Tektronix 2235 Manuel du propriétaire

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TEKTRONIX 2235 OSCILLISCOPE

CONTROLS, CONNECTORS, AND INDICATORS

The following descriptions are abstracted from the Tektronix operator’s manual,

which is intended to familiarize the operator with the location, operation, and

function of the instrument's controls, connectors, and indicators on the Tektronix

2235 Oscilloscope.

POWER, DISPLAY, AND PROBE ADJUST CONTROLS

(1) InternalGraticuules - Eliminateparallaxviewingerror betweenthetrace and graticulelines, rise-time

amplitudeand measurementpointsareindicatedattheleftedgeofthegraticule.

(2)POWERSwitch-Turns instrumentpoweron and off.

(3)Power Indicator-AnLEDthatilluminateswhen

power isavailabletotheinstrumentand thePOWER

switchissettoON (button in).

(4)FOCUS Control-Adjustsforoptimumdisplaydefinition.

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(5)PROBE ADJUST Connector-Providesanapproximately0.5-V, negative-going, square-wavevoltage(at

approximately1kHz) thatpermitsanoperator tocompensatevoltageprobesand tocheckoperation of

theoscilloscopeverticalsystem. Itisnotintendedforverifyingtheaccuracyoftheverticalgainor time-

base circuitry.

(6)BEAMFIND Switch-Whenheldin, compressesthedisplaytowithinthegraticulearea and providesa

visibleviewingintensitytoaidinlocatingoff-screendisplays.

(7) TRACE ROTATIONControl -Screwdriver adjustmentPress infor ON;press againfor OFF. Usedto

aligntheCRTtrace withthehorizontalgraticulelines.

(8) A and B INTENSITYControls-Determinethebrightness ofthe Aand theBSweeptraces.

VERTICAL CONTROLS

(9) CH 1 VOLTS/DIV and CH 2 VOLTS/DIV Switches-Used to select the vertical

deflection factor in a 1-2-5 sequence. To obtain a calibrated deflection factor,the

VOLTS/DIV

variable control must be in the calibrated (CAL) detent (fully clockwise).'

1X-Indicates the deflection factor selected when using either a

1X probe or coaxial cable.

1OX PROBE-indicates the deflection factor selected when using a 1OX probe.

(10) VOLTS/DIV Variable Controls-When rotated counterclockwise out of their

calibrated detent positions,these controls provide continuously variable,

uncalibrated deflection factors between the calibrated settings of the VOLTS/DIV

switches.

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(11) CH 1 OR X and CH 2 OR Y Connectors-Provide for application of external signals

to the inputs of the vertical deflection system or for an X-Y display. In the X-Y

mode, the signal connected to the CH 1 OR X connector provides horizontal

deflection, and the signal connected to the CH 2 OR Y connector provides vertical

deflection.

(12) Input Coupling (AC-GND-DC) Switches-Used to

select the method of coupling input signals to the vertical deflection system.

AC-Input signal is capacitively coupled to the vertical amplifier. The dc component

of the input signal is blocked. Low-frequency limit (-3 dB point) is approximately

10 Hz.

GND-The input of the vertical amplifier isgrounded to provide a zero (ground)

reference-

voltage display (does not ground the input signal). This switch position allows

precharging the input coupling capacitor.

DC-All frequency components of the input signal

are coupled to the vertical deflection system.

(13) INVERT Switch-inverts the Channel 2 display when

button is pressed in. Push button must be pressed in a second time to release it and

regain a noninverted display.

(14) VERTICAL MODE Switches-Two three-positions switches and two push-button

switches are used select the mode of operation for the vertical amplifier system.

CH 1-Selects only the Channel 1 input signal for display.

BOTH-Selects both Channel 1 and Channel 2 input signals for display. The BOTH

position must be selected for either ADD, ALT, or CHOP operation.

CH 2-Selects only the Channel 2 input signal for display.

ADD-Displays the algebraic sum of the Channel 1 and Channel 2 input signals.

ALT-Alternately displays Channel 1 and Channel 2 input signals. The alternation

occurs during retrace at the end of each sweep. This mode is useful for viewing both

input signals at sweep speeds from 0.05microsec. per division to 0.2 ms per

division.

