The Oscilloscope @

8/2/2019 The Oscilloscope @

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The Oscilloscope

First Looks : Controls & Indicators

Prepared by:

Jay-R M. Ballon

MAIE-IT


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1. CH1 Position Control

Rotation of this knob will

adjust the vertical position

of the Channel 1 waveformon the screen. In the X-Y

operation, rotation adjusts

vertical position of display.


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2. CH1 Volts/Div Control & Variable

Control

For the Volts/Div Control, it is avertical attenuator for channel 1.Provides step adjustment of verticalsensitivity in 1-2-5 sequence.VARIABLE control is turned to the

CAL position, the calibrated verticalsensitivity is obtained. In X-Yoperation, this control serves as theattenuator for Y-axis.

Rotation of the variable controlprovides fine control of channel 1vertical sensitivity. In the fullyclockwise (CAL) position, the verticalattenuator is calibrated. In X-Yoperation, this control serves as theY-axis attenuation fine adjustment.


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3. CH1 AC-GND-DC Switch

This switch is the Channel 1 vertical axiscoupling mode selector, for X-Yoperation, the Y-Axis coupling modecontrol.

AC:

AC Input coupling with blocking ofany DC signal component.

GND:

Vertical amplifier is disconnectedfrom the input signal and connectedto ground. This mode is useful indetermining the zero reference.

DC:

DC Coupling, with both the DC andAC components of the input signaldisplayed on the CRT.


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4. CH1 INPUT Jack

Vertical input for channel 1

trace in normal sweep

operation. Y-axis input for X-Y

operation.


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5. CH2 Position / PULL INVert Control

CH2 Position:

Rotation adjusts vertical

position of channel 2 trace.

INV:Push-pull switch selects

channel 2 signal inverted when

pulled out.


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6. CH2 Volts/Div Control & Variable

Control Volts/Div Knob:

For the Volts/Div Control, it is a verticalattenuator for channel 1. Provides stepadjustment of vertical sensitivity in 1-2-5sequence. VARIABLE control is turned to

the CAL position, the calibrated verticalsensitivity is obtained. In X-Y operation,this control serves as the attenuator forX-axis.

Variable Control:

Rotation of the variable control provides

fine control of channel 1 verticalsensitivity. In the fully clockwise (CAL)position, the vertical attenuator iscalibrated. In X-Y operation, this controlserves as the X-axis attenuation fineadjustment.


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CH2 AC-GND-DC Switch

Three position lever switch whichoperates as follows :

AC:

Blocks DC Component of channel 2input signal.

GND:

Opens signal path and grounds inputto vertical amplifier. This provides azero-signal base line, the position ofwhich can be used as a referencewhen performing DC measurements.

DC:

Direct input of AC and DC componentof channel 2 input signal.


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8. CH2 INPUT Jack

Vertical input for channel 2

trace in normal sweep

operation. X-axis input in X-Yoperation.


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9. MODE SwitchSelects the basic operating mode of the oscilloscope.

CH1:

Only the input signal to channel 1 is displayed as a

single trace.

CH2:

Only the input signal to channel 2 is displayed as a

single trace. ALT:

Alternate sweep is selected regardless of sweep time.

CHOP:

Chop sweep is selected regardless of sweep time at

approximately 300 KHz.

ADD:The waveforms from channel 1 and channel 2 inputs

are added and the sum is displayed as a single trace.

When the CH2 INV Button is engaged, the waveform

from channel 2 is subtracted from the channel 1

waveform and the difference is displayed as a single

trace.


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10. GND Terminal

Earth and chassis ground

reference.


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11. CAL Terminal

Provides 1 kHz, 1 V peak-to-

peak square wave signal. This is

useful for probe compensationadjustment.


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12. EXT Trigger Input Jack

Input terminal for

external sync signal.

When SOURCE switch

is selected in EXTposition, the input

signal at the EXT TRIG

input jack becomesthe trigger.


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13. Power Switch

A press of this switchturns the power ON.


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14. Power Indicator

Lights when thePOWER switch is

pressed.


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15. Intensity (REAL) Control

Controller for adjusting

the brightness of the

real-time waveform.


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16. Focus / PULL Astig Control

FOCUS: Focusadjustment

ASTIG: Used to bring

the waveform into thebest condition with theFOCUS adjustment byadjusting trace and

spot aberration. Pullthe knob to make aspot circular.

17 S l Ill / PULL T R t


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17. Scale Illum / PULL Trace Rota

Control

SCALE ILLUM:

Brightness adjustment of thescale of the CRT. Forphotographing, rotate the knob

to adjust bright to preventhalation caused by too brightillumination.

