A&D Series 57ZZ Manual do Utilizador descarregar pdf (Página 19)

described elsewhere in this document. Figure 25

shows a simple diagram of the internal workings of a

probe, its adjustment, and the input of an oscillo-

scope.

Figure 26 shows a typical passive probe and some

accessories to use with the probe.

Using Active Probes

Active probes provide their own amplification or

perform some other type of operation to process the

signal before applying it to the oscilloscope. These

types of probes can solve problems such as circuit

loading or can perform tests on signals, sending the

results to the oscilloscope. Active probes require a

power source for their operation.

Using Current Probes

Current probes enable you to directly observe and

measure current waveforms. They are available for

measuring both AC and DC current. Current probes

use jaws that clip around the wire carrying the

current. This makes them unique since they are not

connected in series with the circuit; therefore, they

cause little or no interference in the circuit.

Where to Clip the Ground Clip

Measuring a signal requires two connections: the

probe tip connection and a ground connection.

Probes come with an alligator-clip attachment for

grounding the probe to the circuit under test. In

practice, you clip the grounding clip to a known

ground point in the circuit, such as the metal chassis

of a stereo you are repairing, and touch the probe tip

to a test point in the circuit.

Figure 26. A typical passive probe with accessories.

Figure 25. Typical probe/oscilloscope 10-to-1 divider network.

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A&D Series 57ZZ Manual do Utilizador Página 19