CRIT Man CHICO NGL Features 1/2 in. sq., .5 Watt ATM MCHA CTE Palle Sq., BELA + Stackable - up to 8 modules + Switches - rotary, push-pull, push-momentary, multi position and schadow. * Small size - 1/2 in. square Versatility - various shaft, bushings, terminal styles, resistance values, tapers and tolerances Special Features . * Detents - single position or up to 16 positions in mechanical rotation; special detents available * Seals - mounting and shaft seals * Medium torque - | to 6 02. in. * Center tap - extra terminal + Tracking - laser trimming to keep two or more sections within a certain relational tolerance. Description + Phasing modules - electrically, mechanically, or both The 388 and 389 series are 1/2 in. square, modular, * Multi-turns - 3 1/2 and 5-turn styles stackable potentiometers. The basic construction suits the series for countless design options; over a billion * Clutch drive - independent adjustment of two configurations are available. The 388 and 389 series can modules, single shaft be found in a wide range of sophisticated systems ina broad scope of industries. * Push drive - shaft depressed to actuate pot. * Return to center - after shaft rotation (clockwise or counter clockwise), automatic return to center point Series 388 Electrical Specifications STC ma CaO eS ALES Resistance Range Linear: 100Q to 5 Megohms Linear: 5Q to 5 Megohms Tapered: 500Q to 2 Megohms Tapered: 100Q to 2 Megohms Resistance Tolerance Linear: thru SOOK& +10%; Linear: 10% standard; +5% special. above 5O00KQ +20%. Tapered: +10%. Tapered: thru lOOKQ 410%, Under 20 +20%. above 100K Q +20%. Taper See Charts A and B, page 9 for standard See Charts A and B, page 9 for standard and special tapers available. and special tapers available. Taper Tolerance +20% of nominal resistance at 50% +20% of nominal resistance at +50% +3% mechanical rotation mechanical rotation Independent Linearity +5% standard with specials available 5% standard with specials available End Resistance 402 maximum each end linear and low side 202 maximum each end 592 to 2.5KQ. of taper. 1% of total R. high side of taper. 4Q maximum each end above 2.5K Electrical Specifications continued, next pageElectrical Specifications continued Dynamic Noise (C.R.V.) Static Noise Power Rating Working Voltage Dielectric Withstanding Voltage Insulation Resistance Temperature Coefficient Tracking Electrical Rotation Effective Rotation Load Life Rotational Life Low Temperature Operation 1.5% of total R, standard linear; 1.0% of total R, special linear; 2.2% of total R, taper. Up to 30KQ - 20db; 100KQ - 12 db; 1 Megohms +3db. 0.5 Watt @ 70C bushing mounting. 0.25 Watt @ 70C PC mounting. Derate to 0 watts @ 120C. Derate 50% for non-linear tapers and derate multiple sections 1/2 wattage of pane] unit. 350 Vdc across end terminals, but power not to exceed rating. 750 Vac @ ATM pressure; 350 Vac @ 3.4 in. (86.36mm) Mercury. 1000 Megohms minimum for dry, clean conditions @ 25C See Chart C page 10. 10% voltage ratio tracking between sections standard. Specials available. 