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OD-514B, OD-515B & OD-545B INSTRUCTION MANUAL
4.3.6 Single-sweep Operation
Except OD-514B
Non-repetitive signals and one-shot transient signals can hardly be observed on
the screen with the regular repetitive sweep operation. Such signals can be measured by
displaying them in the single-sweep mode on the screen and photographing them.
Measurement of non-repetitive signal:
1. Set the TRIGGER MODE [28] to the NORM state.
2. Apply the measured signal to the vertical input terminal and adjust the triggering
level (TRIGGER LEVEL [30]).
3. Set the TRIGGER MODE [28] to the SINGLE state (the three push-button
switches, AUTO, NORM and SINGLE are pushed out).
4. Press the SINGLE button. The sweep will run only for one cycle and the
measured signal will be displayed only once on the screen.
Measurement of single-shot signal:
1. Set the TRIGGER MODE [28] to the NORM state.
2. Apply the calibration output signal to the vertical input terminal, and adjust the
triggering level (TRIGGER LEVEL [30]) at a value corresponding to the
predicted amplitude of the measured signal.
3. Set the TRIGGER MODE [28] to the SINGLE state (the three push-button
switches, AUTO, NORM and SINGLE are pushed out). Apply the measured
signal instead of the calibration signal to the vertical input.
4. Depress the SINGLE button. The sweep circuit is now in the ready state and the
READY indicator lamp will be turned on.
5. As the one-shot signal occurs in the input circuit, the sweep runs only for one
cycle and the one-shot signal is displayed on the CRT screen. However, this
cannot be done when the dual-channel ALT mode is in operation. For the dual-
channel one-sweep operation, use the CHOP mode instead.
4.3.7 Sweep Magnification
When a certain part of the displayed waveform is needed to be expanded timewise,
a faster sweep speed may be used. However, if the required portion is apart from the
starting point of the sweep, the required portion may run off the CRT screen. In such a
case, push in the x10 MAG [33] button. When this has been done, the displayed waveform
will be expanded 10 times to the right and left with the centre of screen as the centre of
expansion.
The sweep time during the magnification operation is as follows:
When the sweep is magnified and the sweep speed is above 0.1 µs/DIV, the trace
may become darker. In such a case, the displayed waveform should be expanded in the B
sweep mode as explained in the subsequent paragraph.
November 2000
Value indicated by TIME/DIV switch / 10
Page 29
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