NF wf1966, Instruction Manual

Page: 100 / 198

4.2 Sweep
4-38
WF1966
(4) Modulation type other than frequency
①
Modulation period: 50 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 more than 3.2 ms. If other modulation waveform, even number if more than 1.6 ms *2)
② Modulation period: more than 50 ms, but 62.5 ms and less
Step no. = 250 (fixed)
(248 if the modulated waveform is
or )
③ Modulation period: more than 62.5 ms
Step no. = modulation period (s)
×
4000
(rounded off, if modulation waveform is step, even number)
(5) Exceptions
① If the sweep type is changed after setting the sweep time, the step number remains the same.
For example, if the sweep type is changed from frequency to amplitude, the step number remains
as in item (1).
②
If the modulation type is set for frequency, then the modulation waveform is changed, the step
number remains the same. For example, if changed from frequency to amplitude modulation,
the step number remains as in item (3).
b. Secondary channel step number
Step no. = reference channel step no.
×
secondary channel sweep time (modulation period)
÷
reference channel sweep time (modulation period)
(If function is step, round up to even number *2, if other function, round off.)
*2: If rounded up/off results are odd, -1.
• Deriving step width
During linear sweep, step width = ―――――――
During logarithmic sweep, step width = log
10
-1
[log
10
―――
÷
(step no. -1)]
Step width during log sweep changes with step progression.
Marker output is synchronized with the sweep step. The shift between the marker value setting and
the actual value that changes marker output is equal to the
±
step width.
Span
Step number -1
stop
start