Theory of Operation
2715 Spectrum Analyzer Service Manual
3- 51
The comparators are contained in an LM319, U9. The top (UP) comparator
determines if the summing node is greater than the 49.5 mV reference point. The
bottom (DN) comparator determines is the summing node is less than the 0.0 V
reference. The outputs of these two comparators, UP and DN, are fed into the
Horizontal LCA. Inside the Horizontal LCA the UP and DN signals are
debounced to prevent false changes in the internal counter. Also inside the
Horizontal LCA is a small state machine which decodes the debounced UP and
DN signals, the SWPGATE signal, and the internal counter, to determine
whether to increment or decrement the internal counter.
A typical sequence of events for the tracking A/D converter are described in the
following paragraph.
First assume that the summing node starts a stable point and a valid sweep is
running. The SWP signal begins to increase. Once the output of U36 has
increased enough to force the summing node above the positive reference point
of 49.5 mV, the output of the top comparator, UP signal, goes high. This signals
the state machine inside the Horizontal LCA to increment its internal counter.
The outputs of this internal counter are fed back to the U11, increasing its sink
current, bring the summing node back inside the comparator window. At the
transition of the internal counter to a new value, the signal EOB (End Of Bin)
goes high until all data has been written into waveform memory. The reverse
procedure occurs for a SWP signal that is decreasing.
The timing diagram show in Figure 3--18 depicts a section of a typical sweep for
the Horizontal Tracking A/D Converter.
BCLK
UP
DN
HACQ<8..0>
HAD<8..O>
EOB
0ns
500ns
1000ns
1500ns
2000ns
2500ns
3000ns
Figure 3- 18: Timing Diagram of a Typical Sweep for the Horizontal Tracking A/D Converter
Vertical Input
.
The purpose of the Vertical Input section is to provide gain and
offset to the incoming LOGVID signal prior to a flash A/D Converter (ADC).
The LOGVID signal is amplified by operational amplifier U2, an NE5534. U2 is
configured as an inverting amplifier with a gain of about --3.5. Input signal gain
is adjusted using R24 (VIG), while input offset is adjusted using R20 (VIO). The
output of U2 is then passed through a resistive divider, which reduces the output
Содержание 2715
Страница 4: ......
Страница 16: ...Service Safety Summary xii 2715 Spectrum Analyzer Service Manual ...
Страница 152: ...Theory of Operation 3 94 2715 Spectrum Analyzer Service Manual ...
Страница 254: ...Adjustment Procedures 5 66 2715 Spectrum Analyzer Service Manual ...
Страница 292: ...Options 7 4 2715 Spectrum Analyzer Service Manual ...
Страница 436: ...Replaceable Electrical Parts 8 144 2715 Spectrum Analyzer Service Manual ...
Страница 438: ...Diagrams 9 2 2715 Spectrum Analyzer Service Manual ...
Страница 445: ...Replaceable Mechanical Parts 2715 Spectrum Analyzer Service Manual 10 7 1 2 3 4 5 6 7 8 9 10 11 12 Figure 10 1 Cabinet ...
Страница 463: ...Replaceable Mechanical Parts 2715 Spectrum Analyzer Service Manual 10 25 1 2 3 4 5 6 7 8 9 Figure 10 6 Accessories ...
Страница 464: ...Replaceable Mechanical Parts 10 26 2715 Spectrum Analyzer Service Manual ...
Страница 468: ......
Страница 474: ...Service Safety Summary vi 2715 Spectrum Analyzer Service Manual ...
Страница 481: ...9 5 2715 Spectrum Analyzer Service Manual 2715 1 RF ATTENUATOR A18 ...
Страница 483: ...9 7 2715 Spectrum Analyzer Service Manual 1 1ST CONVERTER A16A1 2715 ...
Страница 485: ...2715 Spectrum Analyzer Service Manual 9 9 1 RF INPUT A16A2 2715 ...
Страница 487: ...9 11 2715 Spectrum Analyzer Service Manual 1 YIG BUFFER AMPLIFIER A17 2715 ...
Страница 489: ...9 13 2715 Spectrum Analyzer Service Manual 2715 1 1ST LO INTERFACE A19A1 ...
Страница 490: ...2715 Spectrum Analyzer Service Manual 9 14 ...
Страница 491: ...9 15 2715 Spectrum Analyzer Service Manual 2715 2 1ST LO A19 ...
Страница 493: ...9 17 2715 Spectrum Analyzer Service Manual Figure 1 9 A12A1 Phaselock CFC back ...
