Tektronix 2247A

Operators Familiarization
fe pHase >
te seT 360°-4
360° TRACKS A TRIG PERIOD
Phase Measurement Set Reference menu
Select } PHASE -4 to continue with the phase measurement If the
current 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, all B Trigger modes are available, as inl SEC -4 and
I+ 1/SEC -4 (the selected mode is the same for both B delay and B
delta triggers).
To set a new reference manually, press I- SET 360°-1 and position
the cursors to the new reference value using the l- OR DELAY and +
control knobs. After setting the new reference, press |- PHASE - to
continue the phase measurement.
If 360° TRACKS A TRIG PERIOD Is selected (underlined), the C/T will
Ignore the fixed reference (set with }- SET 360° -4) and automatically
measure the A trigger perlod for each phase measurement cycle, and
use thls 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 measure-
ments In either A Horizontal MODE (using cursors) or ALT or B Horl-
zontal MODES.
If |} SEC >I, le 1/SEC >, or k- PHASE -3 measurement is selected while
In B Horizontal MODE, Cursor Knob Allocation menu 2 (shown previously In
this section under “Cursor Volts Measurements”) is displayed, and the user
can choose one of two possible modes (the selected measurement will
start up using the previously selected mode):
If Is selected In this menu, the cursor knobs will control the two
time cursor positions as In A horizontal mode, except that these cursor
Positions are scaled to the B sweep time/div setting. The l- OR DELAY
control knob positions both cursors (reference and delta) together,
and the -4 control knob positions the Independent delta cursor.
2247A Operators
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