Operators Familiarization
FALL measurements are the same as RISE, except that the fall time is
measured.
The following error messages are possible during RISE and FALL
measurements:
Message
NO A SWEEPf
Reason
No A sweep was detected after timeout.
NO START
No start trigger was detected.
NO STOP
No stop trigger was detected.
NO RISE
No rising edge was seen by C/T during a rise time
measurement, after timeout.
NO FALL
No falling edge was seen by C/T during a fall time
measurement, after timeout.
> 100s
Time interval greater than 100 seconds (timeout
disabled).
CHANGE A
CPLG
A Trigger CPLG set to NOISE REJ (not allowed,
because this would cause incorrect measurement
triggering).
INCREASE
SIGNAL
AMPLITUDE
Source signal’s pk-pk amplitude is too low
for accurate rise/fali measurement; should be at
least 4 divisions.
MEASSOURCE
INPUT IS
GROUNDED
This message is shown if the source
coupling is set to GND.
MEAS SOURCE
VAR OUT OF
DETENT
Trigger levels cannot be computed correctly
unless attenuator is calibrated.
NOTE
For RISE and FALL measurement, if the measurement channel is
the same as the A Trigger channel, the A Trigger level Is auto
matically adjusted to try to guarantee that the measurement will
trigger properly, as follows:
If A Trigger SLOPE Is ~f~ and measurement is RISE, A
Trigger level Is set near the 10% level (as determined
by the RISE measurement's peak acquisition).
3-20
2252 Operators
Summary of Contents for 2252
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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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