Good Will Instrument GOS-310 User manual

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SM
View
Instra

75mm OSCILLOSCOPE
MODEL: GOS-310
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TABLE OF CONTENTS
ECDECLARATION OF CONFORMlTY ...................................................................................................................... 3
FOR UNITEDKINGDOM ONLY .................................................................................................................................... 4
1.FEATURES AND SAFETY TERMS .............................................................................................................................. 5
II.SPECIFICATI0NS ........................................................................................................................................................ 7
III.PANEL CONTROLSAND FUNCl'IONS .............................................................................................................. 10
IV . GENERALEQUIPMENT SAFETY ....................................................................................................... - .............. 12
V.SPEC1.LSAFETY NOTES ABOUT YOUR OSCILLOSCOPE
............................................................................. 12
M . PRECAUTIONS TOPROTECT YOUR OSCILLOSCOPE ................................................................................... 13
W . GENERAL OPERATION ........................................................................................................................................ 14
1 . INITIAL SET.UP ........................................................................................................................................................ 14
2 . USING DEFFREBT TRIGGERINGMODES .................................................................................................................... 14
Vm . APPLICATIONS ..................................................................................................................................................... 16
1 . DC VOLTAGE MEAsUREMENT .......................................................................................................................... 16
2 . PEAK-TO-PEAKVOLTAGE -s .......................................................................................................... 17
3 . PEAK-TO-PEAKVOLTAGEMEASUREMENTS (OW OF RANGE) .................................................................................... 18
4 . WAVEFORMPERIOD -s ..................................................................................................................... 18
5 . OW-OF-RANGE PERIOD -S ................................................................................................................. 20
6
. PHASE DIFFERENCE
(POINT-m ~OD) ...................................................................................... 20
7
. COMPARATIVE FREQUENCY -S AND PBASE COMPARISONS .................................................................. 21
M . GENERALADJUSTMENTS AND CHECKS ........................................................................................................ 24
1 . PROBE COMPENSATION ........................................................................................................................................ 24
2
. HORIZONTAL TRACE ALIGNMENT wrr~ GRATICULE .................................................................................................. 24
3 . QUICK CALIBRATIONCHECK .................................................................................................................................... 24
4 . CASE REMOVAL ....................................................................................................................................................... 25
5 . FUSE REPLACEMENT ................................................................................................................................................ 25
6 . CHANGINGVOLTAGE OF OPERATION ........................................................................................................................ 26
7
. POWER SUPPLY VOLTAGECHECKS ........................................................................................................................... 26
8 . A~~IGMATISM AD- ..................................................................................................................................... 27
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............................................................................................................................................................... 9 . CI~NINC; 27
................................................................................................................. X . VERTICAL CIRCUITS ADJUSTMENTS
27
I . DC BALANCE AD.WST~NI' ................................................................................................................................... 27
2
. HIGH FREQUENCYCOMPENSATION ........................................................................................................................... 27
3 . VERTICALGAINCALIBRATION ................................................................................................................................ 28
4 . VERTICALPOSITION CE~KING .............................................................................................................................. 28
5 . VERTICALFREQUENCYCOMPENSATION .................................................................................................................... 28
...........................................................................................................
XI . HORIZONTAL CIRCUIT ADJUSTMENTS
29
I . HORIZONTAL VAIUABW RANGE ADJUSTMENT .......................................................................................................... 29
2 . TIME BASECALIBRATION ......................................................................................................................................... 29
3 . HORIZONTN~POS~IONADJUSTMENT ....................................................................................................................... 29
4 . EXTERNALHORJZONTAL EXT SENSITIVITY AND POSITIONADJUSTMENTS ................................................................. 30
5 . TRIGGERING STABILITY ADJU.STMENT ..................................................................................................................... 30
...................................................................................
XII . CALIBRATE SIGNAL ADJUSTMENT ............................. ,
31
1 . C~LIBRATESIGNALFREQUENCYADJUSTMENT .......................................................................................................... 31
2 . CALIBRATESIGNALVOLTAGE ADJUSTMENT ............................................................................................................. 31
XI11 . SCHEMATICS ...................................................................................................................................................... 32
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EC Declarationof Conformity
We
GOODWILL INSTRUMENT CO.,LTD.
(1) NO. 18, Lane 54, Chung ChengRd., Hsin-Tien City, Taipei Hsien, Taiwan, R.O.C.
