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Keithley 3933A, Руководство оператора

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Содержание 3933A

Страница 1: ...e eratof mual perating nformation Publication Date March 1991 Document Number 3933A 900 01 Rev A...

Страница 2: ...ARTICULAR USE THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENT S INC NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL...

Страница 3: ...Operator s Manual Model 3933A Phase Shifter 01991 Keithley Instruments Inc All Rights Reserved Instruments Division Cleveland Ohio U S A Document Number 3933A 900 01...

Страница 4: ...All Keithley product names are trademarks or registered trademarks of Keithley Instruments Inc Other brand and product names are trademarks or registered trademarks of their respective holders...

Страница 5: ...pect that hazardous voltage is present in any unknown circuit before measuring Inspect the connecting cables and test leads for possible wear cracks or breaks before eachuse For maximum safety do not...

Страница 6: ...cation 2 l 2 2 2 Fan 2 l 2 3 LINE POWER SUPPLY AND GROUNDING 2 2 2 3 1 LinePowerSupply 2 2 2 3 2 Grounding 2 3 2 4 HANDLINGPRECAUTIONS 2 3 2 5 BASICOPERATION 2 3 2 5 1 Front Panel Summary 2 3 2 5 2 Ty...

Страница 7: ...mming 3 25 3 4 6 DC Offset Programming 3 25 3 4 7 AC Amplitude and DC Offset Relational Restrictions 3 25 3 4 8 Waveform Selection Square Wave Duty Cycle and Synchronous Output 3 28 3 4 9 Mark Span an...

Страница 8: ...Figure 3 3 Typical Digital I O Interconnections 3 2 Figure 3 4 Sweep Marker and Sweep Synchronous Outputs 3 3 Figure 3 5 Waveform Synchronous Outputs 3 3 Figure 3 6 Model3933AFrontPanel 3 5 Figure 3 7...

Страница 9: ...ent 2 3 SECTION 3 Operation Table 3 l Main Synthesizer Amplitude Range When DC Offset is 0 Volts 3 18 Table 3 2 DC only Voltage Setting Range Resolution and Accuracy open load 18to 28 C 3 18 Table 3 3...

Страница 10: ...d Parameter settings are easily made using either the front panel keys and or the modify knob The Model 3933A is equipped with a standard GPIB IEEE 488 interface and can be programmed over the bus to...

Страница 11: ...ead the associated information carefully before performing the indicated procedure The CAUTION heading used in this manual explains hazards that could damage the instrument card Such damage may invali...

Страница 12: ...ce the Model 3940to the IEEE 488bus Model 7051 2 BNC to BNC Cable The Model 7051 2is a 50 Ohm BNC to BNC cable RG 58C 2 feet 0 6m in length The Model 7951 2is terminated with male BNC connectors at bo...

Страница 13: ...unit The Model 3933A weighs about 10 pounds Be careful when carrying the unit or mounting it in a rack WARNING The guards on the rear panel of the unit are designed to protect rear panel connectors an...

Страница 14: ...allows you to change the operating voltage of the power supply The standard setting of the switch is the sameasthe volt age in the country to which the unit is shipped To change the power supply volt...

Страница 15: ...mp cloth Never use solvents such asthinner or benzene or chemi cal dust cloths as these may damage the case or front panel surfaces 2 5 BASIC OPERATION The following paragraphs summarize front panel o...

Страница 16: ...amplitude OFFSET Sets DC offset main only FCTN Sets waveform type I 2 DUTY FXDBO I 1 DSPL 1 1 t i DUTY Allows setting squarewave duty cycle FXDBO Fixed 50 duty cycle L Returns display 1 to normal Set...

Страница 17: ...n to normal display Example 3 Programming the DC Offset The OFFSETkey allows you to setthe DC or average level of the main synthesizer output waveform as in the fol lowing example 1 PressOFFSETand not...

Страница 18: ...and load characteristics as described below or the instrument may be seriously damaged 3 2 2 Input Connections Two types of input signals may be applied through the front and rear panel BNC input con...

Страница 19: ...siveModel 3933A s in a chain of phase shifters A jumper cable CA 94 is re quired to interconnect units The main synthesizer signal from aModel 3930A master unit is applied to the DIGITAL IN connector...

Страница 20: ...m chas The interconnection between the Model 3930A Wave sis ground form Synthesizer master and the Model 3933A Phase Circuits SeeFigure 3 5 SYNC OUT Figure 3 5 WaveformSynchronousOutputs DIGITAL OUTPU...

Страница 21: ...flat keyboard includes aSHIFT key which gives cer tain other keys a secondary function Any key which is shaded with the same background color as the SHIFT key requires that you press SHIFT first befor...

Страница 22: ...a second time to turn the power off An active display also indicates the instrument power is turned on 0 2 Display Power Indicator The two line 40 character display shows pa rameter values and other i...

