Welch Allyn TM 262 Auto Tymp - User Manual - Manual (Page 54)

TM 262
3-20 Revised 4/11/08
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.
Note that cursor moves up and down accordingly. Also, note that the dB level displayed
above the frequency value on the right-hand side of the audiogram changes as well.
For each frequency, there is a fixed intensity range normally available while rotating the dB HL
knob as follows:
However, in addition, it is possible to extend the intensity range per frequency by 10 dB simply
by pressing the +10 dB button. This +10 dB 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. Note that, 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 that the normal intensity limit has been reached. To go beyond 90 dB HL,
select the +10 dB button. Note that a large + sign appears on the screen below the 1000 Hz
value. Now, the dB HL knob can be rotated through two additional positions, namely, 95 and
100 dB HL. If you rotate the dB HL knob to the next position beyond 100 dB, the intensity
value 100 flashes on the screen to the right of the audiogram; thereby, indicating that the
maximum dB HL for the extended range has been reached. If the dB HL 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 symbol on the audiogram during
testing. The extended range remains selected until either the intensity level for that particular
frequency (e.g., 1000 Hz) is brought down 5 positions below the maximum dB HL value (e.g.,
65 dB HL for 1000 Hz) or the frequency is changed. To save the threshold value per frequency,
press the M+ button. Note that the appropriate symbol (0 for right ear and X for left ear) for the
ear under test is positioned at the correct location on the audiogram. If no response (NR) was
detectable over the intensity range available, an arrow is attached to the 0 or X symbol on the
audiogram. It is possible to repeat a threshold check for any frequency by returning to that
frequency by way of the < and > Hz buttons. In this instance, the last threshold obtained and
saved with M+ button becomes the value saved in memory and is the value printed out on the
audiometric test results.
To present each test tone to the selected test ear, press the Present bar. A speaker symbol with
an arrow pointing from it appears on the screen between the audiogram and the dB/ Hz values
for as long as the Present bar is depressed.
NOTE: Although the printout will combine the right and left ear test results on the same
audiogram or table, the screen can display only the results from one ear at a time. Therefore, if
an ear pushbutton (R or L) is selected while you are still testing a particular ear, the screen will
change to a new audiogram. Once this happens, it is not possible to return to the incomplete
audiogram to complete the test sequence.
Frequency Intensity Range
125 Hz -10 to 50 dB HL
250 Hz -10 to 70 dB HL
500 to 6000 Hz -10 to 90 dB HL
8000 Hz -10 to 70 dB HL