Fig. 6-3. Recommended adjustment tools.
20. Two (2) adapters, BNC male to N female
2
. Tektronix
Part No. 103-0058-00.
21. Two (2) adapters, BNC female to N male
2
. Tektronix
Part No. 103-0045-00.
22.
10×
attenuator, BNC connector. Tektronix Part No.
011-0059-00.
A d j u s t i n g T o o l s .
See Fig. 6-3.
a. Screwdriver,
3
/
32
blade, 3 inch shaft
003-0192-00
b. Tuning tool
Handle
003-0307-00
Insert for
5
/
64
(D) hex cores
003-0310-00
Group II (optional)
Swept-Frequency Generator, with a frequency range 130
MHz to 280 MHz and amplitude variation less than 0.25 dB.
Suggested equipment—Kay Type 121C Multi-Sweep Genera-
tor.
Group III
RF Signal Generators, with calibrated frequency and output
power: Frequency range 10 MHz to 40 GHz, accuracy ±1%;
output power -100 dBm to -30 dBm, accuracy ±1 dB; out-
put impedance 50
Ω.
Suggested equipment:
Hewlett-Packard 612A UHF signal generator, 450
MHz
t o
1230
MHz.
Hewlett-Packard 8614A UHF signal generator, 800 MHz to
2400 MHz.
Hewlett-Packard 8616A UHF signal generator, 1800 MHz to
4500 MHz.
Polarad 1107 Microwave signal generator, 3.8 GHz to
8.2 GHz.
Polarad 1108 Microwave signal generator, 6.95 GHz to
11.0 GHz.
Hewlett-Packard
15.5 GHz.
Hewlett-Packard
21.0 GHz.
Hewlett-Packard
26.5 GHz.
Hewlett-Packard
40.0 GHz.
Hewlett-Packard
626A SHF signal generator,
628A SHF signal generator,
938 Frequency doubler set,
940 Frequency doubler set,
10.0 GHz to
15.0
GHz
t o
18.0
GHz
t o
26.5 GHz
to
X281 Wave-guide to coaxial adapter.
Hewlett-Packard NP292A Wave-guide to coaxial adapter.
Hewlett-Packard MX292B Wave-guide to coaxial adapter.
Hewlett-Packard MP292B Wave-guide to coaxial adapter.
Hewlett-Packard NK292A Wave-guide to coaxial adapter.
Hewlett-Packard 11503A Flexible wave-guide.
Hewlett-Packard 11504A Flexible wave-guide.
6-4
Summary of Contents for 491
Page 4: ...i i Fig 1 1 The Type 491 Spectrum Analyzer ...
Page 24: ...2 16 Fig 2 17 Control set up chart ...
Page 34: ...Fig 3 1 Function block diagram of the Type 491 3 2 ...
Page 42: ...Fig 3 10 Block diagram of the video detector and vertical amplifier 3 1 0 ...
Page 48: ......
Page 53: ...Fig 4 4 Power Supply Circuit board assembly with wiring color code 4 5 ...
Page 54: ...Fig 4 5 Horizontal Display circuit board assembly showing color code to pin connectors 4 6 ...
Page 55: ...Fig 4 6 IF Control board assembly Wiring color code to pin connector 4 7 ...
Page 64: ...Fig 4 20A Tube subassembly removal procedure 4 16 ...
Page 65: ...Fig 4 20B Tube subassembly installation procedure 4 17 ...
Page 68: ...Fig 4 22 Power supply board assembly with component call out 4 2 0 ...
Page 69: ...Fig 4 23 Vertical Amplifier and Blanking board assembly with component call out 4 21 ...
Page 70: ...Fig 4 24 IF control board assembly with component call out 4 22 ...
Page 71: ...Fig 4 24 IF control board assembly with component call out 4 23 ...
Page 72: ...Fig 4 25 Horizontal display board with component call out 4 24 ...
Page 73: ...Fig 4 25 Horizontal display board with component call out 4 25 ...
Page 74: ...Fig 4 26 Phase lock board with component call out 4 26 ...
Page 88: ......
Page 90: ...Fig 6 1 Test equipment recommended for calibration of the Type 491 6 2 ...
Page 138: ......
Page 192: ......
Page 195: ...SECTION II B 3 ...
Page 196: ......
Page 200: ......
Page 201: ...SECTION 9 DIAGRAMS MECHANICAL PARTS LIST ILLUSTRATIONS ACCESSORIES ...
Page 202: ......
Page 203: ...9 1 ...
Page 204: ...9 3 ...
Page 205: ...9 5 ...
Page 206: ...9 7 ...
Page 207: ...9 9 ...
Page 208: ...9 11 ...
Page 209: ...9 13 ...
Page 210: ...9 15 ...
Page 211: ...9 17 ...
Page 212: ...9 19 ...
Page 213: ...9 21 ...
Page 214: ...9 23 ...
Page 215: ...9 25 ...
Page 216: ...9 27 ...
Page 217: ...FIG 1 9 29 ...
Page 218: ...FIG 2 REAR 9 31 ...
Page 219: ...9 33 FIG 3 IF CHASSIS PHASE LOCK ASSEMBLIES ...
Page 220: ...FIG 4 POWER CHASSIS 9 35 ...
Page 221: ...FIG 5 TIME DIV SWITCH OSCILLATOR ASSEMBLIES 9 37 ...
Page 222: ...FIG 6 CRT SHIELD ASSEMBLY 9 39 ...
Page 223: ...FIG 7 CABINET ASSEMBLY HANDLE 9 4 1 ...
Page 224: ...FIG 8 491 STANDARD ACCESSORIES FIG 8 491 STANDARD ACCESSORIES 9 43 ...
Page 225: ......
Page 226: ...PIN 028017 000 ...