C alib ratio n -475
2. Connect the autotransformer to a suitable power
source.
5. Set the controls as given under Preliminary Control
Settings (given prior to Part I —Performance Check). Allow
at least 20 minutes warmup before proceeding.
3. Connect the 475 to the autotransformer output.
N O T E
4. Set the auto transformer output voltage to the center
of the voltage range selected by the Line Voltage Selector.
Titles for external controls o f this instrument are
capitalized in this procedure (e.g., IN T E N S IT Y ).
Internal adjustments are initial capitalized only (e.g.,
C R T Grid Bias).
POWER SUPPLY C A LIB R A TIO N
Equipment Required
1. Precision DC Voltmeter
4. Three-inch Screwdriver
2. DC Voltmeter
3. Test Oscilloscope
5. Variable Auto-Transformer
Control Settings
Preset instrument controls to the settings given under
Preliminary Control Settings.
1- Check Power Supply DC Levels and Ripple
a.
Connect the Precision DC Voltmeter between test
point +50 V and GND (negative meter lead to ground) on
the main interface board. See Fig. 5-2.
c.
A D JU ST— +50 volt supply adjustment, R 1430, (see
Fig. 5-2) for a meter reading of +50 volts, within 0.1% or
50 m V.
d.
Using the Precision DC Voltmeter, measure the low
voltage power supplies given in Table 5-5. Observe proper
meter polarity. See Fig. 5-2 for test point locations.
b.
CHECK—Meter for a reading of +50 volts, within
0.5% or +250 mV.
Fig. 5-2. to w voltage power supply test points and +50 V adjust
ment.
e.
Using the Test Oscilloscope, check for correct ripple
as given in Table 5-5, while varying the autotransformer
between 103.5 VA C and 126.5 VAC .
TAB LE 5-5
Power Supply Tolerance and Ripple
Power Supply
Tolerance
Typical Ripple
(peak-to-peak)
+110 V
3% (3 .3 V )
1 V
+50 V
0.5% (250 m V)
2 m V
+15 V
1.5% (225 m V)
2 m V
+5 V
1.5% ( 75 m V)
2 m V
- 1 5 V
1.5% (225 m V)
2 m V
- 8 V
1.5% (120 m V)
2 m V
5-25
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 ...
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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 ...