Tektronix 7613 User Manual

Circuit Description—7613/R7613 Service
The output of the Oscillator stage is connected to the
base of 01070. This signal controls the conduction of
comparator 01070-01072. When the base of G1070 is
high, it is off and Q1072 is conducting. This produces a
positive output voltage at the Calibrator pin-jacks. When
the level at the base of Q1070 is switched low, 01070
conducts and Q1072 is reverse biased. Now, the voltage
level at the Calibrator pin-jacks drops to zero.
Output Voltage Divider. The collector current of Q1072
in the Output Amplifier stage is applied across the voltage
divider made up of resistors R1079 through R 1085. This
divider is designed to provide a low output resistance in the
40 mV and 0.4 V positions while providing accurate output
voltages. The output resistance at the 4 V pin-jack is about
450 ohms and at the 0.4 V and 40 mV pin-jacks is about 50
ohms.
CRT CIRCUIT
The CRT Circuit produces the high-voltage potentials
and provides the control circuits necessary for the opera-
tion of the cathode-ray tube (CRT). This circuit also
includes the Z-Axis Amplifier stage to set the intensity of
the CRT display and the Auto Focus amplifier to assure
R1139
. Auto Focus
Amplifier
Q1128
Q1110 Q17136
Q1118 Q1132
Q1134
Z-Axis Signal
from Readout
Circuit
Z-Axis Signal
from Z-Axis
Logic
— Focus Grid
™ 1 OC Restorer
»| Control-Grid
DC Restorer
4]
+15 VOLTS from High-Voltage
Low-Voltage
Power Supply Q1216, Q1218
T1226
High-Voltage
Oscillator Suppl
CR1226, C
CR1232
y
R1228
High
Voltage
Regulator
R1045
Focus
—1,475 kV
Fig. 3-21. CRT Circuit detailed block diagram.
3-24
REV. MAY 1974
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English