Tektronix Lawn Mower TM 5003 User's Manual
Contents
1. Section 1 TM 5003 SPECIFICATION Instrument Description The TM 5003 is a three compartment power module compatible with TM 500 5000 series plug ins The power module features a pulse width modulated switching dc pow er supply All dc voltages are regulated The unit has forced air cooling Three individual connectors one for each compartment provide connections to each GPIB compatible plug in These connectors feed to a GPIB interface board then to a standard GPIB connector on the rear panel All GPIB con nections are separate from the board rear interface connector Performance Conditions The electrical characteristics in this specification are valid only if the TM 5003 has been adjusted at an ambient tem perature between 20 and 30 instrument must be in noncondensing environment whose limits are de scribed under the environmental part Allow 30 minutes warm up time for operation to specified accuracy 60 min utes after exposure to or storage in a high humidity con densing environment Any conditions that are unique to a particular characteristic are expressly stated as part of that characteristic The electrical and environmental performance limits to gether with their related validation procedures comprise a complete statement of the electrical and environmental per formance of a calibrated instrument Items listed in the Performance Requirements column of the Electrical Characteristics2. RH to 50 Altitude Exceeds MIL T 28800B class 5 Operating 4 6 Km 15 000 ft Non operating 15 Km 50 000 ft Vibration 0 38 mm 0 015 Meets MIL T 28800B peak to peak 5 Hz to class 5 55 Hz 75 minutes Shock 30 g s 1 2 sine Meets MIL T 28800B 11 ms duration class 5 3 shocks in each direction along 3 major axes 18 total shocks Bench Handling 12 drops from 45 Meets MIL T 28800B 4 or equilibrium which class 5 ever occurs first Transportation Qualified under National Safe Transit Association Preshipment Test Procedures 1 1 and 1 2 EMC Within limits of MIL 461A tests REO2 01 CEO3 501 CS01 C802 and VDE 0871 Electrical Discharge 20 kV maximum charge applied to instrument case Electrical load in accordance with Section 2 2 1 bSystem environmental specifications subject to individual plug in specifications lt Tested with mechanical load of 9 5 ibs 1 2 Ib evenly distributed A three wide plug in with three rear support pins and two rear interface ECB s Requires retainer clips Without mechanical load plug ins 14 REV SEP 1981 Specification TM 5003 Table 1 3 PHYSICAL CHARACTERISTICS Characteristics Description Maximum recommended plug in weight One wide Two wide 3 lbs 1 4 kg 6 Ibs 2 7 kg Net weight without plug ins 19 lbs 8 6 kg Maximum overall dimensions Height 193 8 mm 7 63 inches Width 2
3. 5003 front view Save and reuse the package which your instrument The carton test strength for this instrument is 350 was shipped If the original packaging is unfit for use or not pounds per square inch available repackage the instrument as foliows Stacking and Rackmounting Surround the instrument with polyethylene sheeting to TM 5003s with their cabinets and feet in place may be protect the instrument finish Obtain a carton of stacked on top of each other Give adequate spacing for the corrogated cardboard of the correct carton strength necessary ventilation having inside dimensions of no less than six inches more than the instrument dimensions Cushion the in strument by tightly packing three inches of dunnage The TM 5003 is designed to be half rack width Field con or urethane foam between carton and instrument on version kits with slide out tracks are available to mount one all sides Seal the carton with shipping tape or an in or two TM 5003s or a TM 5003 and other instruments in a dustrial stapler standard 19 inch rack Vertical space needed is 7 inches Operating Instructions TM 5003 POWER MODULE Barrier Top 1 EA Groove Bottom Groove Fig 2 4 Plug in installation and removal m Ane Fig 2 5 Keying assignments for family functions One of many possible sequence combinations THE FOLLC UCTIONS ARE _ FOR USE ONNEL ONLY TO OID P
