Equipment information:

Leader LBO-308S Oscilloscope
Manufacturer:
Leader
Model: LBO-308S
Date:
Category: Measurement instruments
Group: Oscilloscope
Description: Dual trace Oscilloscope
Information:
                                    The model LBO-308S is a high-quality dual-trace, 20-MHz
portable oscilloscope ideally suited for field service. It
is an extremely compact, lightweight, general-purpose
instrument, designed to provide accurate signal measurements
for either bench or field service. The highly sensitive
vertical amplifier provides calibrated deflection
sensitivity from 2 mV/div to 10 V/div. The time base
provides stable triggering over the full bandwidth of the
vertical amplifier as well as calibrated sweep speeds from
0.2 sec/div to 0.5 µsec/div. A times 5 magnifier extends the
maximum sweep speed to 0.1 µsec/div.

The instrument may be operated from either 117/234 volts AC,
11 to 30 volts DC, or from battery pack.

The model LBO-308 features a 3-inch rectangular 8 X 10
division CRT, mounted horizontally, with an internal
graticule which provides for accurate and sharp displays at
any viewing angle without parallax errors.

These manuals are available for the above equipment:

Leader -- LBO-308S -- Service and User Manual
File name: Leader-5693-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 68
Size: 10.08 Mbytes (10568551 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: 89812c02ac34053256a280b048e04ae4
ed2kID: 95224c031cd0b6d14eee4100b352d057
Downloads: 518 since 04 April 2014
Information:
Leader-5693-Manual-Page-1-Picture
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Leader -- LBO-308S -- Service and User Manual
File name: Leader-9525-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 68
Size: 10.08 Mbytes (10568551 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: 5166d5902c572341aef26051561925a2
ed2kID: f2db0e51a1e88dad5f23a05563bc8195
Downloads: 6 since 12 September 2017
Information:
1,	GENERAL
INFORMATION...........................................- • •	I

1-1 INTRODUCTION
..................................................... •	1

1-2	SPECIFICATIONS
............................................................1

2.	OPERATING INSTRUCTIONS
............................................	3

2.-1 FUNCTION OF CONTROLS, CONNECTORS, AND
INDICATORS.................. . . .	3

2-1-1 Display Block. . . . .
......................................................3

2-1-2 Vertical Amplifier
Block.....................................................3

2-1-3 Sweep and Trigger
Block..........................................................................................4

2-1-4
Miscellaneous.........................................................................................................5

2-2	INITIAL OPERATION
..............................____.................	5

2-2-1 Power Connections and Adjustments . . .
................................ . .	5

AC
operation................................................. .
. . .	5

DC
operation...........................................................................................7

LP-2054 battery pack......
..............................................7

2-2-2 Installation
......................................................	7

2-2-3 Preliminary Control Settings and Adjustments
.....................................................7

2-3 BASIC OPERATING PROCEDURES
...............................................................8

2-3-1 Singnal
Connections..............................................................8

2-3-2 Single-trace Operation
...............................................	9

2-3-3 Triggering
Alternatives....................................................................................9

Trigger mode selection. .
...............................................................9

Trigger source
options...............................................	10

Trigger point selection.
..............................................	10

2-3-4 Probe Compensation and
Use..................................................12

2-3-5 Dual-trace Operation. . .
............................................ .	12

2-3-6 Additive and Differential Operation
......................................	14

2-3-7 X-Y Operation
....................................................	15

2-3-8 Intensity Modulation.
...............................................	15

2-4 MEASUREMENT APPLICATIONS .
_____....____............................	15

2-4-1 Amplitude
Measurements............................................ .	15

Peak-to-peak voltages
...............................................................................15

Instantaneous voltages.
..................................................................................16

2-4-2 Differential Measurement
Techniques.....................................	16

2-4-3 Time Interval
Measurements...........................................	16

Basic
technique...............................................................16

Period, pulse width, and duty cycle
......................................	17

Lead and lag
time..................................................	.18

2-4-4 Phase Difference Measurements19

Dual-trace method
....................................................................................19

