Larson Davis System 824, Reference Manual

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11/8/00 AUD (Optional) 12-11
You will notice that the Fundamental - reference level is
now zero as the reference level was set to equal the funda-
mental Level. The Fundamental level still shows the dB
level of the incoming signal.
Linearity information is only avail-
able on screen at the time of the
measurement and is not stored with a
file or printed to a report. By varying the amplitude level you will see the Fundamen-
tal - reference level change. Usually audiometers have steps
of 5 or 10 dB. You can also see the effect frequency has on
the accuracy of the amplitude linearity by varying the fre-
quency.
Pulse/FM Mode
In the Pulse/FM mode, the 824 can be used for the following
measurements:
• pulse measurements
• frequency modulation measurements
This mode consists of two screens: the Pulse/FM-a and
Pulse/FM-b screens.
Pulse/FM-a Screen
To access the Pulse/FM-a screen, press the VIEW key
,
then select Pulse/FM with the up/down arrows and press the
check key
.
This will display the Pulse/FM-a screen.