Keithley 3930A User manual

Model3930A
Multifunction Synthesizer
Service Manual
Contains Operating and Servicing Information

WARRANTY
Keithley Instruments,Inc. warrantsthis productto befreefrom defectsin materialandworkmanshipfor aperiod of 1yearfrom dateof
shipment.
Keithley Instruments,Inc. warrantsthe following itemsfor 90 daysfrom the dateof shipment:probes,cables,rechargeablebatteries,
diskettes,anddocumentation.
During the warrantyperiod,we will, atour option, eitherrepairor replaceanyproductthatprovesto bedefective.
Toexercisethis warranty,write or call your local Keithley representative,or contactKeithley headquartersin Cleveland,Ohio. You will
be given prompt assistanceandreturn instructions. Sendthe product, transportationprepaid,to the indicated servicefacility. Repairs
will bemadeandtheproductreturned,transportationprepaid.Repairedor replacedproductsarewarrantedfor thebalanceof theorigi-
nal warrantyperiod,or atleast90 days.
LIMITATION OF WARRANTY
This warranty doesnot apply to defectsresulting from product modification without Keithley’s expresswritten consent,or misuseof
any product or part.This warranty alsodoesnot apply to fuses,software,non-rechargeablebatteries,damagefrom batteryleakage,or
problemsarising from normal wearor failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSEDOR IMPLIED, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FORA PARTICULAR USE.THE REMEDIES PROVIDED HEREIN ARE
BUYER’S SOLEAND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI-
RECT,SPECIAL, INCIDENTAL ORCONSEQUENTIAL DAMAGES ARISING OUT OFTHE USEOFITS INSTRUMENTS AND
SOFTWAREEVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCHDAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTSOF REMOVAL
AND INSTALLATION, LOSSESSUSTAINEDAS THE RESULTOFINJURY TO ANY PERSON,ORDAMAGE TO PROPERTY
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Model 3930A Multifunction Synthesizer
Service Manual
Q 1991, Keithley Instruments, Inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
August 1991, First Printing
Document Number: 3930A-902-01 Rev. A

All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered trader&k of their respective holders.

Safety Precautions
The following safety precautions should beobserved before using the Model 3930AMuhifunction Synthesizer and any
associated instruments.
This instzument is intended for useby qualified personnel who recognize shock hazards and arefamiliar with the safety
precautions required to avoid possible injury. Read over this manual carefully before using the instrument.
Exercise extreme caution when ashock 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 424V peak are present. A good
safety practice is to expect that hazardous voltage is present in any unknown cikuit before measuring.
Inspect the connecting cablesand 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 cablesfrom 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 adry, insulated surface capable of with-
standing the voltage being measured.
Instrumentation and accessoriesshould not be connected to humans.

HOW TO USE THIS MANUAL
Details procedures to verify that the instrument meets
SECTION 1
stated specifications.
Performance Verification
Describes basic operating principles for the various cirtits in
SECTION 2
the Model 3930A.
Principles of Operation
.
Covers fuse replacement, calibration and repair of the instru-
ment, and lists replacement parts.
SECTION 3
Service Information
WARNJNG
The information in this manual is intended for qualified serv-
ice personnel who can recognize possible shock hazards. Do
not attempt these procedures unless you arequalified to do so.

