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Dual Pass
If Dual Pass has been defined as the laser alignment method for the job, the laser
heads automatically acquire data using their built-in inclinometers as each laser
head passes by each other. Except for how the data is acquired, this method func-
tions similar to Auto Sweep, but like Manual Sweep, it is useful for performing
uncoupled or non-rotational alignments.
The arc of rotation can vary from as little as 45° to a full 360° (one revolution). This
method is especially useful when the 4 point measurement technique is impractical
or when inconsistencies in shaft position exist at points in the rotation.
With this method, PSD and angle data are only taken when the laser beam of each
laser head enters the "valid data" window centered on the vertical centerline of the
other head's PSD.
Laser Address Selection
Note
Both laser heads need to be turned on for this option to function
properly.
Note
With the Dual Pass method, a special cable is required to synchronize
the two laser heads since they will be moved independently of each
other and will not always be in alignment with each other. When
using direct connect communication, the Model 821510 direct con-
nect cable is connected between the laser heads and analyzer to syn-
chronize the laser heads while using the Dual Pass method. When
using RF communication, the Model 8215C2-PM Dual Pass cable is
connected between the two laser heads to synchronize the laser
heads while using the Dual Pass method. For longer spans the Model
800002 and Model 800003 extension cables can be added between
the Model 821510 direct connect cable and Model 8215C2-PM Dual
Pass cable and the laser heads. No matter which communication
method you choose to use, the appropriate cable must be connected
to the laser fixtures prior to initializing them.
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