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input circuit for the external trigger voltage is d.c. coupled acid can be
triggered with very low frequencies or with a direct voltage. For the rest
proceed as for internal triggering.
4. Time-base internally triggered with the mains frequency
Set the switch marked "TRIGG." at the position "-~ 50 Hz" or "-50 Hz".
Then proceed as described in section 2 "Time-base internally triggered".
E. DETERMINING THE TIME
The sweep time per cm can be determined from the position of the
knob "M/ ".
When the picture is magnified 5 x in horizontal direction (see section I
"Horizontal magnification") the sweep time per cm is 5 x smaller than is
indicated by these knobs.
F. VOLTAGE MEASUREMENT
When the continuous control "Y AMPL." is in the position "CAL."
(turned fully clockwise), the value of the voltage connected to the socket
"Y AMPL." can be determined immediately from the picture height and
the position of the step attenuator "Y AMPL."
Switch "NORMAL-2 mV" enables the sensitivity of the amplifier to be
increased when the attenuator is set to maximum sensitivity. Thus with
switch "Y AMPL." at "10 mV/cm" and switch "NORMAL-2 mV" at
" 2 mV" the sensitivity is 2 mV/cm.
For calibration at the vertical sensitivity see chapter IV. K "Use of the
calibration voltage".
G. HORIZONTAL DEFLECTION WITH AN EXTERNAL VOLTAGE
The time-base generator is switched off when the switch "X DEFL."
is at the position "EXT.". Both the vertical and the horizontal deflection
can then take place with an external voltage, so that, for example,
frequency measurements can be carried out with the aid of Lissajous
figures.
The external voltage for horizontal deflection is connected to one of the
sockets "X AMPL." ("10 V/cm" or "1 V/cm"). The horizontal amplitude
can be varied with the continuous control "X DEFL.".
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