Table of Contents
SECTION 1 - Performance Verification
1.1 INTRODUCTION .............................................................. 1-l
1.2 ENVIRONMENTALCONDITIONS.. ............................................... l-l
1.3 INTTIALCONDlTIONS ......................................................... l-l
1.4 LINEPOWER ................................................................. l-l
1.5 RECOMMENDED TESTEQUIPMENT .............................................. l-l
1.6 VERIEICATIONPROCEDTJEES ................................................... 1-2
1.6.1 Frequency and Duty Cycle Accuracy .............................................. l-2
1.6.2 Amplitude Accuracy .......................................................... l-4
1.6.3 Frequency Response (Sine) ..................................................... l-5
1.6.4 Frequency Response (Triangle, Sawtooth, Square) ..................................... l-7
1.6.5 TotalHmonicDistortion ..................................................... l-8
1.6.6. DC Voltage Accuracy ......................................................... l-9
1.6.7 DCLevel(Square)andDCOffsetError(Sine) ........ . .............................. l-9
1 1.6.8 RiseandFaLlTimes ........................................................... l-9
SECTION 2 - Principles of Operation
2.1 INTRODUCTION .............................................................. 2-l
2.2 BLOCK DIAGRAM ............................................................ 2-l
2.2.1 ControlSection .............................................................. 2-l
2.2.2 Display and Keyboard Section ................................................... 2-l
2.2.3 TriggerSection.. ............................................................ 2-l
2.2.4 Synthesizer Section ........................................................... 2-l
2.2.5 AnalogSection .............................................................. 2-l
2.2.6 Power Supply Section ......................................................... 2-3
2.3 ANALOGCIRCUITDESCRD?TION
................................................ 2-3
2.3.1 Analog Section Block Diagram .................................................. 2-3
2.3.2 D/A Converter .............................................................. 2-3
2.3.3 SquareWaveGenerator ....................................................... 2:3
2.3.4 AmplitudeModulation ........................................................ 2-3
2.3.5 Amplitude and DC Offset Control ................................................ 2-3
2.4 SYN’IHESIZEROl’ERATINGPRINCII’LES .......................................... 2-5
SECTION 3 - Service Information
3.1 INTRODUCTION .............................................................. 3-l
3.2 LINEFLJSEREPLACEMENT ..................................................... 3-l
3.3 CALIBRATION ............................................................... 3-l
3.3.1 EnvironmentalConditions ..................................................... 3-2
3.3.2 InitialConditions ............................................................ 3-2
3.3.3 LinePower ................................................................. 3-2

3.3.4 Recommended Calibration Equipment ................. ............................ 3-2
3.3.5 Cover Removal .............................................................. 3-3
3.3.6 Calibration Adjustments ....................................................... 3-3
3.3.7 CalibrationProcedures ........................................................ 3-6
3.3.8 Cover Replacement ........................................................... 3-9
3.4 FAN FILTER CLEANING ........................................................ 3-9
3.5 FCTN OTJTJUMPER ........................................................... 3-9
3.6 RECHARGEABLE BATTERY REPLACEMENT ........................................ 3-10
3.7 REPAIR ..................................................................... 3-10
3.7.1 Factory Service .............................................................. 3-10
3.7.2
PowerSupplyTestPoints ...................................................... 3-10
.3.7.3 Board-Level Repair ........................................................... 3-12
3.8 REPLACEABLE PARTS ......................................................... 3-12
3.8.1 Parts List .................................................................. 3-12
3.8.2 Ordering Parts .............................................................. 3-12
APPENDICES
A TypicalData............................................................,..... A-l
B Model3930ASpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-l

List of Illustrations
SECTION 1 - Performance Verification
Figure l-l Connections to Timer/Counter ............................................... l-3
Figure l-2 Connections to Model 197A DMM ............................................ l-4
Figure l-3 Connections to Wideband AC DVM ........................................... l-5
Figure l-4
Co~ections to Audio Analyzer .............................................. l-8
SECTION 2 - Principles of Operation
Figure 2-l Overall Block Diagram ..................................................... 2-2
Figure 2-2 Analog Selection Block Diagram .............................................. 24
Figure 2-3 Frequency Synthesizer Address Generator Diagram ............................... 2-5
Figure 2-4 Address Generator Waveform ............................................... 2-6
Figure 2-5 Waveform Memory and D/A Converter ........................................ 2-6
SECTION 3 - Service Information
Figure 3-l CoverRemoval ........................................................... 3-3
Figure 3-2 Analog Board (NP-21022) Calibration Adjustments ................................ 3-4
Figure 3-3 Control Board (NJ?-10408)Calibration Adjustments ................................ 3-5
Figure 3-4 Co~eciions to Model 197A DMh4 ............................................ 3-6
Figure 3-5 Second Model 3930A Corux!ctions ............................................. 3-7
Figure 3-6 Co~eciions to PM 6654CCounter ............................................ 3-8
Figure 3-7 connections to Dv’M ...................................................... 3-9
Figure 3-8 Power Supply Test Point Locations ............................................. 3-11
Figure 3-9 ExplodedView ........................................................... 3-13
-. -

