Calibration—475
29. Check Bandwidth Limit Operation
a.
Connect a 6 division display of a 50 kHz signal to the
CH 1 input.
b.
Check frequency is 20 MHz, within 5 MHz, when
display is reduced to 4.2 divisions.
TR IG G ER SYSTEM C A LIB R A TIO N
30. Adjust A and B Trigger Sensitivity
a. V O L T S /D IV to 0.1 V ,
A SOURCE to E X T ,
A COUPLING to AC.
b.
Connect the Medium-Frequency Constant-Amplitude
Signal Generator (Type 191) to the A and B External
Trigger inputs via a 50 £2 5 ns GR cable, 50 £2 Signal
Pickoff Unit, GR-to-BNC adapter, X 10 attenuator, 50 £2
termination, and a dual input coupler.
c.
Connect the 10% BNC output of the Signal Pickoff
Unit to both channel inputs via a terminated dual input
coupler.
d.
A D JU ST—A and B Sensitivity, R565, R785, to just
obtain a stable display with a 0.35 division, 350 kHz signal.
31. Adjust Trigger Centering and Symmetry
a. V O L T S /D IV to 50 m V ,
SOURCE to NOR M ,
T IM E /D IV t o
10
ms
.
b.
Position a 2 division display of 350 kHz signal to the
center horizontal line.
c.
A D JU ST—B Trigger Symmetry, R547, so trigger point
is the same in both slopes.
d. A D JU ST—B Trigger Center, R543, for a triggering
point at graticule center.
e. A D JU ST—A Trigger Symmetry, R767, so triggering
point is the same in both slopes.
f.
A D JU ST—A Trigger Center, R754, for triggering point
at graticule center.
32. Adjust A Trigger DC Balance
a. A COU PLIN G to DC,
A SOURCE to N O R M ,
A L E V E L to 0.
b. Use a 0.3 division display.
c. A D JU S T —Normal Trigger DC Balance, R425, to
obtain a stable display in both slopes.
d. Change A SOURCE to CH 1.
e. A D JU S T —CH 1 Trigger DC Balance, R403, to obtain
a stable display in both slopes.
f. V E R T MODE to CH 2,
A SOURCE to CH 2.
g. Check for stable display in both slopes.
33. Check B Trigger DC Balance
a. B C O UPLING to DC,
B SOURCE to NORM ,
B L E V E L to 0,
V E R T MODE to CH 1.
b. Use a 0.3 division display.
c. Check for stable display in both slopes.
d. Set B SOURCE to CH 1 and repeat part c.
e. Set B SOURCE to CH 2, V E R T MODE to CH 2, and
repeat part c.
5-18
®
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 ...
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Page 200: ...FIG 3 RIGHT SIDE l 475 OSCILLOSCOPE ...
Page 201: ...V S X O t l B O T T OVJ 8 8 ...
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Page 210: ...5 ...
Page 211: ...4 4 75 O S C ILLO S C O P E FIG 5 CAB IN ET ...
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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 ...