EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 345)

SCPI Command Reference
OTDR 331
Product-Specific Commands—Description
:CALCulate[1..n]:HFACtor?
Description This query returns the helix factor used for the
specified trace index.
Since *RST clears the helix factor value, the
returned value will be 0.
Syntax :CALCulate[1..n]:HFACtor?<wsp>TRC1|TRC2|T
RC3|TRC4
Parameter(s) Label:
The program data syntax for the first parameter is
defined as a <CHARACTER PROGRAM DATA>
element. The allowed <CHARACTER PROGRAM
DATA> elements for this parameter are:
TRC1|TRC2|TRC3|TRC4.
Trace index of the available wavelengths.
Response Syntax <HelixFactor>