B+K precision 2510B Series, User Manual, Page: 50 / 184

Acquisition System 50
Phase Deviation Calculation Example
1. Connect a sine wave signal to channel 1, and a sine wave signal of the same frequency but out of
phase to channel 2.
2. Enable XY mode.
3. Center the signal on the display with the channel 1 and 2 position.
4. Adjust the signals for convenient viewing.
5. Press the button.
6. Set the Y2 cursor to the top of the signal, and set Y1 to the bottom of the signal.
• Note the
Δ
Y value at the bottom of the display.
7. Move the Y1 and Y2 cursors to the intersection of the signal and the Y axis.
• Note the
Δ
Y value at the bottom of the display.
8. Calculate the phase difference using the formula:
sin 𝜃 =
𝑠𝑒𝑐𝑜𝑛𝑑 Δ𝑌
𝑓𝑖𝑟𝑠𝑡 Δ𝑌
If the principal axis of the ellipse is within quadrant I and III, the phase deviation angle obtained should
be within quadrants I and IV, namely within (0 to π/2) or (3π/2 to 2π). Suppose the principal axis of the
ellipse is within quadrant II and IV. In that case, the phase deviation angle obtained should be within
quadrant II and III, namely within (π/2 to π) or (π to 3π/2).
The X-Y function can be used to measure the phase deviation that occurred when the signal under test
passes through a circuit network. Connect the oscilloscope to the circuit to monitor the input and output
signals of the circuit.
To toggle XY mode:
1. Press the button.
2. Press the softkey to toggle XY mode on and off.