Calibration—
475
b.
Adjust the CH 1 POSITION control to horizontally
center the dot.
c.
Set the Test Oscilloscope: T IM E /D IV switch to 1 ms,
VO LTS/DIV switch to 0.5 V, and AC-GND-DC switch to
DC.
d. Connect a X I 0 probe from the Test Oscilloscope to
the +50 V test point on the 475 (see Fig. 5-26).
e. Position the trace on the Test Oscilloscope to the
center vertical graticule line.
f. Disconnect the probe from the +50 V test point.
g.
Alternately check the voltage on the collectors of
Q1214 and Q1204 (see Fig. 5-26).
h.
CHECK—That the voltage at the collectors of G1214
and Q1204 is equal.
i.
Adjust the 475 CH 1 POSITION control until the
voltage at the collector of Q1214 equals that on the
collector of Q1204.
j.
ADJUST—Horizontal O utput Centering adjustment,
R1256 (see Fig. 5-26), fo r +50 V on the collector of G1214
and G1204.
71. Adjust High-Speed Timing—Visual Method
NOTE
This step is intended only as a "touch u p " o f the
timing adjustments
.
I f the adjustments are greatly
misadjusted, o r m ajor portions o f the c ircu itry have
been replaced, proceed with step 72.
a.
Set the A T IM E /D IV switch to 0.05 jus, the X I 0 MAG
button in, the A SOURCE switch to EXT, and the A
COUPLING switch to LF REJ.
b.
Connect the output o f the Time-Mark Generator
(Type 2901) to the CH 1 input via a 42-inch 50 £2 BNC
cable and a 50 £2 BNC term ination.
c.
Connect the TRIGGER OUT of the Time-Mark
Generator to the A External Trigger input via a 42-inch
50
El
BNC cable and a 50
El
BNC term ination.
d.
Select 5 ns time marks and 0.1 jus triggers from the
Time-Mark Generator.
e.
CHECK—CRT display fo r 1 cycle/division, w ithin 2%
from +20°C to +30°C; 1 cycle/division, w ithin 4% from
—15°C to +55° C.
f.
ADJUST—C l233 and C l253 (see Fig. 5-27), w ith a
low-capacitance
screwdriver,
in
approximately
equal
amounts to achieve 1 cycle/division.
Fig. 5-26. Location of Q 1204, Q 1214, +50 V TP, and Horizontal
Fig. 5-27. Location of high-speed timing adjustments {except
Output Centering adjustment.
R1075).
®
5-53
Summary of Contents for 475
Page 6: ...475 475 Oscilloscope ...
Page 20: ......
Page 46: ......
Page 151: ...A B C D E F G Fig 7 4 P 0 A4 Vertical Mode Switch circuit board ...
Page 152: ...n m m m 1 t siumm c ii im ...
Page 154: ...Diagrams 475 A B C D E F G ...
Page 155: ...GRID LOCATOR Fig 7 8 P O A3 Vertical Preamp circuit board ...
Page 157: ...Diagrams 475 ...
Page 158: ...GRID LOCATOR 2 3 4 5 6 7 8 9 1 10 11 1 12 Fig 7 10 P 0 A3 Vertical Preamp circuit board ...
Page 160: ...Diagrams 475 GRID LOCATOR Fig 7 11 A5 Vertical Output circuit board ...
Page 163: ...Diagrams 475 GRID LOCATOR Fig 7 12 P O A8 Trigger Generator And Sweep Logic circuit board ...
Page 167: ... 415 OSCILLOSCOPE B T R IG G E R G E N E R A T O R g B TR IG G E R GEN ER A TO R ...
Page 168: ...Diagrams 475 GRID LOCATOR ...
Page 172: ...SWEEP G E N ER A TO R S ...
Page 175: ...TIM IN G HORIZONTAL DISPLAY SWITCHING ...
Page 177: ...A 011 HORIZONTAL AMPLIFIER 8 l j k J Ll J Ol Z o N C O X U 1 C L O o v O o _J V v P O in r ...
Page 179: ... 476 OSCILLOSCOPE ...
Page 180: ...POWER SUPPLY ...
Page 182: ...CRT CIRCUIT ...
Page 185: ...C A L IB R A T O R A N D F A N C I R C U I T 4 C A LIB R A TO R FAN MOTOR C IR C U IT ...
Page 189: ......
Page 190: ...4 T 475 OSCILLOSCOPE FIG 1 FRO NT PANEL ...
Page 191: ...475 OSCILLOSCOPE FIG 2 MAIN FRAME ...
Page 199: ......
Page 200: ...FIG 3 RIGHT SIDE l 475 OSCILLOSCOPE ...
Page 201: ...V S X O t l B O T T OVJ 8 8 ...
Page 209: ......
Page 210: ...5 ...
Page 211: ...4 4 75 O S C ILLO S C O P E FIG 5 CAB IN ET ...
Page 215: ......
Page 237: ......
Page 241: ... 1 I R I II9A po S IT I o n f i n e I R l 130 PAGE 4 OF 5 R 1234 Ml 9 91 9 473 ...