Keysight E4980A User Manual page 264

Overview of Remote Control
Data Transfer
Figure 8-24 8 bytes, IEEE754 floating point format
The real number RN represented in the floating point format is provided by
employing the following formula. (EXP: Exponent part (E) converted to decimal,
f: Fractional part (F) converted to decimal notation)
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•
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For example,
S = 1
EXP = 0111111 1111 (1023)
f =
1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
(251)

RN = (-1)1  2(1023 - 1023)  {1 + (251 / 252)}
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When
0 < EXP < 11111111111 (2047)
RN = (-1)S  2(EXP-1023)  {1 + f / (252)}
When EXP = 0
RN = (-1)S  2-1022  {f / (252)}
When EXP = 0, f = 0
RN = 0
= -1  1  1.5
= -1.5
Keysight E4980A/AL Precision LCR Meter