ENGINEERING RESEARCH INSTITUTE THE UNIVERSITY OF MICHIGAN ANN ARBOR SPINNING DISK ELECTRONIC RANDOM SELECTOR Technical Memorandum No. 39 Electronic Defense Group Department of Electrical Engineering By: G. A. Roberts Approved by: ______________ A. B. Macnee Project 2262 TASK ORDER NO. EDG-3 CONTRACT NO. DA-36-039 sc-63203 SIGNAL CORPS, DEPARTMENT OF THE ARMY DEPARTMENT OF ARMY PROJECT NO. 3-99-O04-O42 SIGNAL CORPS PROJECT NO. 19)4B May 1957

TABLE OF CONTENTS Page LIST OF ILLUSTRATIONS iii LIST OF TABLES iii ABSTRACT iv 1. INTRODUCTION 1 2. EQUIPMENT DESCRIPTION 1 3. CIRCUIT DESIGN 2 4. EQUIPMENT AND CIRCUITS 7 DISTRIBUTION LIST 29 ii

ENGINEERING RESEARCH INSTITUTE ELECTRONIC DEFENSE GROUP ERRATA TECHNICAL MEMORANDUM NO. 39 Page No. iii Figure 4, Change "slide" to "side." 7 Paragraph 1, Line 5 Change "condensers" to "condensers." 7 Paragraph 6, Line 1 Change "condensers" to "condensers." 10 Figure 7 - Diagram Changes: Insert a resistor R-98 100k 1/2 w in series with the lead to pin 2 of V-9a. Similarly insert a resistor R-99 100k 1/2 w in series with the lead to pin 7 of V-lOb. Near V-8, right in middle of page: Leads 1 through 9 on S-3 are incorrectly connected to V-8. Following is a drawing of the corrections: I ~ 2 3 4.5 7 8 9 0 Figure 7 - Parts List Changes: R-64 Change 2.2k to 2.7k R-67 Change 2.2k to 2.7k R-97 Add R-98, R-99 along side R-97 C-30 Following C-30 insert: C-31 0.1 Afd 600 VDC paper V-15 Following V-15 insert: D1, D2, D3 1N39 T-1 Change P-8408 to PC-8408 T-2 Change P-8401 to PC-8401 L-1 Change P-lOO11 to C-1001 L-2 Change P-1003 to C-1003 PL-2 Change "Blue" to "Bulb"

ERRATA TM 39 (continued) Page s 14 Figure 11 - Diagram Changes: Near V-1 i, Left middle of page Connect the left side of C-3 to pin 6 (plate) of V-1 and disConnect the left side of C-3 from pin Y (grid). Near V-6. Left middle of page Delete C-15 and replace R-27 with a wire. Near "question switch," top middle of page - change label "S2ff to t"J Near T-1; Right top of page The center tap of T-1 should not be grounded. Instead the center Tap should be connected to the junction of L-2 and C-12. Near V-9 and V-11, Right bottom of page The cathodes on V-9 and V-ll labeled "1,2,6,8" should be labeled fli tt Figure 11 - Parts List Changes: R-21 Change 10 W to 25 W R-27 Delete R-52 Replace "not used" with "10K" C-15 Delete T-1 Change PC-8408 to PC-8402 T-2 Change PC-8402 to PC-8408 S-2 Change S-2 to J-1 Following "TA-2" add "or A-2" NE Change 147-1112 tD 147-1144 15 D.C. Supply Voltages Change "measures" to "measured" 23 Waveform (t) under Notes Chan,- "hundreds 0" to "hundreds 1" 26 Table 3, under Resistors Change "2 2.2K 1/2w" to "2 2.7K 1/2w" Change "7 lOOK 1/2w" to "9 100K 1/2w" 27 Table 3, under Condensers Add "l 0.1 gfd 600 VDC paper" Table 3, under Tubes Add "DIODES" "3 1N39" Add "MISCELLANEOUS" "See Page 10, Figure 7 Parts List." 28 Table 4 Delete "1 5.6k 1/2w" Change "3 10k 1/2w" to "4 10k 1/2w" Change "10 watt Dividohm" to "25 watt Dividohm" Delete "1 O.lfd 400 VDC metalized"

