Welch Allyn TM 262 Auto Tymp - User Manual - Manual (Page 41)

Revised 4/11/08 3-7
Operation
Earphone Care (Models with Audiometry
only)
The earphone and cords provided with the instrument versions 3 and 4 should last a long time
with proper care. To clean the earphones and cords, use only a dry cloth or tissue. Moisture
should not be allowed anywhere near the earphone itself as this will damage the diaphragm and
grill cloth, requiring its replacement.
With extended use, earphone cords tend to fray internally at the connectors i.e., between the
cord and the instrument’s connector, and between the cord and the earphone connector. This
fraying will ultimately either decrease the signal level or cause the signal to be intermittent. To
check for this,
1. Position the test headset over your ears and select a frequency (e.g., 1000 Hz) at 35 dB
HL.
2. Select the right earphone and press the Present bar.
3. While the present bar is depressed, flex the earphone cord next to the connector at both
ends.
4. Listen for an intermittent signal, an abrupt change in signal intensity level or a scratchy
sound superimposed over the selected frequency that coincides with the flexing of the
cord. The presence of any of these conditions indicates that the cord should be replaced.
5. Also, examine the earphone cord for cuts or tears in the covering shield and the earphone
cushion for signs of damage. If either problem is noticed, the earphone cord or cushion
should be replaced. Both parts are easily replaced without the need for recalibration.
However, if the earphone receives shock damage or is replaced for any reason, the
instrument will need to be recalibrated.
6. Repeat this same sequence with the left earphone.
Paper supply
To streamline each testing session, it is a good idea to check the amount of paper left inside the
printer compartment. Extra rolls of paper should be kept nearby.
NOTE: The number of tests per roll of paper will vary with the version Auto Tymp being
used and the type of tests being performed. See Printer Description in the Specification
chapter for approximations. Replacement paper can be purchased from your local Welch Allyn
Distributor or from the factory.