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68 The DSL/NAL-NL1 Module WinCHAP User’s Manual
FP40 users should note that the WinCHAP RECD procedure differs from the
FP40’s built-in RECD procedure.
Probe calibrator
adapter
HA-2
Coupler
Putty to hold probe
tube in place
Probe mic
To
3A
insert earphone
Not more than
3mm
25 mm
(I.D. 1.93 mm)
Use tape or putty to
seal this connection
Ear level adapter
Figure 6.2.4.1A—Coupling of the probe microphone to the insert earphone using an HA-2
coupler.
Figure 6.2.4.1B—RECD Measurement window