295 5 265 +5 without switch; 240 +5 with switch. Series 388 Operational Specifications 10% maximum change in resistance and within end resistance limits with rated power across element, at 70C ambient temperature. Power applied 1.5 hours on 0.5 hours off for 1000 hours. 10% maximum resistance change up to 50,000 cycles under load. Trimmer version 5000 cycles. Less than 3% change in total R. Operating torque at -40C is 30 oz. in. -55C available upon request. 3.0% of total R, standard linear; 1.5% of total R, special linear (500Q and above); 6.0% of total R, tapered. Up to 100Q - 25db; 10KQQ - 15db; 100KQ - 10db. 1.0 watt @ 85C bushing mounting. 0.5 watt @ 85C PC mounting. Derate to 0 watts @ 150C. Derate 50% for non-linear tapers and derate multiple sections 1/2 wattage of panel unit. 350 Vdc across end terminals, but power not to exceed rating. 900 Vac single standard module and 750 Vac all non-standard constructions @ ATM pressure; 350 Vac @ 3.4 in. (86.36mm) Mercury. 1000 Megohms minimum for dry, clean conditions @ 25C 15Q. to 100Q 250 ppm/*C. 10022 to 5 Megohms 150 ppm/*C. Temperature range -55C to 150C, 10% voltage ratio tracking between sections standard. Specials available. 295 +5 250 +10 -5 without switch; 225 +10 -5 with switch. Series 389 Operational Specifications 5% maximum change in resistance and within end resistance limits with rated power across element, at 85C ambient temperature. Power applied 1.5 hours on 0.5 hours off for 1000 hours. 25,000 cycles under load. Trimmer version 5000 cycles. Less than 2% change in total R. Operating torque at -40C is 30 oz. in. -55C available upon request.Low Temperature Storage Thermal Cycling Moisture Resistance Shock Vibration, High Series 388 Environmental Specifications Series 388 is designed to meet MIL-R-94 performance characteristics where applicable. Less than 2% change in total resistance Less than 4% total R change as a result of 5 cycles @ -55C to +120C 10% maximum total R change when tested per method 103 of MIL-STD-202 The total resistance setting change is 2% maximum between left and right terminals and 5% maximum between CCW terminal and center terminal when tested per method 213 condition I of MIL-STD-202. No intermittent contacts or open circuits Series 389 Environmental Specifications Series 389 is designed to meet MIL-R-94 and MIL-R-22097 performance characteristics where applicable. Less than 2% change in total resistance Less than 3% total R change as a result of 5 cycles @ -55C to +150C 5% maximum total R change when tested per method 103 of MIL-STD-202 The total resistance setting change is 2% maximum between left and right terminals and 5% maximum between CCW terminal and center terminal when tested per method 213 condition I of MIL-STD-202. No intermittent contacts or open circuits Frequency when tested per method 204 conditionC _ when tested per method 204 condition C of MIL-STD-202. Resistance setting of MIL-STD-202. Resistance setting change is 5% maximum between left change is 5% maximum between left (CCW) terminal and center terminal. The = (CCW) terminal and center terminal. The total resistance change is 2% maximum total resistance change is 2% maximum between left and right