List of Tables
SECTION 1 - Performance Verification
Table l-l VerificationEquipment ..................................................... l-2
Table l-2 Limits for Frequency and Duty Cycle Accuracy ................................... 13
Table l-3 Limits for Amplitude Accuracy ............................................... l-4
Table l-4 Limits for Frequency Response (Sine) .......................................... l-6
Table l-5 Limits for Frequency Response (Triangle, Sawtooth, Square) ......................... l-7
Table l-6 Limits for Total Harmonic Distortion .......................................... l-8
Table l-7 Limits for DC Voltage Accuracy .............................................. l-9
Table l-8 Limits for DC Level (Square) and DC Offset Error (Sine) ............................ l-9
Table l-9 Limits for Rise/Fall Times ................................................... l-10
SECTION 3 - Service Information
Table 3-l Recommended Line Fuses ................................................... 3-l
Table 3-2 Recommended Test Equipment for Calibration ................................... 3-2
Table 3-3 Power Supply Test Point Summary ............................................ 3-10
Table 3-4 Board Level Repair Summary ................................................ 3-12
Table 3-5 Replaceable Parts ......................................................... 3-12

SECTION1
Performance Verification
1.1 INTRODUCTION
The procedures outlined in this section may be used to
verify that the Model 3930A is operating within the limits
stated in the specifications. Performance verification may
be done when the instrument is first received to ensure
that no damage or n&adjustment has occurred during
shipment. Verification may also beperformed whenever
there is a question of instrument accuracy, or following
calibration, if desired.
NOTE
If the instrument is still under warranty (Less
than one year from the date of shipment), and
its performance falls outside the specified
range, contact your Keithley representative or
the factory to determine the correct course of
action.
1.2 ENVIRONMENTAL CONDITIONS
All measurements should be made at 18-28°C (65-82W
and at lessthan 70%relative humidity.
1.3 INITIAL CONDITIONS
The Model 3930A must be turned on and allowed to
warm up for atleast one hour beforebeginning the verifi-
cation procedures. If the instrument has been subject to
extremes of temperature (outside the range specified in
the previous paragraph), additional time should be al-
lowed for internal temperatures to reach normal operat-
ing temperature. Typically, it takes one additional hour
to stabilize aunit that is 10°C(18’FQoutside the specified
temperature range.
1.4 LINE POWER
Besure to setthe line voltage switch for the correct volt-
age. The instrument should be operated at a voltage
within SO% of the line voltage setting and at afrequency
from 48to 62Hz.
1.5 RECOMMENDED TEST EQUIPMENT
Table l-l lists all the test equipment needed for verifica-
tion. The procedure for performance verification isbased
on using this exact equipment.
NOTE
The verification limits reflect only the accu-
racy specifications of the Model 3930A. They
do not include test equipment tolerance.
Alternate equipment may be used aslong asthe substi-
tute equipment has specifications at least as good as
those listed in Table l-l.
l-l

SECTION P
PeqSmnameVm~cafion
Manufacturel
Keithley
Fluke
Philips
l%nasonic
Keithley
Keithley
Pomona
Model
197A
892OA
PM 6654C
PM 9678
VW722A
7051-2
7755
1468
Table l-l. Verific tion Equipment
Description
DMM (DC volts, AC volts)
(5-l /2 digits)
DVM (AC volts)
(3-l /2 digits)
Timer/Counter
TCXO option
Audio Analyzer
BNC Interconnect Cable
5OQFeed-through Terminator
BNC-banana Adapter
1.6 VERIFICATION PROCEDURES 1.6.1
The following paragraphs contain the detailed proce-
dures for verifying accuracy specifications of the Model
3930A using the equipment listed in Table l-1. The allow-
able reading limits in theseprocedures do not in&de er-
ror that could be contributed by this equipment.
These procedures are intended for use only by qualified
personnel using accurate and reliable test equipment. If
the instrument is out of specifications and not under war-
ranty, refer to the calibration information in the service
manual.
1Specifications
~20V range; *(0.015% of rdg + 3 counts)
ACV; k(O.35%of rdg + 100counts>
20V range; lkHk-2OOkHz (0.5%of rdg),
2OOkHz-1MHz (0.7%),I-1oMHz (3%),lo-2oMHz (5%)
O.OlHz-12OMHz; time baseaging
cl x IO-‘/month; Vp-p measurements
lOHz-11OkHz; 0.001%at full scale;fldB harmonic dis-
tortion accuracy from lOH2 to 15.99kHz
5OQcoaxial cable (RG-58C),male BNC connectors, 2ft
(0.6m)
BNC to BNC adapter, 5OQtermination, DC to
25oMH2, VSWR of cl.1
Female BNC connector to double banana plug
Frequency and Duty Cycle
Accuracy
1. Connect the function synthesizer to atimer/counter
asshown in Figure l-l. Turn on both instruments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT PRST.
3. Program a 1MHz sine function of 2OVp-p.
4. Set the timer/counter to display the frequency at
Channel A and verify that the frequency reading is
within the limits specified in Table l-2.
5. Program a1OOHzsquare wave with afixed 50%duty
cycle.
6. Setthe timer/counter to display the pulse width of
Channel A, and verify that the reading is within
specifications.
7. Modify the frequency and duty cycle settings of the
synthesizer according to Table l-2, and verify the
pulse width readings.
l-2

