Waveform Magnification With Delayed Sweep - Promax OD-514B Instruction Manual

4.3.8 Waveform Magnification with Delayed Sweep

OD-545B only.
With sweep magnification of the preceding paragraph, although the magnification
method is simple, the magnification ratio is limited to 10. With the delayed sweep method of
this paragraph, the sweep can be expanded for a wider range from several times to several
thousand times according to the ratio between A sweep time and B sweep time.
As the measured signal frequency increases, the A sweep range for the non-
expanded signal becomes higher whereas the available expansion ratio becomes smaller.
Furthermore, as the magnification ratio becomes larger, the trace intensity becomes lower
and the delay jitter increases. To cope with these situations, a continuously variable delay
circuit and a triggering delay circuit are incorporated into the oscilloscope.
1. Continuous variable delay
1. Set the HORIZ. DISPLAY MODE switch [38] to A and display the signal
waveform with the A sweep in the regular operation mode. Next, set the B
TIME/DIV switch [18] to a position several steps faster than that of the A
TIME/DIV switch.
2. Ensure the B TRIG'D button of the HORIZ. DISPLAY MODE switch is
disengaged,
3. Engage the HORIZ. DISPLAY MODE switch [38] to the A INTEN position. A
portion of the displayed waveform will be accentuated as shown in the following
figure, indicating the state ready for delayed sweep. The portion of the
accentuated brightness indicates the section corresponding to the B sweep time
(DELAYED SWEEP). This portion is expanded on the B sweep.
Page 30
OD-514B, OD-515B & OD-545B INSTRUCTION MANUAL
Figure 14.- x10 MAG mode
November 2000