Страница 23: ...he substituted center phase is different than the marker phase the start and stop phase will change accordingly SPAN phasespan MODIFY NZ J3 This key allows you to set the phase span of the phase sweep...

Страница 24: ...OUT signals on the rear panel aresethigh The X DRIVE OUT signal is setto OV when the start phase is higher than the stop phase it is set to 1OVwhen the start phase is lower than the stop phase HOLD RE...

Страница 25: ...ue you will notice that the cursor is not visible This indicates the MODIFY knob is not operational at this time For example when changing PHASE you want to set a new phase of 124degrees via the DATA...

Страница 26: ...g the MODIFY knob to the right or left Each knob increment increases or decreasesthe selected digit by a value of 1 or 5 When the step size is x 2 you can divide the se lected parameter by 2 by turnin...

Страница 27: ...panel keys Those keys which have shifted functions are indicated by having a brown background color that matches the color of the SHIFT key Keys with shifted functions in clude STOP STATE CONT START P...

Страница 28: ...that parameters cannot be programmed while the main parameter is displayed you must press the appropriate parameter keys before set ting parameters 0 11 AM IN NC Connector This BNC plug is for the Am...

Страница 29: ...next Model 3933A unit in the daisy chain These successive signals are identical to the original master main synthesizer signal 0 17 This 24 pin D type connector accepts remote GPIB bus sipals allowin...

Страница 30: ...element with pressurized air or wash it with amild detergent Make sure that the filter is completely dry before re installing it in the unit The filter should be cleaned at least once every three mont...

Страница 31: ...ry preset parameters will be placed into effect and displayed At this point parameters in effect prior to the preceding power off will be lost This situation occurs when the memory backup battery hasi...

Страница 32: ...rameter name will not flash when the unit is in the GPIB remote mode or when the front panel lock is enabled Some parameters such aswaveform can be selected by pressing a single numeric character Chan...

Страница 33: ...en the keyboard lock is on 2 In the situation in step 1 the existing value specified is displayed and the modification step size is pre sented in the upper right corner of the liquid crystal display M...

Страница 34: ...cognizable programming command ABC Non recognizable inquiry command 123 4 Parameter values without headers l You attempted to set a sweep center or span phase with a value exceeding the start or stop...

Страница 35: ...5 19 6 39 5 39 6 79 2 VP P only 15mV 1 5mV 15o lv 15 L v 15mV 2 n Hardware Resolution ITIllS I dBV v v II l3llS 15 ov 1 5ov I 1 49V 150mV 149mV 15 OmV 14 9mV 0 15mV V on1 dBV 23 5 3 5 3 4 16 5 16 6 36...

Страница 36: ...tions Table 3 3 AC DC Minimum Amplitude Resolution and Accuracy open load Minimum AC Amplitude Hardware Hardware Output Cumulative Range Voltage 2 AC DC output Amplitude Voltage DC Voltage Attenuator...

Страница 37: ...V dbV 21 6 41 6 61 6 80 9 VP ponly rHardware AC Amplitude Resolution 15mVp p 1 5mVp p 15o l vp p 15FVP P 15mVp p Hardware DC Voltage Resolution 7 3mV 73ojJv 73 v 7 3 lv 7 3mV DC Voltage Accuracy 0 2 o...

Страница 38: ...0 150mV plitude setting p p 0 6 of DC voltage setting OSmV More than 2 86mV 1 43mV 56 9 15o lvp p 73pv 0 2 of AC am l 100 15mV plitude setting p p l of DC voltage setting 8OcLv Less than 15mV 0 3OmV 0...

Страница 39: ...ing waveform selection You attempted to set the sweep time to 3msec Er CNVTlO o The result of the units conversion sequence is outside the allowed range of the given value Example You attempted to con...

Страница 40: ...will causea corresponding decreasein value A step sizeof x 2 or x 10 will react differently than the above modifications In this case aclick clockwise will multiply by two or ten A counterclockwise cl...

Страница 41: ...e I I w 0 180 3600 0 180 360 Square Wave with Duty Ratio Fixed at 50 Square Wave with Variable Duty Ratio w I I I I A I Q ti 3 deg iif I 1 I I I I Phase I I t Phase 0 180 360 0 360 Shaded area is the...

Страница 42: ...d enables offset programming When using the numeric keys to setthe offset pressthe V or mV key after entering the value to complete the entry process As with other parameters you can also use MODIFY k...

Страница 43: ...I I I I I I I I I I I ii I t I t t I t I _ _ c 1 1 I I I I vl ATT 111 L h P I I I I I I I I I I I I I I I I I 11 L I ATT l l0 zc All 11100 4OdB Hoc TOdB _ _ _ f _ I L Al l 1IlM 40dB ATT 1110 2OdB A77...