SECTTON1
PerformanceVerification
Model 3930A
Model PM 6654C Counter/Timer
Set for 5OQ
input impedance
Fipure I-I. Connectionsto Timer/Counter
Table 1-2. Limits for Frequency and Duty Cycle Accuracy
Allowable Reading
Function Amplitude Frequency (ltJ°C to 28OC)
Sine 2ovp-p MHZ 999.995lcHz to 1.000005MHz
Square @XD50) 2OVp-p 1OOHZ 4.97msec to 5.03msec
1kH.Z 497psec to 503psec
5kHz 99.4psec to 100.6psec
1okHz 49.7psec to 50.3pec
Square (VAR50) 2OVp-p 1QOHZ 4.98msec to 5.02msec
1kHZ 498psec to 502pec
5kHz 99.6p.sec to 100.4psec
1okHz 49.8psec to 50.2psec
l-3

SECTTON1
Performance Verification
1.6.2 Amplltude Accuracy
1. Connect the function synthesizer to a DMM as
shown in Figure l-2. Turn on both instruments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT PRST.
3. Program a 1kHz sine function amplitude of
7.49vp-p.
4: Setthe DMM to measure AC volts with autoranging,
and verify that the voltage reading is within the lim-
its specified in Table l-3.
5. Change the function, frequency, and amplitude set-
tings of the synthesizer according to Table l-3, and
verify the voltage readings.,
Model 3930A
,
Function
/ output
Model .
197A DMM
Pomona 1468
I Model7051-2 Coaxial
Cable I
hield
Figure 1-2. ConnectionstoModel 297A DMM
Function
Table 1-3. Limits for Amplitude
Accuracy
Allowable Reading
Amplitude Frequency (18OCto 28’0
Sine 7.49vp-p 1kHZ 2.6349Vrms to 26613Vrms
Square (FXD50) 3.558W.n~ to 3.782Vrms
Triangle 2.0541Vrms to 2.1837Vrms
Sawtooth Up 2.0541Vrn-t~ to 2.1837Vrms
Sawtooth Down 2.0541vrms to 2.1837Vrms
Sine 3ovp-p 1kHZ 10.5536Vrms to 10.6596Vrms
1okHz 10.5536Vrms to 10.6596Vrms
2okHz 10.5536Vrms to 10.6596Vrms
50!&2 10.5536vrms to 10.6596Vrms
Sine lOVp-p lkH2 3.5179vrms to 3.5532Vrms
1okHz 3.5179vrms to 3.5532Vrms
2okHz 3.5179lhlns to 3.5532Vrms
501612 3.5179vrms to 3.5532Vrms
Sine 3VP-P 1kl-b 1.05536vrms to 1.06596Vrms
1okHz 1.05536Vrms to 1.06596Vrms
2okI-k 1.05536Vn.n~ to 1.06596Vrms
5OHz 1.05536Vnns to 1.06596Vrms
Triangle 3ovp-p 1kHZ 8.617OVrms
to
8.746SVrms
Square 1425vrms to 15.15vrms
Sawtooth Up 8.617OVrms to 8.7468Vrms
Sawtooth Down 8.617OVrms to 8.7468Vrms
l-4