Страница 495: ...9 19 2715 Spectrum Analyzer Service Manual PHASELOCK CFC BOARD SIGNAL INTERCONNECT A12A1 2715 0 ...
Страница 496: ...2715 Spectrum Analyzer Service Manual 9 20 ...
Страница 497: ...9 21 2715 Spectrum Analyzer Service Manual 2715 PHASELOCK CFC A12A1 1 ...
Страница 498: ...2715 Spectrum Analyzer Service Manual 9 22 ...
Страница 499: ...9 23 2715 Spectrum Analyzer Service Manual 2715 2 PHASELOCK CFC A12A1 ...
Страница 500: ...2715 Spectrum Analyzer Service Manual 9 24 ...
Страница 501: ...9 25 2715 Spectrum Analyzer Service Manual PHASELOCK CFC A12A1 2715 3 ...
Страница 502: ...2715 Spectrum Analyzer Service Manual 9 26 ...
Страница 504: ...2715 Spectrum Analyzer Service Manual 9 28 ...
Страница 506: ...2715 Spectrum Analyzer Service Manual 9 30 ...
Страница 507: ...9 31 2715 Spectrum Analyzer Service Manual 2715 6 PHASELOCK CFC POWER SUPPLY A12A1 ...
Страница 509: ...9 33 2715 Spectrum Analyzer Service Manual 2715 1 HF VCO A12A2 ...
Страница 511: ...9 35 2715 Spectrum Analyzer Service Manual LF VCO A12A3 1 2715 ...
Страница 514: ...2715 Spectrum Analyzer Service Manual 9 38 ...
Страница 515: ...9 39 2715 Spectrum Analyzer Service Manual SIGNAL INTERCONNECT RF MOTHER BOARD A14 0 2715 ...
Страница 516: ...2715 Spectrum Analyzer Service Manual 9 40 ...
Страница 517: ...9 41 2715 Spectrum Analyzer Service Manual RF MOTHER A14 1 2715 ...
Страница 518: ...2715 Spectrum Analyzer Service Manual 9 42 ...
Страница 519: ...9 43 2715 Spectrum Analyzer Service Manual 2 RF MOTHER A14 2715 ...
Страница 520: ...2715 Spectrum Analyzer Service Manual 9 44 ...
Страница 521: ...9 45 2715 Spectrum Analyzer Service Manual 3 RF MOTHER A14 2715 ...
Страница 522: ...2715 Spectrum Analyzer Service Manual 9 46 ...
Страница 523: ...9 47 2715 Spectrum Analyzer Service Manual 2715 4 RF MOTHER A14 68 1 R213 ...
Страница 526: ...2715 Spectrum Analyzer Service Manual 9 50 ...
Страница 527: ...2715 Spectrum Analyzer Service Manual 9 51 2715 0 SIGNAL INTERCONNECT A28 VIDEO DEMOD BOARD ...
Страница 528: ...9 52 2715 Spectrum Analyzer Service Manual ...
Страница 529: ...2715 Spectrum Analyzer Service Manual 9 53 2715 1 A28 DEMOD 1 VIDEO DEMOD BOARD NOT USED ...
Страница 530: ...9 54 2715 Spectrum Analyzer Service Manual ...
Страница 534: ...2715 Spectrum Analyzer Service Manual 9 58 ...
Страница 535: ...2715 Spectrum Analyzer Service Manual 9 59 SIGNAL INTERCONNECT A11 DIGITAL OPTIONS BOARD 0 2715 ...
Страница 536: ...9 60 2715 Spectrum Analyzer Service Manual ...
Страница 537: ...2715 Spectrum Analyzer Service Manual 9 61 1 MICROPROCESSOR BUS INTERFACE DIGITAL OPTIONS BOARD A11 2715 ...
Страница 538: ...9 62 2715 Spectrum Analyzer Service Manual ...
Страница 539: ...2715 Spectrum Analyzer Service Manual 9 63 2715 2 PHASE LOCKED LOOP EPROM AND NVRAM A11 DIGITAL OPTIONS BOARD ...
Страница 540: ...9 64 2715 Spectrum Analyzer Service Manual ...
Страница 541: ...2715 Spectrum Analyzer Service Manual 9 65 REAL TIME CLOCK AND RS232 INTERFACE DIGITAL OPTIONS BOARD A11 3 2715 ...
Страница 542: ...9 66 2715 Spectrum Analyzer Service Manual ...
Страница 543: ...2715 Spectrum Analyzer Service Manual 9 67 4 VIDEO GATING LOGIC AND GPIB INTERFACE DIGITAL OPTIONS BOARD A11 2715 ...
