LOCAL OPERATION
3-17
AF Setup page
This page allows the following optional settings to be selected:
Audio Level Measured in:
Repeated presses of the adjacent soft key will toggle through
Volts, dBm, dBV or Watts and
highlight the selection in inverse video.
The level of a signal applied to the AF input socket is measured in terms of the selected option.
This will then apply to all subsequent measurements.
The indicated output level from the AF generators is not affected by this selection.
Audio Input Impedance Match:
The impedance selected by this key is used by the Service Monitor to calculate and display the
measured voltage as a power (in dBm). Note that the impedance of the AF input remains high. To
obtain an accurate measurement the necessary terminating impedance must be added externally.
Audio Input Impedance:
This key is only active if the 600 Ω interface option is fitted. Pressing it will toggle between the
600 Ω balanced input impedance or the standard high impedance. The AF input connector on the
front panel is used in either case.
Audio Output Impedance:
This key is also only active if the 600 Ω interface option is fitted. Pressing it will toggle between
the 600 Ω balanced output impedance or the standard low impedance. The AF generator output
connector on the front panel is used in either case.
20 dB audio attenuator:
This key is also only active if the 600 Ω interface option is fitted. Repeated presses of it will insert
or remove a 20 dB attenuator from the output circuit of the audio amplifiers. With the attenuator
in circuit the maximum output is limited to 400 mV. The adjustment resolution is increased to
0.01 mV below 40 mV and to 0.1 mV from 40 mV to 400 mV.
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