SECTTONI
PerformanceVerification
1.6.3 Frequency Response (Sine)
1. Connect the function synthesizer to a wideband AC
DVM as shown in Figure 1-3.Turn on both instru-
ments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT PRST.
3. Program a lkH2 sine function of BOVp-p.
4. Setthe DVM to measure AC volts with autoranging,
and verify that the voltage reading is within the lim-
its specified in Table l-4.
5. Setthe DVM to measure dB and select a 5052 refer-
ence imoedance. PressREL to establish the oresent
6. Change the frequency setting of the synthesizer ac-
cording to Table l-4, and verify the subsequent &dB
readings.
7. Program a 1kHz sine function of 3.75Vp-p, and ver-
ify that the voltage reading is within limits. Press
REL to establish the reading asthe relative dB refer-
ence.Verify the fdB readings for the remaining fre-
quencies.
8. Program a 1kHz sine function of 3.74Vp-p, and ver-
ify the reading. Establish the present reading asthe
relative dB reference. Verify the fdB readings for the
remaining frequencies.
voltage ieading asthe relative dB reference. l
Id 3930A
Model 7755
5Oi-l
Feed Through
Model 8920A Voltmeter
Function
output Model 70512
Coaxial Cable
Figure Z-3. Connectionsto WidebandAC DVM
l-5

SECTTON 1
PerformanceVerijScafion
Table l-4. Limits for Frequency Response (Sine)
Function
Sine
Sine
he
Allowable Reading
Amplitude Frequency (1WCto 28W
3ovp-p 1kHZ 5.2vrms to 5.4vrms (=REF)
1OkHZ -0.ldB to i-O.ldB
1ookHz -0.ldB to +O.ldB
2OOkHz -0.3dB to +0.3dB
35okHz -0.3dB to +0.3dB
5ookHz -0.3dB to +0.3dB
7OOkHz -0.3dB
t0 +0.3dB
8OOkI-h -0.5dB to +0.3dB
9ookt3z -0.5dB to +0.3dB
1MHz -0.5dB to +0.3dB
1.m -l.OdB to +0.3dB
3.75vp-p 1kTdz 0.65Vnns to 0.676Vrms (=RJIF)
1OkHZ -0.ldB to +O.ldB
100kHz -0SdB to +O.ldB
200kHz -0.3dB to +0.3dB
35okHz -0.3dB to +0.3dB
5OOkHz -0.3dB to +0.3dB
7OOkHz -0.3dB to +0.3dB
8OQkHZ
-0.5dB to +0.3dB
9ookHz -0.5dB to +0.3dB
m4J3z -0.5dB to +0.3dB
1.2MHz -1.OdB to +0.3dB
3.74vp-p 1kHZ 0.648vrms to 0.674Vrms (=RJIF)
1OkHZ -0SdB to +O.ldB
1001cHz -O.ldB to +O.ldB
2OOm -0.3dB to +0.3dB
35okI-k -0.3dB to +0.3dB
500kHz -0.3dB to +0.3dB
7OOkJsz -0.3dB to +03dB
8OOkHz -0.5dB to +0.3dB
9ookHz -0.5dB to +0.3dB
*I 1MHZ -0.5dB to +0.3dB
1.2MHz -1 .OdB to +0.3dB
l-6

SECTION 1
Perhrmance Verification
1.6.4 Frequency Response (Triangle,
Sawtooth, Square)
1. Connect the function spthesizer to a timer/counter
asshown in Figure l-1. Turn on both instruments.
2. Restore factory defaults on the Model 3930A by
pressing SHJFTPRST.
3. Program a 1kHz triangle wave of 3OVp-p.
4. Set the timer/counter to display the peak-to-peak
voltage at Channel A, and verify that the voltage
reading is within the limits specified in Table l-5.
Call this reading REF.
5. Change the frequency to 5kHz. The new reading
should be between 0.97 times the REFreading and
1.03times the REFreading.
6. Modify the frequency and function settings of the
synthesizer according to Table 1-5, and verify that
the corresponding readings are within the specified
limits.
Table 1-5. Limits for Frequency Response (Triangle, Sawtooth, Square)
Allowable Reading
Function Amplitude Frequency WC to 28OC)
Triangle 3ovp-p 1kHz 14.25vp-p .to 15.75vpp (=REF,I
5kHz 0.97xm to 1.03x REF
1okHz 0.97xREF to 1.03x REF
Sawtooth Up 3OVP-P 1kHz l4.,25Vp-p to 15.75vp-p (=REP)
5kHz 0.95XRECF to 1.05x REF
1okHz 0.95x RBF to
1.05XREF
Sawtooth Down 3ovp-p 1kHz 14.25vpp to 15.75vp-p (=REF)
5kHz 0.95xREF to 1.05x REF
lOkJ!Iz 0.95XRW to 1.05x REF
Square 3ovp-p 1kHZ 14.25vpp to 15.75vp-p (=REFI
5kHz 0.98xRRF to 1.02x REF
1OkHZ 0.98xRRF to 1.02x REP
1ookHz 0.98xREF to 1.02x REF
l-7

