NF WF1945B, Instruction Manual

Page: 131 / 188

5.1 Convenient Settings
WF1945B
5-3
„
Squarewave duty setting (
ENTRY
→
DUTY
)
Operation to set the squarewave duty is described. The setting changes the width (%) of the pulse with
respect to the overall waveform ( portion indicated by arrows).
Select squarewave ( variable duty).
Operation:
① Press the
ENTRY
key, then the
DUTY
key to produce the following display.
ＤＵＴＹ ５０．００００ ％
１０００．０００００００Ｈｚ Ａ０．１０００Ｖｐ－ｐ／ＯＰＥＮ
② Set the duty with the keypad or
MODIFY
dial.
Other:
• The table indicates the effects on other parameters when the frequency, period, width or duty is
changed.
Change
↓
Frequency
(FREQ)
Period
(PERIOD)
Pulse width
(WIDTH)
Duty
(DUTY)
Frequency
(FREQ)
Changed Changed Unchanged
Period
(PERIOD)
Changed Unchanged Changed
Pulse width
(WIDTH)
Unchanged Unchanged Changed
Duty
(DUTY)
Unchanged Unchanged Changed
• Due to the oscillation period and duty relationship, the pulse can be lost when the actual pulse width is
less than 25 ns. An error message is displayed at this type of setting.
Also, jitter increases when the pulse width is less than 100 ns. A warning message is displayed at
this type of setting.
• The actual waveform duty resolution is [oscillation frequency]
÷
[approx. 40 MHz] (0.00001 % at
minimum). When the stop level is on, the minimum actual waveform duty resolution is
approximately 0.003 %.
• For other notes, see " ■ Waveform selection " in Section 3.3, "Basic operation."