Manual Fluke MDA-550-III (page 80 of 98) (English)

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190 Series III

Users Manual

Independently Floating Isolated Inputs

The test tool has independently floating isolated inputs. You can use the independently floating

isolated inputs to measure signals that are independently floating from each other. Independently

floating isolated inputs offer additional safety and measurement capabilities compared to inputs

with common references or grounds.

Each input section (A, B, C, D, A, B, METER INPUT) has its own signal input and its own

reference input. The reference input of each input section is electrically isolated from the

reference inputs of the other input sections. The isolated input architecture makes the test tool

about as versatile as having four independent instruments. The advantages of having

independently floating isolated inputs are:

• Simultaneous measurement of independently floating signals.

• Additional safety:

◦Since the commons are not directly connected, the chance of causing short circuit when

measuring multiple signals is greatly reduced.

◦When measuring in systems with multiple grounds, the ground currents induced are kept

to a minimum.

Because the references are not connected together inside the test tool, each reference of the

used inputs must be connected to a reference voltage. Independently floating isolated inputs are

still coupled by parasitic capacitance. This can occur between the input references and the

environment, and between the input references mutually. See Figure 38. For this reason, you

should connect the references to a system ground or another stable voltage. If the reference of

an input is connected to a high speed and / or high voltage signal, you should be aware of

parasitic capacitance. See Figure 38, Figure 40, Figure 41, and Figure 42.

Note

The input channels are electrically isolated from the USB port and from the power

adapter input.

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Fluke MDA-550-III Manual

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