(2) Plot 522, LorongPerusahaan Baru 3, Prai Industrial Estate, 13600 Prai, Penang, Malaysia
declareunder sole responsibilitythat the
GOS-310
meets the intent of Directive 891336EEC ; 921311EEC ; 93168lEEC for Electromagnetic Compatibility
Compliance
was demonstratedto the followingspecifications as listed in the industrial Technology
Research institute
ENSOMI-1: Ebectramajpetic compahii +
(1992) Generic emission sandatd
Part I. Restdeartial commerciaf and Light ind#.ry
EN50082-1: Electromaggetic cmn@bility -
(1 992) Genoffic immunity standard
Part I: Redentiah commerciaf and Light ~ndus~y
Conducted Emission
Radiated Emission
Current Harmonics
Voltage Fluctuations
Low Voltage
Directive
EN 55022 class B
(1994)
ElectrostaticDischarge
Radiated
Immunity
Electrical Fast Transients
Surge
Immunity
Voltage Diphtemrption
EN 61000-3-2
EN 61000-3-3
EN 61010-1
(1995)
(1987)
(1993)
IEC 1000-4-2
lEC 1000-4-3
IEC 1000-4-4
IEC 1000-4-5
ESJ 61000-4-1 1
(1995)
(1995)
(1995)
(1995)
(1994)
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FOR UNITED KINGDOM ONLY
NOTE
This leadlappliance must only
be wired by competent persons
WARNING
THIS APPLJANCE MUST BEEARTHED
IMPORTANT
Thewires in this lead arecoloured in
accordancewith the following code:
1 Greed I I
Yellow: Earth
Blue: Neutral
Brown: Live(Phase)
As the coloursof the wires in main leads may not correspondwith the
colours markings identified inyour plug/appliance,
proceed
as follows:
The wire which is coloured Green
& Yellow must be connected to
the Earth terminal marked with the letter
E or by the earth symbol O
or coloured Green or Green & Yellow.
The wire witch is coloured Blue must be connected to the terminal
whchis marked with the letter
N or colouredBlue or Black.
The wire witch is coloured Brown must be connected to the terminal
marked with the letter
L or P or colouredBrown or Red.
If in doubt, consult the instructions provided with the equipment
or contact the supplier.
This cablefappliance should
be protected by a suitably rated and
approved HBC mains fuse; refer to the rating information
on the
equipment andlor user instructions for details. As a guide, cable
of
0.75mm2 should be protected by a 3A or 5A fuse. Large conductors
would normally requires
13A types, depending on the connection
method used.
Any moulded mains connector that requires removal /replacement
must be destroyed by removal of any fuse
& fuse carrier and
disposed of immediately, as a plug with bared wires is hazardous if
engaged in
a live socket. Any re-wiring must be carried out in
accordance with the information detailed on this label.
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1.FEATURES AND SAFETY TERMS
The oscilloscope is a general-purpose oscilloscope with features to make it a useful, versatile piece of test equipment
offeringwaveform,frequency, and voltage analysis of frequenciesup to 1OMHz.
The vertical deflection system offers
4 calibrated ranges from 5mV to 5V/div in decade sequence. The vertical
variable control allows continuously variable vertical deflection capability. The input signal may either be capacitively or
directly coupled
by use of the AC - DC switch.
The horizontal amplifier features
6 calibrated sweep rates from 0.lus to lOms/div with a sweep variable control
to allow continuoussweep rate variation. The sweep may be internally triggered from the vertical signal or may
be externally
triggered by a separate input signal.
A free-running AUTO mode is providedfor sweepwithout the presence of a triggering
signal.
A TV triggering mode is offered to aid in stable internal triggering on sometelevision signals.
The horizontaldeflection may also be used with an external input to allowfrequency and phase comparison between two
signals.
The oscilloscopefeatures a short length 75mm round CRT that-allowsthe scope to be small and lightweightfor easy use
and minimum space requirement. The screen is covered with a graticule marked 10units wide and
8 units high for
convenienceand accuratemeasurements.
A lkHz 0.25~square wave is also available on the front panel to allow a quick calibration check of the vertical and
horizontal amplifiersas well
as probe compensationadjustment.
These terms may appear in this manual:
A
WARNING. Warning statementsidentlfyconditionsor practices that could result in injury or loss of life.