4. are verified by completing the Performance Check in the Calibration section of this man ual Items listed in the Supplemental Information column are not verified in this manual Table 1 1 ELECTRICAL CHARACTERISTICS Characteristics Performance Requirements Supplemental information Supplies 26 V di Tolerance 23 7 V to 28 3 V u PARD lt 2 5 V peak to peak Maximum load per compartment di Maximum load d 10 mA us 26 V dc Tolerance 23 7 V to 28 3 V PARD lt 2 5 V peak to peak Maximum load 1 A per compartment Maximum load a dt 10 mA us 1 1 Specification TM 5003 Table 1 1 cont Characteristics Performance Requirements Supplemental Information 8 V dc Tolerance 7 6 to 8 5 V lt 600 mV peak to peak Maximum load 3 A per compartment Maximum load dt 20 mA us 25 V 2 each compartment Range 25 0 V rms 10 15 floating Maximum load 1A rms per winding Maximum floating 350 V peak from chassis voltage ground 17 5 Range i 20 5 V 1096 20 with grounded center tap Maximum load 350 mA per compartment Maximum plug in power draw from mainframe 30 watts dc or 50 VA ac Combined power draw Sharing Limitation 2 97 wattsg 700 Series Pass Transistors Type One NPN and PNP per compa
5. create an electric shock hazard For electric shock protection the grounding connec tion must be made before making connection to the instrument s input or output terminals See Fig 2 1 Refer to the line voltage and fuse data label on the rear panel caurion To ensure proper cooling do not operate power module with any cover removed Fuse Replacement Turn the slotted section of the line fuse holder counter clockwise and remove the fuse Replace the fuse with the proper type as shown on the rear panel label Table Top Use The power module may be operated with the front raised To raise the front of the instrument extend the front feet as shown in Fig 2 2 Plug In Installation and Removal Turn the power module off before inserting or remov ing the plug in otherwise damage may occur to the plug in circuitry NOTE The DC 505 DC 505A and LA 501W plug ins are not compatible with this power module Check to see that the plastic barriers on the interconnecting jack of the selected power module compart ment match the cutouts in the plug in circuit board edge connector Align the plug in chassis with the upper and low er guides see Fig 2 3 and 2 4 of the selected compart ment Push the plug in chassis in and press firmly to seat the circuit board edge connector in the interconnecting jack Turn the power module on Operating instructions TM 5003 Rear interface bnc connectors Option 02 onl
6. turned on C1730 and C1831 charge to the voltage at pin 8 of U1620D as determined by R1820 and R1830 This takes approximately 1 2 second The power limit control is R1830 For maximum power this control must be in the full clockwise position maximum resistance For servicing the control can be adjusted for reduced power output levels This is accomplished by reduc ing the resistance of R1830 limiting the voltage across C1730 and C1831 The purpose of U1600A is to vary the on time of the output transistors consistent with the output voltage level When pin 6 of U1600A goes high pin 1 also goes high This action shuts down the base drive circuitry reducing power output The length of time pin 6 remains high is con trolled by the Output Regulator circuitry The rising portion of the waveform at pin 4 of U1600A resets the flip flop for a low condition at pin 1 Flip flop U1600B divides the 40 kHz output waveform from U1720B to 20 kHz The pulse from the dead time multivibrator 917208 is applied to the clock terminal pin 11 of U1600B The terminal of 416008 is connected to its D input The multivibrator U1600B toggles on the rising edges of the dead time multivibrator 01720 output Output Regulator The 40 kHz clock oscillator which provides the basic tim ing necessary for the control circuitry is composed of U1620A and C Feedback occurs from pin 6 of U1620C and pin 4 of U1620B to pin 1 of U1620A The ou
7. works C1401 and R1400 for Q1301 and C1411 and R1410 for Q1300 A series resonant filter between the transistors and the output transformer T1210 is composed of C1320 and L1200 During Q1300 and Q1301 off time the tank cur rent generated by L1200 and C1320 passes through CR1302 and CR1300 The 20 kHz output voltage is stepped down to the cor rect levels by T1210 Three sets of full wave diode rectifiers are provided for each of the three dc voltage outputs Schottky diodes are used in the 8 V supply for reduced forward voltage drop All filters are L C pi sections Bleeder resistors are provided for all filter capacitors Control Logic and Drivers lt gt U1620E and