Tektronix 422 - Page 122

Performance Check/Calibration—Type 422 AC-DC
n. Without changing the output amplitude, set the
constant-amplitude generator output frequency to five
megahertz.
o. CHECK—Stable CRT display can be obtained with
the TRIGGERING Coupling switch set to AC, AC LF REJ
and DC (LEVEL control may be adjusted as necessary to
obtain a stable display).
p. Set the TRIGGERING Mode switch to NORM (pulled
out).
q. CHECK—Stable CRT display can be obtained with
the TRIGGERING Coupling switch set to AC, AC LF REJ
and DC (LEVEL control may be adjusted as necessary to
obtain a stable display).
r. Set the Channel 1 VOLTS/DIV switch to .1.
s. Set the constant-amplitude generator for a six-division
display (0.6 volt) at its reference frequency (50 kilohertz).
t. Without changing the output amplitude, set the
constant-amplitude generator to 15 megahertz.
u. Pull the X I0 MAG switch
v. CHECK—Stable CRT display can be obtained with
the TRIGGERING Coupling switch set to AC, AC LF REJ
and DC (LEVEL control may be adjusted as necessary to
obtain a stable display).
w. Set the TRIGGERING Mode switch to AUTO
(pushed in).
x. CHECK—Stable CRT display can be obtained with
the TRIGGERING Coupling switch set to AC, AC LF REJ
and DC (LEVEL control may be adjusted as necessary to
obtain a stable display).
y. Disconnect all test equipment.
37. Check Low-Frequency Triggering Operation
a. Change the following control settings:
Ch 1 VOLTS/DIV .05
TIME/DIV 5 ms
X I0 MAG Pushed in
b. Connect the low-frequency constant-amplitude sine-
wave generator to the INPUT 1 connector through the BNC
to dual binding post adapter, 42-inch 50-ohm BNC cable,
50-ohm BNC termination and BNC T connector. Connect
the output of the BNC T connector to the TRIG IN con
nector with an 18-inch 50-ohm BNC cable.
c. Set the low-frequency generator for a 2.5-division dis
play (0.125 volt) at one kilohertz.
d. Without changing the output amplitude, set the
constant-amplitude generator output frequency to 50 hertz.
e. CHECK—Stable CRT display can be obtained with
TRIGGERING Coupling switch set to AC and DC (LEVEL
control may be adjusted as necessary to obtain a stable
display).
f. Set the TRIGGERING Mode switch to NORM (pulled
out).
g. CHECK—Stable CRT display can be obtained with
the TRIGGERING Coupling switch set to AC and DC
(LEVEL control may be adjusted as necessary to obtain a
stable display).
h. Set the TRIGGERING Source switch to CH 1 & 2.
i. Set the low-frequency generator for a 0.2-division dis
play at 50 hertz.
j. CHECK—Stable CRT display can be obtained with the
TRIGGERING Coupling switch set to AC and DC and the
TRIGGERING Source switch set to CH 1 and CH 1 & 2
(LEVEL control may be adjusted as necessary to obtain a
stable display).
k. Set the TRIGGERING Mode switch to AUTO
(pushed in).
l. CHECK—Stable CRT display can be obtained with the
TRIGGERING Coupling switch set to AC and DC and the
TRIGGERING Source switch set to CH 1 and CH 1 & 2
(LEVEL control may be adjusted as necessary to obtain a
stable display).
38. Check Low-Frequency Reject Operation
a. Change the following control settings:
TRIGGERING Coupling AC LF REJ
TRIGGERING Mode NORM
TIME/DIV .1 ms
b. Set the low-frequency generator for a 0.2-division dis
play at 50 kilohertz.
c. CHECK—Stable CRT display can be obtained with
the TRIGGERING Source switch set to CH 1 & 2 (LEVEL
control may be adjusted as necessary to obtain a stable
display).
d. Set the low-frequency generator for a two-division
display at 50 kilohertz.
e. Without changing the output amplitude, set the low-
frequency generator to 50 hertz.
f. Set the TIME/DIV switch to 5 ms.
g. CHECK—Stable CRT display cannot be obtained at
any setting of the LEVEL control with the TRIGGERING
Source switch set to CH 1 and CH 1 & 2.
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