CAUTION. Caution statements iden@ condtions or practicesthat could result in damageto this product
or other property.
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These terms may appearon the product:
DANGER indicates an injury hazard irnmedately accessible as you read marking.
WARNING indicates an injury hazard not irnmedlately accessible as you read marking.
CAUTION indicates a hazard to property including the product.
The following symbols may appearon the product:
DANGER A ATTENTION @ ProtectiveGround
High Voltage
Feame or Chassis
Refer to Manual (Earth) Terminal
A Terminal
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VERTICAL SYSTEM
AMPLITUDE CALIBRATOR
I Characteristic Specification Remarks
1
HORIZONTAL SYSTEM
I
Remarks
4 calibrated decade steps
witlun
-3dB
AC: less than 1 kHz
Characteristic
Sensitivity
Frequency bandwidth
Input impedance
Accuracy
L Max. input Voltage
Specification
SmVldivto 5V/div
AC
: 2Hz to IOMHz, DC : DC to lOMHz
1Megohm
-+ 5% less than 35pF
within
3%
6OOVp-p or 300Vpk(DC+ACpeak)less than 1 min
Remarks
Characteristic
Output Voltage
RepetitionRate
1 Input Impedance 1Megohm
-+ 5% less than 35pF
1
1
Specification
0.25Vp-p square wave 1 3%
llcHz i 5%
X-Y OPERATION -
1 ax .~lnpu~voltage 600Vp-p or 300Vpk(DC+ACpeak) 1 I
Sweep Rate
Remarks
witlun -3dB
Characteristic
Sensitivity
Frequencybandwidth
10msIdivto
0. lusldw
Specification
0.1V/div
DC to 500kHz
I
6 calibrated decade steps
phase Merence 3 or less at
1 OkHz I I
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CATHODE RAY TUBE
I Source I INT. EXT I I
Characteristic
Display Area
Graticule
AcceleratingPotential
I
I Sensitivity / INT: 30Hz to 2MHz O.5div,2MHz to lOMHz 1S&v 1 I
Characteristic
Specification
75mrn round screen
8dlv X 1Odlv
1.2kV
Specification I Remarks
1 Input impedance
1 Megohm i: 5% less than 35p~
Remarks
6mm/&v
-
I EXT: 30Hz to 2MHz OSVpp, 2MHz to lOMHz lVpp
Mode
Max. Input Voltage
AUTO,
NORM, EXT, TV
600Vp-p or 300V@C+AC peak)
POWER SOURCE
DIlWENSIONS
AND WEIGHT
Characteristic
Line Frequency 5OHz to 60Hz I
Line Voltage I AC 115V/22OV/23OV I
Specification
Characteristic
Dimensions
Weight
Remarks
Power Consumption approximately3OW
Specification
132mrnWide X 2lOmm High x 298mm Long
approximately
4.6kg
7
Remarks
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A WARNING
~m"&c*-&y.~- -
m - s. lmcm NI m.7 .* -@
.-m-m.BDLm*\-
-.,"-,D--
Fig.2. Rear Panel
Fig. 1. Front Panel
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ID[.PANELCONTROLS AND FUNCTIONS
(see Fig. 1 and 2)
FOCUS
I~djuststhe focus of the trace or spot.
POWER
INTENSITY
Turns oscilloscopeon when in the ON position.
Used to adjust the brightness of the Qsplay.Thedisplaybecomes brighterwhen the knob is rotatedclockvvlse
t+ POSITION l~hiswill move the &splay left or right.
SWP. VAR.
CAL 0.25Vp-p
TIMEIDN
LEVEL
TRIGGER
MODE
l~ariesthe sweeprates to valuesbetween the settingsof the TIMEDIV selector. Sweep rates are
calibratedwhen-thlk control is rotated fully clocGse.
Provides a square wave signal of approximately0.25Vpp at lkHz for frequencycompensation of the
input probe andfrequencycalibration check.
Selects calibrated horizontal sweeprates from 0.lusldiv to 10msfdivin
6 decade ranges when the
SWP.VAR.control is in the
CAL position.
Rotahon performs trigger LEVELadpstmentand plshplll action changes SLIM5 dtriggenng + or - .
LEVI3L:Rotationof thscontrol adjuststhe voltage level of the input signal on whrch triggering takes
place.