U1620F inverting amplifiers Their out puts control the base drive transistors Q1401 and Q1400 Collector voltage for these transistors is applied from the 10 V bus through a center tapped winding on the base drive transformer T1430 Reverse polarities across Q1401 or Q1400 are prevented by CR1501 and CR1500 When either one or both of these transistors Q1730 Q1731 are on either one or both of the output transistors Q1300 Q1301 are off The bases of Q1400 and Q1401 are also controlled through R1511 and R1520 by the collector of Q1650 Dur ing power up or power down the collector of Q1650 goes positive This action turns Q1401 and Q1400 on to turn the output transistors off This is necessary as the control cir cuitry is undefined during power up o
8. 29 84 mm 9 049 inches Length 476 mm 18 74 inches Enclosure type and style per MIL T 28800B Type Style E with 040 rackmount kit style F Finish Frame Powder coated aluminum Covers Vinyl clad aluminum e 1 5 Section 2 TM 5003 OPERATING INSTRUCTIONS Introduction The TM 5003 Power Module is calibrated and ready for use when received A list of standard accessories and part numbers is located in the back of this manual Power Source Requirements WARNING Power Source and Connection This instrument operates from a single phase power source It has a three wire power cord and two pole three terminal grounding type plug The voltage to ground earth from either pole of the power source must not exceed the maximum rated operating voltage 250 volts Before making connection to the power source deter mine that the instrument is adjusted to match the volt age of the power source and has a suitable two pole three terminal grounding type plug Refer any changes to qualified service personnel Grounding This instrument is safety class equip ment IEC designation All accessible conductive parts are directly connected through the grounding conductor of the power cord to the grounding contact of the power plug The power input plug must only be inserted in a mat ing receptacle with a grounding contact Do not defeat the grounding connection Any interruption of the grounding connection can
9. ERSONA O NOT PERFORM ANY ICING OTHER THAN THAT CONT TING INSTRUCTIONS UNLESS TO DO SO Section 3 TM 5003 THEORY OF OPERATION Introduction For ease in understanding this description refers to the schematics located in the pullout pages at the rear of this manual Also refer to the block diagram located in the pullout pages and the timing diagram in Fig 3 1 Each block in the block diagram is outlined on the schematics The TM 5003 uses a pulse width modulated switching supply for dc voltages A 60 Hz transformer provides the ac voltages necessary for plug in operation Connections to the six plug in compartments as well as the series pass transistors are shown on schematic 5 Line Selector and 60 Hz Transformer lt gt Ac power is applied to the voltage select terminals through FL500 and a discrete line filter composed of T1000 L1000 and L1100 Line transients are filtered to ground through C1000 and C1100 The two primary windings on T500 are connected in par allel for 115 V operation or in series for 230 V operation Winding taps are provided for various line voltages around the nominal values The secondaries provide ac voltages to the various plug in compartments Rectifiers and Filters lt gt The ac line voltage is applied through negative tempera ture coefficient resistances RT1020 and RT1110 to the rec tifier diodes As these resistances are highest when cold the surge currents chargin
10. Tektronix COMMITTED TO EXCELLENCE PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL INSTRUCTION MANUAL Tektronix Inc P O Box 500 Beaverton Oregon 97077 070 2955 00 First Printing JAN 1981 Product Group 75 Revised DEC 1981 Serial Number gs 2 2 O 2 272 o a 20 2 AN i oo _ jes are reserved 5 a a 2 2 2 S 1 a 2 nn jn _ TM 5003 SERVICE SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the preceding Operators Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this prod uct unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On Dangerous voltages may exist at several points in this prod uct To avoid personal injury do not touch exposed connec tions and components while power is on Disconnect power before removing protective panels sol dering or replacing components Power Source This product is intended to operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation TM 5003 2955 00 TM 5003 Power Module
