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Calibration—214 Service
VERTICAL SYSTEM
Equipment Required
1. DC Voltmeter
2.
Low-Frequency
Constant-Amplitude
Signal
Gen-
erator (General Radio 1310-B Oscillator)
3. Standard Amplitude Calibrator (067-0502-01)
4. Square-Wave Generator (Type 106)
5. Probe tip-to-BNC Adapter
6. GR-to-BNC Adapter
7. 10X BNC Attenuator
8. 50 2 BNC Termination
9. Three-inch Screwdriver
10.
Low-capacitance Screwdriver
Control Settings
Preset
instrument
controls
to the settings given
under
Preliminary Control Settings, except as follows:
INTENSITY
Visible Display
9. Adjust Vertical DC Centering
a. Connect the DC Voltmeter between pin 11 of U105,
on
the Amplifier
(A-2) board,
(positive meter lead to pin
11) and ground. See Fig. 4-6.
b. Adjust the CH 1 POS control for a 0 volt reading on
the meter.
VERTICAL
CENTERING
f
R101
—
TATION
ww
i
Y
AMPLIFIER
:
Ro
Fig. 4-6.
Location of Vertical Centering adjustment and test point.
or
there
B e Raghe. Mevernt
4-8
c. CHECK—Trace
should
be within
approximately
0.4
division of graticule center.
d.
ADJUST—Vertical
Centering,
R101
(see Fig. 4-6) to
position the trace to the center horizontal graticule line.
e. Disconnect the meter leads.
10. Adjust Channel 1 Step Attenuator Balance
a. Rotate the CH 1 VOLTS/DIV
switch from 50m to
1m.
b. CHECK—The
CRT display for 0.1 division, or less, of
vertical trace shift between adjacent switch positions from
50 m to 1m.
c. ADJUST—CH 1 STEP
ATTEN
BAL,
R417
(locatéd
on the side panel)
for minimum
trace shift when rotating
the CH 1 VOLTS/DIV
switch from 50 m to 1 m.
11. Adjust Channel 2 Step Attenuator Balance
a. Turn
the
CH1
POS
control
to OFF
and
the CH 2
POS control to midrange.
b. Rotate the CH 2 VOLTS/DIV
switch from 50 m to
im.
c. CHECK—The
CRT display for 0.1 division, or less, of
vertical
trace shift between adjacent switch positions from
50 m to 1m,
d. ADJUST—CH
2 STEP
ATTEN
BAL,
R315
(located
on the side panel) for minimum
trace shift when
rotating
the CH 2 VOLTS/DIV switch from 50 m to 1 m.
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