Страница 44: ...ss of setting up those combinations To avoid such errors resetthe DC offset value to OVbefore changing the ampli tude or change the setting specified in Figure 3 9 so that the values are within the ra...

Страница 45: ...mplete cycle of the waveform This ratio is expressed asa percentage For example a 1OkHzsquare wave has a time period of 100psec If the high portion of the waveform has a period of 30pec the duty cycle...

Страница 46: ...SECTION 3 Overation i NOTE The x axis is the lime axis Indicating increasing time toward lhe right Figure 3 10 PhaseRelationshipBetweenWaveformand Oufpuf 3 29...

Страница 47: ...start 330 phase setting The repeat type moves from the start phase through to the stop phase instantly resets to the start phaseand if required begins another sequence The step type outputs the start...

Страница 48: ...e start phase is lower than the stop phase it is set to 1OVif the start phase is higher than the stop phase When the Model 3933A is in this mode pressing the PHASE key enablesnormal phaseprogramming a...

Страница 49: ...peration produces the same result as programming an identical phase with the nu meric keys The marker phase is not affected by this op eration Changing Settings During Sweep Operation Becauseof proces...

Страница 50: ...distortion and noise high precision even when the output signal is low Amplitude and DC offset are combined such that the cummulative value does not exceed 15 volts However when these ratios become l...

Страница 51: ...roughly tested and inspected and certified as meeting its published specifications when it was shipped from the factory However the typi cal data represents mean values of measurements for eachModel 3...

Страница 52: ...Voltage is set voltage load 50 ohms 1 kHz base Figure A l Sine WaveAmplitude Frequency Characteristics TotalHarmonic Distortion Ratio t 4 0 2 0 1 Ik Frequency Hz 10k IOOk Note Amplitude setting 3OVp p...

Страница 53: ...k 10k 1OOk 1M Frequency Hz Note Phase re 1930A when it s two phase 1930A s start stop phase 0 degrees 1933A s phase 0 degrees Both 1930A and 1933A have amplitude 30 Vp p waveform sine load 50 ohms Fig...

Страница 54: ...A and 3933A to these settings DC offset OV AM off 5OQ load same waveform 18 280C o Waveform duty cycle is fixed or variable on both devices cycle is optional o Amplitude setting is between 3O OmVp p t...

Страница 55: ...ELECTRICAL SPECIFICATIONS CONT Output Characteristics Waveform Output when 3930A is in CONT mode when 3930A is in CONT mode Total harmonic distortion lOH2 to lOOkH2...

Страница 56: ...Up to 1OkHz Jitter below 150ns Outnut is on Output Impedance 50R flk unbalanced open when output is off Signal Ground Insulated from chassis insulation breakdown voltage below 150Vpeak lOOHz Connector...

Страница 57: ...eristics Digital I O for Multi Phasing Digital In Input Voltage TTL level Connector 36 pin rear panel Connection Connect 3930A s or 3933A s digital out with this device s DIGITAL IN via a special cabl...

Страница 58: ...GPIB address delimiter 1Identical to Memory Modify Format Per cursor movement and MODIFY knob Up Down Step Siie fl 1Increases or decreases cursor uosition value bv 1 I L z5 x4 2 x 10 Increases or decr...

Страница 59: ...parameter display status B 2 GPIB INTERFACE GPIB Interface Functions 1SHl pabilitv SRl Full service request capability RLl Full remote local operation capability Pro No parallel polling function capab...

Страница 60: ...to 0 30mV 10 5mV to O llmV 3o oov to o oov VP p only 20 5 to 0 5 0 4 to 19 5 19 6 to 39 5 39 6 to 79 2 VP p only 15mV l l 1 5mV l l0 15oJ lv l 100 15j Lv l 1000 15mV l l output Range Mode AC P P 2 l H...

Страница 61: ...ltage setting 8mV More than 150mV 28 6mV lO lmV 39 9 8 25mV 41 6 14 3mV 36 9 1 5mVp p 73OpV 1 0 2 of ACamplitude l 10 setting p p 0 6 of DC voltage setting 0 8mVI More than 15mV 2 86mV l OlmV 59 9 0 8...

Страница 62: ...Figure B l Outer Dimensionsof theModel 39334...

Страница 63: ...to zero q Unstable 0 Will not readappliedinput 0 Overload q Calibration only aData required q Certificate of Calibration required attach anyadditionalsheets asnecessary Showablock diagramof your meas...

Страница 64: ...nts SARL 3 Allee des Garays l B P M l 91124 PaIaiseau ZL l I 60115 155 l Telex 600 933 l Fax l 6 0117726 NETHERLANDS Keitbky Instruments BV l Avelingen West 49 l 4202 MS Gorinchem l P O Box 559 l 4200...

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