Tektronix 323, Instruction Manual

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Calibration— Type 323
d. CHECK— Output frequency of generator must be 2.75
megahertz or higher.
e. Disconnect all test equipment.
30. Check AC-Coupled Lower Vertical
Bandwidth Limit
a. Connect the low-frequency constant-amplitude gen­
erator to the VERT INPUT connector through the 42-inch 50-
ohm BNC cable and the 50-ohm BNC termination.
b. Change the following control settings:
INPUT AC
X 10 VERT GAIN Pushed in
TIME/DIV .5 s
c. Set the low-frequency generator for a four-division
display, centered about the center horizontal line at a ref­
erence frequency of one kilohertz.
d. Without changing the output amplitude, reduce the
output frequency of the generator to two hertz.
e. CHECK— CRT display 2.8 divisions, or greater, in am­
plitude (not more than —3 dB).
f. Disconnect all test equipment.
31. Adjust Magnified Registration O
a. Change the following control settings:
VOLTS/DIV .5
INPUT DC
TIME/DIV 1 ms
b. Connect the time-mark generator to the VERT INPUT
connector through a 42-inch 50-ohm BNC cable and a 50-
ohm BNC termination.
c. Set the time-mark generator for five-millisecond mark­
ers.
d. Set the TRIGGER control for a stable display in the
variable positive-slope area.
e. Position the middle marker (three markers on sweep)
to the center vertical line (see Fig. 6-14A).
f. Pull the 10X HORIZ MAG switch out (Note: to pre­
vent changing knob position, the X 1 0 HORIZ MAG switch
can be actuated using the horizontal POSITION control
bracket behind the front panel).
g. CHECK—Middle marker should be within one division
of the center vertical line (see Fig. 6-14B).
Fig. 6 -1 4 . Typical CRT displa ys show ing correct m a g n ifie d re gistra­
tio n ; (A ) X l O HORIZ M A G switch pushed in, (B) X l O HORIZ
M A G switch pu lle d out. (C ) Location o f m a g n ifie r re gistratio n a d ­
justm ent (M a in b o a rd ).
h. ADJUST— Swp Mag Regis adjustment, R439 (see Fig.
6-14C), to position the middle marker to the center vertical
line.
i. INTERACTION—Check step 35.
6-19