U-Tech 681, Instruction Manual

Page 1: ...INSTRUCTION MANUAL U TECH CHARACTERISTIC CURVE TRACERS PLUG IN UNIT MODELS 681 and 602 CONSOLE MODEL 683 U TECH 4190 South State Street Salt Lake City Utah 84107 Phone 801 262 2663...

Page 2: ...RANTY U TECH warrants equipment of its manufacture against defective materials and workmanship for a period of one year from date of shipment COPYRIGHT 1968 Printed in the United States of America All...

Page 3: ...ring agency The U TECH Models 681 and 682 Characteristic Curve Tracers are both plug in units designed for use with Tektronix Oscilloscopes Type 560 series and Type 530 540 550 and 580 series respecti...

Page 4: ...the collector power supply Since the base generator is referred to ground the base current does not flow through this path therefore it is not indicated on the vertical display Base Terminal BLUE Thi...

Page 5: ...operating conditions this should not occur but if operated for prolonged periods 41 low voltage and high current a check for this small horizontal line with the voltage control off should be made at f...

Page 6: ...onnected because it is not connected internally The reason is that the plug in unit is already connected to ground through the third wire of the power supply in the main frame It is in fact undesirabl...

Page 7: ...from it VcEO can be obtained by reading the voltage at which the lowest curve No 3 passes through the specified current at which the breakdown is measured If while measuring this portion the set of c...

Page 8: ...curve tracer is misused or shorted externally d If no SPOT appears but a shadow shows on the top or bottom of the screen when the intensity is turned full up there is a bad component in the vertical a...

Page 9: ...ribed the unit is operating properly and any discrepancies can be cleared up by carefully following the calibration procedure 5 If this does not solve the problem contact a U TECH factory representati...

Page 10: ...OCEDURES If a calibrated X Y scope is available this first section A may be eliminated A OSCILLOSCOPE CALIBRATION 1 Calibration of the D C Oscilloscope a Set the power supply for exactly 1 0 volt outp...

Page 11: ...ope is peak so a conversion must be made to compensate for this difference B OPERATIONAL CHECK OUT 1 2 Set Model 683 front panel controls as follows a lc 1 ma cm b Rc 1K c lb 0 01 rna em d Polarity sw...

Page 12: ...ady for one hour ageing and stabilization prior to calibration 9 The sync control R66 should be adjusted so as to obtain a stable display Adjusting this control in both directions will reveal a manual...

Page 13: ...th dot extreme right dot intersects the 6 em line If the display is not completely stable it may be necessary to repeat the procedure described in paragraph 69 Steps 8 9 10 of section C cannot be perf...

Page 14: ...t PC 3 PC I PC 2 COMPONENT SIDE MODEL 681 r IT a_ PC 2 PC 3 COMPONENT SIDE MODEL 683 f PC I IR 8 l70 741 PC 2 PC 3 COMPONENT I I SIDE I MODEL 682...

Page 15: ...I r _I_ I L c I d 1 1 I l I I I I I L I ___________ J __ 1 1 L J m _ 17 I r n P I CD 1 0 Q II J lJ 0 0 lPL 1 u f r i...

Page 16: ...ment may be modular constructed as a plug in unit for certain types of standard oscilloscopes so as to make use ofavailable power electronic capability and display contained within such oscilloscopes...

Page 17: ...SITION 51 52 I I I I COLLECTOR II COLLECTOR LOAD ____ ___ _yg_BJ __8MP_ 8_ _ CU RENT_ SWI CH _ ___ R SISTgR S ITCH __j lr FIG I I T tl 38 II i I Df B 9 i lW 1 i R50 i R BASE I I R 47 j 0 DRIVE R B PO...

Page 18: ...0 j 5 Sheets Sheet 2 r 1 I I I I I z J Il Z E J rJ I I l I I Ill I I I I I I I I I I I I I I I I I I I I I ________________________r1rll_______j Ill I I I I I I I I I I I I I I I I I I I L J INVENTOR...

Page 19: ...971 3 573 618 v CURRENT 5 Sheets Sheet 3 FIG 4 FIG 5 S4 S3 0 50V DEF PLATES S4 S3 0 50V DEF PLATES FIG 6 FIG 7 S4 S3 50 IOOV DEF PLATES DEF PLATES 183 FIG B Is2 ls1 VOLTAGE H INVENTOR WILLIAM G DILLEY...

Page 20: ...Sheet 4 VOLTAGE FIG 9 VOLTAGE FIG 10 IME TIME FIG II FIG 12 STEP STEP t 2 STEPS C R T FIG 13 110 Volts A C 1 I I I I I I I I I I l BASE I DRIVE GENERATOR I INVENTOR WILLIAM G DILLEY I BY l___________...

Page 21: ...I II y f ___ 1 1 I 1 1 __ ____ 1 t r t t t I Nl 1 f 1 f 1 3 573 618 6 Sheets Sheet 5 1 1 1 f F 1 t 1 1 1 t 1 1 1 1 f r 1 1 1 f 1 1 1 11 1 1 C J r 1 r 1 r 1 1 l H 1 t 1 1 1 j 1 t 7 17 1 INVENTOR WILLIA...

Page 22: ...y mode or voltage range and polarity reversal is accomplished by switch means in the power supply circuitry The one terminal of the test sta tion is the ground plane voltage potential reference for th...

Page 23: ...and 12 2 volts respectively A positive voltage at terminal R 40 in conjunction with Rl provides a bias current for CRl 35 the transistor Q9 and ofsimilar devices being tested the base drive current is...

Page 24: ...voltage when a load is applied the input impedance of this collector voltage is also at zero This square wave is fed configuration must be very high To accomplish the necessary through capacitor C4 an...

Page 25: ...hose in FIG wherein the means for converting the resultant waveform to 19 are for a NPN grounded emitter with base current versus horizontal and vertical waveforms comprises means supplying collector...

Page 26: ...ent and that said Letters Patent are hereby corrected as shown below r L Column 8 line 18 delete n at the end of the line line 19 change lfb to supplying and staircase to the staircase line 23 change...

Page 27: ...den Utah has become a leading designer and manufacturer of sound augmentation equipment recording studio equipment and electrical apparatus such as solid state characteristic curve tracers Spectra Son...