Tektronix 7613 User Manual

Calibration—7613/R7613 Service
R1193
A (Astigmatism) /
Adjustm:
R1261
CRT Grid Bias
oa —
R1250
Focus Preset
R1181
Trace Rotation
Y (Y-Axis)
Z-Axis
t
Test Point
Readout Board
Remove
Fig. 2-2. Location of Display and Z Axis adjustments and test points.
4B. Check Z-Axis DC Levels
a. Set the test-oscilloscope for 10 V/division, DC input,
and connect its 10X probe to the 7613 (R7613) Z-Axis
test point (see Fig. 2-2) and probe ground lead to chassis
ground.
b. Set the time base plug-in in the 7613 (R7613) to
50 ms/division, not intensified, and the test-oscilloscope
time base to 1 sec/div.
c. Set the calibration fixture Position control to posi-
tion the trace vertically off screen, and set the INTENSITY
control fully clockwise.
d. CHECK—The test-oscilloscope display amplitude
should be at least 58 volts, note this reading.
e. Set the 7613 (R7613) time base plug-in to 0.1
second/division.
f. CHECK—Pulse amplitude deflection on the test-
oscilloscope should decrease to between 25 volts to 35 volts
less than the amplitude in step d.
g. Disconnect the test oscilloscope 10X probe from the
7613 (R7613) and reduce the INTENSITY setting to a
normal intensity. Position the trace within the graticule
area.
5. Adjust Astigmatism
a. Set the 7B53A for auto, internal triggering at a sweep
rate of one millisecond/division.
b. Set the mainframe standardizer calibration fixture
Test switch to Vert or Horiz Aux In.
c. Connect the 4 V Calibrator pin-jack to the Aux In
connector of the calibration fixure with the BNC to
pin-jack cable.
d. Set the calibration fixture Position control for a
centered display, and the Amplitude control for about two
divisions of vertical deflection.
e. CHECK—CRT display is well defined.
f. ADJUST—FOCUS control and A (astigmatism) ad-
justment R1193 (see Fig. 2-2) to obtain best display
definition.
g. Disconnect the cable.
6. Adjust Trace Rotation
a. Set the INTENSITY control to midrange.
b. Move the trace to the center horizontal line with the
mainframe standardizer Position control.
REV. JAN 1974 27
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English