terminals. between left and right terminals. Washability Units may be adversely affected if Units may be adversely affected if subjected to conventional after-solder subjected to conventional after-solder board-wash. board-wash. Series 388 and 389 Mechanical Specifications Sears Mounting seal and shaft seal available for single shafts Body Size only. (Single module) .5 in. (12.70mm) square +.047 in. (1.19mm), except at standoffs Terminals Printed circuit style on 0.100 in. (2.54mm) grid in line, 0.250 in. (6.35mm) long. Spacing between terminals in multiple section controls 0.300 in. (7.54mm). Solder lugs formed from PC pins to accept three #22 AWG wires. Maximum PC terminal length .875 in. (22,23mm). Housing Molded thermoplastic Anti-turn Device Location | supplied unless otherwise specified. (See Chart D), Anti-turn Device radius is .250 in. (6.35mm). For options, see figure 5, page 10. Shafts Brass, nickel-plated, 1/8 in. (3.18mm) diameter standard. 1/4 in. (6.35mm) diameter optional. Concentric shafts 1/8 in. (3.18mm) outer shaft and 0.078 in. (1.98mm) inner shaft and 1/4 in. (6.35mm) outer shaft and 1/8 in. (3.18mm) inner shaft. Other shaft diameters available on special order. Caution: These units not designed to meet boardwashing requirements. Medium Torque Medium torque option available, single shaft controls. 1 oz. in. minimum to 6.0 oz. in. Mechanical Rotation With or without switch, 295 +5, With push-pull or momentary switch, 310 (inc. 10 backlash). Rotary switch with push-pull or momentary switch, 42 maximum. (Plus 30 for added detents) Push-pull or momentary switch, 12 maximum. Multi-position rotary switch, 30 per detent, +12 maximum. Shaft Pull Force 125 in. (3.18mm) diameter shaft: 18 Ibs. .250 in. (6.35mm) diameter shaft: 10 Ibs. Pot/BJ or BJM: 7.5 Ibs. Clutch: 20 Ibs. Pot/AJ/BJ or BJM: 10 Ibs. Concentric Rear Shaft: 7.5 lbs. Shaft End Play .020 in. (0.51mm) maximum Mechanical Specifications continued, next pageMechanical Specifications continued Shaft Radial Play .028 in. (0.71mm) maximum 1 in. (25.4mm) from mounting surface with 250 in. (6.35mm) diameter bushing. Actuating Forces Pot/BJ: 10-22 oz.; Dual Pot/BJ: 10-25 oz.; Pot/BJM: 25-40 oz.; Pot/Pot/BJM:25-43 oz.; MTorque Pot/BJM: 25-45 oz.; Reverse BJM: 25-40 o2z.; Clutch Pot: 15 oz. maximum; Disc Clutch/BJM: 45 oz. maximum. Tap Terminal Strength 18 lbs. maximum pull Bushing Diameter 1/4 in. (6.35mm) x 32NEF-2A standard 3/8 in. (9.53mm) x 32NEF-2A optional. When using 3/8 in. diameter bushing, distance from mounting surface to PC terminals is .170 in. (4.32mm) See page 12. Bushing Length Plain: 1/4 in. (6.35mm) or 3/8 in. (9.53mm) Split-locking style: 3/8 in. (9.35mm) Operating Torque 0.2 to 3.0 oz. in. for single and dual concentric controls. Duals 0.3 to 3.5 oz. in. Triples 0.5 to 4.5 oz. in. Quads 0.5 to 5.5 oz. in. Variation within a control | oz. in. maximum. Stop Torque 3 Ib. in. single shaft 2 Ib. in. dual concentric shaft Hardware Mounting hardware available. a. Hex mounting nut 1/4 in. (6.35mm) x 32 thread, 5/16 in. (7.94mm) across flats, 1/16 in. (1.59mm) thick. b. Internal tooth lockwasher 13/32 in. (10.32mm) OD x .025 in. (0.64mm) thick. c. Jam hex nut 5/16 in. (7.94mm) across flats, 5/32 in. (3.97mm) thick supplied with locking type bushings. Marking Consisting of customer part number or Clarostat part number, EJA source and date code. Ink stamp meets EIA RS-230 and RS-327. Figure 1 Chart A 100 L @ Ly % RESISTANCE 8 ~~ | Curves Standard The "S" taper is linear, the change in resistance value being directly proportional to the degree of rotation. It can be used either as right- hand or left-hand taper. The "Z" taper attains 10% resistance value at 50% of clockwise rotation (left-hand). The reverse "Z" taper attains 10% resistance value at 50% of counter- clockwise rotation (right-hand). For conformity and special output curves, consult Factory. Figure 2 Chart B 100 o_t\ J % RESISTANCE s ss Y I * V7 ANN 10 Z Za Sd Cy Nn % ELECTRICAL ROTATION CLOCKWISE Curves Special The W" taper attains 20% resistance value at 50% of clockwise rotation (left-hand). The V" taper attains 20% resistance value at 50% of couterclockwise rotation (right-handed). The reverse "T" taper attains 30% resistance value at 50% of couterclockwise rotation (right-hand). The "M" taper is such that a "W" taper is attained from either the | or 3 terminal to the center of the element.Figure 3 Chart C Nominal |Maximum Percent Temporary Resistance Change From 25 istance | -55C | -40C | OC | +25C | +85C | +105C) +120C 100 Ohms | +5.0 | +4.0 | +15 0 tL5 | 42.0 | 43.5 10k Ohms | +7.0 | +5.5 | +20 | 0 +15 | +25 | +5.5 100k Ohms| +8.0 | +6.0 +2.5 0 42.0 | 43.5 | +6.0 1 Megohm | +10.0 | +8.0 +3.0 | 0 42.5 +4.0 | +7.5 For Non-linear Tapers, Multiply Chart Values By 1.25 Chart D LOCATING PIN OPTIONAL ou | OPTION 1 LOCATING PIN 1 STANDARD 7 OPTION 2,3,4 LOCATING PIN 2 OR 3 OR 4; SPECIFY LOCATING PINs OPTION 5 LOCATING PIN 1 AND 2 ' 250 [8.36mm] STANDARD if [lk | OPTION 6 LOCATING PIN 3 AND 4 OF aon OPTION 7 NO LOCATING PIN 437 111.10mm lL fit 305 [7.75mm I 4 s99 4 , LOCATING EAR LAYOUT +LOCATING PIN POSITION OPTIONAL Figure 4 Figure 6 / Series AJ Switch: Rotary Style Series CJ Switch: Rotary, Multi-Position Style ame] + Peenp THREE POSMON USE TERM 1-5-3-2 it FOUR POSMON USE TERM 1-4-6-3-2 tbs FIVE POSITION USE TERM 1-4-5-6-3-2 7 ood TERMINAL TYPES: pe C fre, } 750 [19.05mm] MAXIMUM. LENGTH sagt | gap L woop PREFIX SWITCH WITH DESIGNATION "B FOR BUSHING MOUNTING 1 3 FigureS ss sti(isSOCS Figure 7 Series BJ Switch: Push-Pull or Push Momentary Series DJ Switch: Push Momentary ea | (ip) 1 [odtner] 1] [Som | eo Switches continued, next page 10Switches continued Figure 8 Series Schadow Switch: Momentary This series of switches may be attached to 388/389 modular assembly and may be operated by a single shaft or by the inner shaft of a concentric shaft assembly. Shaft lengths of assemblies employing the use of the BJ, Figure 9 Series AJ CHARACTERISTICS wi OeTeT BOSTON | _aRRNRCEMENT RATING [SPST AT TERMINAL 23 Ray Sara S25. OTDM AT TERNAL 75 = 2 125MA 2aDC S.P.DT. DETENT AT TERMINAL #1 Se 1.23 125MA 28VDC o! S.P.D.1. DETENT AT TERMINAL #3 a 1,23 125MA 28vDC POM ee ee ? 