Audiotel International Limited 2-400-0001 ユーザーズマニュアル
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AUDIOTEL INTERNATIONAL MN400872 Issue 1 (08/04)
D
ETECT
IV User Manual
AUDIOTEL INTERNATIONAL MN400872 Issue 1 (08/04)
25
Analysing the harmonic returns from targets
When either the 2nd or 3rd harmonic indicator bars are selected on the IDENTIFY screen the
Analyse on-screen button is displayed.
When either the 2nd or 3rd harmonic indicator bars are selected on the IDENTIFY screen the
Analyse on-screen button is displayed.
Press the Analyse button to display the NLJD analyse screen.
The analyse screen shows the spectral response of the 2nd and 3rd harmonic returns from any
target detected.
target detected.
The 2nd harmonic should appear between the
red
vertical lines and
the 3rd harmonic should appear between the
green
vertical lines.
Also included on this screen is an offset cursor which allows the real frequency of any sidebands
returned on the harmonics to be measured.
returned on the harmonics to be measured.
The appearance of sidebands in the return signals may be caused by some active electronic
targets, the offset would be equal to internal clock frequencies within the target.
targets, the offset would be equal to internal clock frequencies within the target.
If a noisy return spectrum is noted this may be caused by some metal targets.