Operators Familiarization
if A Trigger SLOPE is
" V
and measurement is FALL, A
Trigger level is set near the 90% level (as determined
by the FALL measurement's peak acquisition).
If A Trigger SLOPE is
" V
and measurement is RISE or if
A Trigger SLOPE is ~ r and measurement is FALL, A
Trigger level Is set near the SO% level.
if the RISE/FALL measurement’s peak acquisition should set the
10% and 90% levels incorrectly (for example, if the signal being
measured has severe overshoot), the A Trigger level may be set in
correctly as well, causing loss of A sweep. If this happens when A
Trigger MODE is AUTO LEVEL, the A sweep will be regained but the
RISE/FALL measurement may not be triggering properly. In1
this
case (if the signal overshoot isn't too bad), the
k -
SET REF-M func
tion can be selected to manually set the 0% and 100% levels.
NOTE
RISE and FALL time measurements may have trouble triggering on
signals that are around 50 MHz o r higher. If this happens, try
changing A Trigger SLOPE and/or A Trigger LEVEL.
TRIG 10-90 is the default when RISE or FALL Is first called up. When
selected, the C/T will set the trigger levels at the 10% and 90% points
between the 0% and 100% reference levels.
TRIG 20-80 may be selected after a RISE or FALL measurement has
been started up. When selected, the trigger levels are recomputed for the
20% and 80% points between the 0% and 100% reference levels.
Selecting either TRIG 10-90 or TRIG 20-80 does not cause another peak
acquisition to occur. Instead, the old 0% and 100% reference levels are
used.
M- SET REF-H 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 k- 0% and
100% -H cursors appear. The k» and -*| 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 k- SET REF -H
menu button again or press the RISE or FALL menu button. The new
10%/9Q% {or 20% /80% ) levels will be calculated and set, and the RISE/
FALL measurement will continue.
2252 Operators
3-21
Summary of Contents for 2252
Page 17: ...SECTION 1 INTRODUCTION 2252 Operators ...
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Page 27: ...SECTION 2 CONTROLS CONNECTORS AND INDICATORS 2252 Operators ...
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Page 55: ...SECTION 3 OPERATORS FAMILIARIZATION 2252 Operators ...
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Page 107: ...SECTION 4 OPERATOR CHECKS AND ADJUSTMENTS 2252 Operators ...
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