Страница 544: ...9 68 2715 Spectrum Analyzer Service Manual ...
Страница 545: ...2715 Spectrum Analyzer Service Manual 9 69 2715 IF GATE A11 DIGITAL OPTIONS BOARD 5 ...
Страница 548: ...2715 Spectrum Analyzer Service Manual 9 72 ...
Страница 549: ...9 73 2715 Spectrum Analyzer Service Manual 0 SIGNAL INTERCONNECT VARIABLE RES0LUTION BOARD A13 2715 ...
Страница 550: ...2715 Spectrum Analyzer Service Manual 9 74 ...
Страница 551: ...9 75 2715 Spectrum Analyzer Service Manual 1 VARIABLE RESOLUTION A13 2715 ...
Страница 552: ...2715 Spectrum Analyzer Service Manual 9 76 ...
Страница 553: ...9 77 2715 Spectrum Analyzer Service Manual 2 A13 VARIABLE RESOLUTION 2715 ...
Страница 554: ...2715 Spectrum Analyzer Service Manual 9 78 ...
Страница 555: ...9 79 2715 Spectrum Analyzer Service Manual 3 VARIABLE RESOLUTION A13 2715 ...
Страница 556: ...2715 Spectrum Analyzer Service Manual 9 80 ...
Страница 557: ...9 81 2715 Spectrum Analyzer Service Manual 4 VARIABLE RESOLUTION A13 2715 ...
Страница 560: ...2715 Spectrum Analyzer Service Manual 9 84 ...
Страница 561: ...9 85 2715 Spectrum Analyzer Service Manual 2715 0 SIGNAL INTERCONNECT A23 RF OPTION BOARD ...
Страница 562: ...2715 Spectrum Analyzer Service Manual 9 86 ...
Страница 563: ...9 87 2715 Spectrum Analyzer Service Manual 1 RF OPTION A23 2715 ...
Страница 564: ...2715 Spectrum Analyzer Service Manual 9 88 ...
Страница 565: ...9 89 2715 Spectrum Analyzer Service Manual 2715 2 RF OPTION A23 ...
Страница 566: ...2715 Spectrum Analyzer Service Manual 9 90 ...
Страница 567: ...9 91 2715 Spectrum Analyzer Service Manual 2715 3 RF OPTION A23 ...
Страница 569: ...9 93 2715 Spectrum Analyzer Service Manual Figure 1 24 A7 Log Amp back ...
Страница 571: ...9 95 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 SIGNAL INTERCONNECT 0 ...
Страница 572: ...2715 Spectrum Analyzer Service Manual 9 96 ...
Страница 573: ...9 97 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 NOT USED 1 ...
Страница 574: ...2715 Spectrum Analyzer Service Manual 9 98 ...
Страница 575: ...9 99 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 2 ...
Страница 576: ...2715 Spectrum Analyzer Service Manual 9 100 ...
Страница 577: ...9 101 2715 Spectrum Analyzer Service Manual LOG AMP BOARD A7 2715 3 ...
Страница 578: ...2715 Spectrum Analyzer Service Manual 9 102 ...
Страница 579: ...9 103 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 4 ...
Страница 580: ...2715 Spectrum Analyzer Service Manual 9 104 ...
Страница 581: ...9 105 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 5 ...
Страница 582: ...2715 Spectrum Analyzer Service Manual 9 106 ...
Страница 583: ...9 107 2715 Spectrum Analyzer Service Manual 2715 A7 LOG AMP BOARD 6 ...
Страница 585: ...9 109 2715 Spectrum Analyzer Service Manual 0 A21 SIGNAL INTERCONNECT REFERENCE OSCILLATOR BOARD 2715 ...
Страница 586: ...2715 Spectrum Analyzer Service Manual 9 110 ...
Страница 587: ...9 111 2715 Spectrum Analyzer Service Manual 2715 1 REFERENCE OSCILLATOR A21 ...
Страница 588: ...2715 Spectrum Analyzer Service Manual 9 112 ...
Страница 589: ...9 113 2715 Spectrum Analyzer Service Manual 2715 2 REFERENCE OSCILLATOR A21 ...
Страница 591: ...9 115 2715 Spectrum Analyzer Service Manual Figure 1 28 A10 Microprocessor back ...
Страница 593: ...9 117 2715 Spectrum Analyzer Service Manual 0 SIGNAL INTERCONNECT A10 MICROPROCESSOR BOARD 2715 ...
Страница 594: ...2715 Spectrum Analyzer Service Manual 9 118 ...
