A&D Series 57ZZ Uživatelský manuál stáhnout pdf (Strana 20)

Compensating the Probe

Before using a passive probe, you need to compen-

sate it – to balance its electrical properties to a

particular oscilloscope. You should get into the habit

of compensating the probe every time you set up

your oscilloscope. A poorly adjusted probe can make

your measurements less accurate. Figure 27 shows

what happens to measured waveforms when using a

probe that is not properly compensated.

Most oscilloscopes have a square-wave reference

signal available at a terminal on the front panel

which can be used to compensate the probe. You

compensate a probe by:

• Attaching the probe to an input connector

• Connecting the probe tip to the probe compensa-

tion signal

• Attaching the ground clip of the probe to ground

• Viewing the square wave reference signal

• Making the proper adjustments on the probe so

that the corners of the square wave are square

When you compensate the probe, always first attach

any accessory tips you will use and connect the

probe to the vertical channel you plan to use. This

way, the oscilloscope has the same electrical proper-

ties for compensation as it does when you make

measurements.

Figure 27. The effects of improper probe compensation.

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A&D Series 57ZZ Uživatelský manuál Strana 20