DSL FP40 method - Frye Electronics

HA-2
Coupler
Probe mic
To 3A
insert earphone
Figure 1
Use tape or putty to
seal this connection
25 mm
(I.D. 1.93 mm)
Not more than
3mm
Probe calibrator
adaptor
Putty to hold probe
tube in place
5. Press START button to introduce the composite signal. Wait for a few seconds to
ensure that the measured response has stabilized. Press START button again to
terminate composite signal delivery.
Version 3.30 and higher: Press F2 to highlight SPL. Then press F3 to select
AIDED 1. Press DATA to print the results.
Note: When using a pure tone the signal will stop automatically at the end of
the sweep. The resulting curve is labeled UNAIDED RESPONSE on the small
graph on the right side of the LCD display.
III. REAL EAR MEASURE
1. Prepare individual for probe tube microphone measure (headband & earhook).
2. Insert probe tube into individual’s ear canal to required insertion depth (from
the inter-tragal notch), using as a guideline: 28 mm for adult females, 31 mm for
adult males, and 20-25 mm for children (use otoscopy to ensure that you do not
touch the child’s eardrum).
3. Since the reference microphone is disabled, you can attach it to the back of the
individual’s clothing or the velcro headband.
4. Insert the child’s custom earmold (or the standard foam coupling).
5. Couple the plastic tip of the insert earphone to the earmold tubing, and deliver
signal as outlined in step II, i.e., press start/stop (see figure 2).
Version 3.30: Press F3 to select AIDED 2, then use AMPLITUDE knob to change
RMS Source to 50 dB for CRV 2 (AIDED 2) test.
2 DSL Method Using FP40/FP40-D