12
Phase Reverse) is achieved using the same method previously described.
Once the A/D converter is enabled,
the Channel Select screen on the m802 will show information re garding the current A/D converter configura-
tion. Beginning at the bottom left and moving across to the right, the following information is displayed: Cur-
rent sample rate, the A/D converter clocksource, professional / consumer data format, the AES3 transmission
format, and the clock status. The clock status window can display the following status messages:
•
Crystal
: m802 ADC is running on the internal crystal oscillator.
•
Locked:
The first stage wide lock-range PLL is locked to the incoming clock signal but s-Lock has not
been achieved.
•
s-Lock:
The s-Lock crystal based PLL has locked to the incoming clock signal. This assures the absolute
highest rejection of incoming clock jitter.
•
Invalid Clock:
The message flashes to indicate that the first stage PLL is not able to lock to the incom-
ing clock signal. This is usually indicates that the AdcFs setting does not match the incoming clock rate.
The A/D converter also configures the m802 level meters to display a 0dBFS scale instead of the standard dBu
scale. A/D converter sensitivity is factory set so that +22dBu level at the analog line outputs results in a 0dBFS
level at the A/D converter. An A/D OVER indicator is also provided on each channel. Any OVER event will be
latched until cleared by the user regardless of Peak Hold settings.
SetUp MoDe
The Setup mode displays a series of menus for various user setup options. When the optional A/D con verter
module is installed in the preamp there are a total of 6 setup menus and 4 if no A/D converter is installed. Step
through the various setup screens on a preamplifier by pushing the SETUP button. Once in Setup mode, press-
ing the SETUP button will step the top line of the display through the following menus:
Preset Store
* store preamp preset*
#:
01 store: go
The settings for each channel in a preamplifier can be manually stored for later recall in one of 15 user preset
registers. Gain, +48V, Phase and Group settings as well as optional A/D converter settings are stored in the preset
registers.
To select a user preset register, first push the DATA control to highlight the preset number digits. Next turn the
DATA control to increment the number to the desired register and then push the DATA control again. To store
the preset, turn the DATA control until the word “Store:” is highlighted. Next, push the DATA control. This will
highlight the word “go” as well. At this point turning the DATA control clockwise or counter-clockwise will exe-
cute the store function. The display will briefly display “*** Confirmed ***” and then return to the Channel Mode.
Note: A preamplifier will automatically store all of its current settings into a non-volatile memory whenever power is removed.
When power is restored the preamplifier will retrieve these settings. This ensures that no settings are lost during power line inter-
ruptions.
Preset Recall
*recall preamp preset*
#:
01 store: go
Registers 1 through 15 are available for user storage and recall. Register number 0 cannot be over-written and
contains a “null” set-up. The “null” setup sets all channels to the lowest gain setting, mic power off, phase reverse
off, mic input to 48V and deletes any channel groups. Pre-set register 0 is helpful when setting up for a new ses-
sion. Recalling a preset is identical to storing a preset (see Preset Store above).
