Operating Instruction
ERO•SCAN
®
Screening and Diagnostic Version
operating_instructions_8106556-6_EROSCAN_e_15a
47
8106556-5 02/15
19.2
Selecting the Averaging Time
The Averaging Time can be changed to one of five settings. The
Averaging Time will have a significant impact on the time
required to perform the test and on the signal-to-noise ratio
(SNR). A 4 second average would produce a test in about 4
seconds. A 32 second average would produce a test in about
32 seconds. This timing does not reflect the Probe Check
process. The possible settings for the Averaging Time are as
follows:
4, 8, 16, 32 or 64 seconds.
The instrument will automatically stop the test when the pass
criterion is met prior to the averaging time. Press the
CHANGE
keys to select an option and the
NEXT key to
exit (Display 34).
19.3
Setting the PASS SNR Level
In order to provide a PASS/REFER determination for each test,
the PASS SNR must be set. This number refers to the number of
decibels that the TEOAE signal must be above the noise to be
considered a PASS at that frequency. The limits for the PASS
SNR are 3 dB to 10 dB. Pressing the
LEFT or RIGHT
arrow
keys will increase or decrease the requirement. This requirement
is used in combination with the number of frequencies
(discussed below) to determine an overall PASS/REFER for each
test.
Press the
CHANGE
keys to select an option and the
NEXT
key to exit (Display 35).
Display 34
Display 35
Summary of Contents for ERO SCAN
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