LIST OF ILLUSTRATIONS Page Figure 1 Basic Block Diagram of the Spinning Disk Random Selector 3 Figure 2 Black Diagram for Electronic Random Selector Spinning Disk, Type "C", Model 1 4 Figure 3 Front View of the Spinning Disk Random Selector, Type "C", Model 1 8 Figure 4 Slide View of Chassis 8 Figure 5 Bottom View of Chassis 9 Figure 6 Back View of Chassis 9 Figure 7 Circuit Diagram for an Electronic Random Selector Spinning Disk, Type "C", Model 1 10 Figure 8 Electronic Spinning Disk Random Selector, Type "C", Model 3 11 Figure 9 Electronic Spinning Disk Random Selector, Type "C", Model 3 12 Figure lOa Electronic Spinning Disk Random Selector Type "C", Model 2 13 Figure 10b Back View of Chassis 13 Figure 11 Electronic Random Selector Spinning Disk, Type "C", Model 2, Serial 1 14 LIST OF TABLES Table 1 Voltage and Resistance Measurements on the Spinning Disk Random Selector, Model 1 15 Table 2 Waveforms for the Circuit of Fig. 7 19 Table 3 Components for Type "C", Model 1, Serial 1 26 Table 4 Components for Model 2, Serial 1 28 iii

ABSTRACT A three decade spinning disk electronic random selector or number generator is described. The number selections are equally likely and the modulus is adjustable from 10 to 1000 in increments of 10. iv

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN SPINNING-DISK ELECTRONIC RANDOM SELECTOR 1. INTRODUCTION This memorandum describes a random selector for generating random numbers that are equally-likely. The modulus of the random selector can be adjusted from 10 to 1000 in increments of 10. 2. EQUIPMENT DESCRIPTION Photographs of the complete unit are shown in Figures 3-6. This random selector has three decade counters for reading out the selected number and one neon bulb indicator for an equally-likely binary output. The selection of a number is obtained by depressing the Q-switch (Question-Switch). The principle of operation of this random selector is as follows: An electronic counter of modulus N is driven continuously by a recurrent pulse generator. This means that the counter will be in each of its N possible states the same length of time. Therefore, each number is equally-likely. The Q-switch is placed between the pulse generator and the counter so that the counter can be stopped when a selection is desired. Randomness is obtained by operating the counter at a relatively high rate with respect to the period between operations of the Q-switch. Anything that operates the Q-switch, such as a human operator, will have some variance in its timing. If this variance is large with respect to the period for one cycle of modulus N, then independence of number selections is obtained.

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN 3. CIRCUIT DESIGN A basic block diagram of the spinning disk random selector is shown in Figure 1. This illustration shows the recurrent pulse generator, the gate circuit or Q-switch, and the counter and readout circuit of modulus N. To facilitate reading the schematic diagram a more detailed block diagram of the equipment is shown in Figure 2. The random selector described here was designed to meet the following requirements. (1) The questioning of the equipment would be manual and occur no faster than once per second. (2) The maximum modulus of the counter should be 1000 and should be adjustable from 10 to 1000 in increments of 10. (3) The counter should use cold cathode counter tubes because of the low cost, small size, low power requirements, and direct readout. (4) In addition to the modulus N selection, an equally-likely binary output should be provided. The use of cold cathode counter tubes sets an upper limit to the operating speed of the counter. The type GC-10-D tube, which is a decade counter, has a maximum counting rate of 20 kc, and thus has an output of 2 kc. The GC-10-D oes not have separate pin connections for each cathode; therefore, it cannot be used as a preset counter. The GS-10-C has separate cathodes but is limited in counting speed to 4 kc. Thus the maximum counting speed can be achieved by using one GC-10-D and two GS-10-C tubes. This arrangement will also allow the desired modulus adjustment. The independence of number selections is a result of operator timing variation. Relative to a starting time (to) the operator timing variation will have a peaked probability density curve. In order to obtain equally-likely number selections, the probability of the operator stopping the counting process in an interval (Atb) in the modulus cycle must be the same for any (At) in the — 2 —---

RECURRENT QUESTION ELECTRONIC PULSE COUNTER AND READOUT GENERATOR SWITCH MODULUS N INPUT (OPERATION OF THE QUESTION SWITCH AT THE TIME A SELECTION IS DESIRED.) FIGURE 1. BASIC BLOCK DIAGRAM OF THE SPINNING DISK RANDOM SELECTOR 3

~G-9-, 93: g-~S-V Z9ZZ {S j ~ _ U'} 1 z ^ I ^ j — I illi~~~~i~ 0 0:E:~~~~~~~~~~~~~~~~~~~~~~~~~~~' i'"" z^' LL.. 1'~ ~ ~ ~ - z w~~~~~~~~~ w~ It~~~~~~~~~~~~~ t-?c ui pc - ~ ~ ~ ~ w~;g $ g p I- t~~~Z 5|H -^- u| 1 —---- ^ 3|J~ og- U^~~~~~ ^~~~~~~~~~ I --- I I - ^ - ---,__~~~~ U) 1 ~- ~K 0: ~ ~ z~~~~~~~ -0 r^~~~~~~~U U^ z U. u 0^ 0?~s~~~~~~ - m <