Lissajous pattern method
............................................	19

2-4-5 Distortion Comparison.
......................................................................................20

2-4-6 Frequency
Measurements.......................................................20

Reciprocal
method.............................................. . . .	20

Comparison method
................................................	21

2-4-7 Risetime Measurements
..................................... . . ........22
3. PERFORMANCE CHECK
......................................................23

3-1 INTRODUCTION
................................................................................23

3-2 TEST EQUIPMENT REQUIRED...........-.................. ■
....................23

3-3 PRELIMINARY
PROCEDURE......................................•............23

3-3-1 Equipment Preparation
........................................................23

3-3-2 Initial Control
Settings.......................................................23

3-4 DEFLECTION ACCURACY
......................................................24

3-4-1 Equipment
Required................................................................^4

3-4-2 C 1:1-1 and CH-2 Deflection Accuracy
.....................................	24

3-4-3 X-axis
Gain............................................................24

3-5 BANDWIDTH . ............................
...............................24

3-5-1 Equipment Required............
.............................................24

3-5-2 CH-1'and CH-2 Bandwidth
............................................	24

3-5-3 X-Axis Bandwidth. . . .
...........................................................................................25

3-6 TRIGGERING
................................................................................25

3-6-1 Equipment
Required......................................................25

3-6-2 50-Hz Triggering.
.............................................-..........25

3-6-3 20-MHz
Triggering..................................................................................................25

3-6-4 Z-Axis Modulation . . . .
..................................................27

3-7 SWEEP TIME ACCURACY
...............................................................................27

3-7-1 Equipment Required
..............................................................................27

3-7-2 Sweep Time Accuracy ..........
.........................................................................27

3-7-3 Magnified Sweep
Accuracy...................................................27

3-8 TV TIGGERING.
.................----.................................	28

3-8-1 Equipment
Required.....................................................28

3-8-2 TV Sync
Triggering...........................................................28

3-9 X-Y MODE DIFFERENCE •
.....................................................................28

3-9-1 Equipment
Required................................................................28

3-9-2 Phase
Measurement.................................................	28

4, ADJUSTMENT AND CALIBRATION PROCEDURES
.........................	30

4-1. PREPARATION
.........................................................................................30

4-1-1 Test Equipment and Tools .
.........................................................................30

4-1-2 Disassembly.
.....................................................	30

4-1-3 Warmup and Preliminary
Set-up............................................................................30

4-2 POWER. SUPPLY . „ .
.......................................
.......................30

4-2-1 Voltage Checks and Adjustments	30

4-2-2 Battery Lower-Limit
Adjustment.......................................................31

4-2-3 Charge Rate Adjustment
.................................................................31

4-3 DISPLAY
CIRCUITS....................................................	31

4-3-1 Blanking
Circuits....................................................................................................31

4-3-2 Intensity Range
Adjustment..............................................3.1.

4-3-3 Geometry
Adjustment...............................................	31

4-3-4 Astigmatism
Adjustment..............................................................................32

4-3-5 Z-Axis Modulation. Check. . . . .
..............................................................32

4-4 VERTICAL AMPLIFIER
.....................................................................................33

4-4-1 Step Attenuator Balance Adjustment
.....................................	33

4-4-2 Balance
Adjustment................................................................................................33
4-4-3 ADD Ba.lao.ce Adjustment.........

44-4 Output Amplifier Adjustments.....

44-5 Gain Calibration ..............

44-6 Step Response and Frequency Check. .

4-5 TIMEBASE ...................

4-5-1. TIME/DIVCalibration. . . . .......

4-5-2 Horizontal Position Centering ......

4-5-3 Sweep Length. Adjustment ........

4-6 TRIGGER CIRCUIT .................

4-6-! LEVEL Balance Adjustment. ......

4-6-2 Trigger Sensitivity Checks. ........

4-7 X-Y CIRCUITRY ....................

4-8 CALIBRATION ...................

REPLACEMENT PARTS LIST ........

BLOCK DIAGRAM AND SCHEMATICS
Leader-9525-Manual-Page-1-Picture
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