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e
eratof mual
perating nformation
Publication Date: March 1991
Document Number: 3933A-900-01 Rev. A
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a
period of 1 year from date of shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
rechargeable batteries, diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be de-
fective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in
Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transporta-
tion prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation
prepaid. Repaired or replaced products are warranted for the balance of the original warranty period, or at
least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley's express writ-
ten consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-re-
chargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow
instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIE S, EXPRESSEDOR IMPLIED, INCLUDING
ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR 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 OR CONSEQ UENTIAL DAMAGES ARISING OUT
OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS
BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAM-
AGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION,
LOSSESSUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.
INSTRUMENTS
Instruments
Division, Keithley Instruments, Inc. l 28775 Aurora Road l Cleveland, Ohio 44139 l (216) 248-0400 l Fax: 248-6168
WEST GERMANY: KeithIey Instruments GmbH l Heiglhofsk. 5 l Munchen 70 l 089-71002-0 l Telex 52-12160 l Fax: 089-7100259
GREAT BRITAIN: KeitbIey Instruments, Ltd. l The Minster l 58, Porknan Road l Reading, Berkshire RG 3 IFA -01144 734 575 666 l Fax: 01144 734 596 469
FRANCE KeitbIey Inskuments SARL -3 AlIee des Garays l BP. 60 l 91124 PaIaiseau/ZL l 1-6-OI15 155 l Telex M)O 933 l Fax l-6-0117726
NETHERLANDS: Keitbley Instruments BV l AveIingen West 49 l 4202 MS Gorinchem . P.0. Box559 l 4200 AN GorInchem .01830-35333 l Telex: 24 684. Fax OlS30-30821
SWITZERLAND: Keithley Inskunents SA l Kriebacbsk. 4 l 8600 Dubendorf .01-821-9444 l Telex 828 472. Fax 0222-315366
AUSTRIA: KeitbIey Inskuments GesmbH l Rosenbugelskasse 12 l A-1120 Vienna l (0222) 84 65 48 l Telex: 131677 l Fax (0222) S403597
ITALY: KeitbIey Instruments SRL l Vi&S. G~gnano 4/A l u)146 Milano l 02-4120360 or M-4156540 l Fax: 02-4121249
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
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.
Safety Precautions
The following safety precautions should be observed before using the Model 3933A Phase Shifter and any associated
instruments.
This instrument is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read over this manual carefully before using the instrument.
Exercise extreme caution when a shock hazard is present at the test circuit. The American National Standards Institute
(ANSI) states that a shock hazard exists when voltage levels greater than 30V rms or 42.4V peak are present. A good
safety practice is to expect 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 each use.
For maximum safety, do not touch the test cables or any instruments while power is applied to the circuit under test.
Turn off the power and discharge any capacitors before connecting or disconnecting cables from the instrument.
Do not touch any object which could provide a current path to the common side of the circuit under test or power line
(earth) ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of with-
standing the voltage being measured.
Do not apply more than 42V peak between the outer shell of any BNC connector and chassis ground.
Instrumentation and accessories should not be connected to humans.
Table of Contents
SECTION 1 - General Information
1.1 SUMMARY .................................................................. l-1
1.2 FEATURES.......................................~ ........................... l-l
1.3 WARRANTYINFORMATION .................................................... 1-2
1.4 ~ALADDENDA .......................................................... 1-2
1.5 SAFETYTERMSANDSMLlBOLS .................................................. 1-2
1.6 TJNPACKINGANDREPACKING ................................................. 1-2
1.6.1 Unpacking ................................................................. 1-2
1.6.2 ShipmentContents.. ......................................................... 1-2
1.6.3 InstructionManual ........................................................... 1-2
1.6.4 Repacking For Shipment ....................................................... l-2
1.7 OPTIONALACCESSORIES ...................................................... l-2
1.8 SPECIFICATIONS ............................................................. 1-3
SECTION 2 - Getting Started
2.1 INTRODUCTION....`. ......................................................... 2-l
2.2 INSTALLATION .............................................................. 2-l
2.2.1 InstallationLocation.. ........................................................ 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 TypicalTestConnections ...................................................... 2-3
2.5.3 OperatingExamples .......................................................... 2-3
SECTION 3 - Operation
3.1 LNTRODUCTION .............................................................. 3-1
3.2 FRONT PANEL AND REAR PANEL DESCRIPTION ................................... 3-l
3.2.1 Input and Output Connections .................................................. 3-l
3.2.2 InputConnections ........................................................... 3-1
3.2.3 Output Connections .......................................................... 3-3
3.2.4 GPIB Bus (Input/output Connector) .............................................. 3-4
3.2.5 FrontPanelDescription ........................................................ 3-4
3.2.6 RearPanelDescription ........................................................ 3-11
3.3 STARTUP .................................................................... 3-14
3.4 OPERATINGPROCEDURES ..................................................... 3-15
3.4.1 Setting Parameters Using Numeric Keys ......................................... ;. 3-15
3.4.2 Setting Parameters with the MODIFY Controls ...................................... 3-16
3.4.3 ErrorCodes ............................................. . .................. 3-17
3.4.4 Amplitude Units Conversion ................................................... 3-22
3.4.5 Amplitude Programming ...................................................... 3-25
3.4.6 DC Offset Progr amming ....................................................... 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, and Phase Parameter Programming ..................................... 330
3.5 SWEEPOPERATIONS.. ........................................................ 3-30
3.5.1 Sweep Phase and Sweep Output Relationships ...................................... 3-32
3.5.2 OutputRangeMode.. ....................................................... 3-33
List of Illustrations
SECTION 2 - Getting Started
Figure 2-l LineFilter ............................................................... 2-3
Figure 2-2 FrontPanelSummary ...................................................... 2-4
Figure 2-3 TypicalConnections ....................................................... 2-5
SECTION 3 - Operation
Figure 3-1 LogicInputCircuit ........................................................ 3-1
Figure 3-2 AnalogInputCircuits ...................................................... 3-2
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 Model3933ARearPanel .................................................... 3-12
Figure 3-8 Waveforms and Their Phase Definitions ........................................ 3-24
Figure 3-9 Relational Range for Allowed AC Amplitude Voltage and DC Offset Voltage ............ 3-26
Figure 3-10 Phase Relationship Between Waveform and Output ............................... 3-29
List of Tables
SECTION 2 - Getting Started
Table 2-l Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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, 18 to 28