Wavetek 188 Instruction Manual Download Page 5

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2011

INSTRUCTION MANUAL

MODEL 188

4 MHz SWEEPI

FUNCTION GENERATOR

1 980

•

WAVETEK

THIS DOCUMENT

CONTAINS INFORMATION PROPRIETARY

WAVETEK AND IS SOLELY FOR

INSTRUMENT

OPERATION AND

MAINTENANCE. THE

INFORMATION IN

THIS

DOCUMENT MAY

NOT BE DUPLICATED IN ANY

MANNER

WITHOUT THE PRIOR AP

PROVAL

WRITING

OF WAVETEK.

WAVETE�

SAN DIEGO

9045 Balboa Ave

. .

San Diego. CA 92123

POBox 651

San

Diego.

CallI

92112

Tel 714/279·2200 TWX 910·335·2007

Marual Revision: 7100

Instrument

Release: Original

Summary of Contents for 188

Page 1: ...ebsite of Cornell Law School at http www4 law cornell edu uscode 17 107 html and is here reproduced below Sec 107 Limitations on exclusive rights Fair Use Notwithstanding the provisions of sections 106 and 106A the fair use of a copyrighted work includ ing such use by reproduction in copies or phono records or by any other means specified by that section for purposes such as criticism comment news...

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Page 3: ...MODEL 188 4 MHz SWEEPI FUNCTION GENERATOR ...

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Page 5: ... WAVETEK AND IS SOLELY FOR INSTRUMENT OPERATION AND MAINTENANCE THE INFORMATION IN THIS DOCUMENT MAY NOT BE DUPLICATED IN ANY MANNER WITHOUT THE PRIOR AP PROVAL IN WRITING OF WAVETEK WAVETE SAN DIEGO 9045 Balboa Ave San Diego CA 92123 POBox 651 San Diego CallI 92112 Tel 714 279 2200 TWX 910 335 2007 Marual Revision 7100 Instrument Release Original ...

Page 6: ...s a result of misuse improper repair or abnormal conditions or operations repairs will be billed at cost Wavetek assumes no responsibility for its product being used in a hazardous or dangerous manner either alone or in conjunction with other equipment High voltage used in some instruments may be dangerous if misused Special disclaimers apply to these instruments Wavetek assumes no liability for s...

Page 7: ...ORE PLUGGING IN the instrument comply with installation instructions MAINTENANCE may require power on with the instrument covers removed This should be done only by qualified personnel aware of the electrical hazards WARNING notes call attention to possible injury or death hazards in subsequent operations CAUTION notes call attention to possible equipment damage in subsequent operations ...

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Page 9: ... CONTROLS AND CONNECTIONS 3 1 3 2 OPERATION 3 2 3 2 1 Signal Termination 3 2 3 2 2 Manual Function Generator Operation 3 3 3 2 3 Voltage Controlled Function Generator Operation 3 3 3 2 4 Sweep Generator Operation 3 4 3 2 5 Waveforms 3 5 SECTION 4 CIRCUIT DESCRIPTION SECTION 5 ALIGNMENT 5 1 FACTORY REPAIR 5 1 5 2 REQUIRED TEST EQUIPMENT 5 1 5 3 REMOVI G GENERATOR COVERS 5 1 5 4 ALIGNMENT 5 1 SECTIO...

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Page 11: ...at selected frequency Gated As triggered mode except output continues for duration of gate signal Last waveform started is completed SECTION GENERAL DESCRIPTION Sweep An internal ramp generator will sweep the main generator from a lower start frequency to a higher stop frequency linearly 3 decades or logarithmically 4 decades Sweep Stop Frequency switches to high sweep limit Used to set high frequ...

Page 12: ...t TIL compatible levels Pulse WIdth 50 ns minimum Repetition Rate 4 MHz maximum 1 2 2 Frequency Prwcla on D Accuracy 5 of full scale Time Symmetry Square wave variation from 0 2 to 4 0on dial less than 1 to 100kHz 5 to 4 MHz 1 2 1 2 3 Amplitude Prwc alon Sine variation with frequency less than 0 2 dB on all ranges through X lOOK 1 0 dB to 4 MHz 1 2 4 Waveform Characterlltfca Sine Dlatortlon Less t...