1,23 125MA 28VDC Series BJ P.D.T. SWITCH, ae a | 1-2 3-4 | 250MA 30VDC | Series BJM [Ba Dy, SWITCH, | ot | 1-2 3-4 | 250MA 30VDC | Series CJ Multi-Position Switch Electrical Specifications The switch may be assembled to almost any standard control style as either the panel or rear section. CJ switches are single pole single deck with from 3 to 5 positions plus common terminal, and have a 30 degree throw angle with mechanical stops. Rating 125ma 28Vde (dry circuit) Dielectric Strength 300 Vac between terminals. 750 Vac at atmospheric pressure, for one minute, terminals to ground. Insulation Resistance 1000 MegQ minimum Operating Temperature -40C to +120C Rotational Switch Life 25,000 cycles at 3 position derated to 20,000 cycles at 5 position. See figure 10. 11 Series CJ Multi-Position Switch Mechanical Specifications Mechanical Rotation 3 position is 60 4 position is 90 5 position is 120 Detent Each detent angle is 30 +3 Detent torque is 2.5 to 6.5 oz. in. @ S.C. Detent position is balanced at mid position on the switch. Terminal PC style, front or rear and solder hook. From 3-5 tap position terminals plus a common terminal. Figure 10 Series CJ: Multi Position Switch 3 POSITION 4 POSITION 5 POSITION YX So + AYA, DK, Series DJ Dome Switch Specifications The dome switch is a push momentary action type modular assemble that will fit most 388/389 modular assemble controls. Switch Type S.P.S.T., Term 1 #F Term 2 Contact Rating 125ma @ 28Vdc Mechanical Life 25,000 actuations Contact Resistance Less than 10Q Insulation Resistance 1 x 10Q Dielectric Strength 750 volts to ground 300 volts across terminals Operating Temperature -40C to +100C Operating Force 12 oz nominal Length of Throw .015 (0.38mm) nominalFigure 11 Series Schadow SCHADOW SWITCH - SINGLE OR CONCENTRIC SHAFTS SWITCH FUNCTION LU DM. MOMENTARY 1.905 2 POLE PUSH-PUSH DT [48.39mm] MOMENTARY 2.337 4 POE PUSH-PUSH DT [59.36mm] MOMENTARY 2.849 6 POLE PUSHPUSH DT [72.36mm] MOMENTARY 3.321 8 POLE PUSH-PUSH DT [84.35mm] RATINGS ALL TYPES RESISTIVE LOAD 500MA @ 100VAC 200MA @ 250VAC 1.0MA @ 25VAC 12 Series 388/389 Bushings Figure 12 .250 (6.35mm) Diameter Bushing, Plain Shaft BUSHING LENGTHS: 187 [4.75mm], .250 [6.35mm] STANDARD, 5 [9.53mm], 500 [12.70mm] Figure 13 .375 (9.53mm) Diameter Bushing, Plain Shaft aes i | "WK BUSHING LENGTHS: .250 [6.35mm], .375 [9.53mm], 500 [12.70mm] Figure 14 .250 (6.35mm) Diameter, Locking Bushing i il "x BUSHING LENGTHS: .375 [9.53mm] STANDARD, .500 [12.70mm] Figure 15 .375 (9.53mm) Diameter, Locking Bushing a "x BUSHING LENGTH: 375. [9.53mm] STANDARDSeries 388/389 Shafts Figure 16 125 +.001 (3.18mm +0.03) Diameter, Slott nae {/- ed Shaft 031 +010 (0.7mm) +925] ~ Ee {Orem 0.18] Figure 20 .078/.125 (1.98/3.18 mm) Diameter, Concentric Shafts MOUNTING SURFACE 125 +.001 [318mm tons} 5" 1.98mm ONLY PLAIN ENDINGS AVAILABLE Figure 17 -250 +000/-.002 (6.35mm +0.00/-0.05) Diameter, Slotted op a Eee 0.13] Figure 18 -125 +.001 (3.18mm +0.03) Diameter, Flatted Shaft a ray cist) a (30mm 0.05} * FLAT LENGTHS OPTIONAL "250 (6.35mm) Diameter, Flatted Shaft i Bask =. * FLAT LENGTHS OPTIONAL Figure 21 -125/.250 (3.18/6.35 mm) Diameter, Concentric Shafts : menage ONLY PLAIN ENDINGS AVAILABLE Series 388/389 