Making measurements from the trace
VI - 32
Virtual digital oscilloscopes, 60 MHz
Making measurements from the trace (continued)
c) Manual phase
measurements
This function is used to measure the de-phasing between two signals. It is
completely manual and at the user's discretion.
It is activated from the 'Measure’ menu:
It shows a third cursor that must be placed on the other signal:
The three cursors are free and can be placed anywhere in the trace display
window.
To measure a phase
•
Place the cursors "
1 =
blue
" and "
2 =
violet
" on the "reference" signal to
determine its period for the phase calculation (this period corresponds to
360°).
•
The "black" cursor is then placed on the other signal: if cursor 1 is
placed on an ascending wave with coordinates (X1,Y1), the black cursor
should be placed on the ascending wave of the other signal, as close to
X1 and on the same Y-Axis Y1 position as cursor 1.
The de-phasing value compared to the reference signal is given in
degrees.
A de-phasing only has meaning if the two signals have the same
frequency.
Value of the CH2
phase compared
to CH1 in our
example
The phase cursor
is placed on the
wave of the
secondary signal
Cursors 1 & 2 are
placed on a period
of the reference
signal
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