The bargraph is always on a linear scale. There is a tick mark at each
10% of the scale.
The maximum and minimum values measured are shown as an
expanded part of the scale (see Figure 4-37). To reset the maximum
and minimum values, press the BARGRAPH key. The printout from a
bargraph will also show the specific numerical values of maximum,
minimum, and current readings.
The center soft key allows the selection of AUTORANGE or
HOLDRANGE. In order to obtain the wide dynamic range necessary
for measuring audio levels, the amplitude meters are equipped with
ranging amplifiers, which automatically prescale the signal so that it is
in the best range for measurement. This is called autoranging. When
the ranging amplifiers change ranges, the reading may glitch. These
glitches can destroy the validity of the maximum and minimum values.
The autoranging may be turned off (holdrange mode) to avoid these
glitches, and the range will stay as currently selected. The penalty to
this is that there will be a maximum limit to the amplitude that can be
measured in this range, and the resolution may be limited at low
amplitudes. As long as the reading doesn’t vary much after entering
holdrange mode, the range will be ideal.
The speaker output is taken after the ranging amplifiers, so Holdrange
mode will also keep the speaker signal from autoranging. This may be
useful for audible monitoring of signals with a wide dynamic range.
Holdrange mode will be maintained after exiting bargraph mode, but
autorange will be selected if a new measurement function is chosen.
The units for the bargraph can be changed by pressing the upper right
soft key. This will change the units of both the numerical reading and
the bargraph. However, the units of the numerical reading may be
changed by going to the Main Panel and changing the units there
(using the same soft key). When you return to the Bargraph Panel, the
bargraph units will be the same as they were before, but the numerical
display will show the newly selected units. The Portable One Plus
Access remembers separate units for each numerical display and the
bargraph for each measurement function.
4 Operation
Operation Controlling the Analyzer : Bargraphs
4-58 Portable One Plus Access User's Manual
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