NF WF1945B, Инструкция по эксплуатации

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4.1 Burst oscillation
4-4
WF1945B
②
Press the
ENTER
key.
Turn the
MODIFY
dial to produce the following display (ON flashes).
ＯＮ ０．００ ％
ＢＵＲＳＴ： ＴＹＰＥ ＭＡＲＫ ＳＰＡＣＥ ＳＴＯＰ―ＬＥＶＥＬ
③
Press the key, then set the stop level with the keypad or
MODIFY
dial.
In this example, the setting is 25 %.
The stop level is the percentage with respect to the maximum positive (+100 %) and negative
(-100 %) amplitude.
④
After setting, press the
EXIT
key to release the setting mode.
This completes burst oscillation (type: burst) setting.
Other:
• If the frequency exceeds 5 MHz, mark cycles and space cycles may be unpredictable.
If the cycles are undefined, the start phase may be shifted by half a cycle even though the frequency is
set to less than 5 MHz. If such a shift occurs, set the continuous oscillation and then the burst
oscillation.
• Stop level off: Oscillation stops at the phase (set by
ENTRY
→
PHASE
) setting (mark cycles more
than 1.0 and mark + space cycles are integers).
Waveform example of oscillation start phase:-90
°
, mark waves:2, space waves:1
*Also, by setting an amplitude (Vp-p) 1/2 DC
offset or the low level to 0 V, a unipolar
waveform can be obtained.
“5.1 Convenient Settings (
■
Amplitude
and DC offset setting by high and low level)”,
cf.
• Burst oscillation setting items (BURST menu)
TYPE: BURST
MARK (oscillation cycle) [cycle]
SPACE (cycle when oscillation stops) [cycle]
STOP-LEVEL [OFF, ON[%]]
PHASE (phase when oscillation starts) [deg] * ENTRY menu
Oscillate 2 waves Stop 1 wave
Oscillation start
Start phase: -90
°