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN modulus cycle. Since the counting process is cyclic the probability density of operator timing variation will be segmented into periods equal to the modulus period. If the modulus period is made short relative to the period between requests for random numbers and is less than or equal to the standard deviation (a%) of the operator timing variation, then the addition of the segments of the probability density curve will result in an approximately uniform distribution over the modulus period. This segmenting and addition of the segments of a probability density curve is known as the wrap-around effect. Birdsall has calculated the peak-to-peak difference to be l% of the peak wrap-around probabili-1, ty density when the modulus period equals 1.6 times the standard deviation of the operator timing.1 For this particular counter, which has a maximum modulus of 1000, the maximum modulus period is 0.05 second. If a criterion of 1% variation in wraparound probability density is selected, then the smallest a should be 0.03 0~~~~~~~~~~~~~ 2 second. Any a0 larger than 0.03 second will result in a more uniform wraparound probability density. If a "safety factor" is desired the operator of the equipment should not watch the counter tubes prior to actuating the Q-switch, since timing information can be obtained from the hundreds counter. The result of receiving this information may be a reduction in a0.. The modulus of the counter is set by two switches. The switches select one cathode on the tens counter and one on the hundreds counter. The outputs from the switches are applied to a coincidence circuit such that when a voltage exists between both the selected cathodes and ground the counter is forced to reset. Thus, any modulus between 10 and 1000 in increments of 10 may be obtained. 1. If N is the modulus, ~, (ec nubr 1 + 005 1 2. Experiments by the writer have shown that for a human operator to count "1/1000", "2/1000" takes about 1.5 seconds with a a0Q of about 0.4i0 seconds. 5

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN The output of the binary unit is applied to the modulus N counter. A GC-10-D counter is used for the units decade. All cathodes except the output cathode are tied together in this tube; therefore, only decade counting can be obtained. The output indicator is an integral part of the counter and is a gaseous discharge glow that can appear in one of ten different positions on a circular path. The angular position indicates the count. The output cathode and resistor produce one output pulse for every ten input pulses to the counter. This pulse is coupled to the input of the next counter. The physical orientation of the tube relative to the bezel should be such that the output cathode lines up with the "0" on the bezel. The tens and hundreds counters are identical to each other and are similar to the units counter. The primary difference is that the tens and hundreds counters have a lower counting speed (4 kc) and all cathodes are brought out separately. A cathode is illuminated by a current flowing through it and a voltage drop is developed across the cathode resistor. Since all cathodes are brought out separately, and each one has a separate resistor, the location of the cathode glow can be identified by the presence of a voltage. This provides a convenient method for identifying the state of the counter. In this particular application an eleven position switch is used with the tens and hundreds counters to select the cathodes that trigger the automatic reset circuit. As mentioned above, when coincidence of these two switch outputs occurs, the tens and hundreds counters are reset to "0". The coincidence circuit drives a reset circuit in order to provide a sufficiently long reset pulse. The reset circuit is a multivibrator followed by a reset amplifier for the tens counter and one for the hundreds counter. Since the reset circuit insures that resetting goes to completion there is no bias towards the last number in the modulus or 000. 1. This tube may be obtained from the Atomic Instrument Company of Cambridge, Massachusetts. 6

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN 4. EQUIPMENTS AND CIRCUITS Photographs of the Electronic Spinning Disk Random Selector (Type "C"t, Model 1) are shown in Figures 3, 4, 5, and 6. The complete circuit diagram is shown in Figure 7. The voltages and resistances at important points are tabulated in Table 1. Typical waveforms are shown in Table 2. Quantities, values and types of resistors, condensers and tubes are shown in Table 3. The 460 and 420 volt busses are nominal values. The exact settings of these voltages will depend on the average ac line voltage and the particular counter tubes in the equipment. The equipment may be expected to operate with 30% variation in the line voltage with new tubes. Photographs and circuits for two similar random selectors are also included in this report. One of these is a single decade portable unit and the other is a three decade rack-mounted random selector. The three decade random selector does not have an adjustable modulus but does have an automatic circuit for displaying the random number for a time and then returning to the counting cycle. A photograph of the single decade random selector is shown in Figure 8. The circuit for this unit is shown in Figure 9. This is designated as Electronic Spinning Disk Random Selector, Type "C", Model 3. Photographs of the three decade rack-mounted random selector are shown in Figure 10. The circuit for this selector is shown in Figure 11. The designation of this unit is Electronic Spinning Disk Random Selector, Type "C", Model 2. Quantities, values and types of resistors, condensers and tubes are shown in Table 4. 7 -

FIG. 3. FRONT VIEW OF THE SPINNING DISK RANDOM SELECTOR, TYPE "C", MODEL I. FIG. 4. SIDE VIEW OF CHASSIS.

