Tektronix 323, Instruction Manual

Page: 101 / 170

Calibration— Type 3 2 3
16. Adjust Limit Centering O
a. Set the VOLTS/DIV switch to 5 DIV CAL
b. Position the bottom of the display to the first grati­
cule line below the center horizontal line.
c. Reduce the display to exactly two divisions with the
VARIABLE VOLTS/DIV control.
d. Position the top of the display to the top horizontal
line of the graticule. Note the compression (reduction in
amplitude) of the display.
e. Position the bottom of the display to the bottom hori­
zontal line of the graticule. Again note the compression of
the display.
f. Return the display to the position which produces the
most compression of the display.
g. ADJUST— Limit Centering adjustment, R66 (see Fig.
6-7B), for maximum display amplitude (least compression).
Compression or expansion should not exceed 0.1 division.
17. Adjust Vertical X 1 Gain O
a. Change the following control settings:
VOLTS/DIV .01
VARIABLE VOLTS/DIV CAL
b. Connect the standard amplitude calibrator (067-0502-00)
output connector to the VERT INPUT connector with the 42-
inch BNC cable.
c. Set the standard amplitude calibrator for a 50-milli­
volt square-wave output.
d. Center the display about the center horizontal line
with the vertical POSITION control.
e. CHECK— CRT display for five divisions of deflection.
f. ADJUST—VERT X I GAIN adjustment, R69 (see Fig.
6-7B), for exactly five divisions of deflection.
18. Adjust Vertical X lO Gain O
a. Set the standard amplitude calibrator for a five-milli­
volt square-wave output.
b. Pull the X lO VERT GAIN switch.
c. Center the display about the center horizontal line
with the vertical POSITION control.
d. CHECK— CRT display for five divisions of deflection.
e. ADJUST— VERT X lO GAIN adjustment, R46 (see Fig.
6-7B), for exactly five divisions of deflection.
19. Check Vertical Deflection Accuracy
a. Push the X lO VERT GAIN switch in.
b. CHECK— Using the VOLTS/DIV switch and standard
amplitude calibrator settings given in Table 6-2, check ver­
tical deflection within 3% in each position of the VOLTS/DIV
switch.
TABLE 6 -2
Vertical Deflection Accuracy
VOLTS/DIV
switch
setting
Standard
amplitude
calibrator
output
Vertical
deflection
in
divisions
Maximum
error for
± 3 %
accuracy
(divisions)
.01 50 millivolts 5 Previously set
exactly in
step 17
.02 0.1 volt 5 ±0.15
.05 0.2 volt 4
±0.12
.1 0.5 volt 5 ±0.15
.2 1 volt 5 ±0.15
.5 2 volts
4 ±0.12
1 5 volts
5 ±0.15
2 10 volts
5 ±0.15
5
20 volts
4 ±0.12
10 50 volts
5 ±0 .1 5
20 100 volts
5 ±0.15
2 0 . Check V ariable Volts/Division Control
Range
a. Set the standard amplitude calibrator for a 50-milli­
volt square-wave output.
b. Change the following control settings:
VOLTS/DIV .01
INPUT AC
c. Center the display about the center horizontal line
with the vertical POSITION control.
d. CHECK— Rotate the VARIABLE VOLTS/DIV control
fully counterclockwise. Display must be reduced to two
divisions or less (indicates adequate range for continuously
variable deflection factor between the calibrated steps).
21. Check Input Coupling Switch Operation
a. Set the VARIABLE VOLTS/DIV control to CAL.
b. Set the standard amplitude calibrator for a 20-milli­
volt square-wave output.
c. Center the display about the center horizontal line
with the vertical POSITION control.
6-12