Page 13: ...ase this instrument was shipped from the factory for operation on a 90 t 128 Vac line supply and with a 1 4 amp slow blow fuse Instruments configured for 180 to 256 Vac have a 1 8 amp slow blow fuse SECTION 2 INSTALLATION Select the appropriate fuse and 115 or 230 switch position at the rear panel when changing power sources 2 2_2 Signal Connections Use 3 foot RG58U 500 shielded cables equipped wi...

Page 14: ...anteed below 30 dB and above 20 kHz TtIb 2 1 Inlt I ChKkout Step Control PoaltlonlOpenltlon Ob rvatlon 1 POWER ON 10V square wave on CHl and lV on CH2 Return to CH1 only 2 Dial Rotate in both directions Return Rotation ccw Increases frequency of ru to 2 0 rotation cw decreases frequency 3 FREQUENCY Press each switch sequentially Frequency Increases in decade steps left to MULTIPLIER return to x 1 ...

Page 15: ...tors as shown in figure 2 3 CONT released Sync scope on channel 2 input 14 Dial Full cw 15 SWEEP Linear sweep CONT depressed Output varies from low frequency to Controls SWP STOP depressed lOG LIN high frequency extended STOP full cw TIME centered 16 LIN lOG Press Logarithmic distributed sweep when compared Button to step 15 linear sweep SYNC OUT OSCILLOSCOPE OSCILLOSCOPE MODEL 188 D SYNC e e 4 4 ...

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Page 17: ...4 5 SECTION 3 OPERATION 4 FREQUENCY MULTIPLIER Controls Selects one of seven frequency multipliers for dial 1 set ting S CaNT Button Selects sweep submode to main generator s continuous mode Ex ended is can inuous nonsweep mode while depressed is sweep mode Sweep is from a low frequency set by loa high frequency set by 3 Main generator mode control 8 must be in continuous mode ex tended 6 SWP STOP...

Page 18: ... LO Connector Same as 15 ex cept 20 dB 1 1 0 lowe r in amplitude 1 7 TIL OUT Con nector A TI L square for each cycle of the generator To be used fOr syn chronization or as a TIL signal capable of driv ing 20 TIL loads 1 8 TRIG IN Connector Accepts a TI L signal to trigger or gate the generator Triggers on the ris ing lOW to high transition and gates during the positive high portion of the triggeri...

Page 19: ...et to desired frequency within the range 4 SWEEP s CONT 5 Extended 5 FUNCTION 12 Set to desi red waveform 6 DC OFFSET 1 3 Set as desi red Limit wave form amplitude to prevent clipping see figure 3 3 7 AM PLITUDE 14 Select for desired ampli tude 3 2 3 Voltage Controlled Function Generator Operation Operation as a voltage controlled function generator VCG is as for a manually control ed function gen...

Page 20: ...cy exceeds the range limits The upper limit is four times the multiplier setting and the lower limit is 111000th linear or 1110 000 logarithmic of the upper limit The up to 1 000 1 linear or 1 0 000 1 logarithmic VCG sweep of the generator frequencies available in each range results from a 4V excursion at the VCG I N con nector With the frequency dial set to 4 0 excu rsions between 4V and OV at VC...

Page 21: ... continuous operation SWP STOP 8 STOP 3 Time 10 Press to release Ex tended allows setting of stop frequency Select the stop frequen cy The stop frequency will always be higher than the start frequen cy Sets the internal sweep rate 1 f o Vdc PERIOD 1 OFFSET SINE CONTINUOUS MODE TRIANGLE f I TRIGGERED MODE GATED MODE saUARE SYNC UL n n n TRIG I N ZlJI ZZ22ZeZZlZl IEZZ SINE TRIANGLE saUARE U U TRIGI ...

Page 22: ... H I N G I I TRIGGER _ I FLlp FLOP COM PARATOR BASELI N E t 1 COMPENSATION Figure 4 1 Function Block Diagram 4 0 V 0 l FREQU ENCY M U LTI PLI ER CAPACITANCE M U LTIPLIER SQUARE SHAPER S I N E CONVERTER FUNCTION SWITCH 1 5V 1 5V 5V 5V POWER SUPPLY SYN C BU FFER PREAM PLI F I ER MAX DC OFFS ET t OFF SWP OUT GCV OUT 9 SYNC OUT TIL O ...

