otometrics Madsen ZODIAC 901, Руководство пользователя

Страница: 39 / 100

Setup Parameters Setup parameters available in Manual Tymp. Mode are:
Measuring Direction: positive/negative, pos., or neg.
Y -axis Scaling (Compliance): Auto, 0.3 ml, 0.6 ml, 0.9 ml, 1.5 ml,
3.0 ml, 4.5 ml.
Averaging: On/Off (not Version 2.
x )
Alt. Select The Alt. Select pushkey allows you to use the Smooth feature to opti-
mize the curves (see Fig.4.10 and refer to §4.1.35.1.2 for further details re
this function). Just press
Softkey 2 from the Alt. Select sub-menu.
4.1.2 AUTO SWEEP
Auto Sweep In this test, a sweep is automatically performed and a Compliance tym-
panogram generated when a volume is detected (until a volume is de-
tected, the green
Status lights on the front panel and probe will flash). In
effect, this enables you when testing children to initiate the test even
prior to inserting the probe into the patient’s ear.
Leak
Leak Detect On/Off
If there is a leak before the sweep starts, the Leak lights on the front
panel and probe will light yellow. Before proceeding, ensure that you
are using the right size eartip, and try pulling down the ear lobe while at
the same time rotating the eartip in the ear canal. Meanwhile the ana-
lyzer will continue to attempt a sweep until the pump reaches the end
position whereupon the Status lamp lights red until the pump is reset.
Then the instrument will continue the procedure automatically. If Leak
Detect has been disabled (Version 4.x only), the analyzer stops after one
sweep (see Setup, §5.2.1).
Version 3.x Only It is worth noting that in Version 3.x and later, a leak encountered after
the sweep begins provokes a beep and the Leak lights go yellow. If Gra-
dient and TW can be calculated on the basis of the interrupted sweep,
the test is halted and the relevant data displayed. If not, the analyzer will
repeat the test as described above.
Softkey 2 Press Tymp. and then Softkey 2 to access the screen shown in Fig.4.5.
Press Softkey 2 again (or the Start/Stop Button on the Probe) to start the
test.
Pump Pressure During the sweep, a scale at the top of the display indicates the current
pump position graphically, i.e., what proportion of the pump’s capacity
is used to obtain the static pressure used for the measurement. Both the
pressure range and the direction of the sweep are selectable under Meas-
urement Setup (see page 35). Pump speed is also selectable and includes
the function AFAP (As Fast As Possible—please refer to page 36 for fur-
ther details).
When the sweep is completed, the computed values for Ear Canal Vol-
ume (ECV), Middle Ear Pressure (MEP), Static Compliance at MEP (SC),
Gradient (Grad) and Tympanogram Width (TW) are shown on the left-
Operation Manual 33
GN Otometrics MANUAL MODE Chap. 4
ZODIAC 901 Middle-Ear Analyzer
TYMPANOMETRY
4.1