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7.3.6
JIS-DAC
JIS-DAC mode (Japanese standard) is
similar to common DAC mode.
See also 7.3.2 for DAC interpolation modes
and 7.3.3 for DAC modes.
The reference (basic) JIS-DAC curve may
be set and then adopted from the DAC
TYPE 1 (see 7.3.2), or may be set directly
as DAC TYPE JIS-DAC6 by the same
procedure using calibration reflectors in the reference block.
The difference compared to DAC is that 5 (five) auxiliary curves will be set
automatically with fixed predefined offsets:
L-LINE
-12 dB (light blue);
M-LINE
-6 dB (magenta);
H-LINE
±0 dB (pink dashed – basic curve);
U-LINE
+6 dB (red);
U’-LINE +12 dB (orange);
U’’-LINE +18 dB (yellow).
Triggering level may be set to whichever of displayed curves by appropriate setting of
the TRIGGER value (L-LINE to U’’-LINE).
In the Status Window, an indication within the GATE 1 range is assigned to one of
seven zones (I to VII), in addition to relative dB value:
Zone I
below L-LINE;
Zone II
between L-LINE and M-LINE;
Zone III
between M-LINE and H-LINE;
Zone IV
between H-LINE and U-LINE;
Zone V
between U-LINE and U’-LINE;
Zone VI
between U’-LINE and U’’-LINE;
Zone VII above U’’-LINE.
