Welch Allyn TM286 Auto Tymp - User Manual - Manual (Page 31)

Directions for Use Operation 27
audiometry mode defaults to 1000 Hz at 0 dB HL, the cursor is positioned at the
corresponding location on the audiogram.
Please note that even though tabular format may be selected for the audiometric test
results on the printout, the LCD display is always in the audiogram format.
To change the frequency
1. Press the Hz button.
2. If the Hz button is pressed once momentarily, the frequency increases to the
next frequency in the range.
3. If the Hz button is held down continuously, it is possible to quickly scroll through
the available frequencies. Note that if the button is held down past the 8000 Hz in the
normal range (6000 Hz for the narrow range), the frequency scroll wraps around to
the lowest frequencies (i.e., 125 Hz with the normal range and 500 Hz with the
narrow frequency range). The reverse occurs if the
Hz button is pressed.
In addition to changing the frequency, the and buttons change the position of the
cursor on the audiogram. The frequency value of the cursor position on the audiogram is
displayed on the right side of the screen.
To change the intensity level of the test tone
1. Rotate the dB HL knob in the clockwise direction to increase the intensity level in 5
dB steps; rotate the knob in the counterclockwise direction to decrease the intensity
level in 5 dB steps.
The cursor on the audiogram moves up and down accordingly. Also, the dB level displayed
above the frequency value on the right-hand side of the audiogram changes. For each
frequency, there is a fixed intensity range available while rotating the dB HL knob as
follows:
It is possible to extend the intensity range per frequency 10 dB by pressing the
button. The button may only be selected when the intensity level is set to the highest
value in the normal range. For example, with the test tone of 1000 Hz, the normal
intensity limit is 90 dB HL. When the intensity knob is rotated clockwise to select beyond
90 dB HL, the intensity value above the 1000 Hz to the right of the audiogram flashes
indicating the maximum intensity limit has been reached. To go beyond 90 dB HL, select
the 10dB button. A large + sign appears on the screen below the 1000 Hz value. The dB
HL knob can be rotated through two additional positions, 95 and 100 dB HL. Rotating the
dB HL knob to the next position beyond 100 dB causes the intensity value 100 to flash on
the screen to the right of the audiogram; this indicates that the maximum dB HL for the
extended range has been reached. If the dB HL knob is rotated one more position beyond
the flashing 100 dB position, the letters NR appear next to the letters dB above the 1000
Hz. This permits the selection of the no response (NR) symbol on the audiogram during
testing. The extended range remains selected until either the intensity level for that
Frequency Intensity Range
125 Hz -10 to 50 dB HL
250 Hz -10 to 70 dB HL
500 to 4000 Hz -10 to 90 dB HL
6000 Hz -10 to 85 dB HL
8000 Hz -10 to 70 dB HL
+10dB