Tektronix 2252, Руководство оператора

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Operators Familiarization
k-
p h a s e d
—Calls up a lower level menu for phase measurement
operation.
Cursor positioning for delay and delta time setting are identical to the
K- SEC -4) mode. The value displayed for the phase-measurement
readout has units of degrees and is caiculated by the following formula:
Phase (in degrees)
(time difference)
(reference time)
X 360
When selecting the k~ PHASE -M measurement, a second menu is
displayed to permit the user to set the 360 degree phase measurement
reference.
k-
phase
-H
H - S E T 3 6 0 M )
3 6 0 ° T R A C K S A T R IG P E ftiO D
Phase Measurement Set Reference menu.
Select k-
p h a s e
~4( to continue with the phase measurement If the cur­
rent reference setting is correct. When Horizontal MODE is ALT or B, the
C/T measures the time difference between the two delays to calculate
phase (cursors may be used in B Horizontal MODE). When the C/T is
used, at) B Trigger modes are available, as in k - SEC -H and
k- 1 /SEC -4) (the selected mode is the same for both B delay and B delta
triggers).
To set a new reference manually, press k- SET 360 and position the
cursors to the new reference value using the k - OR DELAY TIME and -H
control knobs. After setting the new reference, press k~
p h a s e
to
continue the phase measurement.
if 360° TRACKS A TRIG PERIOD is selected (underlined), the C/T will
ignore the fixed reference (set w ithk- SET 360° -H) and automatically
measure the A trigger period for each phase measurement cycle, and
use this as the 360 degree reference. This feature is useful when phase
measurements are being performed on signals of varying frequency,
and/or highest possible measurement accuracy is desired. The 360°
TRACKS A TRIG PERIOD function toggles on or off each time its button
is pushed, and can be used while making phase measurements in either
A Horizontal MODE (using cursors) or ALT or B Horizontal MODES.
2252 Operators
3-17