29–
16.5 OVER WRITE mode
1. Press to enter into the OVER WRITE mode, where traces are written one over another.
The number of sweeps is unlimited.
* “OVER WR” is displayed in the CALC area on the LCD screen.
(Refer to “4. Description of Display” for details)
* Only the last one trace is saved.
16.6 SPURIOUS FREE mode (2658 only)
1. By pushing it will become the SPURIOUS FREE mode which simply deletes
spurious characteristic at band 1+.
* "SPR." is displayed beside CALC in liquid crystal screen CALC area.
(Refer to “4. Description of Display” for details)
* The SPURIOUS characteristic at band 1+ is a spurious calculated by the following formula
for a input signal over 6.76GHz, in case of measurement at band 1+.
(Refer to “8. Frequency Span” for details)
Spurious characteristic at band 1+ [GHz] = (Input signal [GHz] +5.64GHz) /2
* SPURIOUS FREE mode
1. SPURIOUS FREE mode is the mode which simply deletes SPURIOUS characteristic
at band 1+.
2. SPURIOUS FREE mode has a special effect in measurement of a regular wave.
3. If SPURIOUS FREE mode is used in measurement of a signal with level change or frequency
change, the phenomenon will happen that an amplitude level falls.
* How to discriminate SPURIOUS characteristic at band 1+ in manual operation
The procedure for discriminating SPURIOUS characteristic at band 1+ is as follows.
1. Set to SPAN = 10MHz.
2. Set the frequency of SPECTRUM to be discriminated to the center frequency
of 2658.
3. Verify that SPECTRUM to be discriminated is at the center of a screen, and change
the main frequency by +1MHz.
4. Judge by measured trace data.
The same frequency as the frequency set up first. Measurement data.
F5
F6
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