11. connect to U1720B the dead time multivibrator Input pins 4 and 1 connect to the output of the stop monostable U1600A Pins 2 and 9 connect to the complement outputs of the divide by 2 flip flop U1600B With any one or ail of these inputs high the output lines are low and no drive is applied to one or both of the output transistors The dead time multivibrator circuitry determines the mini mum off time of the output trtansistors Dead time is neces sary to allow one output transistor to completely turn off before the other turns on At start up the A input pin 12 of U1720B goes low This allows U1720B to trigger on the clock signal at the B input pin 11 The minimum timing period of U1720B determined by R1610 and C1700 is 5 us This pulse width is lengthened by C1710 CR1710 and CR1711 as the voltage on C1730 and C1831 is decreased The pulse width of the power supply output varies for soft start and power limit When pin 10 of U1720B is high both Output transistors are off Dead time or output transistor off time is maximum with C1730 and C1831 discharged and minimum charged The output power available gradually increases as these capaci tors charge during soft start The soft start prevents high input currents to capacitors from damaging circuit compo nents When pin 6 of the wait multivibrator U1720A goes high for any reason fault pin 8 of U1620D goes low dis charging C1730 and C1831 Under normal operation when power is
12. ected from a negative voltage by CR1840 Primary current in output transformer T1210 flows through T1000 The secondary voltage of T1000 is proportional to the primary current The secondary volt age of 71000 is rectified by CR1511 CR1512 CR1502 and CR1510 and terminated in 1510 When the primary current in T1000 exceeds a predetermined limit the voltage at pin 6 of U1540B exceeds the 7 15 V reference at pin 7 Pin 1 goes low turning off the output transistors via the wait multivibrator The 26 V is applied through R1462 and CR1451 to pin 8 of U1540C the positive overvoltage detector The 8 V is also applied through R1453 and CR1450 to pin 8 Pin 9 of comparator U1540C connects to the 7 15 V reference voltage If pin 8 of U1540C goes more positive pin 14 goes low This action triggers U1720A the wait multivibrator turning the supply off for about 3 seconds The soft start cycle follows The negative going pulse from U1540C is time delayed by R1840 and C1830 When 10 V is applied at power up C1630 holds pin 3 clear of U1720A low for a short period This overrides the A and B inputs of U1720A causing pin 6 the output to remain low Overvoltage or overcurrent causes a low at pin 4 of U1720A causing one high level pulse of about 3 sec onds duration at pin 6 This 3 second pulse duration time is 34 determined by C1620 and R1720 The clock pulse retriggers U1720A if the fault persists The purpose of CR1730 is to disc
13. g the high voltage capacitors when line voltage is applied are limited thus preventing component failure These resistors then self heat to a low resistance In 220 V operation the four diodes function as a bridge rectifier See Fig 3 2 When the voltage select circuit is set for 110 V operation only the two series diodes operate The circuit then becomes a voltage doubler with an output of approximately 350 V dc The neon bulb in this circuit flashes to indicate when dc voltage is present The rectified and filtered dc is applied through L1220 and C1210 a low pass filter and passes through R1210 and CR1303 to the collector of Q1301 20 kHz Output Stage lt gt The output stage is a half bridge type with proportional base drive The turns ratios and phasing of T1430 are such that only a small amount of base drive power is needed to start conduction in either Q1301 or Q1300 Positive feedback from T1430 supplies base current for the remain der of the power cycle When both base drive transistors Q1400 and Q1401 shown on schematic are saturated T1740 is essentially shorted terminating base current for either output transistor Output transistors Q1300 and Q1301 alternately conduct at a 20 kHz rate Their on and off times are adjusted by the regulation circuit ry Diodes CR1300 and CR1301 prevent base to collector current flow in Q1300 and Q1301 at turn off The base switching action of these transistors is improved by net
