Calibration—475
c. Set the Test Oscilloscope T IM E /D IV switch so that
the bottom portion of the waveform (holdoff tim e o f the
+A GATE) is slightly less than one division.
d. Rotate the A TRIG HOLDOFF control clockwise
(not into the B ENDS A detent).
e. CHECK—For at least nine times increase in the
holdoff time of the +A GATE.
f. Set the A TRIG HOLDOFF control fu lly counter
clockwise.
C A LIB R A TO R , + GATES, AND
EXT Z-A XIS C A LIB R A TO R
Equipment Required
1. Medium-Frequency Constant-Amplitude Signal Genera-
4. BNC-T Connector
tor (Type 191)
2. Precision DC Voltmeter
3. GR-to-BNC Female Adapter
5. 42-inch 50 £2 BNC Cable (two)
6. Three-inch Screwdriver
Control Settings
Preset instrument controls to the settings given under
Preliminary Control Settings.
83. Adjust CALIB R A TO R Amplitude
a. Connect the Precision DC Voltmeter between the
CALIBRATOR current loop and ground.
b. Short the emitter and base o f Q1504 together (see
Fig. 5-32).
c. CHECK—For a meter reading of +0.3 volt, w ithin
3 mV.
d. ADJUST—Calibrator Am plitude adjustment, R1515
(see Fig. 5-32) for +0.3 volt, w ithin 1% from 0°C to +40°C;
for +0.3 volt, w ithin 1.5% from —15°C to +55°C.
Fig. 5-32. Location of Q 1504 and Calibrator amplitude adjustment.
e. Remove the Precision DC Voltm eter connections and
the short between emitter and base of Q1504.
84. Check A and B + GATE Outputs
a. Set the D ELAY TIM E POSITION dial fu lly counter
clockwise, the HORIZ DISPLAY switch to B D LY 'D , the B
SOURCE switch to STARTS AFTER D ELAY, the B
T IM E /D IV switch to 50
ms
, and the TRIG MODE to
AUTO.
b. Connect the B + GATE output signal to the Test
Oscilloscope via a 42-inch 50 12 BNC cable.
c. CHECK—Test Oscilloscope for a positive-going pulse
+5.5 volts in amplitude (within 0.5 V).
d. Remove the B + GATE output signal and connect the
A + GATE output signal to the Test Oscilloscope.
e. CHECK—Repeat step 84-c.
f. Disconnect the test setup.
85. Check EXT Z-A XIS Operation
a. Set the HORIZ DISPLAY switch to A, the A
T IM E /D IV switch to 0.2 ms, and the A SOURCE switch to
NORM.
®
5-59
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 ...