FLUKE 190-204/AM/S User Manual for the Fluke 190-204/AM/S ScopeMeter Test Tool with SCC-290 kit, 200 MHz, 4 channels

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Fluke 190 Series II

Users Manual

• Additional safety. Since the commons are not directly

connected, the chance of causing short circuit when

measuring multiple signals is greatly reduced.

• Additional safety. 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 40). 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

40 , Figure 42, Figure 43 and Figure 44.)

Note

The input channels are electrically isolated from

the USB port and from the power adapter input.

Figure 40. Parasitic capacitance between probes,

instrument and environment

Warning

To avoid electrical shock, always use the

insulation sleeve (Fig. 1 item e)) or the probe

tip when using the probe reference (ground)

lead. The voltage applied to the reference lead

is also present on the ground ring near the

probe tip, see Figure 41.

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FLUKE 190-204/AM/S ScopeMeter Test Tool with SCC-290 kit, 200 MHz, 4 channels