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ABOUT DETECTION MODE
This instrument is a spectrum analyer which uses a digital storage system. The spectrum
analyzer makes level measurements in frequency steps obtained by dividing the frequency
span by the number of measurement data points (501). This method of measurement cannot
detect the signal peak level if the spectrum of a received signal is narrower than these
frequency steps.
To resolve this problem, this instrument usually operates in positive peak detection mode
and normal detection mode. In the positive peak detection mode, the highest level within the
frequency range between the sample points can be held and traced. In the normal detection
mode, both the positive peak and the negative peak can be traced.
Positive peak detection mode should be used for almost all measurements including normal
signal level measurement, pulsed noise analysis, and others. It is impossible to measure
the signal level accurately in sample detection mode or in negative peak detection mode.
Use of sample detection mode is restricted to random noise measurement, occupied
frequency bandwidth measurement for analog communication systems, and adjacent-
channel leakage power measurement, etc.
Measurement Item
• Normal signal ..................................................................................................POS PEAK
• Random noise ..................................................................................................SAMPLE
• Pulsed noise .....................................................................................................NORMAL (POSI-NEG)
• Occupied frequency bandwidth, adjacent-channel leakage power ..........SAMPLE
(for analog communication systems)
• Occupied frequency bandwidth, adjacent-channel leakage power ..........POS PEAK or SAMPLE
(for digital communication systems)
When a detection mode is specified as one of the measurement methods, make the
measurement in the specified detection mode.
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