OSCILLOSCOPE CONTROLS AND OPERATION

OSCILLOSCOPE CONTROLS AND OPERATION

FRONT PANEL CONTROLS 

Sr.	Panel Control
No.	Description	No.
	DISPLAY
1	Screen	A	Phosphor or an LCD screen, usually about 100 mm corner to corner.
2	Trace	B	Line drawn by the scope to represent the signal. This line is created by a bright dot moving across the screen at high speed.
3	Graticule	C, D	Screen is overlaid with a grid of horizontal (C) and vertical (D) lines, which divides the screen into squares, called 'major divisions', graticule is usually 10 major divisions wide and 8 tall.
4	Axis	E	The central horizontal and vertical lines are usually thicker than the others and are divided into 'minor divisions', usually five per major division.
	POWER SUPPLY AND CIRCUIT
5	Power ON/OFF	1	Press power push button switch to turn the power on and release to turn the power off.
6	Power lamp	2	This lamp lights when power is turned ON.
	Intensity	3	Control the brightness of the display.
7	Focus	4	Control the sharpness of the display.
8	Trace rotation	5	Screw driver control to adjust horizontal tilt of the trace.
9	Scale illum	6	Used to adjust the scale brightness.
	VERTICAL AXIS SECTION
10	Input BNC	30, 24	Input terminals to CH1/X, CH2/Y inputs.
11	AC-GND-DC	22, 29	Selects the coupling method to the vertical amplifier. AC: Vertical input is connected through a capacitor, only AC component is displayed. GND: Input of vertical amplifier is grounded. DC: Input signal including DC component is displayed.
12	Volts/Div selector	26, 32	Steps attenuator switch from 5mV/div to 10V/div.
13	x5 Mag	20, 36	When pressed, the vertical axis gain is magnified 5 times, and the maximum sensitivity becomes 1mV/div.
14	Position	23, 35	Used to move CH1 or CH2 trace up or down on the CRT screen.
15	Invert	21	When Invert switch is pressed, polarity of the signal to CH2 is inverted.
16	CH1	34	Only the signal applied to CH1 is displayed.
17	CH2	28	Only the signal applied to CH2 is displayed.
18	Dual	28, 34	When both CH1 and CH2 buttons are pushed in, the signals applied to CH1 and CH2 are displayed simultaneously in either chopped or alternate display.
19	ADD	31	Displays the algebraic sum of the CH1 and CH2 inputs. Difference is displayed when the CH2 invert button is pushed in.
	HORIZONTAL AXIS SECTION
20	Time/Div Selector	15	Selects sweep speed from 0.1us/Div to 0.2us/Div in 20 calibrated steps.
21	X-Y	11	Displays the CH1 and CH2 input signal as an X, Y graph. The vertical deflection signal is applied to the CH1 input and the horizontal deflection signal is applied to the CH2 input.
22	Sweep Var	12	When tuned completely clockwise (cal) the sweep is indicated by the Time/Div switch. When turned completely counter clockwise the sweep is less than 1/2.5 of the Time/Div setting.
23	Horizontal Position	14	Used to move the trace in horizontal direction.
24	x5 Mag	9	When pressed, the trace will be magnified by a factor of 5. The sweep time becomes 1/5 of the value indicated on the Time/Div switch.
25	Alt-Mag	8	Displays both the normal trace whose sweep rate is indicated by the Time/Div switch and the magnified trace x5 simultaneously.
26	Trace Separation Control	13	Used to position Magnified trace 1.5 divisions or more from the normal trace
	TRIGGERING
27	Trigger source selector	16	Selects sweep trigger signal source. Int: Input signal applied to CH1 or CH2 becomes the trigger signal. CH2: Input signal applied to CH2 becomes the trigger signal. Line: Power line frequency becomes the trigger signal source. Ext: External signal applied to TRIG input becomes the trigger signal.
28	Ext	19	Input terminal for the external trigger signal.
29	Trig Level	17	Sets the amplitude point on the trigger waveform that will start the sweep.
30	Slope	10	Selects the polarity of the slope the trigger source waveform will start the sweep. (+) slope is selected when the push button is pushed out. (--) slope is selected when the push button is pushed in.
31	Trig Mode	18	Auto: Sweep continuously runs in the auto sweep mode. A trace will be displayed even when the input waveform is not triggered. A stationary waveform will be displayed when the input waveform is properly triggered. Norm: A trace will be displayed only when the input waveform is present and is properly triggered. There will be no trace displayed if there is no input signal or if the input signal is not synchronized. Normal sweep is used when the input signal’s frequency is less than 25Hz. TV-H: Effective when trig mode is set to TV, and is used when the horizontal of the TV signal is to be synchronized. TV-V: Effective when trig mode is set to TV, and is used when the vertical of the TV signal is to be synchronized.
32	Cal 0.5V	7	Outputs a 0.5V P-P 1KHz rectangular wave for calibrating probes.
33	GND	27	This is the grounding terminal.
34	COMP. TEST	40	Switch to change from oscilloscope to component tester. For component testing, X-Y switch must be pushed in for X-Y mode and set both AC-GND-DC switches to GND position.
35	Component Test In	42	Terminals to connect a component or lead wires to a component under test.

