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Theory of Operation—2 213 Service
circuit functions to either produce no delay, display an
intensified zone on the Sweep display, or to delay the
start o f the Sweep fo r a period o f time after receiving a
triggering signal. The delay time is established by two
front-panel controls: the D ELAY TIM E switch which sets
the basic delay, and the M ULTIPLIER potentiometer
which increases the basic delay by a factor o f up to twenty
times. O utput signals from the Delay circuit are applied to
a logic gate circuit to control both the tim ing o f the start
o f the sweep and the Z-Axis drive.
The Z-Axis drive from the Sweep Logic circuit is applied
to the Z-Axis amplifier. The output signal from the Z-Axis
Am plifier circuit sets the crt intensity. A Chop Blanking
signal from the Chop Oscillator circuit blanks the crt
display during the transition between the vertical channels
when using CHOP V E R TIC A L MODE.
The DC Restoration circuit raises the o utput level o f the
Z-Axis A m plifier to allow it to be coupled to the crt
control grid. Direct coupling is not employed due to the
amplitude o f the voltage levels applied to the crt elements.
The Swp Duty signal from the Sweep Logic circuit is
applied to the A uto Intensity circuit. The A uto Intensity
circu it provides partial control o f the intensity o f the
display when switching between different positions o f the
SEC/DIV switch.
The Power Supply provides all the necessary operating
voltages fo r the instrument circuitry. Operating potentials
are obtained from a circu it composed o f the Preregulator,
Inverter and Transformer, and Rectifiers and Filters. The
Preregulator produces approximately +45 V from the ac-
power-input source which is used to drive the 20-kHz
Inverter stage. The Transformer secondary windings provide
various ac levels that are rectified and filtered to produce
the operating voltages. A High-voltage M ultiplier circuit
produces the accelerating, focus, and cathode potentials
required by the crt.
A front-panel PROBE ADJUST output is provided fo r
use in adjusting probe compensation. The voltage at the
PROBE ADJUST connector is a negative-going square wave
that has a peak-to-peak amplitude o f approximately 0.5 V
and a repetition rate o f approximately 1 kHz.
DETAILED CIRCUIT DESCRIPTION
VERTICAL ATTENUATORS
Both the Channel 1 and Channel 2 Attenuator circuits,
shown in Diagram 1, are identical in operation. In the
follow ing discussion, only the Channel 1 Attenuator circuit
is described. The matching components in the Channel 2
Attenuator circuit perform the same function.
The Attenuator circuit (see Figure 3-2) provides control
o f input coupling, vertical deflection factor, and variable
volts-per-division balance. Input signals fo r crt vertical
deflection may be connected to either or both the CH 1 OR
X and the CH 2 OR Y input connectors. In the X-Y Mode
o f operation, the signal applied to the CH 1 OR X con
nector provides horizontal (X-Axis) deflection fo r the
display, and the signal applied to the CH 2 OR Y connect or
provides the vertical (Y-Axis) deflection fo r the display.
Input Coupling
The signal applied to the CH 1 OR X input connector
can be ac-coupled, dc-coupled, or internally disconnected
from the input of the High-Z Input Attenuator circuit.
Signals applied to the CH 1 input connector are routed
through resistor R101 to Input Coupling switch S101.
When S I01 is set fo r dc coupling, the CH 1 signal is applied
directly to the input o f the High-Z Attenuator stage. When
ac-coupled, the input signal passes through R100 and
dc-blocking capacitor C l02. The blocking capacitor
prevents the dc component o f the input signal from being
applied to the Attenuator circuit. When S101 is set to
GND, the direct signal path is opened and the input o f the
attenuator is connected to ground. This provides a ground
reference w ith o u t the need to disconnect the applied signal
from the input connector. The coupling capacitor is
allowed to precharge through R102, a high-resistance com
ponent, which is connected across Input Coupling switch
S101 in the GND position.
High-Z Attenuator
The first section o f attenuator switch S105A directs
the input signal to one o f three paths: directly through
R103 (no attenuation); through a 10X attenuator con
sisting o f C l05, C l07, R105, R106, R107, and R108;
or through a 100X attenuator consisting o f C l 11, C l 12,
R110, R 111, R112, R114, and R115. Medium-frequency
normalization o f the input capacitance is accomplished by
3 -4
Содержание 2213
Страница 1: ...Ttektronix 2213 OSCILLOSCOPE SERVICE IN S T R U C T IO N M A N U A L ...
Страница 9: ...2213 Service 3827 01 viii The 2213 Oscilloscope ...
Страница 30: ...Theory of Operation 2213 Service 3 3 Figure 3 1 Basic block diagram of the 2213 Oscilloscope ...
Страница 67: ...Adjustment Procedure 2213 Service 5 2 ...
Страница 139: ...Figure 9 4 2213 block diagram S105 ...
Страница 140: ...a o m 7 x C O o z CHANNEL SWITCH AND VERTICAL OUTPUT ...
Страница 141: ...2213 Service ...
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Страница 146: ...2213 3827 20 R V FB 4982 C 4 ...
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