FIG. 5. BOTTOM VIEW OF CHASSIS FIG. 6. BACK VIEW OF CHASSIS 9

40 KC OSCILLATOR FLIP -FLOP Lob +250 VDC C2~~~~~~~~~~~~~~~~~~~~~~~~~~ >R R — 7C; v10^ ---- ^ -~~~~~ ~~ ~~~C4 ^8 V0J L \ r9;C5 /^ V-15B F " — ^- T "__________ t ---- -6VD ---- I"93 I [;^7>J~~~~~~~R9 R1 R- 1.:;6 R97 MARYp -^~ -- ] 11 1 \T^"~~~~~~~~~~~~~~EADOUT' ---?[ ^ ~__________ RIS~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4 jI R2 Mo2-R2 R4 9 C14 _____ l C8a LEAD LENGTH __ _ ~^( — ---, ----- -- ~~~~~~~~1/4 INCH -- -- ~ RICV,', ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~V 6 CETER CN ~~.CI ^ —---------------------------------—. PN " 1.^ ----- -------------------— cis —-— PIN1>'*~~~~~~ ~ V4 ____ — - - - - -- ^ V-5 - - -- -1-7\.-^y-V~~~~~~C 4TfT -- ^ ^^HZ') 1 s5,k ^... —.l,.^ ~~ ~ via tr-6 -^ r r r r ry^ -"T^ r'^ rr (FROIA ~ ~ ~ ~ ~ ~ ~ -- VI)__ __ 32 023 4^ 5 b ~Z,^5 R2 >5 R4 ^S R6 >B 5 R9 >6 6 R2 __'.Rl-r~ ~ ~ ~ ~ ~ ~ ~~~~~Or olRZ R 22 R2 R2 53 6 9669666 OFF 6 0 ^ R7 2R7 4R7 5R8 6R8 9R RR66 R71:R7 f~~~~~~~~~~~~~~~ C24 V9o0 - p V 9b VlO --- ~V10b vilo -- - - Vilb V o - - ^^IbFG R;R64;R65 R67?R70 ^R73 *6 E2 R9 ^8SC M D L 1

Resistors Condensers Rl 1 meg1/2 w Cl 3 33 pfd 600 VDC Ceramic R2, 3 47 Is;2. C4, 47 pfd 600 VDC Ceramic R4 1 meg 1/2 w C6 5QOO pfd 600 VDC Ceramic R5, 6, 7 47 k 1w C7 15 pfd 600 VDC Ceramic R8, 9 270 k 1/2 w C8 33 pfd 600 VDC Ceramic R10, 11 10Q k1/2 w C9 500 pfd 600 VDC Ceramic R12 12 k 1/2 wC1, 100 pfd 600 VDC Ceramic R13 1jmeg 1/2 w c14 200 pfd 600 VDC Ceramic R14, 15 100 k 1w"1 300 pfd 600 VDC Ceramic R16680 k 1/2 w.C16 1000 pfd 600 VDC Ceramic R17 82 k/2 w C17 200 pfd 600 VDC Ceramic R1810 k 1/2 w C18 1Qo pfd 600 VDC Ceramic R19 270 k 1/2 w C19: 200 pfd 600 VDC Ceramic R20 56 k1/2'w C20 300 pfd 600 VDC Ceramic R21, 22, 23 220 k 1/2 w C21 1000 pfd 600 VDC Ceramic R24 68 k 1/2 w 2 2 1500 pfd 600 VDC Ceramic R25 330 k 1/2 w C23, 24, 25 500 pfd 600 VDC Ceramic R26 22 meg/2w C26 27; 1 fd 200 VDC Metalized R27820 k1/ C28, 29, 3Q 30 4fd 450 VDC Electrol tics R28, 29 100 k1 w R30 10 k 1/2 w R31 1 meg /2 w R32 330 k 1/2 w Tuqes R33 390 k 1/2 w R34.,~-35, 36,. 37 68k1/2 w VI 12AT7 38, 39, 40, 41i, 42, 43 V2 5963 R44 470 k 1/2 w V3 12AT7 R45' 22 meg1/2 w v4 GC-10-D R46 820 k 1/2,: w V5 12AX7 R47, 48100 k w GS-10-C R49 1 meg 1/2 w Y7 12AX7 R50 10 k 1/2 w V6 GS-10-C R51 330 k 1/2 w V9, 10, 11, 12 12AT7 R52 390 k/2w V13, 14 5v4 GAR53, 54, 55, 56, 57, 68 kV1/2 w V5 1/2 12AT7 58, 59, So, 61, 62 R63 4TO ^^J v/2 -S 1:;Question Switch. This switch should be?D4";1 2.'fr k a slow operating type, An 0.05 second R65 33 k.5 sec Rb5 JJ0k.:// w uncertainty in the time of operation is'desirable. A switchcraft type 3Q33L R67 2.2 k 1/2 w switch can be used. This switch should R68; 69 47 k 1ww Rbo) ~9^ k _/2 w be modified so that t I direction is R7_, 72 100 k1 w spring return, that is non-locking, R73 10 k 1/2 W R74 3.3 ^n/p lj'2 w:S 2, 3, 4 1 circuit 10 position non-shorting.'itral AB J~ Section R75 Does not exist. R76 1 meg 1/2 w R7100^^ k 1;/2 wj^ s S t handle DPST. GC 1332 R78 56 k 2w' R7856 k.7- PL1 Dn bulb pilot, light. Johnson type RT9> * ~ k~jd. w 7-li44. Red Lucite Cap. R80.81 100 k1 w R825.6 k1/2 w pg^ iicating type fuze holder R83 56 k2 w.ttlefuse No. 344013 R84 100 k 1/2 w R851 k10 w F 1 L. 1.5 Amp R86 15 k 25 w T 1 Stancor P-8408 R87 680 k 1/2 w T 2 Stancor P-8401 R8868 k1/2 w L 1 Stancor P-1Q01 R891 meg12 w L 2 Stancor P-1003 R90 470 k 1/2 w R91 100 k I w Cabinet Hewlett-Packard cabinet used on 211-A R92 68 k 1/2 w Square Wave Generator R93 100 k 1/2 w R94 150 k 1 Wn MO 1 He~wlett-Packard 3l4-3 R95 1.0 meg 1/2 v R96 3~3 meg1/2: w pg Blade Hewlett-Packard 3l4-9 R97100o k1/2 w Air Filter Hewlett-Packard G-46-A PL 2 Neon Blue Pilot Light. Johnson Ty-pe 147-1142. Clear Lucite Cap,