14. ge at pins 2 and 6 reaches 2 3 of the value of the voltage connected to pin 4 4 10 V Pin 7 of U1850 connects to the base of Q1125 This transistor inverts the signal from pin 7 to the plug in compartments When the line power goes low or off pin 13 of U1550 goes low This action raises pin 7 of U1850 turning off the PWR signal Pin 7 of U1720A is also low during the 3 sec ond wait state The cathode of CR1830 is pulled low which turns off the PWR signal The soft start feature also controls the PWR signal This is accomplished through R1821 When a fault occurs pin 6 of U1720A goes high When the fault is removed pin 6 of U1720A goes low causing pin 8 of U1620D to go high As the voltage at the junction of 81821 and 81820 goes high pin 6 and 2 of U1860 also go high causing the PWR signal to go high Theory of Operation TM 5003 Main Interface gt compartment Each compartment has a pnp and an npn transistor intended as series pass elements Connecting The various ac and de supply voltages as specified are pins to these elements are shown on the schematic available at the rear interface connectors for each plug in
15. harge C1630 when ac power is removed from the sup ply Noise from the limit circuitry is filtered by C1830 Control Circuit Regulator The 16 V c winding on T500 is applied through F1660 to rectifier diode 1561 which charges filter capacitor C1761 to approximately 20 V The 20 V is applied to voltage regulator U1550 This regulator outputs two voltages 10 V which is used throughout the entire supply and 7 15 V a reference voltage at pin 6 The line detector circuitry 15 composed of CR1560 C1851 Q1650 and associated components When normal line voltage is applied the voltage across C1851 is approxi mately 20 V Transistor Q1650 is on and pin 2 of U1550 is about 0 2 V above ground If about two cycles of line volt age are missed or the line voltage goes low Q1650 no long er saturates The collector of Q1650 rises disabling the series pass transistor located internally U1550 4 10 V is removed from the power supply during line drop out to prevent discharge of the main filter capacitors in the output stage Positive feedback is provided through R1750 to the base of Q1650 to improve the switching action The PWR signal circuitry U1850 provides a signal to each compartment in the power module to give power sup ply status information to the plug ins See the rear interface information part of the Maintenance section Section 50 of this manual for timning information Pin 7 of U1850 goes low when the rising volta
16. nnector to match the module s slot location An entire TM 5003 can be set up in this manner for specific work functions For extra barriers order Tektronix Part No 214 1593 02 Rear Panel The rear subpanel has a connector mounting plate for bnc and multipin connector mountings Customer or factory installed connectors and wiring Option 02 can provide external access to the interface This feature makes the TM 500 5000 Series Modular Instrumentation System very flexible in bench top or rack mounted systems Option 02 Qualified service personnel see Section 6 in the Service Section of this manual for information on Option 02 Repackaging Information If the Tektronix instrument is shipped to a Tektronix Ser vice Center for service or repair attach a tag showing own er with address and the name of an individual at your firm to contact Include the complete instrument serial number and a description of the service required REV SEP 1981 Operating instructions TM 5003 Air intakes Extended front Push to fold against bottom of instrument Carrying handle Folded front bail Pull to extend Fig 2 2 TM 5003 bottom view Operating instructions TM 5003 Clearance holes Plug in chassis ground connectors Internal digital bus connector Rear interface 2 connector i Plug in support rail Air intake Line power switch Collapsible Fig 2 3 TM
17. r power down 31 Theory of Operation TM 5003 l l 8 604 0 N 1 009611 8 a RN E NNNM NS aun peag N AS uos N 8 08810 01 4 1 1 V 307081109 0590 SER RR RR E RIDERE IEEE 5 ossin EL 088101 02 P eur 4 7295 296 49A0281 sdo1p eut ewou pausny JeMod Jaye our eur uo pau n Fig 3 1 Various waveforms and time relationships for power on off fault and low line e 32 AA J 220 V CR1120 input lt Full wave bridge rectifier for 220 V ac line Theory of 5003 These diodes do not operate in this mode 110 V ac input Voltage doubler for 110 V ac line Fig 3 2 Input line connections for 110 V and 220 V operation When pins 1 of U1610A and 13 of U1610B are low no drive is applied to the output stage With one gate output high and the other low base drive is applied to one output transistor Input pins 5 and 10 connect to the wait flip flop U1720A Input pins and 12