Shafts and Bushings Figure 22 Trimmer Shaft and Bushing 35/64 +1/e6+] [13.80nm] 7 | ia (18 Gen 4 PT (Samy BUSHINGLESS TRIMMER CONTROL 13Series 388/389 Potentiometer and Rotary Switch Fractions: +1/64 in. (0.14 mm) except as specified Decimals: +.005 (0.13mm) except as specified Grids: +.010 Figure 23 Series 388/389 B-22 Printed Circuit Terminals MOUNTING SURFACE [it Mires 30.7) Ti bis Lesa) pon See t tH i q HH i 1 q Ht i | i ttt fi | T 34 u = " t r- 014 ft Sere ro 1 ' 1 bata pat pee DIAGRAM FOR SINGLE, DUAL, TRIPLE, QUAD OR SWITCH COMBINATIONS Figure 24 Solder Hook Terminals Sect tities) Let Ree SES eeN, a ==-4 &- ( DIAGRAM FOR SINGLE, DUAL, TRIPLE, QUAD, 00 OR ROTARY SWITCH COMBINATIONS 4 kiyempt Figure 25 B-24 Support Plates Suche far) i -e- we, 4. ' haz | a PC BOARD LAYOUT *e "Cc TYPE SUPPORT PLATE TERMINAL .015 B-24-1 3/8 [9.35mm 250 saser| STANDARD B-24-2 1/2 [12.70mm 375 [9.53mm B-24-3 5/8 [15.88mm 500 ean | B-24-4 3/4 [19.05mm 625 [15.88mm B-24-5 .275 [6.98mm 125 [3.18mm B-24-6 19/64 [7.54mm 175 [445mm B-24-7 7/16 [11.11mm 315 [8.00mm B-24-8 9/16 [14.28mm .425 [10.80mm] Combinations continued, next page 14Series 388/389 Combinations continued Figure 26 Mini-PV Connector Terminals Figure 28 Printed Circuit Layout Type C-17/C-17-1, with No. 2 Tap Terminal i iad =- | _T felhe worms wear . TF | the Zz [7.2mm] DIAGRAM FOR SINGLE OR ROTARY SWITCH Sy DIMENSIONAL TOLERANCES BASIC DIMENSIONS IN INCHES is DIMENSIONS SHOWN IN BRACKETS ARE IN MILUMETERS FRACTIONS: +1/64 [0.14mm] EXCEPT AS SPECIFIED DECIMALS: +.005 [0.13mm] EXCEPT AS SPECIFIED GRIDS: +.010 [0.25mm] *A = .275 .015 TO .600 MAXIMUM. PC BOARD LAYOUT [6.99mm +0,38] TO [15.24mm] DRAWINGS ARE NOT TO SCALE TYPE "A DIMENSION c-17 125 [3, C-17-1 500 ann 32 [son Figure 27 Figure 29 Printed Circuit Layout Type A-23, with No. 2 Tap Terminal [eden | [Vide] | [ato] | ms | __ tear par| (aera, b | oa [2S] Printed Circuit Layout Type A-18 7 PC BOARD LAYOUT Combinations continued, next page 15Series 388/389 Combinations continued Figure 31 Figure 30 Printed Circuit Layout Type C-8 Printed Circuit Layout Type A-19 | | ft ] - [3.16] | | 4b pate t paar pam | Sout t tt 100 mene eb PC BOARD LAYOUT PC BOARD LAYOUT Figure 32 Printed Circuit Layout Type A-20/A-21/C-14 Combinations continued, next page 16Series 388/389 Combinations continued Figure 34 Figure33 Printed Circuit Layout Type C-10 Printed Circuit Layout Type C-9 Figure 35 Figure 36 Printed Circuit BBJ (BBJM) Switch Layout Type A-22 _ Printed Circuit BBJ (BBJM) Switch Layout Type C-15 Bea oe PC BOARD LAYOUT Combinations continued, next page 17Series 388/389 Combinations continued Figure 39 Figure 37 Potentiometer and BJ (BJM) Switch Printed Circuit Printed Circuit BBJ (BBJM) Switch Layout with Standard Layout Type A-18 PC Terminals ra MOUNTING SURFACE Lies inal ton) AVAILABLE WITH SINGLE OR PC BOARD LAYOUT PC BOARD LAYOUT CONCENTRIC SHAFTS Figure 38 Figure 40 Pot or AJ Rotary Switch and BJ Push-Pull or BJM Potentiometer and BJ (BJM) Switch Printed Circuit Momentary Switch with Standard PC Terminals Layout Type C-11 _ we | jab 7 * NOTE: FOR CONCENTRIC SHAFTS HEIGHT DIMENSIONS bag 57 nso) 1] Sy