## Description

Floating point double precision measurements. This class mirrors the standard measurement events is [CLASS1.MEASUREMENT=12](./class1.measurementx2.md). The measurement unit is always expressed in the standard unit.

The value is a "double"	- IEEE-754, 64 Bits, double precision.

    s eeeeeeeeeee mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
    s = sign bit ( 1-bit )
    e = exponent ( 11-bits )
    m = mantissa ( 52-bits )

 | Byte | Description                     |
 | ---- | -----------                     |
 | 0    | s e10 e9 e8 e7 e6 e5 e4         |
 | 1    | e3 e2 e1 e0 m51 m50 m49 m48     |
 | 2    | m47 m46 m45 m44 m43 m42 m41 m40 |
 | 3    | m39 m38 m37 m36 m35 m34 m33 m32 |
 | 4    | m31 m30 m29 m28 m27 m26 m25 m24 |
 | 5    | m23 m22 m21 m20 m19 m18 m17 m16 |
 | 6    | m15 m14 m13 m12 m11 m10 m9 m8   |
 | 7    | m7 m6 m5 m4 m3 m2 m1 m0         |