TRACE ROTA:

Tilt adjustment of thehorizontal bright line in thecase where geomagnetisminfluences the bright line to tilt.


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18. Variable SWEEP TIME/DIV Control

A SWEEP Time / Div Control

Range select dial of 19 ranges from0.2us/div to 0.5s/div.To calibrate the set value, rotatethe SWEEP VARIABLE controllerclockwise up to the CAL position.

B SWEEP Time / Div ControlRange select dial of 17 ranges from50ms/div to 0.2us/div. Set this dialto a value same as the A SWEEPTime/Div Control or higher than it.

A SWEEP Variable Control

Fine sweep time adjustment. In thefully clockwise (CAL) position, thesweep time is calibrated.

19 H i t l P iti / PULL 10X


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19. Horizontal Position / PULL 10X

Magnification Control

Horizontal position

controller, which provides

horizontal shift of

waveform. By pulling the

knob, the sweep time is

quickened ten times.

In the X-Y operation,

rotation adjusts horizontal

position of display.


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20. Level / PULL Slope (-) Control

LEVEL:

Trigger level adjustment

determines point on

triggering waveformwhere A sweep

triggered.


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21. Hold Off Control

HOLD OFF:

Adjusts hold off (trigger inhibitperiod beyond sweep duration).Clockwise rotation from theNORM position increases hold off

time, up to 10 times at the MAXposition (fully clockwise).

Trace Separation Control

Adjusts vertical separationbetween A sweep and B sweep(control has effect only in the ALT

of HORIZ. MODE). Clockwise rotation increases

separation; B sweep moves downwith respect to A sweep up to 4divisions.


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22. Coupling Switch

Selects coupling for sync trigger signal.

AC:

Trigger is AC coupled. Blocks DCcomponent of input signal; mostlycommonly used position.

HFrej:

Sync signal is DC coupled through a low-pass filter to eliminate high frequencycomponents for stable triggering of lowfrequency signals.

DC:The sync signal is DC coupled for syncwhich includes the effect of DCcomponents.

TV FRAME:Vertical sync pulses of a composite videosignal are selected for triggering.

TV LINE:Horizontal sync pulses of a composite videosignal are selected for triggering.


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23. Source Switch

Sweep trigger source select switch.

VERT MODE:The sweep trigger source is selected withthe MODE selector for the verticaloperation. When the vertical MODEselectors set to CH1, the channel-1 signalis used as a trigger source. When is ser to

CH2, the channel 2 signal is used as atrigger source. When ser to ALT both thechannel 1 and channel 2 signals are usedalternatively. When set to CHOP or ADD,the channel 1 signal is used as a triggersource.

CH1:Channel 1 signal is used as a triggersource.

CH2:Channel 2 signal is used as a triggersource.

LINE:Sweep is triggered by line voltage.


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24. Triggering Mode Control

Selects triggering mode.

AUTO:Triggered sweep operation when trigger signalis present, automatically generates sweep inabsence of trigger signal.

NORM:Normal triggered sweep operation. No trace ispresented when a proper trigger signal is not

applied. X-Y:

X-Y operation. Channel 1 input signalproduces vertical deflection (Y-axis). Channel2 input signal produces horizontal deflection(X-axis).This operates regardless vertical MODEselection.

SINGLE:Single sweep mode

RESET:Reset mode of single sweep operation. whenreset, the switch returns to the SINGLEposition, with the READY LED lighting untilcompletion of the sweep.


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26. Horizontal Mode Switch

Used to select the horizontal displaymode.

A:Only A sweep is operative, with the Bsweep dormant.

ALT:

A sweep alternates with the B sweep.For this mode of operation, the Bsweep appears as an intensifiedsection of the A sweep.

B:Only delayed B sweep is operative.

X-Y:

Channel 1 becomes the Y-axis andchannel 2 becomes the X-axis for theX-Y operation. The setting of thevertical MODE and TRIG MODEswitches have no effect.


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27. Delay Time Position Control

Used to set delay time

of the B sweep start

point from the A sweep

start point, if the HORIZ

MODE selector is set toALT or B position. (Delay

time position) It controls

delay time continuously

between 0,2 and 10times of a set value with

the A sweep time/div

controller.


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28. CRT Screen

This is where all the

output signals will be

displayed.


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29. Test Probe

The test probe


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THANK YOU ;)

Prepared by: Jay-R M. Ballon

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