Operating instructions

LOCAL OPERATION
3-64
To select and set up the audio generators press the[Audio Gen] key. This will display the audio
setup menu shown in fold out diagram (7-2).
Repeated presses of the [Gen1/Gen2] key will highlight the
AF1 and AF2 legends in turn to indicate
the selected generator.
Set up the audio generator(s) for the required frequency and output level by using the soft keys
and data input keys:-
[Gen 1/Gen 2] to select AF1, then, [FREQ][n]....[n][kHz/Hz]
[LEVEL][n]...[n][V/mV/dBm]
then [Gen 1/Gen 2] to select GEN2 if required,....[.../dBm]
The FREQ [×] and [Ø] and the LEVEL [×] and [Ø] keys can be assigned to AF generator
frequency and level. See Incremental adjustments which starts on page 3-68.
The shape of each audio generator output waveform can be either sine or square wave. This is
controlled by first selecting the audio generator as for
On/Off control above, then pressing the
[SHAPE] key to toggle between the options.
Input level measurement
The measured level of signals applied to the AF INPUT connector can be displayed in volts, dBm,
dBV or mW. The selection is made from setup page 2, as described under Audio Level Measured
in: on page 3-13. When the input level is displayed in dBm or mW, the signal is assumed to be
measured across the impedance selected on the Audio Input Impedance Match selection made
from setup page 2. (See Audio Input Impedance Match on page 3-13.)
The 600 Ω interface unit allows the Service Monitor to provide a 600 Ω termination. (See Audio
Input Impedance on page 3-13.) With the input impedance set at 600 Ω, the indicated level is that
of the input to the Service Monitor. With the input impedance set at
High, the indicated level is
that of the input to the Service Monitor with an assumed 600 Ω load.