4.2 Sweep
4-38 WF1946B
• Step number derivation (when oscillation mode of both channels is sweep or modulation. Other
times, see previous page.)
First, determine the reference and secondary channels. The reference channel is that with the shorter
sweep time or modulation period and is defined by the following method. The reverse is used for the
secondary channel. The modulation period is determined by the following formulae.
When the modulation waveform is SIN,
or ,
the modulation period = 1 ÷ (modulation frequency × 2)
When the modulation waveform is
or ,
the modulation period = 1 ÷ (modulation frequency)
a. Reference channel step number
(1) Sweep type is frequency
① Sweep time: 25 ms and less
Step no. = sweep time (s) × 5000 (round down, even number if more than 1.6 ms *2)
② Sweep time: more than 25 ms, but 31.25 ms and less
Step no. = 124 (fixed)
③ Sweep time: more than 31.25 ms
Step no. = sweep time (s) × 4000
(2) Sweep type other than frequency
① Sweep time: 50 ms and less
Step no. = sweep time (s) × 5000 (round down, even number if more than 1.6 ms *2)
② Sweep time: more than 50 ms, but 62.5 ms and less
Step no. = 250 (fixed)
③ Sweep time: more than 62.5 ms
Step no. = sweep time (s) × 4000
(3) Sweep type modulation
① Modulation period: 25 ms and less
Step no. = sweep time (s) × 5000
(rounded off, if modulation waveform is
or , even number *2, also integer multiple of 4.
If other modulation waveform, even number if more than 1.6 ms *2.)
② Modulation period: more than 25 ms, but 31.25 ms and less
Step no. = 124 (fixed)
③ Modulation period: more than 31.25 ms
Step no. = sweep time (s) × 4000
(rounded off, if modulation waveform is step, even number)
*2: If rounded up/off results are odd, -1.
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