Performance Check/Calibration—Type 422 AC-DC
g. Change the following control settings:
CH 2 Input Coupling DC
Vertical Mode ALG ADD
INVERT Pulled out
h. CHECK—CRT display for straight line.
PERFORMANCE CHECK ONLY
Front-panel adjustment; can be adjusted as part of
performance check.
i. ADJUST—Channel 2 GAIN adjustment R180 (see Fig.
5-15) for straight line.
17. Check Added Mode Operation
a. Push in the INVERT switch.
b. Set the standard amplitude calibrator for a 0.12-volt
square-wave output.
c. CHECK—CRT display for four divisions ±0.12
division of amplitude.
18. Check Channel 1 and 2 Deflection Accuracy
a. Change the following control settings:
CH 2 Input Coupling GND
Vertical Mode CH 1
b. CHECK—Using the Channel 1 VOLTS/DIV switch
and standard amplitude calibrator settings given in Table
5-2, check vertical deflection within 3% at each position of
the Channel 1 VOLTS/DIV switch.
TABLE 5-2
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 ±0.15
.02 0.1 volt
5 ±0.15
.05
Checked and adjusted in step
2
.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
2
20 volts 4 ±0.12
10
50 volts 5
±0.15
20
100 volts 5 ±0.15
c. Change the following control settings:
CH 1 Input Coupling GND
CH 2 Input Coupling DC
Vertical Mode CH 2
d. CHECK—Using the Channel 2 VOLTS/DIV switch
and standard amplitude calibrator settings given in Table
5-2, check vertical deflection within 3% at each position of
the Channel 2 VOLTS/DIV switch.
19. Check Channel 2 X10 Gain
a. Change the following control settings:
CH 1 and 2 VOLTS/DIV .05
X10 GAIN AC Pulled out
b. Set the standard amplitude calibrator for a 20-
millivolt square-wave output.
c. CHECK—CRT display for four divisions +0.16 divi
sion of deflection (within 4%).
d. Push in the X10 GAIN AC switch.
20. Check Channel 1 and 2 Variable Volts/
Division Control Range
a. Set the standard amplitude calibrator for a 0.2-volt
square-wave output.
b. CHECK-Turn the Channel 2 VARIABLE VOLTS/
DIV control fully counterclockwise. Display should be
reduced to 1.6 divisions or less (indicates adequate range
for continuously variable deflection factor between the cali
brated steps). Channel 2 UNCAL light must be on when
Channel 2 VARIABLE control is not in CAL position.
c. Change the following control settings:
CH 1 Input Coupling DC
Vertical Mode CH 1
d. CHECK-Turn the Channel 1 VARIABLE VOLTS/
DIV control fully counterclockwise. Display should be
reduced to 1.6 divisions or less (indicates adequate range
for continuously variable deflection factor between the cali
brated steps). Channel 1 UNCAL light must be on when
Channel 1 VARIABLE control is not in CAL position.
21. Check Low-Frequency Vertical Linearity
a. Set the standard amplitude calibrator for a 0.2-volt
square-wave output.
b. Position the display to the center of the graticule
with the Channel 1 POSITION control.
c. Set the Channel 1 VARIABLE VOLTS/DIV control
for exactly two divisions of deflection (see Fig. 5-16B).
d. Position the top of the display to the top horizontal
line of the graticule.
5-19
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