PeakTech 2035 Bedienungsanleitung Seite 51

5. Use the TIME/DIV switch (15), A VARIABLE control (12) and the Horizontal POSTION control
(10) to display one cycle o trace over 7.2 divisions. When this is done, each major horizontal
division represents 50, and each minor division represents 10°.
6. Move the off-screen trace back on the CRT with its Vertical POSITION control, precisely
centering it vertically. Use the associated VOLTS/DIV switch and VARIABLE control to adjust its
amplitude to exactly 6 vertical divisions.
7. The horizontal distance between corresponding points of the waveform is the phase difference.
For example, in the Figure 2-10 illustration the phase difference is 6 minor divisions, or 60°.
8. If the phase difference is less than 50° (one major division), set the x10 MAG switch is x10, and
use the Horizontal POSITION control (if needed) to position the measurement area back on
screen. With 10 x magnification, each major division is 5° and each minor division is 1°.
Lissajous Pattern Method
This method is used primarily with sine waves. Measurements are possible at frequencies up to 500 kHz,
the bandwith of the horizontal amplifier. However, for maximum accuracy, measurements of small phase
difference should be limited below 50 kHz.
To measure phase difference by the Lissajous pattern method, proceed as follows:
1. Rotate the TIME/DIV switch fully clockwise to its X-Y position.
Caution: Reduce the trace intensity least the undeflected spot damage the CRT phosphor.
2. To measure by setting INV to NORM and X5 MAG to X1.
3. Connect one signal to the CH 1 or X IN connector (24), and the other sight to the CH 2 or Y IN
connector (22).
4. Center the trace vertically with the CH2 Vertical POSITION control (7) and adjust the CH 2
VOLTS/DIV switch (23) and VARIABLE control (20) for a trace height of exactly 6 divisions (the
100 % and 0 % gratitude linestangent to the trace).
5. Adjust the CH 1 VOLTS/DIV Switch (26) for the largest-possible on-screen display.
(a) Phase Angle Calculation
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