Issues

In contrast to isolated ampliers the input common voltage range is limited at differential ampliers. The

measurement conguration below shows the possibilities to measure the current of a 24 V supplied system.

The optimum input range in that case is 500 mV. That will work ne for CH1 in the picture, but not for the

CH0. This channel will exceed the maximum common mode voltage and go into overow.

With the MDAQ-SUB-V-200 module, there are several ranges which overlap between the 12V and 250V

max CMV ranges. This is intentionally done to provide you with more options when it comes to choosing the

best possible t of range/resolution/common mode.

The max. CMV is shown here within the software (analog channel setup dialog):

Notice that in the screen shot above left, the CMV is shown to be 12V max, whereas it is 250V max in the screen shot above

right.

⇒ Always pay attention to the max CMV which is listed on the channel setup screen, when you

select a given range within the software.

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