EXFO FTB-1v2 Guia Del Usuario página 397

Data Types
Applicable Data Types for Output —IEEE 488.2
<NR3 NUMERIC RESPONSE DATA> (or <NR3>)

This data type will be used by a device to return positive or negative
exponential numbers (floating-point numbers).
+
.
<digit> <digit>
-
+
E
<digit>
-
Examples: 4.3E–3, –8.9456E8, 123E–5
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FTB-1v2 and FTB-1v2 Pro