Agilent Technologies 4349B, Руководство пользователя

Страница: 145 / 233

4349B
REAL
Figure 5-11. Real Data F ormat
This data eld is initiated by a unique code , the number sign (#). The second byte ,
\<num digit>" designates the number of the bytes for the \<num bytes>". \<num bytes>"
designates \<data bytes>" length. \<new line>^END" is the response message terminator .
\<data bytes>" contains the data in the IEEE 754 oating point numbers of 64-bits . This is
the same data format used by the HP technical computers , such as the HP 9000 series 200/300
computers .
The real number RN represented in oating point format are provided by following formula:
When 0 < e < 11111111111 (2047)
RN = (01)
S
2 2
(EXP-1023)
2 (1 + f/2
52
)
When e = 0
RN = (01)
S
2 2
-1022
2 (f/2
52
)
When e = 0, f = 0
RN = 0
Where ,
s value of sign part (binary)
e value of exponential part (binary)
EXP decimal expression of exponential part
f decimal expression of fractional part
GPIB Reference 5-41