Page 23: ...e 4 1 produces simultaneous generation of triangle and square waves at the same frequency The output frequency is determined by the magnitude of the tim i ng capacitor selected by the frequency mu ltiplier swi tches and by the magn itude of the cur rents su ppl ied to and removed from it Since the cu r rents are lineari ly p roportional to the sum of the VCG inputs so wi l l be the output frequenc...

Page 24: ...for the full duration of the triggeri ng signal The generator produces conti nuous waveforms during the time the extemal signal is high or the manual trigger switch is 4 2 held i n The last triggered cycle started is always com pleted and successive gated bursts always start at the 00 pOint When sweep mode is selected by a combination of the main generator in continuous mode and the ramp generator...

Page 25: ...ent con trois 3 When alignment Is complete secure the bottom cover with fou r screws NOTE Remove the cover only when it is neces sary to make adjustments or measure ments 5 4 ALIGNMENT After referring to the following preliminary data per form a l ignment as necessa ry pe r table 5 1 If per form ing partial a lignment check previous settings and adjustments for appl icabi lity See figures 5 1 and ...

Page 26: ... RI I I ti I _ _ _ I JI u CD i O I U9 l Dfi R45 SV rRY I2 j f11 nUl J J 4 D MAnR I I I I I i ill I 5 1 1 I I IW _J RIIO 1 til fi G J J I I 1 I I I l I Ii t I 1 012 _ _ I I I f i I I I I L_J 1 It 1 I 0 III R _ _ L J J l __ J J r l l 111 J I I J OUTPUT RI a a RI32 CI2 sv_ J 32 A32 J Wll J T R41 J I I R1I1 AMPLITUDE OIS I I OO I cs 1 J CIS C3 l es T _ i 1 5V J 0 0 iU3 _ CIiO I J 1153 OU5 UJ J J 5 V O...

Page 27: ...K Dial 4 0 Dial 4 0 FREQ MULT x 1 K FREO MULT x 10K FREQ MULT x 1 M FREQ MULT x 100K FREQ MULT x 100 FREQ MULT x 10 FREQ x 1 Dial 0004 FREQ MULT x 1 0K SWEEP CONT STOP LOG Adjust R90 R37 R49 R37 R45 R19 C34 R86 R27 Result 15 75V 15 75V 5 25V 5 25V o 2V 20 ms perlOd Equalize and half cycles 250 501 0 ma periOd Equalize and half cycles 4 2 kHz 40 8 kHz 4 02 MHz 400 8 kHz 2 5 05 ms 25 5 ms 250 5 ms 2...

Page 28: ... v R1 18 10 Vp p 3V 0V Voltmeter FUNCTION v R1 1 2 o 50 mv Scope MODE trigger R81 o 75 mv Voltmeter SWP OUT SWEEP CONT R9 o 2 mv Unter SWP LIN Sweep mlnated bOard board Rl Y REV E44 E43 Rl3 I t I J E42 l mO cz I I I I E46 C4 I 1 I I 460 CR SWEEP 61 003 J OFFSET 1i2 I t3 I 0 I l R9 I 8 Ul 1 SW2 Q1 i E48 1 5 0E39 Om 0 0 R1 1 I 113 E47 I Ci _ I I SWl SW3 0E35 L U R12 1 t1 R2 OEJI Figure 5 2 Alignment...

Page 29: ...ifferential pai r common emitter stages either their base voltages are the same in normal operating condition or the one with less forwa rd voltage across its base emitter junction should be off no collecto r current otherwise one of the transistors is defective 6 3 2 Diode A diode except a zener is defective if there is greater than one volt typically 0 7 volt forward voltage ac ross it 6 3 3 Ope...

Page 30: ...ime Once the malfunction is defined begin the isolation procedure by selecting an indication in table 6 1 which best describes the malfunction and proceed to the referenced troubleshooting table Follow through the checks in the troubleshooting table using schematics and assembl ies as a guide When positive results are not obtained perform the in dicated corrective procedure Table 8 1 Faul I olallo...

Page 31: ...de CR1 26 lor approximately 3 5 Vdc Go t o table 6 1 0 1 0 If emi tte r 01 1 has a 4 kHz 1 25V triangle go to table 6 3 1 1 Check for the same voltage at the gate of 09 as at the emitter of al l within satu ration limits of the amplifier 1 2 If the voltage at the emitter of 01 1 is 2 1 25V check cathode CR l 0 for approximately 2 5V If the voltage at the emitter of 01 1 is 1 25V check cathode CA 1...

