Figure 3-4: 2212 Z-Axis Block Diagram - Tektronix 2212 Service Manual

Magnifier 1 OX
Trace Intensity
Readout Intensity
EXTZ
BLANK
Chopped Blank
(CHPBLANK)
STORE
_'XY
_o
Beamfind_0
(BFND_0)
EXT-Z Enable
(EXTZEN_0)
2212
Service
Manual
-
-
-
-
-
-
-
-
Horizontal System and Z-Axis Circuit
I
[:>
-"-
12 kV
-
-
Z-Azis
Ampl.
K'--
-
.-Trace Rot.
DC
-
CRT
-
-
Astiqm.
C>
- Restorer
-
Adjust-
-
-
Focus ments
l
-
·1
rr=1
Grid
j
-
Bias
-"--
100 VAC 2kV Heater
From Power Supply
Jl
-
Switch
Logic
>---
Figure 3-4: 2212 Z-Axis Block Diagram
The Z-axis signal from the input circuit is passed on to the Z-axis amplifier,
Q1210, Q1211, Q1212. The output of the amplifier is combined with the grid
bias voltage from R1234 in the DC restorer circuit. The voltage difference be-
tween grid bias and the Z-axis are level shifted to the cathode voltage. The
voltage between grid bias and Z-axis equals the voltage between CRT cathode
and control grid. The CRT grid is more negative than the cathode. This controls
the beam current through the CRT. Trace rotation, geometry and astigmatism are
factory adjusted.
3- 17