CCW rotation (-) came a more negative voltage point triggering and CW (+) rotation
causesa more positive voltagepoint triggering.
SL0PE:The sweepis triggered on the positive-going slope of the triggering waveform when the switch
is pushed in and on the negative-goingslope of the triggering waveform when the switch
is
pulled out (PULL, SLOPE(-)).
Selectsthe operatingmode for the trigger circuit.
AUT0:Automatically provides sweeptriggering in the absence of an input signal(fiee run). povides
triggered sweepoperationto some degree when
an input signal is present.
N0RM:The
sweg, ullll not start without an input trigger signal. Thsis the norma1,triggeredsweep mode.
TV: The input signal is filteredbefore being fed to the triggering circuits to provide more stable
triggering
on some television video signals.
X-Y:
Thsposition of the switch disconnectsthe sweep circuits and allowsa signal to be applied to
the horizontal circuitsfrom the EXT INPUTjack.
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10 SOURCE Selectsthe sourceof the trigger signal.
INT: The trigger signal is derived from the &splayedwaveform.
EXT: The trigger signal is derived from a separate signal appliedto the EXT.INPUTjack.
11
EXT
Inputjack for external horizontal input or external trigger.
12 GND Groundterminal.
13 INPUT This iswhere vertical input signal are applied.
14
DC BAL
Thscontrol shouldbe so adjusted that the baseline of trace is not vertically slufted when VERT.VAP
nobe is turned.
15
GND SWITCH Connects the input to the vertical amplfier to ground for an interference-free reference &splay. In thic
position the vertical inputjack is disconnected.
-
16 AC-DC Selectsthe input couplingmode.
AC: Vertical input is capacitively coupled so that the DC component is blocked.
DC: The input signal isdirectly coupled to thevertical amplifier.
17 VOLTS/DIV Thisvaries the vertical deflection height of
an input voltage. It provides 4 decade ranges from SmV/dlr
to 5V/divwhen the VERT. VAR. control is in the
CAL position.
18
T.1 POSITION Allows movement of the display up or down.
19 VERT. VAR.
Tlus varies the vertical deflection height between the settings of the VOLTSDIV selector. The vertica
deflection is calibratedwhen tlus controlis in the fully clockurlse CAL position.
20 CORD Non detachablepower supply cord.
2 1 FUSE The fuse inside the fuse holder.
250V/0.315A(Time
lag) is used for a normal 115Vsupply linevoltage.
250V/0.2A(Time lag) is used for a normal 220V or 230V supplylinevoltage.
B ROTATION Time base rotation adjustment.
ACCESSORIES
.............. Operation Manual.. .1
Test Lead
.............................. 1
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W. GENERAL EQUIPMENT SAFETY
Followingthe safety rules below will sigrdicantly reduce the possibility of fatal shock.
1. Don't exposeyourself tohigh voltages unnecessarily. Remove protective housings and covers only as necessary. Don't
make test connections when the circuit is ener~zed.Discharge high-voltage capacitors after equipment is de-energzed.
2. Try to use only one hand when making adjustments on live circuits. Avoid inadvertent contact with any parts of the
equipmentbecausecertain faults may cause
high voltagesto be present at unexpectedlocations.
3. Work in an area with dry insulative floor material if possible or use a large mat of insulating material to stand on or put
underyour chair andfeet.
If equipment is moveable, place it on an insulated surfacewhde servicing it.
4. When using a probe, touch only the insulated portion.
5. Know the circuits you are working on and avoid areas of especially high voltages. Remember that line voltages may be
present in some places even with the equipment turned off.
6. Metal parts of equipment with two-wire AC power cords, even with polarized plugs, may not be at ground potential. Ths
not only presents a shock hazard but alsomay cause test equipment damage if chassis potentials are Merent.On two wire
equipmentit is a good idea to use
an isolation transformer in the AC supply.
7. Never work alone. Someonetrained in CPR first aid should be close enoughto render aid if necessary.
V.SPECIAL SAFETY NOTES ABOUT YOUR OSCILLOSCOPE
1. Operation of this scopewith the cover removed exposes voltages ashigh as 1500 volts. Applicable satiety precautions for
worlang around
hgh voltages must be observed.
2. Be surethat the ground prong of the AC power cord is properly grounded. Defeating this feature by use of an improperly-
connectedadapter or non-grounded extension cord or other means may pose a potential shock hazard.