FIG. 8 ELECTRONIC SPINNING DISK RANDOM SELECTOR, TYPE "C", MODEL 3. 11

LG-8-V 93 ~ LL- S-V Z9ZZ rd o 0 n 0 F~~-P C o k o d ~ +' It i t aN 0 O t rd o n ror N.0 0 Cc m cm n N N o o U ) ujrQ * / * CU rd r Ca 0 oo L QI Q m (Mu~ rvl~ o E-1 o 0ff OJ 0 C H n Ei oo P, 0 0 < 0 1 0 C) 2 (YI r - P-s -C? L____ _ _cu Ca ^ U) <0~ ~ 0z Q rCQ z - ZC I L CL CC-,!) 0 oH uj *U 4-' 14-) LLJ L2 LA 0 4-, 0 UU I$~~~(' ~ CQ 02 C1 Cy i CY)C C\j CY) JO oCLr\r-0 -P C C J Ca Rn H I rC r \01 CU) 00

FIG. 10 a ELECTRONIC SPINNING DISK RANDOM SELECTOR, TYPE "C", MODEL 2. FIG. lOb BACK VIEW OF CHASSIS. 13

99-L-21 18,104 992- 13- 3 39 zz r~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~R 1mg / 6.~~~~~~~~~~~~~~~~2 EbO~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~9 10 2.2 e 1/2 2 3 4 11 13 14 15 11 2~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~R1 mg2ABPt 410~~~~~~~~~~~~~~~~~~~~~R1,1 0 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~1 10 12 1/2 C2 1 6 6 6~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~R1 0 / 5~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~ ~ ~~ ~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~I 19wiewon 3~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~. 3 AC 3IAEN~ 8 E2Rk1 v~o ih2tp VI~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~fL Q- \F2 3 1272510 2~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~V,- -,]-* 2 e / C5 R8 R1 C7 410 16 CL 9 g RJ CIO 2 20 V12 ______ __,/__, ^R, $< --- | V-H' —/; g ( > } K3T, 38 100~~~~~~~~~~~~~ 24.~-. R25. — R26-. 28 R 33 R35 R3 39R 381/24 R5 R - _^1:;~~~~~~~~~~~~1 j^ ^ J l-^ - - ^v — 2-O — L — 4i2 ^^-.-^7^^^~~C1 CY.-^ 21 C25~L.=,,^^ 2 2, 8,. ^ V 3 87 24, 10 2~~~~~~~~~~~~~SIC R5 10 1,2162 V ~ ~ ~ ~ ~ ~ ~~ -< 31- ~ 32S Gi + R41 330 1 6~~~~~~~ 7 8 V9 2 8TR46 1/2 __. 1 —I R55 Not used.~~~~FI. 1 ^ ______________ -' __ELECROIC ______ i ____ ___ RA DO SEECO SPINNING —--- DISK TYPE 1/ __________ —-MO D —---- 2 -------------- I-Cnesr

