Tektronix 222 Operator's Manual page 82

Making Measurements-222 DSO Operators
read directly from the crt to determine the scaling factors for waveform
measurements.
VOLTAGE MEASUREMENTS. Waveform voltages are found by first
counting the vertical graticule divisions and partial divisions occu-
pied by the vertical portion of the display. Then simply multiply that
number by the VOLTS/DIV scale factor of the channel that is dis-
playing the waveform. To improve the accuracy of the measurement,
position the waveform both vertically and horizontally to take advan-
tage of the minor divisions of the center vertical graticule line.
For example, in Figure
5-1
the peak-to-peak amplitude of the sine-
wave signal is 5 divisions with a VOLTS/DIV readout of 0.2 V. Multi-
plying 0.2 V times 5 divisions gives a peak-to-peak voltage of 1 V.
POSITION WAVEFORM TO
CENTER GRATICULE LINE
MEASURE MPLITUDE
FROM
$
TO
@
- -
Figure 5-1. Peak-to-peak voltage measurement.