3. When the oscilloscope is used to measure line signals, special precautions are required. Do not connect the input lead
grouvding clip to either side of the line. The clip is already connectedthrough the scope line cord to earth ground, whlch is
common to one side of the line. It may not be readily apparent whch side
is common, and connecting the ground clip tothe
wrong side ofthe line will result in a "short circuit". Bear in mind that many buildings (especially residential) may not be
correctly
wired.
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Vi. PRECAUTIONSTOPROTECT YOUR OSCILLOSCOPE
The followingprecautionswill helpprevent scope damage
1. This scope is designedtobe operated on nominal line voltage of 11 5V,220V or 230V at 50 or 60Hz depending on
how the internal circuit connections are made. Change the operating voltage see the calibration and adjustment
section
of this manual.
2. The internal line fuse shouldbe 250V10.315A(Time lag) for 115Voperation and 250Vl0.2A (Time lag) for 220V,230V
operation.
3. Never allow a small spot of high brillianceto remain stationary on the screen for more than a fewseconds.The phosphor
of the screen may become permanently
damaged inthat spot.
4. Do not apply excessivevoltageto the scope inputjacks and do not apply an externalvoltage to the CAL output terminal.
5. Always connect a cablefrom the ground terminal of the osci~loscopeto the chassis of the equipment being tested. Make
sure the chassis' are not at Merentpotentialsbefore attachngthe ground.
6. Do not place objects on top of the oscilloscopeor otherwise obstmctthe ventilationof the case. This may cause excessive
internal temperaturesand premature component failure.
7. Avoid the followingoperating condition:
a. Direct sunlight
b.
High workmg environmenttemperature and humidity.
c. Vibration or mechanical shock.
d Operation near high-voltage, hgh-current electricalequipment,and strongmagnetic fields.
8.Environmentalconditions:
CAUT1ON:To avoidethe damage to instrument,donot applyvoltagesexceed 600Vpp(DC+ACpeak)
or 212VAC
RMS frequency less than 1kHi.
Indoor use
Altitudeup to 2000m
AmlSient temperature5°C-35°C
Relativehumidity 8O%(max.)
Installation categories I1
Pollution &gree 2
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M. GENERAL OPERATION
1. Initial Set-Up
1.Familiarize yourself with the control locations and functions gwen in the panel controls and Functions section in the
front of this manual.
2. To obtain a basic sweepdisplay(numbers in parentheses indlcate numbered positions on Fig.
1 and 2)
1.Plug the AC power cord into a properly grounded outlet. See the precautionssection concerning outlets.
2. Press the POWER switch @ tothe ON position. The red LED indicator should light; if it fails to light check
that there is power
to the outlet you areusing.
3. Allow at least 20 secondsfor warm-up of the CRT, then set the front panel control asfollows:
- INTENSITY control @ fully clockwise
- GND switch @ in GND position
- T.1 POSlTION @ (vertical position control) in approximatecenter
- +-+ POSITION @ (horizontal position control) in approximatecenter
- TIMEDIVselector @ in lmsPosition
- TRIGGER MODE @ in AUTOPosition
- SWP. VAR. Control @ fully clockwise
4. Ifastraight line trace is not visible, move the ?& POSITION '(V.POS1TION) control @ clockwise or
counterclock\lllseuntil it isvisible.
5. Adjust the t+ POSITION (H.POSITION) control @ so that the sweep line starts at the left-most vertical
graticuleline. Use these control position whenever a basic sweepdisplay is desired.
3. Toobtain a basic signal wavefome display:
1. Setthe scope control for a basic sweep dlsplay.
2. Observeapplicableprecautions and connect the signal to
be observed to the WUT connector 0.
3. Set the VOLTSDIV selector andthe VERT.VAR. control until the trace is of the desired height.
4. Set the TIMEDIV selectorand the SWP.VAR.controlsuntil the desired portion of the waveform is Qsplay.
2. Using Different TriggeringModes
1.SOURCE of Triggering
With the SOURCE switch
@ inthe INTERNAL position the triggering signal is derived from the signal being
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&splayed. If the SOURCEswitch is in the EXTERNAL position the triggering pulse is derived from a signal input to
the EXTERNAL
INPUT jack 0. Thetriggeringmode functionswith SOURCE switch in EXT are the same as given
above, except that triggering does not take place because of the observedwaveform.The LEVEL control functions the
same on
an external trigger input as it does on internal.
