Welch Allyn OAE Hearing Screener - User Manual - Manual (Page 8)

Welch Allyn OAE Hearing Screener Directions for Use 705353 Rev F 7
F1 - the lower of the two stimulus frequencies used in a DPOAE test.
F2/F1 ratio - the numeric relationship of the two stimulus frequencies to one
another. Most research has shown that an F2/F1 ratio of approximately 1.2
produces the most robust emissions.
Hz - Hertz; a unit of measurement of frequency; also known as cycles per
second.
LCD - liquid crystal display; refers to the message window on the upper
portion of the Welch Allyn OAE Hearing Screener front panel.
LED - light emitting diode; a light that illuminates to indicate a hardware
function. On the Welch Allyn OAE Hearing Screener, an illuminated green
LED at the bottom left of the front panel indicates that the AC adapter is
plugged in and AC power is flowing to the box.
L1 - level or intensity of F1; the lower of the stimulus frequencies expressed
in dB SPL.
L2 - level or intensity of F2; the higher of the stimulus frequencies expressed
in dB SPL.
NF - noise floor; refers to the average amplitude of the background noise
measured at frequencies surrounding the DP frequency during the DPOAE
test. This value is expressed in dB SPL.
RS232 - a cylindrical hardware connector with pins that must be aligned to
the corresponding holes in the connector to which it attaches the Welch Allyn
OAE Hearing Screener to a serial printer.
Serial connector - an external peripheral interface standard for
communication to a label printer.
USB connector
- An external peripheral interface standard for
communication between a computer and the Welch Allyn OAE Hearing
Screener box for updating the software in the Welch Allyn OAE Hearing
Screener, setting the time and date or to download data to the PC.