Tektronix 7613 User Manual

Calibration—7613/R7613 Service
24. Check/Adjust Horizontal Amplifier Gain and
Low-Frequency Linearity
a. Install the 7A15A in the horizontal compartment and
the 7B53A in the vertical compartment. Set the 7A15A
Volts/Div switch to 0.2 volt/division. Connect a 0.4 volt
square wave CALIBRATOR signal to the 7A15A; adjust the
Position control to keep the display centered on the
graticule and adjust the Variable Volts/Div control if
needed for two division display.
b, Check—Position the two division display horizontally
and check for not more than 0.1 division compression or
expansion anywhere within the graticule area. Remove the
7A15A and install the mainframe standardizer calibration
fixture. Set the Test switch on the calibration fixture to
Vert or Horiz gain, and Rep Rate to 250 kHz.
c. Set the 7B53A for auto, external triggering at a sweep
rate of one millisecond/division.
d. Position the display so the first and ninth traces are
near the far left and right vertical lines of the graticule.
e, CHECK—Deflection between the second and eighth
traces is eight divisions +0.08 division.
Horizontal
Centering
Horizontal
R535,
Limit
R512 R525
Horizontal Horizontal
Gain Centering
Mt
Fig. 2-6. Location of Horizontal adjustments (Horizontal Amplifier
board (A) SNB020000-up; (B) Below SNBO20000.
f. ADJUST—Horizontal Gain adjustment R512 (see Fig.
2-6) for exactly eight divisions of deflection between the
second and eighth traces.
g. CHECK—With gain set exactly, all nine vertical traces
align with their respective graticule lines within 0.05
division.
h. INTERACTION—If R512 is adjusted, recheck steps
22 and 23.
i. Remove the calibration fixture and install the 7B53A
in the horizontal compartment.
25. Adjust High-Frequency Timing
a. Install the 7A15A in the left vertical compartment.
b. Connect the time-mark generator to the input con-
nector of the 7A15A with the 42-inch 50-ohm BNC cable
and the 50-ohm BNC termination.
c. Set the time-mark generator for one-millisecond
markers. Set the deflection factor of the 7A15A so the
markers are at least two divisions in amplitude.
d. Set the 7B53A for auto, internal triggering at a sweep
rate of one millisecond/division.
e. Position the first marker to the left vertical line of the
graticule.
f. Set the 7B53A Swp Cal adjustment for one marker
each major graticule division between the first and ninth
lines.
g. Set the time-mark generator for 10-nanosecond
markers.
h. Set the 7B53A for a sweep rate of 0.1 microsecond/
division with the X10 magnifier on; set the deflection factor
of the 7A15A as necessary so the markers are about two
divisions in amplitude for the rest of step 25.
i. CHECK—CRT display for one marker each division
over the center eight divisions.
j. ADJUST—For SN B070000-up—C588 for one marker
each division (For SN below BO70000, adjust C568 and
C588 for one marker each division while maintaining ap-
proximately equal capacitances.) Use low capacitance ad-
justment tool for all adjustments in this step.
k. Set the 7B53A for a sweep rate of 0.05 microsecond/
division with X10 magnifier on.
|. ADJUST—For SN BO70000-up—C566 and C586 for
one marker each two divisions while maintaining approxi-
mately equal capacitances. (For SN below 070000, readjust
C568 and C588 for best compromise between 5 nanosecond
and 10 nanosecond timing.)
m. Repeat parts j, k, and | to achieve the best com-
promise for 5 nanosecond and 10 nanosecond timing over
the center 8 horizontal divisions.
26. Check X-Y Phase Shift
a. Install the 7A15A plug-in units in the left vertical and
horizontal compartments.
2-14
REV.
MAY
1974
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English