TABLE 1 VOLTAGE AND RESISTANCE MEASUREMENTS ON THE SPINNING DISK RANDOM SELECTOR MODEL 1 Note: This equipment will normally operate with a supply voltage between 95 and 130 vac. Differences in tubes and components may in some cases limit this range. The following data are for one set of tubes with a nominal input supply voltage. Thus variations can be expected between different equipments. In general these measurements can be used as a service guide. A. C. VOLTAGES Measured with a Triplett 630-NA Measurement Point Voltage Comments E line 111 VRMS V13 Between Pins 4 and 6 460 VRMS V14 Between Pins 4 and 6 670 VRMS D.C. SUPPLY VOLTAGES Measures with a Triplett 630-NA Measurement Point Voltage Comments V14 Pin 8 +290 VDC Relative to Ground C28 +285 VDC Relative to Ground V13 Pin 8 +210 VDC Measured Relative to the Positive Side of C-28 C30 +240 VDC Relative to Ground C29 +490 VDC Relative to Ground 420 Volt BUS +410 VDC Relative to Ground 460 Volt BUS +470 VDC Relative to Ground 15

TABLE I (Continued) D.C. Voltages Measured with a 122 Megohm VTVM, HP-410B Measurement Point Q-Switch Voltage Comments V1 Pin 1 Plate ------— 125 V Pin 2 Grid -------— 31 V Pin 6 Plate ------— 118 V Pin 7 Grid -------— 38 V R5, 6, 7 Junction Count 134 V Read 134+ -lV V2 Pin 6 Plate Count 80 V Read 50, 120 V Pin 7 Grid Count 17 V Read 28, 11 V Pin 8 Cathode Count 29 V Read 29- 1 to 3 V V3 Pin 1 Plate Count 87 V Read 42 V Pin 2 Grid Count 16 V Read 16+ -6 V Pin 3,8 Cathode Count 23 V Read 23- 3 V Pin 6 Plate Count 180 V Read 240 V Pin 7 Grid Count 10 V Read 5V R19, 20 Junction Count 55 V Read 55 —5 to 10 V V4 Pin 6 Cathode Count 2.5 V Read 0 V No Glow on "0". Read 30 V Glow on "0". V5 Pin 1 Plate Count 220 V Read 220+-5 to 20 V Pin 2 Grid Count 6.5 V Read 6.5+ 1 V Pin 3,8 Cathode Count 21 V Read 21- 1 to 3 V Pin 6 Cathode Count 76 V Read 76- 10 V Pin 7 Grid Count 17 V Read 17+_3 V V6 Pin 10 Cathode Count 2.2 V Read 25 V Glow on "1" Read 0 V No Glow on "1" V15 Pin 1 Plate Count 225 V Read 225 V Glow not on 9 of tens. Read 200 V Glow on 9 of tens. Pin 2 Grid Count 2.2 V Read 0 V Glow not on 9 of tens. Read 25 V Glow on 9 of tens. 16

TABLE I (Continued) Measurement Point Q-Switch Voltage Comments V15 Pin 3 Cathode Count 9.5 V Read 8 V Glow not on 9 of tens. Read 28 V Glow on 9 of tens. The Following Measurements Are Made With the Modulus Selectors Off. V9 Pin 1 Plate ---— 240 V Pin 2 Grid ----- 0 V Pin 3,8 Cathode ----- 5 V Pin 6 Plate -— 20 V Pin 7 Grid ----- 5 V Vll Pin 1 Plate ---— 240 V Pin 2 Grid ----- 0 V Pin 3,8 Cathode ----- 19 V Pin 6 Plate ----- 50 V Pin 7 Grid ----- 19 V V12 Pin 1 Plate ---— 240 V Pin 2 Grid ----- 0 V Pin 3 Cathode ---— 22 V The Following Measurements Are Made With V10 Connected to a Cathode With a Glow, But Not Zero, and V9 Connected to a Cathode With No Glow. V9 Pin 2 Grid Read 0 V Pin 3,8 Cathode Read 7 V Pin 6 Plate Read 28 V Pin 7 Grid Read 7 V V10 Pin 7 Grid Read 24 V Pin 3, 8 Cathode Read 26 V Pin 1 Plate Read 28 V Pin 2 Grid Read 7 V The Following Measurements Are Made With V9 Connected to "0" And V10 Connected to "O". This Is The Coincidence Condition. V9 Pin 2 Grid Read 20 V Pin 3 Cathode Read 22 V Pin 6 Plate Read 230 V Pin 7 Grid Read 15 V V10 Pin 7 Grid Read 25 V Pin 3, 8 Cathode Read 27 V Pin 1 Plate Read 230 V Pin 2 Grid Read 15 V 17

TABLE I (Continued) Resistances All resistances measured to ground with a Triplett 630-NA. Note the AC power must be off. Measurement Point Resistance Comments V1 Pin 1 70 K Pin 2 1 Meg V2 Pin 1 8 K Pin 2 80 K Pin 3 15 K V3 Pin 1 120 K Pin 2 1 Meg Pin 3,8 10 K Pin 6 120 K Pin 7 80 K R19, 20 Junction 50 K V4 Pin 6 68 K V5 Pin 1 120 K Pin 2 750 K Pin 3, 8 10 K Pin 6 120 K Pin 7 1 Meg R87, 88 Junction 65 K R90, 89 Junction 330 K S4, Hundreds Modulus, at 0. V9 Pin 7 33 K V12 Pin 3 5 K Pin 1 120 K 250 V BUS 20 K 18