2. LEVEL Control - See NORMAL triggering mode.
3. AUTO Triggering
In this mode the sweep is automatically internally triggered in the absence of a triggering signal. It will synchronizeto
a triggering signal and it may
be triggered on either the positiveor negativegoing slope of the incoming vertical signal
by pushing or pulling the LEVEL control
a, however the actual LEVEL control rotation has no effect on the
triggering point. The AUTO mode will function
if the SOURCE is in either INTERNALor EXTERNAL.
4. NORMAL TriggeringMode with SOURCE Switch in INT.
To use normal triggering mode, apply a vertical input signalto the INPUT connector 0. Set the scope controlsfor a
basic signal &splay. Set the MODE switch to the NORM position. The voltage level of the displayed waveform that
triggers the horizontal sweep is now controlledby the LEVEL control
@. If the input is a sine wave, the function of
the LEVEL control is shown in Fig. 3. With the LEVEL control pushed in
(column
(+) in Fig. 3) the trigger will occur on the positive-going
portion of the waveform. When the LEVEL control is pulled out, the
trigger will occur on the negative-going slope of the waveform (column(-)
in Fig. 3) When the LEVEL control is moved clockwise, the triggering
point will move more positive on the waveform (line
B on Fig. 3). If the
LEVEL control is turned counterclockwise,the triggering point will move
more negative on the waveform (line
C on Fig. 3) The display must be at
least one division high to obtain proper triggering. Turningthe trigger
LEVEL control to the extremes may cause the trigger level to be set
beyond the voltages of the &splayed signal. which will result in cessation
of the sweep. In the normal trigger mode, the horizontal sweep will not
begin without a trigger. Once the sweep is triggered, it will make one
sweep at the rate set by the TIMWDIV. and the SWP.VAR control,
then it will wait for the next trigger pulse. Fig.3.Effects of triggering LEVEL control
15
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5.TV Triggering Mode
A television video signal contains severalfrequencies.It may be difficult to get a stable triggered display in the NORM
mode because triggering may take place on different signal componentsfrom sweep to sweep. The TV mode filters out
someof the signal componentsto provide more stabletriggering. Thsmode isfunctional on both internal and external
trigger sources.
6. X-Y Position of theMODE Selector
Thsis not atriggeringmode. When the MODE selector switch is in the
X-Y position, the sweep circuits are
disconnected from the horizontal amplifier and an external signal may be applied to the horizontal circuits through the
EXT
INPUT 0. for use of this function seethe procedure on relative measurementsin this instruction manual.
VIII. APPLICATIONS
1. DC Voltage Measurement (Signal within one of the VOLTSDIV ranges.)
1. Connect the signal to be measured to the vertical INPUTjack. Use the X 10probe if the voltage to be measured is
higher than 40Vp-p, or refer to the section covering signals not within one of the VOLTSDIV ranges. Be sure to
observe inputvoltagelimitations.
2. Set the scope controls to obtain agood waveform display, or, if the signal is DC, a sweep line display. Set the
VOLTSIDIV Control to a value to show a measurable height of display on the screen. The VERT.VAR. control
shouldbe fully clockwise CAL position.
A voltage of 15Vto 40V may be displayed on the 5VIdiv range, 1.5Vto 4V
on the 0.5Vtdiv range, 150mVto 0.4V on the 50mV range, and 15mVto 40mV on the 5mVIdiv range. Each of these
ranges may be multiplied
by 10rf-a X 10probe is used. if the voltage to be measured is not within one of these ranges,
refer tothe section concerning signals not within one of the VOLTSIDIV ranges.
3. Place the GND switchin the GND position.
4. Adjust the V.POSITION control so that the base level line is on one of the vertical graticule divisions low enough to
allowvertical display of the entire signal to
be measured. Do not dsturbthis settingwhile measurement is being made.
5. Press the AC-DC Switch to the DC position and note the sweep line displacement
for a DC signal (see Fig. 4) or total
signal height to the level where measurement is desired.(see Fig. 5) A vertical displacement of at least
3 divisions is
suggestedfor optimum accuracy of measurement. The reference level may be re-checkedby returning the
GND switch
to the
GND position.
