SQL Monitor sinusoidal test metric

DECLARE @c CHAR
DECLARE @i INT
DECLARE @mod INT
SET @c = 'a'
SET @i = 1
SET @mod = 0
WHILE(@c <> '')
BEGIN
SELECT @c = SUBSTRING(DB_NAME() ,@i,1)
SET @i = @i + 1
SET @mod = (@mod+CAST(CAST(@c AS VARBINARY(1)) AS INT))%60
END

SELECT  (SIN(((CAST(datepart(mi, getdate()) AS INT) + @mod)%60)/60.0*2*3.1415926)+1)*50