dBr Zero Key
The dBr Zero key is used to set the internal dBr reference value to the
value of the current measurement.
MONITOR Operation
The Portable One Plus Access has a built-in monitor for audible
monitoring of signals, either with stereo headphones or through a
built-in speaker.
To use stereo headphones, plug them into the MONITOR jack. To use
monophonic headphones, a special stereo-to-mono headphone
adapter must be used. When headphones are connected, the internal
speaker is disabled.
The MONITOR Knob controls the amplitude of the headphones or the
internal monitor speaker.
Normally the speaker or headphones will monitor the input signal, so
the signal heard will be the same as the signal at the input. There is a
jumper inside the instrument which allows this to be changed so that
the monitor follows the measured signal, after being processed for the
reading. To make this change, see Appendix C.
Setup Panel
The Setup panel is available by several presses on the PANELS key. It
provides access to several parameters relating to the general operation
of the instrument. The Setup panel looks like this:
On the Setup panel are controls for the type of printer output, the date
and time, display inversion, and the step sizes used by the INC and
DEC keys.
Figure 4-8. Setup Panel
& For more
information on
dBr and the
reference value,
see the section
on Units, page
4 Operation
Operation Overview : dBr Zero Key
4-8 Portable One Plus Access User's Manual
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