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9
Description o f the block diagram
Channels A and B each consist of an input circuit in
which the "AC-DC" switch and the step attenuator are
included., and an amplifier which contains the V/cm
continuous attenuator, the SHIFT control and the
polarity switch, see Fig. 1.
The switching of these channels occurs at the output of
these amplifiers, after which the combined signal is
applied to an output amplifier.
The switching circuit consists of a blocking oscillator
A
0
CHECK
V/cm
A C
ZEORO
~DC
20 kHz
r -~
I...i
i
500 kHz ~T'
MODE
A •
t
--
B •
CHOPPED •
ALTERNATE •
ADDED •
EXT.-CHOPPED
O
B
OAC~
DC
r --
b
DCBAL
Z MOD
1
PM 3330
BLOCKING
OSCILLATOR
CATH
FOLL.
AMPLIFIER
and a bi-stable multivibrator, which supplies the
switching voltage. The trigger voltage for the basic
oscilloscope is taken from one of the channels via a
selector switch.
A trigger amplifier amplifies this voltage, so that the
trigger- signal and the Y-input signal have identical
amplitudes.
In position "ADDED" of the "MODE" selector, the
trigger signal is directly taken from the output ampli-
fier.
NORMAL
INVERT
V'cm
CONT
I
'
~ I SHIFT
b
GAIN
TRIGG
r
TRIGGER
AMPLIFIER
MULTIVIBRATOR
1
ELECTR.
SW TCH
DCBAL
4
L_-
CHECK
ZERO
V
/
/CSR \
Fig. 1. Block diagram
CATH
FOLL.
GAIN
V/cm
CONT
I
SHIFT
AMPLIFIER
NORMAL
INVERT
PEM 2633
I
FINAL
—~
I
Y-AMPL.
I
—~1
I
POS. I
ADDED]
TRIGGER
O
I PRE-AMPL.
STAGE
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