5. OPERATING IN TEST MODE
In Test Mode, the Midimate 622 behaves similarly to a conventional
audiometer with dedicated controls, except for the Softkey functions.
This chapter will describe the operation of the instrument in both pure tone
and speech testing as well as describe the controls in detail.
5.1 FRONT PANEL CONTROL FUNCTIONS
In this section the function of each separate operator control is explained.
Please refer to the fold-out drawing of the front panel at the back of the
manual.
For the purposes of description, the operation functions may be divided into
four separate groups:
1. Controls for operating the instrument as a standard audiometer.
2. Controls for patient communication and monitoring.
3. Pushbuttons that together with the display perform the function of
conventional potentiometers.
4. Softkeys.
In addition, there are two conventional potentiometers on either side of the
rear panel for adjusting the level of the audible patient response signal and
for adjusting the contrast of the display.
5.1.1 OPERATING CONTROLS
Hearing Level
This rotary knob controls the stimulus intensity in 1 or 5 dB steps within the
permitted range at any given frequency. Turn to the left to decrease level and
to the right to increase level. Level may be read off the lower line in the center
of the display.
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This knob may also be used as a potentiometer control during sensitivity
adjustments of Input levels.
Potentiometer
When “Patient” is selected from the Select Function Menu, this knob displays
numerals and symbols for entering the patient's I.D. number.
Patient I.D.
Number Entry
Masking Level
This rotary knob controls the Masking level in 5 dB steps when masking is
selected. Turn to the left to decrease level and to the right to increase level.
Level may be read off on the right of the display.
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MIDIMATE 622 OPERATION MANUAL
5. Operating in Test Mode
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