Te ll I wane | er) 2015 | i Pc BOND ' ii bea | it | (alto | nar] _ Ch ' [21.4mm] ! {22 S0me) b . ea gu .foemels \ [item] | [7c] tL 4 Syme AAEY TT atthe TT tre | [10.4 toa ert t+ C et ont Simi ---- - a PC BOARD B28 STANDARD 0 TERMINALS eat PC BOARD LAYOUT B-29 WITH SUPPORT PLATES AVAILABLE WITH SINGLE OR NOTE: THIS STYLE AVAILABLE WITHOUT FRONT . oom SECTION. OVERALL DIMENSION 51/64 [20.24mm]. Combinations continued, next page 18Series 388/389 Combinations continued Figure 41 Potentiometer and BJ (BJM) Switch Concentric Shaft Operation Only with Standard PC Terminals PC BOARD LAYOUT B-30 STANDARD TERMINALS B-31 WITH SUPPORT PLATES Series 388/389 Multi-Turns Series 388/389 Detents Figure 42 Figure 43 Three or Five Turn Vernier Type with Detent, Valley Style with Standard PC Terminals Standard PC Terminals (ein tt 5 MOUNTING SURFACE a] sre [25ten) > \.-- @-- hot | a fm > PC BOARD LAYOUT gir, B-52 STANDARD TERMINALS rach PC BOARD LAYOUT aelig B-53 WITH SUPPORT PLATES B-50 STANDARD TERMINALS es B-51 WITH SUPPORT PLATES 19Series 388/389 Push Drive SUSE T Mie me Hm eens Figure 46 Clutch Drive with BJM and Standard PC Terminals Figure 44 Push Drive with Standard PC Terminals ere SURFACE B-22 STANDARD TERMINALS B-34 WITH SUPPORT PLATES CLUTCH DRIVE POTENTIOMETER WITH BJM MOMENTARY SWITCH INDEPENDENT ADJUSTMENT OF FINE OR COARSE MODULES UTILIZING A SINGLE SHAFT FUNCTION. Figure 45 Push Drive Control with BJM Momentary Switch and Figure 47 Clutch Drive with AJ and Standard PC Terminals Standard PC Terminals s A epi se it ts aSeries 388/389 Clutch Drive continued Figure 48 Special Clutch Drive with Standard PC Terminals | Att LT) fg I od bees ae] , + Ta I} ker] || aie 4 ieee] ou weneceas w aeioe TS ae - LF 4 PC BOARD LAYOUT B=46 STANDARD PC TERMINALS B-47 WITH SUPPORT PLATES Series 388/389 Center Return Style at) (UML ACTaeed MLDS Center return is a mechanical device that will fit on the rear of most potentiometers providing spring load return to center action when shaft is released. Mechanical Rotation 80 + 10 -5 each side of center. Spring return to center. Other angles less than 80 are possible. Operating Torque .75 to 1.5 02. in. Stop Torque 2 Ibs. in. Backlash 2 maximum Operating Life 200,000 cycles Resistance Track May be matched to mechanical rotation angle if required. Figure 49 A Single Control, with a Return-to-Center Module Mounted on Rear #1/4 OR 3/8-32-48F-24, THREAD un ST Lb <= r 1245 [3.10mm) DIAMETER J [Bitomnd | | dL ae Lat RUA M LVL fm Cers Tel OLIN Figure 50 Potentiometer or AJ Rotary Switch (BJ) Push-Pull or (BJM) Momentary Swtich and Standard PC Terminals pi T" Ln PC BOARD LAYOUT B-32 STANDARD PC TERMINALS B33 WITH SUPPORT PLATES imac ton) Muiti-Sections continued, next page 21Series 388/389 Multi-Sections continued Figure 51 Pot/Pot/BJ or Pot/BJ/BJ with Standard PC Terminals a ea PC BOARD iets | | Hote u i 18mm] || | | | ip ot hil Lobe ' ' | ' | wend | | | | o con ie (25.stnn) | | L | 7: [imn] | 4 3 mars . Ltt | ttt gop ee Wl B-48 sonia c hawt? racket Ton B49 WITH SUPPORT PLATES A Single Unit Consisting of 4 to 8 Control Modules Operated by a Single or Concentric Shafts sane