Calibration—475
c.
CHECK—That the U NC AL light comes on when the
V A R T IM E /D IV control is out of the detent position.
d.
Return the V A R T IM E /D IV control to the detent
position.
20. Check Timing Accuracy
a.
C HECK—Using the A T IM E /D IV switch and the
Time-Mark Generator settings given in Table 5-3, check that
A SWEEP timing is within the given tolerance over entire
10 divisions.
b.
C HECK —Using the A T IM E /D IV switch, the B
T IM E /D IV switch and the Time-Mark Generator settings
given in Table 5-4, check that delayed sweep accuracy is
within the given tolerance. First set the D E L A Y T IM E
POSITION dial to 1.00 and rotate the dial until the sweep
starts at the top of the second time marker. Note the
control setting and then set the dial to 2.00 and rotate it
slightly until the sweep starts at the top of the third time
marker. The error for intervals less than 1 dial division
cannot exceed 0.01 dial division. Continue to rotate the
D E L A Y T IM E POSITION dial to check between the 1.00
and 9.00 settings for all A sweep speeds from 0.05 jus to
0.5 s. The difference between any two time markers greater
than 1 dial division apart cannot exceed 1%.
TA B LE 5-3
A and B Timing Accuracy
A T IM E /
D IV
Switch
Setting
Time-
Mark
Generator
Output
CRT
Display
(markers/
divisions)
Accuracy
+20° C to
+20° C
—15°C to
+55° C
0.01 jus
10 ns
1
1%
3%
0.02 /is
10 ns
2
1%
3%
0.05 jus
50 ns
1
1%
3%
0.1 jus
0.1 Ms
1
1%
3%
0.2 jus
0.1 Ms
2
1%
3%
0.5 jus
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
1%
3%
20
ms
10
ms
2
1%
3%
50
ms
50
ms
1
1%
3%
0.1 ms
0.1 ms
1
i%
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%
21. Check Delay Tim e Accuracy
a. Set the B SOURCE switch to STARTS A FTE R
D E L A Y , the A T IM E /D IV switch to 0 .0 5 jus, the B
T IM E /D IV switch to 0.01 Ms, and the H O R IZ D ISPLAY
switch to B D L Y 'D .
N O T E
Sweep will start a t the top o f the third time marker at
1.00 and a t the top o f the nineteenth time marker at
9 .0 0 fo r sweep rates that are multiples o f 2 (e.g., 2 ps,
2 0 ps, 0 .2 ms
,
etc.). I f in doubt as to the correct
setting o f the D ELA Y T IM E P O S ITIO N dial, set the
H O R IZ D IS P L A Y switch to A IN T E N and check
which time marker is intensified.
TA B LE 5-4
Delayed Sweep Accuracy
A T IM E /D IV
B T IM E /D IV
Time-Mark
Switch
Switch
Generator
Setting
Setting
Output
0.05 Ms
0.01 MS
0.05 Ms
0.1 Ms
0.01 Ms
0.1 MS
0.2
ms
0.05
ms
0.1 Ms
0.5
ms
0.05 Ms
0.5
ms
1 Ms
0.1 MS
1 Ms
2
ms
0.1 MS
1 Ms
5
ms
0.1
ms
5
ms
10
ms
1 Ms
10
ms
20
ms
1 Ms
10
ms
50
ms
1 Ms
50
ms
0.1 ms
10
ms
0.1 ms
0.2 ms
10
ms
0.1 ms
0.5 ms
10
ms
0.5 ms
1 ms
0.1 ms
1 ms
2 ms
0.1 ms
1 ms
5 ms
0.1 ms
5 ms
10 ms
1 ms
10 ms
20 ms
1 ms
10 ms
50 ms
1 ms
50 ms
0.1 s
10 ms
0.1 s
0.2 s
10 ms
0.1 s
0.5 s
10 ms
0.5 s
5-12
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 ...