Radio Shack 310 Uživatelský manuál stáhnout pdf (Strana 30)

MEASURING AN AC VOLTAGE

In oscilloscope measurements, the AC component of a

waveform is usually measured in terms of its peak-to-

peak value. You can easily make this type of measure-

ment by using the grid overlay on the oscilloscope

screen to measure the vertical distance between peaks

and multiplying this distance by the oscilloscope

screen’s deflection factor. The result is the actual peak-

to-peak voltage.

Follow these steps to measure a waveform’s peak-to-

peak AC component.

Caution

: To avoid an overload when measuring AC,

make sure the zero line is centered vertically on the

grid overlay.

1. Set the input coupling switch to

GND

Note

: When you set the input coupling switch to

GND

, the ProbeScope automatically resets the

trigger mode to

AUTO

2. Connect the

GROUND

(0 volt) wire to the signal

source’s ground or reference level.

3. Rotate

Zero Level

until the zero reference line is

centered vertically on the grid overlay.

Note

: If the trace is widened by stray interference,

ground the probe body near the point being mea-

sured. The trace position is the voltage reference

line and all voltage measurements are read in

respect to this line. (Do not adjust the vertical

positioning control after the reference is estab-

lished.)

22-310.fm Page 30 Friday, August 6, 1999 12:26 PM

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Radio Shack 310 Uživatelský manuál Strana 30