18. rtment Maximum dissipation 10 W each 20 W total Maximum floating voltage 350 V peak Source Power Requirements Voltage Ranges Selectable nominal 100 V 110 V 120 V 200 V 220 V and 240 V 250 V maximum on 240 V range Tolerance 4 796 10 Line Frequency 48 Hz to 60 Hz Maximum Power Consumption 300 VA 12 i i i Table 1 1 cont Specification 5003 Characteristics Performance Requirements Supplemental Information Fuse Data 100 V 110 V 120 V ranges 4 A 3 AG medium blow 200 V 220 V 240 V ranges 2 A 3 AG fast blow Miscellaneous Maximum recommended plug In power dissipation One wide 15 Two wide 35 W Recommended adjustment interval 1000 hours or 6 months Worst case Low line with full load and high line with no load These limits include PARD Periodic and Random Deviation See National Electrical Manufacturers Association NEMA Standards Publication No PY 1 1972 At nominal line voltage 1 3 Specification TM 5003 Table 1 2 ENVIRONMENTAL CHARACTERISTICS Characteristics Description Temperature Meets MIL T 28800B class 5 Operating 0 C to 50 C Non operating 55 C to 75 C Humidity 95 RH 0 C to 30 C Exceeds MIL T 28800B 75 RH to 40 C class 5 45
19. tput voltage at pin 4 of U1620B is high for about 4 us and low about 21 us This nonsymmetrical duty cycle is accomplished by CR1720 and is necessary for proper operation of U1720B 33 Theory of Operation TM 5003 The positive going output pulses from the clock oscillator charge C1450 to about 9 5 V through CR1610 When the positive pulse at pin 4 of U1620B drops to 0 V C1450 dis charges through R1452 causing a falling ramp waveform of about 50 mV peak to peak amplitude to appear at pin 4 of U1540A The 8 V from the power supply output is applied to voltage adjust potentiometer R1530 The voltage on pin 4 of U1540A is 7 15 V the reference voltage generated in U1550 Also on pin 4 is a negative going 40 kHz ramp as previously described This ramp is ac coupled to pin 4 through C1451 On the rising edge of each clock pulse the ramp goes positive rapidly Pin 2 of 15404 is low At some point during the ramp decay the ramp voltage and the feedback voltage at pin 5 are equal At this point pin 2 goes high terminating the drive pulse through the logic circuitry The higher the output voltage the earlier in the ramp cycle pin 2 goes high Overvoltage and Overcurrent Detectors lt gt Pin 11 of U1540D the negative overvoltage detector connects to a voltage divider between the 26 V supply and the reference 7 15 V Should pin 11 go more negative than pin 10 pin 13 goes low shutting off the output The input of U1540D is prot
20. y Rear interface connector Option 02 only Line fuse holder r I 2 Power cord receptacle 488 GPIB connector 2956 01 Fig 2 1 TM 5003 rear panel Family Compatibility Mechanically 500 5000 plug in modules are very similar to other Tektronix product families However they are not electrically compatible Therefore the TM 5003 in terface has barriers on the mating connectors between pins 6 and 7 to ensure that incompatible plug ins cannot be in serted See Fig 2 5 A compatible module will have a matching slot between pins 6 and 7 of its main circuit board edge connector This slot and barrier combination is the pri mary keying assignment TM 500 5000 compatible plug in modules are also identi fied by the white color of the release latch Customizing the Interface The modularity of this instrumentation system provides for many different functions to be performed by the plug in modules Specific functions are grouped into families or classes of which there may be several plug in module mem bers For instance some classes are Power Supplies Sig nal Sources Measurement and so forth Each module member of a functional family will have a second slot pecu liar to its family assignment located in its edge connector The TM 5003 user can select one or more compartments to accept only members of that family by installing a second 2 2 barrier in the interface co
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