SECTION I
Performance Verification
1.6.5 Total Harmonic Distortion
1. Connect the function synthesizer to an audio ana-
lyzer as shown in Figure l-4. Turn on both instru-
ments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT PRST.
3. Program a 1kHz sine function of 3OVp-p.
4. Set the audio analyzer to measure distortion, and
verify that the reading is within the limits specified
in Table l-6.
5. Change the frequen,cy setting of the synthesizer ac-
cording to Table 1-6,and verify the distortion read-
ings.
Table l-6. Limits ‘for Total Harmonic Distor-
tion
Function Amplitude Frequency
Sine 3ovp-p 1kHZ
1OkI-b
2okHz
35kH!z
5okHz
7okHz
1OOkHZ
Allowable
Reading
(18’C to 28’C)
< 0.1%
< 0.1%
< 0.1%
< 0.1%
< 0.1%
c 0.1%
< 0.1%
Model 3830A
-yL--mx”
Function 1
Model VP-7722A Distortion Analyzer
Model 7051-2 Coaxial Cable I Model7755
5OQFeedThrough
Note: Put FLT Switch
in ground position
Figure 1-4. ConnectionstoAudio Analyzer
_. -
1-8

SECTTON
PerformanceVerificaiion
1.6.6. DC Voltage Accuracy
1. Connect the function synthesizer to a DMM as
shown in Figure 1-2.Turn on both instruments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT.PRST.
3. Program the DC function, OHz,2.OOmVamplitude,
with +15V offset.
4. Setthe DMM to measure DC volts with autoranging,
and verify that the voltage reading is within the lim-
its specified in Table 1-7.
5. Change the offset setting of the synthesizer accord-
ing to Table 1-7, and verify the subsequent voltage
readings.
Table l-7. Limits for DC Voltage Accuracy
Function
DC
Offset
I
Allowable Reading
(18’C to 28’C) I
+15v
-15v
i-5v
-5v
+1.5v
-1.5v
+14.842V to +15.158V
-14.842V to -15.158V
+4.942V to +5.058V
-4.942V to -5.058V
+1.477v to +1.523v
-1.477v to -1.523v
1.6.7 DC Level (Square) and DC Offset
Error (Sine)
1. Connect the function synthesizer to a DMM as
shown in Figure 1-2.Turn on both instruments.
2. Restore factory defaults on the Model 3930A by
pressing SHIFT PRST.
3.
Program a 7.49Vp-p square wave, gated mode, Ext
1 trigger source, and +90” of phase.
4. Setthe DMM to measure DC volts with autoranging,
and verify that the voltage reading is within the lim-
its specified in Table l-8.
5. Change the function, amplitude, mode, trigger
source, and phase settings of the synthesizer accord-
ing to Table 1-8 and verify the voltage readings.
1.6.8 Rise and Fall Times
1. Connect the function synthesizer to atimer/counter
asshown in Figure l-1. Turn on both instruments.
2. Restore factory defaults on the Model 393014by
pressing SHIFT PRST.
3.
Program a lOOkHI square wave (FXD50) of 3OVp-p.
4. Setthe timer/counter to measure rise/fall times of
Channel A and verify that the rise time is within the
limit specified in Table 1-9.Then change the slope to
measure the fall time and verify the reading.
5. Change the amplitude setting of the synthesizer ac-
cording to Table 1-9 and verify the remaining rise/
fall times.
Table l-8. Limits for DC Level (Square) and DC Offset Ekror (Sine)
Trigger Allowable Reading
Function Amplitude Mode Source Phase (18’C to 28’C)
Square 7.49vp-p Gate ExtiL +90° 3.715v to 3.774v
-90° -3.715v to -3.774v
Sine 3ovp-p Gate Extk 0’ i68mV
3vp-p.
fl4mV
l-9

SECTION1
Performance Verification
Table I-9. Limits for Rise/Fall Times
Function Frequency Amplitude
Square (FXD50) 1OOkHZ 3ovp-p
3.75vp-p
3.74vp-p
I I
Allowable Reading
Time (lS=‘Cto 28“C)
Rise
Fall
E
Rise
Fdl
c 150nsec
< 150nsec
< 150nsec
< 150nsec
< 150nsec
< 150nsec
l-10