18
Testing FM Systems with FONIX 6500-CX Analyzers
Figure 1.3.4
EHA65—hearing aid response at 65 dB SPL
5. Once the curve is stable, press [FREEZE] to pause the measurement. If the 6500-CX
has the Multi-Curve Option, press [START] (not [CONTINUE]!) to save the curve
into the Multi-Curve stack. For units without Multi-Curve, press [CRT] to print the
measurement.
6.
This will be referred to as the Electroacoustic Hearing Aid Response or EHA65. See
Figure 1.3.4.
1.3.5 Test FM+ENV microphones with typical input to FM microphone — EFE80
1.
Set up the FM system according to Section 1.1.3. The FM receiver should be set to
receive FM+ENV.
2. Use
[
∧
] to adjust the signal level to 80 dB SPL.
3.
This curve will be referred to as the Electroacoustic FM Response or EFE80.
4. To view the EFE80 and EHA65 on the same screen requires the Multi-Curve Option:
a. Press
[MULTI].
b. Highlight
MULTIPLE
CURVES.
c. Press
[START].
d. If necessary, use [<, >] to display CRV 1 in the first slot. This curve is EFE80 or
the Electroacoustic FM and Environmental Response with 80 dB input to the FM
microphone.
e. Use
[
∨
] to select the second slot.