CHOP-The display switches between the Channel 1 and Channel 2 input signals during

the sweep,The switching rate is approximately 500 khz. This mode is useful for

viewing both Channel 1 and Channel 2 input signals at sweep speeds from 0.5 ms per

division to 0.5 s

per division.

TRIG VIEW-Press in and hold this push button to display a sample of the signal

present in the A Trigger amplifier (for all A SOURCE switch settings). All other

signal displays are removed while the TRIG VIEW push button is held in.

BW LIMIT-When pressed in, this push-button switch limits the bandwidth of the

vertical amplifier to approximately 20 MHz. Push button must be pressed a second

time to release it and regain full 100-MHz bandwidth operation. Provides a method

for reducing interference from high-frequency signals when viewing low frequency

signals.

(15) POSITION Controls-Used to vertically Position the display on the CRT. When the

SEC/DIV switch is set to X-Y, the Channel 2 POSITION control moves the display

vertically (Y-axis), and the HorizontalPOSITION control moves the display

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horizontally(X-axis).

(16) GND Connector-Provides direct connection to the instrument chassis ground.

(17) SERIAL and Mod Slots-The SERIAL slot is imprinted with the instrument's serial

number. The Mod slot contains any option number that is installed in the instrument.

HORIZONTAL CONTROLS

(18) A and B SEC/DIV Switches-Used to select the sweep speeds for the A and B Sweep

generators in a 1-2-5 sequence. To obtain calibrated sweep speeds, the A and B

SEC/DIV Variable control must be in thecalibrated detent (fully clockwise).

A SEC/DIV-The calibrated sweep speed is shown between the two black lines on the

clear plastic skirt. This switch also selects the delay time for delayed-sweep

operation when used in conjunction withthe 8 DELAY TIME POSITION control.

B SEC/DIV-The B Sweep speed is set by pulling out the (DLY'D SWEEP PULL) knob and

rotating

it clockwise to a setting opposite the white line scribed on the knob. The B Sweep

circuit is used only for delayed-sweep operation.

(19) A and B SEC/DIV Variable Control -provides continuously variable, uncalibrated

A Sweep speeds to at least 2.5 times the calibrated setting. It extends the slowest

sweep speed to at least 1.25 s per division.

(20) X10 Magnifier Switch-To increase displayed sweep speed by a factor of 10, pull

out the A and B SEC/DIV Variable knob. The fastest sweep speed can be extended to 5

ns per division. Push in the A and B SEC/DIV Variable knob to regain the X1 sweep

speed.

(21)HORIZONTAL MODE Switch-This three-position switch determines the mode of

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operation for the horizontal deflection system.

A-Horizontal deflection is provided by the A Sweep generator at a sweep speed

determined by

the A SEC/DIV switch setting.

ALT-Alternates the horizontal displays between the A Sweep (with an intensified

zone) and the B Delayed Sweep. The A Sweep speed is determined by the setting of the

A SEC/DIV switch. The B Sweep speed and the length of the intensified zone on the A

Sweep are both determined by the B SEC/DIV switch setting.

The B provides b-Horizontal deflection Sweep generator at a sweep speed determined

the B SEC/DIV switch setting. The start of the B Sweep is delayed from the start of

the A Sweep by a time determined by the settings of both the A SEC/DIV switch and

the B DELAY TIME POSITION control.

(22) A/B SWP SEP Control -Vertically positions the B Sweep trace with respect to the

A Sweep trace when ALT HORIZONTAL MODE is selected.

(23) B DELAY TIME POSITION Control-Selects the amount of delay time between the

start of the A Sweep and the start of the B Sweep. Delay time is variable from 0.5

times to 10 times the A SEC/DIV switch setting.

(24)POSITION Control -Horizontally positions both the A Sweep and the B Sweep

displays and horizontally positions X-axis in the X-Y mode.

TRIGGER CONTROLS

(25)A TRIGGER Mode Switches-Three push-button

switchesthatdeterminethetrigger modefortheA

Sweep.

