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OD-514B, OD-515B & OD-545B INSTRUCTION MANUAL
4. Set TIME/DIV [18] so that the appropriate number of signal cycles appears on
screen. For some measurements the appropriate number of cycles is only two
or 3 cycles; for other measurements the appropriate number of cycles is 50-100
(displayed as a band). If necessary, adjust Trigger LEVEL control [30] for a
stable display of the signal.
5. If the frequency of signal is so high that even in the 0.1
TIME/DIV [18] selector appears too many cycles on screen, push the x10 MAG
key [33]. This increases the effective sweep speed 10 times, so 0.2
position now corresponds to 20 ns/DIV, 0.5
50 ns/DIV, etc.
6. If the frequency of the signal is very low or its zero (DC signal), so the AC
coupling attenuates or distorts the signal, set AC/GND/DC [11] or [15] selector
to DC.
4.3.2 Dual-Channel Operation
Dual-Channel operation is the main operation mode of the OD-514B, OD-515B
and OD-545B.
Set VERT MODE [39] selector to the DUAL position so the channel 2 signal is
displayed too.
The operation is identical to the one described in the section 4.3.1 with the
following exceptions:
When in dual-channel operation DUAL (or ADD), set Trigger SOURCE switch [26]
according to:
-
If both channels are displaying signals of the same frequency, set the Trigger
SOURCE switch [26] to the channel with the steepest-slope waveform.
-
If the signals are different but they are harmonically related, trigger from the
channel carrying the lowest frequency.
-
If the signals do not have the same frequency, engaging TRIG.ALT [24] both
signals will be synchronised.
Bear in mind too that if the channel used for triggering is disconnected, the image
will not be stable.
November 2000
P
s position
Figure 7.-
P
s position of the
P
s/DIV
corresponds to
Page 21
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