23
D-0116493-B (OM015)
– PC850 Operating Manual
Contrast:
Adjust contrast using the SIGNAL
keys; then release
MENU
5.4.3.
DESCRIPTION OF FUNCTION OF OTHER KEYS
+20dB
This enables tone levels to be presented with up to 20dB higher output in manual
test mode; press the key and then use SIGNAL
to access the extra 20dB in 5dB
steps; an indicator above the key illuminates green to show that the function is
active
TALK OVER
Hold this key to interrupt the test and route the operator’s voice from the front panel
microphone to the headset; the level is adjusted with the SIGNAL
keys
LEFT
Press once to select the left ear (the indicator above the key illuminates green); if
the left ear is already selected, press again to store the displayed signal value as a
threshold (see Section 5.3)
RIGHT
Press once to select the right ear (the indicator above the key illuminates green); if
the right ear is already selected, press again to store the displayed signal value as
a threshold (see Section 5.3)
SIGNAL
Press the
keys to decrease or increase the level of the tone presented in 5dB
steps; to scroll through the range keep the key pressed
FREQUENCY
Press the
key to select a lower frequency and the
key to select a higher
frequency
PRESENT
Press to present the displayed test signal to the patient. The “PRESENT” indicator
above the display will be illuminated green during tone presentation
5.5.
THRESHOLD RETENTION FUNCTION
This function allows the thresholds determined for each ear and each frequency to be stored and displayed
for reference.
The operator can then review the results at the end of the test and record them on an audiogram card, transfer
them into the internal memory or transfer the results into the Amplivox Audibase application.
Once a threshold has been determined press the “selected” ear key once again and the level will be stored
and displayed in a similar way to that shown below.
To review the retained thresholds, use the FREQUENCY
keys to select the required frequency. The
threshold values for the left and right ears are shown on the lower line of the display as illustrated below.
SIGNAL dBHL
FREQUENCY Hz
30dB 4kHz
20 10
This display shows
thresholds at 4kHz
Thresholds retained
Left ear 20dBHL
Right ear 10dBHL
To clear the Threshold Retention memory, press and hold the MENU key, use the FREQUENCY
keys to
select “Clear test? No”. Press YES and then release the MENU key.