SGL SWP RESET-Press inthespring-returnpush button momentarilytoarmtheASweepcircuit

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for asingle-sweepdisplay. ThismodeoperatesthesameasNORM, exceptonlyonesweepisdis-

playedfor eachtrigger signal. Another sweepcannotbedisplayeduntil theSGLSWP RESET

push button ismomentarilypressedinagaintoresettheASweepcircuit. Thismodeisusefulfor

displayingand photographingeithernonrepetitivesignalsorsignalsthatcauseunstableconventional

displays(e.g., signalsthatvaryinamplitude, shape, or time).

P-PAUTO-TVLINE-Permitstriggeringon waveformshavingrepetition ratesofatleast20 Hz and

television lines. Sweepfree-runs intheabsence ofanadequatetrigger signalorwhentherepetition

rateisbelow20 Hz. Therange oftheATRIGGER LEVELcontrolisrestrictedtothepeak-to-peak

rangeofthetrigger signal.

NORM-Sweepisinitiatedwhenanadequatetrigger signalisapplied. Intheabsence ofatrigger

signal, no baselinetrace will bepresent.

TVFIELD-Press inbothP-P AUTOand NORMpush buttons. Permitstriggeringon television field

signals.

(26)TRIG'DREADY Indicator-TheLEDilluminateswheneither the P-P AUTOor the NORMTrigger

Modeisselectedtoindicate thattheASweepistriggered(TRIG'D). WhentheSGLSWP RESET

button ismomentarilypressedin,theLEDilluminatestoindicatethattheATrigger circuit isarmed

(READY) for a single-sweepdisplay.

(27) A TRIGGERLEVEL Control-Selectstheamplitudepointon thetriggersignalatwhichthesweepis

triggered.

(28)SLOPE Switches-Selecttheslopeofthesignalthattriggersthesweep.

OUT:-Whenpush button isreleasedout,sweepistriggeredfromthepositivegoingslopeofthetrigger signal

IN: -Whenpush button ispressedin, sweepistriggeredfromthenegative-goingslopeofthetrigger signal.

(29)A SOURCESwitch -Determinesthesource ofthetrigger signalthatiscoupledtotheinputoftheA

Trigger circuit.

INT-Permitstriggeringon signalsthatareappliedtotheCH1ORXand CH2ORYinputconnectors. The

source oftheinternalsignalisselected by the A & B INT switch.

LINE-Selects the power-source waveform as the source of the trigger signal. This

trigger source is useful when vertical-input signals are time related (multiple or

submultiple) to the frequency of the power-source voltage.

EXT-Permits triggering on signals applied to the EXT INPUT connector.

(30) A & B INT Switch-Selects the source of the internal triggering signal when the

A SOURCE switch is set to INT.

CH 1-The signal applied to the CH 1 OR X input connector is the source of the

trigger signal.

VERT MODE-The internal trigger source is determined by the signals selected for

display by the VERTICAL MODE switches.

CH 2-The signal applied to the CH 2 OR Y input connector -is the source of the

trigger signal.

(31) A EXT COUPLING Switch -Determines the method used to couple external signals to

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the A Trigger circuit from the EXT INPUT connector.

AC-Signals above 60 Hz are capacitively coupled to the input of the A Trigger

circuit. Any dc components are blocked, and signals below 60 Hz are attenuated.

DC-All components of the signal are coupled to the input of the A Trigger circuitry.

This position is useful for displaying low-frequency or low-repetition-rate signals.

DC 1/10th-External trigger signals are attenuated by a factor of 10. All components

of the signal are coupled to the input of the A Trigger circuit.

(32)EXT INPUT Connector-Provides a means of introducing external signals -into the A

Trigger circuit through the A EXT COUPLING switch.

(33) TRIGGER LEVEL Control-Selects the amplitude point on the trigger signals at

which the sweep is triggered. When fully clockwise (B RUNS AFTER DLY), the 8 Sweep

circuit runs immediately following the delay time selected by the A SEC/DIV switch

and the B DELAY TIME POSITION control.

(34) VAR HOLDOFF Control-Provides continuous control of holdoff time between sweeps.

Increases the holdoff time by at least a factor of 10. This control improves the

ability to trigger on aperiodic signals(such as complex digital waveforms).

Return to Home Page Return to Review of Measurement

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