Owner`s manual

MEASURING THE DC BIAS

VOLTAGE OF AN AC SIGNAL

If you are measuring the DC component of an AC sig-

nal (AC on a DC bias), calculate the waveform’s aver-

age vertical distance from the zero reference line as

follows:

Note

: The average level of a pure sinusoidal, square,

or triangular waveform is the midpoint between the

positive and negative signal peaks.

1. Repeat Steps 1–9 of “Measuring a DC Voltage”

on Page 24.

2. Apply the probe tip to the signal source. The oscil-

loscope grid display vertically displaces the signal

away from the zero reference line.

3. Click on the oscilloscope hold icon.

4. Calculate the DC bias using the

oscilloscope’s grid display as fol-

lows:

a.Place the mouse cursor directly over the oscillo-

scope screen’s upper horizontal cursor until the

cursor’s shape changes to a cross.

Midpoint

HOLD

22-310.fm Page 28 Friday, August 6, 1999 12:26 PM