|Printable Alignment instructions - complete|
or Go Directly To Bias Procedure
NOTE: This is amount of magnetism that is recorded onto magnetic
tape when you record a "0vu" tone.
A '+9 level' recording has more magnetism at "0vu" than
a "+3 level" recording at "0vu".
Say you want an Operating Level of '+5' on tape,
and only have a +3 level test tape.
Since 0 VU (your reference level on the RECORDER'S VU METERS)
should equal +5 level, you would see -2 on the VU meter
when a tape 2 db lower is played back.
Since +3 is 2 db lower than +5, you would set the Level Set
Section of the test tape so the meter reads -2db VU. Thus '0VU' now
equals +5, your chosen Operating Level. Then all the tones on the
Test tape should equal that same '-2 VU' since all the tones on the
tape are equal level...
(remember in this case our Test Tone Tape is a "+3 level tape)
NOTE: We are only using the tape recorder's VU meters.
What this means is that when we playback a signal we recorded
at our 'operating level' the VU meters on out recorder will
read '0vu'.... the output of the tape recorder will be the standard
'+4dbm' of course, since that's the way machines are set up.....
Thus ANY REFERENCE LEVEL at '0vu' will be '+4dbm' at the machine's
output jacks. We set the playback and record levels to record
a MAGNETIC LEVEL onto tape that corresponds to our desired 'reference
level', but that reference level should always be adjusted so it reads
'0vu' on the machine's vu meters... no matter if we choose a "+3" level,
a "+6" level or a "+9" level... they all should read '0vu' on the
TAPE RECORDER's VU meters.
Zero VU on the tape recorder (in playback
and recording) is always equal to our desired 'reference level
if the machine is aligned correctly.
I know this is confusing, but you need to grasp this in order to do correct
alignments for your clients - so spend some time on 'Operating Levels'
if you don't have your own Test Tone Tape, you can buy them from
us, and get about a 5 - 10% discount off the list prices.
|No O'scope Azimuth Procedure|
|Alignment Tones for Download|