Страница 595: ...9 119 2715 Spectrum Analyzer Service Manual CLOCK CPU AND INTERRUPT CONTROLLER MICROPROCESSOR BOARD A10 1 2715 ...
Страница 596: ...2715 Spectrum Analyzer Service Manual 9 120 ...
Страница 597: ...9 121 2715 Spectrum Analyzer Service Manual RAM A10 MICROPROCESSOR BOARD 2 2715 ...
Страница 598: ...2715 Spectrum Analyzer Service Manual 9 122 ...
Страница 599: ...9 123 2715 Spectrum Analyzer Service Manual ROM A10 MICROPROCESSOR BOARD 3 2715 ...
Страница 600: ...2715 Spectrum Analyzer Service Manual 9 124 ...
Страница 601: ...9 125 2715 Spectrum Analyzer Service Manual 2715 CONTROL A10 MICROPROCESSOR BOARD 4 ...
Страница 602: ...2715 Spectrum Analyzer Service Manual 9 126 ...
Страница 603: ...9 127 2715 Spectrum Analyzer Service Manual 5 FREQUENCY COUNTERS MICROPROCESSOR BOARD A10 2715 ...
Страница 604: ...2715 Spectrum Analyzer Service Manual 9 128 ...
Страница 605: ...9 129 2715 Spectrum Analyzer Service Manual FREQUENCY COUNTERS AND I O SUBSYSTEM A10 MICROPROCESSOR BOARD 6 2715 ...
Страница 606: ...2715 Spectrum Analyzer Service Manual 9 130 ...
Страница 607: ...9 131 2715 Spectrum Analyzer Service Manual COUNTER INPUT SELECT MICROPROCESSOR BOARD A10 7 2715 ...
Страница 608: ...2715 Spectrum Analyzer Service Manual 9 132 ...
Страница 609: ...9 133 2715 Spectrum Analyzer Service Manual CONNECTORS AND DECOUPLING A10 MICROPROCESSOR BOARD 8 2715 ...
Страница 613: ...9 137 2715 Spectrum Analyzer Service Manual 1 2715 SIGNAL INTERCONNECT A9 DISPLAY STORAGE BOARD ...
Страница 614: ...2715 Spectrum Analyzer Service Manual 9 138 ...
Страница 615: ...9 139 2715 Spectrum Analyzer Service Manual NOT USED NOT USED NOT USED 2 CONNECTORS A9 2715 DISPLAY STORAGE BOARD ...
Страница 616: ...2715 Spectrum Analyzer Service Manual 9 140 ...
Страница 617: ...9 141 2715 Spectrum Analyzer Service Manual ADDRESS DECODING AND DATA BUFFERING A9 2715 DISPLAY STORAGE BOARD 3 ...
Страница 618: ...2715 Spectrum Analyzer Service Manual 9 142 ...
Страница 619: ...9 143 2715 Spectrum Analyzer Service Manual CONTROL REGISTERS A9 4 2715 DISPLAY STORAGE BOARD ...
Страница 620: ...2715 Spectrum Analyzer Service Manual 9 144 ...
Страница 621: ...9 145 2715 Spectrum Analyzer Service Manual 2715 5 A9 HORIZONTAL TRACKING A D CONTROL DISPLAY STORAGE BOARD ...
Страница 622: ...2715 Spectrum Analyzer Service Manual 9 146 ...
Страница 623: ...9 147 2715 Spectrum Analyzer Service Manual 2715 6 A9 VERTICAL DATA PROCESSING AND NVRAM DISPLAY STORAGE BOARD ...
Страница 624: ...2715 Spectrum Analyzer Service Manual 9 148 ...
Страница 625: ...9 149 2715 Spectrum Analyzer Service Manual 2715 READOUTS AND WAVEFORM DRAWINGS A9 DISPLAY STORAGE BOARD 7 ...
Страница 626: ...2715 Spectrum Analyzer Service Manual 9 150 ...
Страница 628: ...2715 Spectrum Analyzer Service Manual 9 152 ...
Страница 630: ...2715 Spectrum Analyzer Service Manual 9 154 ...
Страница 631: ...9 155 2715 Spectrum Analyzer Service Manual 10 HORIZONTAL OUTPUT DISPLAY STORAGE BOARD A9 2715 ...
Страница 632: ...2715 Spectrum Analyzer Service Manual 9 156 ...
Страница 633: ...9 157 2715 Spectrum Analyzer Service Manual 11 A9 VERTICAL OUTPUT DISPLAY STORAGE BOARD 2715 ...