Page 32: ... 4 kHz 1 2SV triangle 3 Verify that the 1 25V triangle peaks at the emitter 01 01 agree within 3 4 Select triangle function check for 1 25V triangle at U 1 3 pin 1 0 5 Select sine function check ror 1 25V sine at U 1 3 pin 1 0 6 Check sine distortion 500 OUT HI per calibration procedure rerer to table 5 1 7 Check sine amplitude vs frequency per specifications refer to section 1 Scans by ArtekMedia...

Page 33: ... 500 OUT HI for the same 20V p p open circuit Al 06 Al 1 0 Al l 1 ampl itude as the triangle and sine 6 Check riselfa l l times of 4 MHz squa re 500 te rmi nated for 50 ns C51 C55 C56 C57 Table 6 6 TTL Sync Output Indication TTL sync output problem Check Corrective Procedure 1 Set controls to initial positions refer to paragraph 6 4 Check for norma operation 2 Check U8 pi n 1 for a TIL level 4 kHz...

Page 34: ...ted from 004 to 4 0 U6 pin 8 varies from U6 U l and 06 circuits approximately 1 5V to 1 0V 9 Check that as the dial is rotated from 004 to 4 0 the voltage at U4 and Ul c rcuits Ul pin 7 does not saturate near l 5V or 1 5V typical range is between 1 0V and 1 0V and stops varying with the dial 1 0 Check that a s the dial I s rotated from 004 to 4 0 U 4 pin 1 3 varies from approximately 1 5V to 1 0V ...

Page 35: ...t cathode CRI O is approximately 2V a Q7 circuit 7 Check US CAB Table 8 9 Capacitance Multiplier Indication Problem on bottom frequency ranges only Check 1 Set controls to initial positions refer to paragraph 6 4 b U7 circuit c 5V supply Corrective Procedure Check for normal operation on x 1 K range 2 Check for 0 Vdc at U pins 2 and 6 SW2 SW4 3 Check for approximately 0 Vdc at U l 1 pin 1 2 U 1 ci...

Page 36: ...2 and 5 4 Check for a TTL low at U 1 0 pin 1 0 5 Check for SV at Ul0 pin 9 6 Check for approximately 3 5V at anode CR6 Check for normal contin uous mode operation 7 Check that U6 pin 4 and U6 pin 1 5 vary from approximately 1 0V to 1 SV as dial is rotated from 4 0 to 004 a Go to gated mode CONT depressed TRIG GATE released Check U9 pin 2 for a TTL high 6 8 Scans by ArtekMedia 2011 Corrective Proce...

Page 37: ...ernal generator makes this pulse more visible 1 7 Remove the external signal and verify that U 1 0 pin S goes from high to low when the MAN TRIG switch is held depressed 1 8 Release the TRIG GATE switch gated and check that U 1 0 pin 1 0 goes from high to low when the MAN TRIG switch is pressed 1 9 Monitor 500 OUT triangle function for 0 Vdc baseline 20 Press MAN TRIG switch and check Soo OUT for ...

Page 38: ...If ramp amplitude is 4V peak 4 At SWP OUT check for period change of approximately 30 ms to 60s as the TI ME control is rotated from full ccw to full cwo 5 At SWP OUT check tor ramp period drift 6 At E39 with STOP control full cw ramp amplitude is 4V peak with STOP control full CCW ramp amplitude is av 6 1 0 Scans by ArtekMedia 201 1 CorrectJve Procedure a Ul b SW2 U1 03 01 02 02 R22 C4 R1 2 SW1 S...

Page 39: ...SECTION 7 PARTS AND SCHEMATICS 7 3 ADDEN DA U nder Wavetek s product imp rovement program the latest electronic designs and circuits are i ncorporated i nto each Wavetek instrument as quickly as develop me nt and testing permit Because of the time needed to compose and print instruction manuals it is not always possible to include the most recent changes in the initial printing Wheneve r this occu...

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Page 50: ... lVAVETE SAN DIEGO 9045 Balboa Ave San Diego CA 921 23 P O Box 65 1 San Diego calif 921 1 2 Tel 7 1 41279 2200 TWX 91 0 335 2007 Scans by ArtekMedia 2011 ...

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