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6. Calculate the displayed voltage by multiplying the number of divisions of vertical dsplacement times the setting of the
VOLTSDIV selector times the probe attenuation factor. For examplefor Fig.
4 if the VOLTSDIV selector were set to
O.5V/divand the
X 10probe used, the displayed voltage would be 5 DIV X OSVIdiv X 10(probe factor) = 25 volts
f ----
Vertical
D~spiacement
(position)
- F
Sweep line display wiih
/ AC-DC RNitch in DC
posiuon
Sweep line display
wiih
/ GND switch inGND
position
Sweep line display
with
AC-DC switch in DC
posiHon
-7 ---------
Sweepline display with
GND switch inGND
position
Fig.4. DC voltage measurement Fig.5. DC level of waveform measurement
2. Peak-to-Peak Voltage Measurements (Voltagedsplayable using one of the VOLTSDIV ranges)
1. Connect the signal to be measured to the vertical INPUTjack. Be sure to observe input voltage limitations. Set up the
scope to obtain a good waveform display with the AC-DC switch in the AC position. Set the VERT.VAR. control
fully clockwiseto the CAL position. If the waveform cannot be adequately displayed because it's too high on one
VOLTSDIV scaleand too low
( lessthan 3 divisionsvertical deflection)on the next lower VOLTSDIV ranges, then see
.theprocedure for voltage not within one of the VOLTSDIV ranges.
? For optimummeasurement,the portion of the waveform to be measured should be as centered as possible both
horizontallvand vertically.
3. Adjust the V.POSITION control until the lowest point of the
waveform falls on one of the horizontal graticule lines,
---T- bwest point of
keeping the waveform as close to being centered as possible.
Vertical
measurement on
olizontal graticule
(see Fig. 6) Disflacement line
4. Note the numb'er of divisions of vertical displacement between
1
waveform centered
the upper and lower points of the waveformwhere measurement
-_-- _--.
horizontally
is desired, and multiply this times the setting of the VOLTSIDIV
lIIIITIIII
selector times the probe attenuation factor. For example, in Fig. 6
if the VOLTSDIV selector was in the 5mVIdivposition using the Fig.6. Peak-peak voltage measurement
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x 1 probe then the voltage of the waveform peak to peak would be 6 div of vertical displacement times
SOmVIdiv
X l@robefactor) = 300mVpeak-tepeak.
3. Peak-to-Peak Voltage Measurements (Voltagemeasurementswhen voltage being measuredcannot be Qsplayed on one
of the VOLTSDIV selector positionswith the VERT.VAR.fully clochse)
This added procedure shouldbe used when the vertical deflection obtained from the input signal is too high for the
screen on one VOLTSIDIV scale and less than
3 div high on the next lower VOLTSIDIV scale with the
VERT.VAR. control in the fully clockwise CAL position.
1.Set up the scope controlsfor a normal sweep line display.
2. Connect the
x 1input lead to the 0.25V CAL signal on the front panel.
(Another reference voltage may be used
if higher accuracyis desired)
3. Set the scopecontrols as follows:
'
- SWP.VAR.to CAL
- TIMEDIVto 0.lms
- VOLTSDIV to 50mV
- VERT.VAR. to CAL
4. The displayed square wave should be about 5 divisions high. 5 Qvisions times 50mVper Qvisions times 1 (probe factor)
is 250mV or 0.25V. This is not extremelyaccurate,but it shouldbe
1 3%.
5. Adjust the VERT.VAR. control until the square wave is 2.5 division high. With the VERT.VAR. control left in
this position, all of the VOLTSDIV ranges are multiplied
by 2. The 5VIdiv range is now 10Vper division and the
0.5Vldiv range is now 1.OVIdivetc., as long as the VERT.VAR. control is left in this newlycalibrated position. This
shouldbe accurate enough to make measurementsto within
+- 10%.
6. with the VERT.VAR.control left in this position, follow the procedures for AC or DC voltage measurements and
multiplythe VOLTSDIV control ranges times 2.
4. Waveform Period Measurements
This procedure canbe used to measure the period of a completewaveform, or the duration of any part of a waveform.The
period of the waveform can then
be used to calculatethe frequency.
1. Connect the signal to be measureto the INPUTjack.
2. Set the scope controls to obtain a good Qsplay of the waveform with the SWP.VAR.control in the fully clochse CAL
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