Welch Allyn OAE Hearing Screener - User Manual - Manual (Page 45)

Understand printed results
DPOE printout
The following information is provided for each test:
•
The time and date of the test, based on the setting of the internal clock; if the clock
is set correctly, this time and date will be correct
• The test number (if operating in SAVE 250 mode)
• The protocol selected (for example, DP 2S)
• The averaging time used for this test (for example, 2 sec avg)
• Instrument/Probe serial number (SN)
• The software version number (for example, V101.01)
• The ear selected (Right or Left)
• A PASS/REFER indication
• The f2 frequency in kHz (for example, 2.0, 3,0, 4.0, 5.0)
• The NF in dB SPL
• The emission level (DP) intime dB SPL
• The SNR—DP level minus the NF—in dB
Rounding results
The SNR and single PASS criterion are calculated from the full internal precision of the
screener and not from the rounded values shown in the printout for the emission (DP)
and NF estimates.
This approach is used to preserve the full precision of the test results but can result in
some apparent errors in the printout due to the effects of rounding. Assume that the
actual values at a given frequency were DP = 5.5 dB and NF = -0.4 dB, which results in a
SNR = 5.9 dB. The printout values are rounded up to the nearest integer and are shown
as DP = 6, NF = 0, and SNR = 6. This can result in what appears to be an error, based on
the PASS criterion. If the PASS criterion is 6 dB while the actual SNR is 5.9, the printed
value will be 6 but the frequency will not be judged as a PASS with a “P” printed.
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