Maintenance
27
calibration (the
Seal control
mode) make sure that two similar traces of stimulus
spectrum from the first and second telephones appear on the screen (Fig. 14).
Fig. 14. Frequency response calibration
When the test is over, the result should be REFER. There must be no emission for all
frequencies (Fig. 15).
Fig. 15. Result of DPAOE check in a test cavity
When the test is over, close it using the
Exam|Close
menu command. When the
Save
changes?
message box appears, press
No
.