Calibration—475
h. Select 2 ns time marks from the Time-Mark
Generator.
i. 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.
j .
ADJUST—C1179
(see
Fig. 5-27)
with
a
low-
capacitance screwdriver, for 1 cycle/division.
k. Set the A TIME/D1V switch to 0.01 jus.
I.
CHECK—CRT display fo r 1 cyeie/2 divisions, w ithin
2% from +20°C to +30°C; 1 cycle/2 divisions, w ithin 4%
from —15°C to +55°C.
m. ADJUST—R1075
(see Fig. 5-28) with a low-
capacitance screwdriver, for 1 cycle/2 divisions.
n. CAL A ID —If the 2 ns tim ing is long and the 5 ns
timing is short, decrease Cl 179 and increase C l 233 or
Cl 253.
N O T E
I f tim ing cannot be adjusted to w ithin 2% accuracy
from + 2 0 ° C to + 3 0 ° C, o r 4% accuracy from —15°C
to + 5 5 °C , proceed to step 72. I f tim ing is w ith in the
given accuracy, proceed w ith step 73.
a. Set the A T IM E /D IV switch to 0 .0 5 jus and push the
X I 0 MAG button in.
b. Select 5 ns time marks and 0.1 jus triggers from the
Time-Mark Generator.
c. Connect a P6022 current probe with passive termina
tion from the Test Oscilloscope.
d.
Hook the current probe around the crossed horizontal
deflection leads on the 475 (see Fig. 5-29).
e. Horizontally center the trace w ith the horizontal
POSITION control.
f. Set the Test Oscilloscope: VO LTS/D IV switch to
5 mV, T IM E /D IV switch to 0.5 jus, and the X10 MAG
switch engaged.
g. CHECK—Test Oscilloscope fo r current waveform with
approximately 16 m A amplitude.
h. ADJUST—(See
Fig. 5-27),
R1175 to midrange,
R1185 to midrange, C l 233 and C l 253 half-closed, and
C l 179 one turn from fu lly clockwise.
i.
ADJUST—R1175 and R1185 (see Fig. 5-27) fo r a
symmetrical waveform similar to that in Fig. 5-30.
72. Adjust
High-Speed Timing—Current Probe
Method
N O T E
The signal am plitudes given in this step are o n ly
approxim ations and should o nly be used as guides. I t
is desirable to obtain as fla t and wide a current
waveform as possible.
Fig. 5-28. Location of 1 nanosecond timing adjustment.
j.
CAL A ID —The small ringing is from the Time-Mark
Generator. The top should be as fla t and wide as possible.
Since R1175 and R1185 have a greater effect on the 1 ns
and 2 ns ranges, they w ill be adjusted again later in the step.
k.
A D JU S T -C l 233 and C l 253 (see Fig. 5-27) equally
fo r 1 time marker/division.
Fig. 5-29. Proper connection of current probe to horizontal
deflection leads for high-speed timing calibration.
5-54
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 ...