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW t —-- 10 /z SEC/CM +300 V-I EXT V-I OFF I RI r H PIN 6 PIN 6 NEGATIVE 1 ^kH (ba) SLOPE t10.L SEC/CM _ ~+_QQ-|00V JUNCTION EXT. V-l ON POF PIN 6 R-, R6, R7 NEGATIVE e(C) SLOPE 10 O/4 SEC/CM 20 /L SEC/CM V-2 EXT V-i ON THIS +300 ~PIN 6 PIN 6 WAVEFORM 9 NEGATIVE MAY BE ~et~~ ~(d) SLOPE SHIFTED BY ONE~~~~~~~~~~~0 ~~~HALF CYCLE. 20 /. SEC/CM TABLE 2 WAVEFORMS FOR THE CIRCUIT OF FIG. 7'9

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW V-3 EXT. V-2 ON ~~+300 -- |PIN 6 PIN I e(e) NEGATIVE eQ~~~~~~ WSS~l~y^SSSSSLOPE T 20 FL SEC/CM THE SWEEP V-4 EXT. V-2 ON RATE VERN+40 __ — H ^ |PIN 6 PIN I IER MUST BE NEGATIVE ADJUSTED TO 0E IE (f) ||SLOPE STOP THE 0W~~~~~ _ _.~~~~ II~~~~ IHORIZONTAL ______________________ ~~~~~~DRIFT OF THE WAVEFORM. t -- ^" MODULUS BETWEEN 50 AND o00 u SEC/CM SELECTOR OFI V-4 INT. ON MODULUS +40 PIN 6 POSITIVE SELECTOR mm (g) SLOPE OFF t —— > 100 /. SEC/CM V —5 EXT. V-4 ON MODULUS PIN 6 PIN 6 SELECTOR e _ t ___* _______I__IPOSITIVE OFF e _ _ _ _ _ (h) SLOPE 100 AL SEC/CM TABLE 2 (CONT.) WAVEFORMS FOR THE CIRCUIT OF FIG. 7 20

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW V-5 EXT. V-4 ON MODULUS 100 /. SEC/CM V-6 INT. ON MODULUS e PIN I POSITIVE SELECTOR SLOPE OFF +20 (iJt") I MILLISEC/CM I MILLISEC/CM 50 p. SEC/CM TABLE 2 (CONT.MODULUS PINWAVEFORMS FOR THE CIRCUIT OF FIG. 7 S21LO I MILLISEC/CM.......' V-7 EXT. V- 6 ON MODULUS PIN 6 PIN 2 SELECTOR NEGATIVE OFF et ( k ) SLOPE t'50 MLLSEC/CM e! (I) SLO~~~~~e

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW I MILLISEC/OM ___B__+300 |_ V|V-7 INT. ON MODULUS J!~t = |PIN I PIN 2IVE SELECTOR e (m) NEGATIVE OFF +O~20 ( _ ISLOPE O t' PIN I POSITIVE SELECTOR e20 (n) SLOPE HUNDROFF TENS 6 0 20 MLLISEC/CM V-ll INT. ON MODULUS ALT L 2PIN 6 POSITIVE SELECTOR 1 e 111 ( 0) i | SLOPE HUNDREDS 0 TENS 6 t - 20 u. SEC/CM OeP | I SLOPE HUNDREDS O 20 / SEC/CM TABLE 2 (CONT.) WAVEFORMS FOR THE CIRCUIT OF FIG. 7 22

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW +300 ________ _ I V-12 INT. ON MODULUS +300 AL n l X (q) I PIN I NEGATIVE SELECTOR e (q) SLOPE HUNDREDS 0 TENS 6 20 p/ SEC/CM V-6 INT. ON MODULUS PIN I NEGATIVE SELECTOR 0e o (r) l SLOPE HUNDREDS 0 TENS 6 -200 t —-- 0.5 MILLISEC/CM V-6 EXT. ON MODULUS +100 JUNCTION POSITIVE SELECTOR 0 Ci (S) BETWEEN SLOPE HUNDREDS 0 t f D-2 8 R-43 JUNCTION TENS 6 BETWEEN D-3 8& R-62 5 MILLISEC/CM D-3 R-62 V-6 EXT ON MODULUS +100 _ - JUNCTION POSITIVE SELECTOR ~ = (t) BETWEEN SLOPE HUNDREDS O D-2 & R-43 JUNCTION TENS 6 BETWEEN D-3 8 R-62 5 MILLISEC/CM TABLE 2 (CONT.) WAVEFORMS FOR THE CIRCUIT OF FIG. 7. 23

