N O T E
C l 2 5 3 m ay need to be dosed m ore than C l 2 3 3 to
m ake the top o f the waveform fla tte r on the 2 ns
range.
l
. Set the A T IM E /D IV switch to 0.02 jus and select 2 ns
time marks from the Time-Mark Generator.
m. Set the Test Oscilloscope T IM E /D IV switch to
0.2 jus, and the V O L T S /D IV switch to 10 m V.
n. A D JU ST—Cl 179 (see Fig. 5-27) for 1 time marker/
division.
o. CHECK—Test Oscilloscope for a current waveform
approximately 40 mA in amplitude.
p. Set the 475 A T IM E /D IV switch to 0.01 jus.
q. Set the Test Oscilloscope T IM E /D IV switch to 0.1 jus,
and the V O L T S /D IV switch to 20 mV.
r. A DJU ST—R1075 for 1 time marker/2 divisions.
s. CHECK —Test Oscilloscope for a current waveform
approximately 80 mA in amplitude.
t.
A D JU ST—R117.5 and R1185 for asymmetrical wave
form with a flat top.
N O T E
Q 1 2 3 4 affects the flatness o f the top o f the waveform
and should be changed i f i t is d iffic u lt to obtain a
flat-top waveform.
111 1 1
II 1 1
1
1
1
11 if
111 r "ill!
i L
i
1111
1111
I I I L
|MI.
111 r
Fig. 5-30. Typical CRT display with high-speed timing adjustments
preset.
Calibration—475
v. C HECK —Timing error at 2 ns and 5 ns ranges.
N O T E
I f 2 ns tim ing is long and 5 ns tim ing is short,
decrease C l 179 an d increase C 1 2 3 3 an d /o r C 1253.
w.
IN T E R A C T IO N —R 1175
and
R1185
should
be
readjusted for best symmetry and flatness on the 1 ns and
2 ns ranges if Cl 179, Cl 233, Cl 253, or R1075 is re
adjusted.
x.
Remove the current probe, being sure not to spread
the CRT horizontal deflection leads.
73. Check T IM E /D IV Accuracy
a.
C HECK —Using the A T IM E /D IV switch and the
Time-Mark Generator settings given in Table 5-7, check that
A SWEEP timing is within the given tolerance.
TAB LE 5-7
Timing Accuracy
A T IM E /
D IV
Switch
Setting
Time-
Mark
Generator
Output
CRT
Display
(markers/
division)
Accuracy
+20° C to
+30° C
—15° C to
+55° C
0.01
ns
10 ns
1
1%
3%
0.02 jus
10 ns
2
1%
3%
0.05 jus
50 ns
1
1%
3%
0.1 jus
0.1 jus
1
1%
3%
0.2 jus
0.1 jus
2
1%
3%
0.5 jus
0.5 jus
1
1%
3%
1 jus
1 JUS
1
1%
3%
2 jus
1 JUS
2
1%
3%
5 jus
5jus
1
1%
3%
I O
jus
10 jus
1
1%
3%
20 jus
IOjus
2
1%
3%
50 jus
50
jus
1
1%
3%
0.1 ms
0.1 ms
1
1%
3%
0.2 ms
0.1 ms
2
1%
3%
0.5 ms
0.5 ms
1
1%
3%
1 ms
1 ms
1
1%
3%
2 ms
1 ms
2
1%
3%
5 ms
5 ms
1
1%
3%
10 ms
10 ms
1
2%
3%
20 ms
10 ms
2
2%
3%
50 ms
50 ms
1
2%
3%
0.1 s
0.1 s
1
2%
3%
0.2 s
0.1 s
2
2%
3%
0.5 s
0.5 s
1
2%
3%
®
5-55
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 ...