Страница 634: ...2715 Spectrum Analyzer Service Manual 9 158 ...
Страница 635: ...9 159 2715 Spectrum Analyzer Service Manual 12 A9 MISCELLANEOUS DISPLAY STORAGE BOARD 2715 ...
Страница 637: ...9 161 2715 Spectrum Analyzer Service Manual 2715 SIGNAL INTERCONNECT A6 FRONT PANEL BOARD 0 ...
Страница 638: ...9 162 2715 Spectrum Analyzer Service Manual ...
Страница 639: ...9 163 2715 Spectrum Analyzer Service Manual SWITCH MATRIX A6 FRONT PANEL BOARD 2715 1 ...
Страница 640: ...9 164 2715 Spectrum Analyzer Service Manual ...
Страница 641: ...9 165 2715 Spectrum Analyzer Service Manual OUTPUT SHIFT REGISTERS AND POTS A6 FRONT PANEL BOARD 2715 2 ...
Страница 642: ...9 166 2715 Spectrum Analyzer Service Manual ...
Страница 643: ...9 167 2715 Spectrum Analyzer Service Manual GRAY CODE AND SERVICE REQUEST ACKNOWLEDGE A6 FRONT PANEL BOARD 2715 3 ...
Страница 644: ...9 168 2715 Spectrum Analyzer Service Manual ...
Страница 645: ...9 169 2715 Spectrum Analyzer Service Manual INPUT SHIFT REGISTERS AND LEDS A6 FRONT PANEL BOARD 2715 4 ...
Страница 648: ...2715 Spectrum Analyzer Service Manual 9 172 ...
Страница 649: ...2715 Spectrum Analyzer Service Manual 9 173 A5 2715 SIGNAL INTERCONNECT SWEEP BOARD 0 ...
Страница 650: ...9 174 2715 Spectrum Analyzer Service Manual ...
Страница 651: ...2715 Spectrum Analyzer Service Manual 9 175 VIDEO BUFFERING A5 2715 SWEEP BOARD 1 ...
Страница 652: ...9 176 2715 Spectrum Analyzer Service Manual ...
Страница 653: ...2715 Spectrum Analyzer Service Manual 9 177 2715 VIDEO TRIGGER A5 SWEEP BOARD 2 ...
Страница 654: ...9 178 2715 Spectrum Analyzer Service Manual ...
Страница 655: ...2715 Spectrum Analyzer Service Manual 9 179 2715 A5 SERIAL CONTROL REGISTER SWEEP BOARD 3 ...
Страница 656: ...9 180 2715 Spectrum Analyzer Service Manual ...
Страница 657: ...2715 Spectrum Analyzer Service Manual 9 181 2715 SWEEP RAMP GENERATOR SWEEP BOARD A5 4 ...
Страница 664: ...9 188 2715 Spectrum Analyzer Service Manual ...
Страница 665: ...2715 Spectrum Analyzer Service Manual 9 189 0 SIGNAL INTERCONNECT POWER SUPPLY BOARD A15A1 ...
Страница 666: ...9 190 2715 Spectrum Analyzer Service Manual ...
Страница 667: ...2715 Spectrum Analyzer Service Manual 9 191 2715 ...
Страница 668: ...9 192 2715 Spectrum Analyzer Service Manual ...
Страница 669: ...2715 Spectrum Analyzer Service Manual 9 193 2715 ...
Страница 670: ...9 194 2715 Spectrum Analyzer Service Manual ...
Страница 671: ...2715 Spectrum Analyzer Service Manual 9 195 2715 ...
Страница 672: ...9 196 2715 Spectrum Analyzer Service Manual ...
Страница 673: ...2715 Spectrum Analyzer Service Manual 9 197 2715 ...
Страница 674: ...9 198 2715 Spectrum Analyzer Service Manual ...
Страница 675: ...2715 Spectrum Analyzer Service Manual 9 199 2715 ...
Страница 676: ...9 200 2715 Spectrum Analyzer Service Manual ...
Страница 677: ...2715 Spectrum Analyzer Service Manual 9 201 2715 ...
Страница 678: ...9 202 2715 Spectrum Analyzer Service Manual ...
Страница 679: ...2715 Spectrum Analyzer Service Manual 9 203 2715 ...
Страница 680: ...9 204 2715 Spectrum Analyzer Service Manual ...
Страница 681: ...2715 Spectrum Analyzer Service Manual 9 205 2715 ...
Страница 682: ...9 206 2715 Spectrum Analyzer Service Manual ...