18
5. If the signal to be measured is too small, even
with a 5 mV/div setting, to be triggered cor-
rectly, pull out the VARIABLE knob (14). This
increases the range to 1:5, i.e. sets it to 1
mV/div. However, this reduces the bandwidth
to 7 MHz and measurement results may be
falsified by noise in the case of such small sig-
nals.
6. If there is only a dense frequency spectrum on
the screen with a 0.2 µs/div setting, especially
at high frequencies, pull out knob (21) in
order to expand the range to 1:10, this
expands 0.2 µs/div to 0.02 µs = 20 ns.
7. If the signal to be measured is a direct volt-
age or an extremely low-frequency alternating
voltage, it is best to set the coupling type
switch (10) or (11) to DC.
WARNING!
If the signal is an extremely low-level periodic
signal, it is crucial to make sure that it is not a
pulsating voltage, i.e. that it is not super-
imposed on an extremely high direct voltage
such as the ripple voltage of a loaded source of
direct voltage. It is crucial not to exceed the
maximum permitted input values.
(Re. 7.) In addition, the trigger MODE switch
(26) must be set to NORM if the mea-
suring signal is less than 25 Hz. If nec-
essary, trigger LEVEL (29) must be read-
justed.
2.2.5 Dual trace mode
The oscilloscope is designed for dual-trace op-
eration. The oscilloscope is generally operated in
this mode. The basic settings are identical to
those for single-trace mode but with the follow-
ing exceptions:
1. Set the vertical MODE switch (18) to the DUAL
position. In the case of frequencies equal to
or greater than 0.2 ms, ALT mode is selected
and in case of frequencies having a period of
less than 0.5 ms, CHOP mode is selected with-
out you having to operate any other switch.
2. If both the measuring signals are of the same
frequency, set the trigger SOURCE switch (27)
to the position for the channel that has a
waveform that resembles a stepped shape
such as a rectangular-pulse signal. In contrast,
if the measuring signals are of different
frequency, use the channel that has the lower
frequency as the trigger source (SOURCE). Do
not forget that when you disconnect the
measuring signal from the channel that you
are using as a trigger source, the display "runs
away".
Fig. 7 Using the TV-V and TV-H trigger switch
2.2.6 Optional trigger settings
Choose the triggering mode (trigger MODE =
(26)).
In the NORM manual mode, a trace is only
"painted" on the screen if the input signal
reaches a level that corresponds to that previously
set using the LEVEL knob (26). In the AUTO posi-
tion, automatic triggering is active, i.e. a trace is
always visible on the screen even when no input
signal is applied. The only disadvantage of auto-
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