), cancels the test level. Note that the level difference between the two channels
can be measured easily by setting the test level on one and then selecting the other.
The same key combination,
, on the LA102 stores the current reading and
subsequent readings are shown relative to this on the numerical readout. The bar-graph,
however, always reads absolute. A test level may be set for the functions level, noise and
crosstalk, and it then operates on all these measurements until cancelled by another
or a reset. It does not operate on distortion, which uses its own reference level, or on
W&F.
2.7 Measurement Options Meter characteristic Level measurement Measuring level Level options
To select the measurement option for the current function (level, noise etc), press
followed by the option number, to . More obscure measurements are
available as options 6 to 10 which are selected by pressing
to , and options 11
to 15 which are selected by pressing
followed by to . In all cases a menu appears
listing the 5 options which can be selected (fig. 2.7 & 2.8). Once options 11 to 15 are
selected for a particular function, they will be listed next time the
key is
pressed, and
should be used to return to options 1 to 5. Pressing from the
menu display cancels the option menu.
In the case of level measurement, for example, option 1 is wideband rms, option 2 is
22Hz-22kHz bandwidth rms, and option 3 gives the same bandwidth with a VU meter
characteristic. Level option 5 provides a PPM (peak programme meter) characteristic, but
shows a dB bar graph instead of a true PPM scale (PPM 4 is 0dBu, PPM 5 is +4dBu, PPM
6 is +8dBu etc). Options are described fully in the relevant section below, and a full list
of options is given in table 2.6. Once changed, options remain set for each measurement
so that the user may switch between his own preferred set of measurements. Options, like
presets, are held in non-volatile memory, so remember to set them as required (or use
reset option 2 to restore the default options − see section 1.5).
Experienced users will realise that options 11 to 15 are generally similar to options 1 to 5,
but with a different filter (this is true for level options 11 to 15, distortion options 11 to 15
and noise options 12 and 13), and may like to know that
provides a quick way of
toggling between options 1 to 5 and options 11 to 15 (where available).
19
2. Manual Operation
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