Tektronix 2247A

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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 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.
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 A Trigger CPLG set to NOISE REJ (not allowed,
CPLG because this would cause Incorrect measurement
triggering).
INCREASE Source signal's pk-pk amplitude is too low
SIGNAL for accurate rise/fall measurement; should be at
AMPLITUDE least 4 divisions.
MEAS SOURCE This message Is shown If the source
INPUT IS coupling is set to GND.
GROUNDED
MEAS SOURCE Trigger levels cannot be computed correctly
VAR OUT OF unless attenuator Is calibrated.
DETENT
2247A Operators 3-21