Sr.

Panel Control

No.

Description

No.

DISPLAY

1

Screen

A

Phosphor or an LCD screen, usually about 100 mm corner to corner.

2

Trace

B

Line drawn by the scope to represent the signal. This line is created by a bright dot moving across the screen at high speed.

3

Graticule

C, D

Screen is overlaid with a grid of horizontal (C) and vertical (D) lines, which divides the screen into squares, called 'major divisions', graticule is usually 10 major divisions wide and 8 tall.

4

Axis

E

The central horizontal and vertical lines are usually thicker than the others and are divided into 'minor divisions', usually five per major division.

POWER SUPPLY AND CIRCUIT

5

Power ON/OFF

1

Press power push button switch to turn the power on and release to turn the power off.

6

Power lamp

2

This lamp lights when power is turned ON.

Intensity

3

Control the brightness of the display.

7

Focus

4

Control the sharpness of the display.

8

Trace rotation

5

Screw driver control to adjust horizontal tilt of the trace.

9

Scale illum

6

Used to adjust the scale brightness.

VERTICAL AXIS SECTION

10

Input BNC

30, 24

Input terminals to CH1/X, CH2/Y inputs.

11

AC-GND-DC

22, 29

Selects the coupling method to the vertical amplifier.

AC: Vertical input is connected through a capacitor, only AC component is displayed.

GND: Input of vertical amplifier is grounded.

DC: Input signal including DC component is displayed.

12

Volts/Div selector

26, 32

Steps attenuator switch from 5mV/div to 10V/div. 

13

x5 Mag

20, 36

When pressed, the vertical axis gain is magnified 5 times, and the maximum sensitivity becomes 1mV/div.

14

Position

23, 35

Used to move CH1 or CH2 trace up or down on the CRT screen.

15

Invert

21

When Invert switch is pressed, polarity of the signal to CH2 is inverted.

16

CH1

34

Only the signal applied to CH1 is displayed.

17

CH2

28

Only the signal applied to CH2 is displayed.

18

Dual

28, 34

When both CH1 and CH2 buttons are pushed in, the signals applied to CH1 and CH2 are displayed simultaneously in either chopped or alternate display.

19

ADD

31

Displays the algebraic sum of the CH1 and CH2 inputs. Difference is displayed when the CH2 invert button is pushed in.

HORIZONTAL AXIS SECTION

20

Time/Div Selector

15

Selects sweep speed from 0.1us/Div to 0.2us/Div in 20 calibrated steps.

21

X-Y

11

Displays the CH1 and CH2 input signal as an X, Y graph. The vertical deflection signal is applied to the CH1 input and the horizontal deflection signal is applied to the CH2 input.

22

Sweep Var

12

When tuned completely clockwise (cal) the sweep is indicated by the Time/Div switch.

When turned completely counter clockwise the sweep is less than 1/2.5 of the Time/Div setting.

23

Horizontal Position

14

Used to move the trace in horizontal direction.

24

x5 Mag

9

When pressed, the trace will be magnified by a factor of 5. The sweep time becomes 1/5 of the value indicated on the Time/Div switch.

25

Alt-Mag

8

Displays both the normal trace whose sweep rate is indicated by the Time/Div switch and the magnified trace x5 simultaneously. 

26

Trace Separation Control

13

Used to position Magnified trace 1.5 divisions or more from the normal trace

TRIGGERING

27

Trigger source selector

16

Selects sweep trigger signal source.

Int: Input signal applied to CH1 or CH2 becomes the trigger signal.

CH2: Input signal applied to CH2 becomes the trigger signal.

Line: Power line frequency becomes the trigger signal source.

Ext: External signal applied to TRIG input becomes the trigger signal.

28

Ext

19

Input terminal for the external trigger signal.

29

Trig Level

17

Sets the amplitude point on the trigger waveform that will start the sweep.

30

Slope

10

Selects the polarity of the slope the trigger source waveform will start the sweep.

(+) slope is selected when the push button is pushed out.

(--) slope is selected when the push button is pushed in.

31

Trig Mode

18

Auto: Sweep continuously runs in the auto sweep mode. A trace will be displayed even when the input waveform is not triggered. A stationary waveform will be displayed when the input waveform is properly triggered.

Norm: A trace will be displayed only when the input waveform is present and is properly triggered. There will be no trace displayed if there is no input signal or if the input signal is not synchronized. Normal sweep is used when the input signal’s frequency is less than 25Hz.

TV-H: Effective when trig mode is set to TV, and is used when the horizontal of the TV signal is to be synchronized.

TV-V: Effective when trig mode is set to TV, and is used when the vertical of the TV signal is to be synchronized. 

32

Cal 0.5V

7

Outputs a 0.5V P-P 1KHz rectangular wave for calibrating probes.

33

GND

27

This is the grounding terminal.

34

COMP. TEST

40

Switch to change from oscilloscope to component tester. For component testing, X-Y switch must be pushed in for X-Y mode and set both AC-GND-DC switches to GND position.

35

Component Test In

42

Terminals to connect a component or lead wires to a component under test.