Speech Audiometry
The MA 42 supports speech audiometry. To conduct speech tests using
speech test material you can use a CD player, Wave files from SD memory
card, or a microphone.
Caution: If you are using a CD player powered by electrical current, the player
must meet electrical safety requirements, such as IEC 60601-1 or UL. This is
to avoid electrical shock to either the patient or you. If you are not sure if
your player meets these requirements it is safer to use battery power.
6.2.1 Input Calibration
The MA 42 must be calibrated to the particular speech test to ensure valid
test levels. That means every time you change the speech test CD you must
recalibrate the instrument.
To calibrate the CD speech input select CD with the signal selector key (11),
(15). Press the Monitor button (6) and then InCal (19) and the calibration
screen appears (see Input Calibration screen in Figure 10).
On every CD with speech test material you have a reference signal, such as a
reference tone or speech simulating noise. Play back the reference signal from
the CD. Use the left or right level control (1) and adjust the levels until the VU-
meter (21) shows all yellow and one green light.
If one or more red lights are on, reduce the level using the corresponding dials
(1).
To calibrate the microphone for live voice testing, select MIC with the Signal
selector key (11), (15). Press the Monitor button (6) and then InCal (19) and
the calibration screen appears. Use the left or right level control (1) and adjust
the levels until the VU-meter (21) shows all yellow and one green light.
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