Performance Check/Calibration—Type 422 AC-DC
b. Connect the high-frequency constant-amplitude sine-
wave generator (Type 191) to the INPUT 2 connector
through the GR to BNC adapter, 18-inch 50-ohm BNC
cable and the 50-ohm BNC termination.
c. Set the constant-amplitude generator for a four-
division display, centered on the graticule, at its reference
frequency (50 kilohertz).
d. Without changing the output amplitude, increase the
output frequency of the constant-amplitude generator until
the display is reduced to 2.8 divisions (—3 dB point).
e. CHECK—Output frequency of generator must be 15
megahertz or higher.
f. Set the vertical Mode switch to CH 2.
g. Disconnect the BNC termination from the INPUT 1
connector and re-connect it to the INPUT 2 connector.
h. Set the constant-amplitude generator for a four divi
sion display, centered on the graticule, at its reference fre
quency (50 kilohertz).
i. Without changing the output amplitude, increase the
output frequency of the constant-amplitude generator until
the display is reduced to 2.8 divisions (—3 dB point).
j. CHECK—Output frequency of generator must be 15
megahertz or higher.
29. Check Channel 2 X I0 Gain Upper Vertical
Bandwidth
a. Set the Channel 2 Input Coupling switch to AC.
b. Pull the X10 GAIN AC switch.
c. Set the constant-amplitude generator for a four-
division display, centered on the graticule, at its reference
frequency (50 kilohertz).
d. Without changing the output amplitude, increase the
output frequency of the constant-amplitude generator until
the display is reduced to 2.8 divisions (—3 dB point).
e. CHECK—Output frequency of generator must be five
megahertz or higher.
30. Check Common-Mode Rejection Ratio
a. Connect the high-frequency sine-wave generator to
the INPUT 1 and 2 connectors through the GR to BNC
adapter, 18-inch 50-ohm BNC cable, 50-ohm BNC termina
tion and the dual-input coupler.
b. Push in the X10 GAIN AC switch.
c. Set the sine-wave generator for an eight-division dis
play at 50 kilohertz.
d. Change the following control settings:
Vertical Mode A LG ADD
INVERT Pulled out
e. CHECK—CRT display for 0.1 division deflection, or
less (common-mode rejection ratio of 100:1 or greater).
f. Disconnect all test equipment.
31. Check AC-Coupled Lower Vertical Bandwidth
Limit
a. Change the following control settings:
CH 1 and 2 Input Coupling AC
Vertical Mode CH 1
INVERT Pushed in
TIME/DIV ,5 s
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
and the 50-ohm BNC termination.
c. Set the low-frequency generator for a four-division
display, centered on the graticule, at a reference 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
amplitude (not more than —3 dB).
f. Set the vertical Mode switch to CH 2.
g. Disconnect the 50-ohm termination from the INPUT
1 connector and reconnect it to the INPUT 2 connector.
h. Set the low-frequency generator for a four-division
display, centered on the graticule, at a reference frequency
of one kilohertz.
i. Without changing the output amplitude, reduce the
output frequency of the generator to two hertz.
j. CHECK—CRT display 2.8 divisions, or greater, in
amplitude (not more than—3dB).
k. Pull the X 10 GAIN AC switch.
l. Set the low-frequency generator for a four-division
display, centered on the graticule, at a reference frequency
of one kilohertz.
m. Without changing the output amplitude, reduce the
output frequency of the generator to five hertz.
n. CHECK—CRT display 2.8 divisions or greater in
amplitude (not more than —3 dB).
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