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11.3. CARRY OUT A REAL-TIME FIT TEST
Conduct a real-time fit test only if the headset has successfully
passed the procedures described in 9.2. DAILY CHECK
PROCEDURE.
NOTE
: Both earplugs must be fitted before performing a real-time
fit test. Noise must be present when test is performed.
For example, fit test in an area that requires hearing protection or
where you need to raise your voice to be heard by a person who is
at least an arms-length away.
Be sure not to talk or chew while the fit test is being performed.
The first time a real-time fit test is performed, you will be prompted
to select the eartips you have attached to the earpieces.
Audio message: “Please select an eartip type through the menu
before conducting a fit test”. Each time the eartip type is changed,
the type must be updated within the Eartip selection menu.
Use the Power/Menu button to cycle through
the menu options until you hear the audio
message “Eartip selection – (Unknown, Skull
Screw, UltraFit, etc.)”. Use (+) or (-) buttons to
cycle through the options to choose/change
the eartip you intend to use. The audio prompt
will identify the eartip selected and is saved
automatically.
Press the Power/Menu button again to return to the menu options.
After 2 seconds of non-activity, you will be brought back out of the
menu.
The SCU will show the real-fit test progress and result by means of
the indicators (1).
To start a real-time fit test:
Press and hold the Fit test/channel button (2) for 1 second.
Release when you hear a beep.
1
2
The real-time fit-test process begins and can be observed by the
white channel light indicators as described below.
LED indicators
Description
What to do
Real-time fit test
is running.
Audio message:
“Fit test in
progress”.
No action
required.
LED indicators
Description
What to do
A and B = White
Real-time fit test
successful. Able
to report a result
for both ears.
Audio message:
“PAR value +
eartip type”.
Audio message
when headset
calibration has
expired: “PAR
value + eartip
type + calibration
status expired.”
Audio message
when unable to
assess the
calibration status:
“PAR xx dB
<eartip type>
calibration status
unknown”.
No action
required.
Replace with
new calibrated
headset. See
12.14
Calibration
Status for more
information.
Contact 3M
Technical
Assistance.
A= Orange, B=White
Real-time fit test
unsuccessful for
right ear. Unable
to report a result.
Audio message:
“PAR out of range
(low). Refit right
earplug and
retest.”
“PAR out of range
(high) Check
eartips and
retest.”
Refit right
earplug and
retest.
Check or refit
right eartip, refit
and try again.
A= White, B=Orange
Real-time fit test
unsuccessful for
left ear. Unable to
report a result.
Audio message:
“PAR out of range
(low). Refit left
earplug and
retest.”
“PAR out of range
(high) Check
eartips and
retest.”
Refit left
earplug and
retest.
Check or refit
left eartip, refit
and try again.
A and B = Orange
Real-time fit test
unsuccessful for
both ears. Unable
to report a result.
Audio message:
“PAR out of range
(low). Refit both
earplugs and
retest.”
“PAR out of range
(high) Check
eartips and
retest.”
Refit both
earplugs and
retest.
Check or
replace both
eartips, refit
and try again.
A
B
A
B
A
B
A
B
EN
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