Welch Allyn TM 262 Auto Tymp - User Manual - Manual (Page 76)

TM 262
5-10 Revised 4/11/08
Example: Reflex #1 Reflex [0] = “0”, “3”, “0”, “D” = Ox3OD = 781 decimal scaled X 256
= 781 /256 = 3.051 cm
3
5. Audiometry Threshold values are stored scaled by 2 in the sequence of 125 Hz, 250, 500,
750, 1000, 1500, 2000, 3000, 4000, 6000 and 8000 Hz.
Example: HL Threshold 125 Hz = “0”, “0”, “9”, “6” = 0x96 = 150 decimal scaled x 2 =
150/2 = 75 dB
6. The pressure at which a Tympanometry compliance value was measured at is not
contained in the data record but may be calculated.
At the start of each pressure sweep, the pressure sweep rate is 600 daPa/sec. If the
compliance begins to rapidly increase, the pressure sweep rate changes to 200 daPa/sec
and remains at that rate until the compliance rate of change has sufficiently slowed down
to allow the pressure sweep rate to return to 600 daPa/sec.
While the pressure sweep rate is 600 daPa/sec, a compliance data point is stored at every
12 daPa drop in pressure and at 200 daPa/sec a compliance data point is stored at every 3
daPa drop in pressure. The Slow Index and Fast Index values in the data record indicate
where the pressure sweep rate changes, if any occurred.
7. Reflex compliance values are stored in three groups: 1 Reflex Baseline Average value
which is the reference measurement performed before the stimulus is presented, 4 Reflex
compliance data points which are measured while the stimulus is presented and stored as
the relative compliance change form the Baseline Average value, and 4 to 6 Reflex
recovery compliance data points which are measured after the stimulus is turned off and
stored as the relative compliance change form the Baseline Average value.