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW +60 -- — ^- V-6 EXT ON MODULUS JUNCTION POSITIVE SELECTOR 0 (U) BETWEEN SLOPE HUNDREDS 2 Ie D-2 & R-43 D-3 & R-62 TENS 6 t " 5 MILLISEC/CM _+ _^^60 |SAME AS SAME AS ON MODULUS _ _~ (v) |(U) (U) SELECTOR 0-j __mj (V) HUNDREDS 3 et I TENS 6 5 MILLISEC/CM ^^^+60 r SAME AS SAME AS ON MODULUS 0 N-fl *I ll (w) HUNDREDS I eT _ 11t~l' ~ I I I ITENS 0 t —-i 2 MILLISEC/CM SAME AS SAME AS ON MODULUS +60 (u) (u) SELECTOR 0 O ~~(x) HUNDREDS I TENS I 2 MILLISEC/CM TABLE 2 (CONT.) WAVEFORMS FOR THE CIRCUIT OF FIG. 7 24

MEASUREMENT TRIGGER POSITION NOTES POINT SOURCE OF Q-SW SAME AS SAME AS ON MODULUS +60 ---- +6n. () (U) (U) SELECTOR tU 2 MILLISEC/CM SAME AS SAME AS ON MODULUS +60 (u) (u) SELECTOR 0 (Z) HUNDREDS I et____________ I TENS 3 2 MILLISEC/CM TABLE 2 (CONT.) WAVEFORMS FOR THE CIRCUIT OF FIG. 7 25

Table 3 Components for Type "C", Model 1, Serial 1 Resistors Quantity Resistance Wattage 2 2.2 k 1/2 w 2 5.6 k 1/2 w 4 10 k 1/2 w 1 12 k 1/2 w 1 33 k 1/2 w 2 47 k 2 w 5 47 k 1w 2 56 k 2 w 1 56 k 1/2 w 23 68 k 1/2 w 1 82 k 1/2 w 11 100 k 1 w 7 100 k 1/2 w 1 150 k 1 w 3 220 k 1/2 w 3 270 k 1/2 w 3 330 k 1/2 w 2 390 k 1/2 w 4 470 k 1/2 w 2 680 k 1/2 w 2 820 k 1/2 w 8 1m 1/2 w 2 3.3 m 1/2 w 2 22 m 1/2 w 1 1 k 10 w wire wound ~~~~1 15 k25w {dividohm with 12 taps 26

Table 3 (Continued) Condensers Quantity Capacitance Rating 1 15 pfd 600 VDC Ceramic 4 33 pfd 600 VDC 2 47 pfd 600 VDC 5 100 pfd 600 VDC " 3 200 pfd 600 VDC" 2 300 pfd 600 VDC 4 500 pfd 600 VDC 2 1000 pfd 600 VDC 1 1500 pfd 600 VDC 1 5000 pfd 600 VDC 2 1 ufd 200 VDC Metalized 3 30 Ifd 450 VDC Electrolytic Tubes Quantity Type 2 5V4 GA 7 12AT7 2 12AX7 1 5963 2 GS-10-C GC-10-D 27

Table 4 Components for Model 2, Serial 1 Resistors Quantity Resistance Wattage 1 5.6 k 1/2 w 3 10 k 1/2 w 3 47 k 1 w 1 56 k 1/2 w 3 68 k 1/2 w 1 82 k 1/2 w 2 100 k 1/2 w 9 100 k 1 w 1 150 k 1 w 3 220 k 1/2 w 1 270 k 1/2 w 2 330 k 1/2 w 1 330 k 1 w 2 390 k 1/2 w 2 470 k 1/2 w 1 560 k 1/2 w 1 680 k 1/2 w 2 820 k 1/2 w 6 1 meg 1/2 w 2 2.2 meg 1/2 w 1 2.7 meg 1/2 w 1 5 meg 2 w AB Pot. 2 22 meg 1/2 w 1 1k 5 w wire wound 1 15 k (with 2 taps) 10 w Dividohm Condensers Quantity Capacitance Rating 1 27 pfd 600 VDC ceramic 1 33 pfd 600 VDC ceramic 2 75 pfd 600 VDC ceramic 6 100 pfd 600 VDC ceramic 2 200 pfd 600 VDC ceramic 2 300 pfd 600 VDC ceramic 2 500 pfd 600 VDC ceramic 3 1000 pfd 600 VDC ceramic 1 0.01 [fd 400 VDC metalized 1 0.1 pifd 400 VDC metalized 1 1.0 pfd 200 VDC metalized 1 5,ifd 400 VDC metalized 3 30 pfd 450 VDC electrolytic Tubes Quantity Type 2 5V4 GA 2 12AT7 4 12AX7 2 GC-10-B 1 28 GC-10-D

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