12-12 824 Reference Manual 11/8/00
This very simple display shows all the required values for
the calibration of the pulsed tone capabilities of an audiome-
ter. Present the pulsed tone at a proper level and press the
RUN/STOP key
. The stability of the measurement can be
evaluated visually. To retrieve data, press RUN/STOP again
and read the values from the screen.
The following values are displayed: rise time, fall time, on
time, off time, plateau duration, in milliseconds, as well as
overshoot in dB.
Use figure 10-1 on page 10-13 for
greater clarification of the values
displayed.
• Rise Time (B-C) - time in milliseconds between the -20
dB point (referred to the maximum level) and -1 dB point
on the rising edge of the pulsed signal envelope, nomi-
nally between 20 and 50 ms
• Fall Time (E-G) - time in milliseconds between the -1 dB
point and -20 dB point on the falling edge of the pulsed
signal envelope, nominally between 20 and 50 ms
• On Time (J-K) - time in milliseconds between successive
-5 dB points of the envelope of the pulsed signal during
which the signal is present, nominally between 190 and
260 ms
• Off Time (F-J)) - time in milliseconds between succes-
sive -5 dB points of the envelope of the pulsed signal
during which the signal is absent, nominally between
190 and 260 ms
“ xxxx ” indicates that the On/Off
level ratio is greater than 20 dB.
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