Belar FMHD-1, Operator'S Manual

Page: 34 / 58

FMHD-1 Operator’s Manual
Page 26 FMHD-1
In “
Past
” time mode, peak readings are collected over the duration set by “
Hold Time
”. At the end of
the
Hold Time
interval, the highest value occurring during that interval is displayed. Minimum and
Average readings during that interval are computed and displayed in the bargraphs. The hold-interval
timer is then restarted.
Hold Time:
This is the duration of the time interval over which Real and Past time indications are
collected before the readings presently displayed are updated. For “
Real
” time indications, the “
Hold
Time
” is the maximum duration of the collection interval. It may be shorter. “
Hold Time
” window
durations may be set to 0.25, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0 seconds.
Infinite:
When “ ON ”, the maximum and minimum peak modulation values collected over a semi-infinite
interval are displayed.
Remote:
When “
ON
,” permits remote access to the FMHD-1 via the RS-232 and RJ-45 rear-panel
connectors. “
OFF
” blocks both RS-232 and Ethernet communications with the FMHD-1 .
Screen-Saver:
Blanks the display screen after a pre-set interval of encoder knob inactivity. The encoder
is used to set the inactivity interval from one hour to twelve hours in one-hour increments. “ OFF ” disables
the screen-saver. (The display is blanked by turning off the LCD screen backlighting.)
Reset Defaults:
Moving the cursor to this position and pressing the encoder knob resets all of the
FMHD-1 settings to their factory default values.
Reboot:
Moving the cursor to this position and pressing the encoder knob re-initializes all the FMHD-1
processors, just as would occur if the unit were powered-up.
6.3.2 Output Settings Popup Menu
This Popup Menu allows any one of fifty-six audio signals (or signal combinations) decoded or generated
by the
FMHD-1 to be assigned to each of the eight XLR analog outputs and six AES/EBU digital outputs
(available from three
75Ω BNC coaxial jacks) on the
FMHD-1 rear panel. These same fifty-six audio
signals may also be directed to the two individual channels of the front-panel headphone jack. The signal
level of the headphone signal pair is also adjustable via this menu.
Forty-eight of the output signals available consist of groupings of the four stereo audio signals L (left), R
(right), L+R (left-plus-right), and L–R (left-minus-right) ultimately derived from the eight digital audio
program streams possible in hybrid FM IBOC broadcasts. Thirty-two of these forty-eight audio signals
consist of the eight groupings of L, R, L+R, and L–R marked as taken from the eight possible digital
audio program streams (designated
HD1
through
HD8)
. These outputs are designated in manner of “
HD1
L ”, “ HD5 R ”, “ HD3 L–R ”, …, etc. Sixteen of these forty-eight audio signals consist of four groupings
these same L, R, L+R, and L–R audio signals alternately marked as taken from the outputs of the four HD
decoders, D1 through D4. These outputs are designated in the manner of “ D1 L ”, “ D3 R ”, …, etc. By
assigning an audio output to one of the (possibly) four FMHD-1 HD decoder outputs, any of the eight
audio program streams may be auditioned by simply re-assigning the input to that decoder using the
Program Selection Screen. (As the individual decoders use
HD1 through HD8 as their sources,
duplication of the program streams at the outputs is possible. This redundancy may offer some
operational convenience.)
The four analog outputs (L, R, L+R, and L–R) have only the single analog-FM source. These are marked
in the manner “
ANL L
”, “
ANL R
”, “
ANL L+R
”, and “
ANL L–R
”.