Tektronix 2247A

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Operators Familiarization
peak acquisition to occur. Instead, the old 0% and 100% reference
levels are used.
l¢+ SET REF may only be selected after a rise or fall measurement
has been started up. When selected, the RISE/FALL measurement
halts, the message “ADJUST REF CURSORS” Is displayed, and the
l— 0% and 100% -{ cursors appear. The |¢ and -4 cursor-positioning
knobs may then be adjusted until the desired 0% and 100% reference
levels are set. To restart the RISE/FALL measurement, either press
the | SET REF -4 menu button again or press the RISE or FALL menu
button. The new 10%/90% (or 20%/80%) levels will be calculated and
set, and the RISE/FALL measurement will continue.
(TO PROP DELAY MENU)—selects the propagation delay menu. In
this menu, PROPDLY Is the actual measurement.
PROPDLY
SET ZERO REF
Propagation Delay menu
PROPDLY measures propagation delay between two trigger sources.
When first selected, the peaks of each B Trigger source are acquired
and the trigger levels are set; then the measurement starts. B Trigger
MODE Is not settable, and the B Trigger MODE LEDs are turned off,
as are the B Trigger SOURCE LEDs. B Trigger SLOPE and CPLG are
settable. B Trigger LEVEL may be set manually after the measure-
ment starts. The triggering range Is the same as In B NORM Trigger
MODE. The following error messages are possible:
Message Reason
NO A SWEEP No A sweep was detected after timeout.
NO START No start trigger was detected.
NO STOP No stop trigger was detected.
>100s Time Interval greater than 100 seconds (timeout
disabled).
2247A Operators 3-23