EXFO FTB-2 - Manual (Page 334)

Data Types
324 FTB-2 and FTB-2 Pro
Applicable Data Types for Input—IEEE 488.2

<SUFFIX PROGRAM DATA>
This data type is used when units and multipliers have to be sent.
Examples: nm, kHz, km/s2, uW
A relative unit (dB) can be referenced to an absolute level, as shown on the
following diagram.
Examples: db, dbm, dBW
<wsp> /
<suf f ix unit>
<suf f ix mult.> <suf f ix unit>
<digit>
-
-
<digit>
/
.
D/d B/b
<suf f ix mult.> <suf f ix unit>