Fluke Hydra Series II User Manual page 239

Appendices
C
Binary Upload of Logged Data
just the most significant mantissa bit, so the raw binary byte stream value is 7f c0 00 00
(hex).
For all other measurement queries, Hydra Series II usually returns ±1e9 for overload
(OL) measurement values. However, for the LOG_BIN? query, Hydra Series II returns
Inf (infinity) instead. The IEEE floating point standard defines Inf as a positive or
negative maximum exponent number with a zero mantissa. Hydra Series II returns +Inf
as the byte stream 7f 80 00 00 (hex) and -Inf as ff 80 00 00 (hex).
Table C-1. Floating-Point Format
Sign Exponent Manitssa
1 bit 8 bits 23 bits (plus one hidden bit)
high byte High-mid byte low-mid bute low byte
(MMSB) (MLSB) (LMSB) (LLSB)
The C code in Figure C-2 converts raw data into a useful format for the Intel x86 (IBM
PC) architecture. The BCD time stamp is converted to integers, and floating point
numbers created for the totalizer and measurement values.
C-5