VOLTCRAFT DSO-111 Manual de usuario

DSO-111 Oscilloscope

Quick Guide

Table of Contents

1. General Safety Requirements.................................................................................. 1

2. Safety Terms and Symbols....................................................................................... 2

3. User Guidebook........................................................................................................... 4

Structure of the Oscilloscope................................................................................................ 4

Front Panel...............................................................................................................................................4

Rear Panel............................................................................................................................................... 6

General Inspection.................................................................................................................... 7

Basic Operation......................................................................................................................... 7

Probe Compensation................................................................................................................8

Set the Probe Attenuation Coefficient................................................................................. 9

Use the Probe Safely................................................................................................................ 9

X-Y Mode....................................................................................................................................10

4. Troubleshooting........................................................................................................ 12

5. Appendix...................................................................................................................... 13

Appendix A: Enclosure..........................................................................................................13

Appendix B: General Care and Cleaning.......................................................................... 13

1.General Safety Requirements

1. General Safety Requirements

Before use, please read the following safety precautions to avoid any

possible bodily injury and to prevent this product or any other connected

products from damage. To avoid any contingent danger, ensure this product

is only used within the range specified.

Only the qualified technicians can implement the maintenance.

To avoid Fire or Personal Injury:

Connect the probe correctly. The grounding end of the probe

corresponds to the grounding phase. Please don't connect the

grounding end to the positive phase.

Use Proper Power Cord. Use only the power cord supplied with the product

and certified to use in your country.

Connect or Disconnect Correctly. When the probe or test lead is connected

to a voltage source, please do not connect and disconnect the probe or test

lead at random.

Product Grounded. This instrument is grounded through the power cord

grounding conductor. To avoid electric shock, the grounding conductor must be

grounded. The product must be grounded properly before any connection with

its input or output terminal.

When powered by AC power, it is not allowed to measure AC power

source directly, because the testing ground and power cord ground

conductor are connected together, otherwise, it will cause short circuit.

Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings

and markers of this product. Refer to the user's manual for more information

about ratings before connecting to the instrument.

Do not operate without covers. Do not operate the instrument with covers or

panels removed.

Use Proper Fuse. Use only the specified type and rating fuse for this

instrument.

Avoid exposed circuit. Do not touch exposed junctions and components

when the instrument is powered.

Do not operate if in any doubt. If you suspect damage occurs to the

instrument, have it inspected by qualified service personnel before further

operations.

Use your Oscilloscope in a well-ventilated area. Make sure the instrument

installed with proper ventilation, refer to the user manual for more details.

Do not operate in wet conditions.

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry.

2.Safety Terms and Symbols

2. Safety Terms and Symbols

Safety Terms

Terms in this manual. The following terms may appear in this manual:

Warning: Warning indicates the conditions or practices that could result

in injury or loss of life.

Caution: Caution indicates the conditions or practices that could result in

damage to this product or other property.

Terms on the product. The following terms may appear on this product:

Danger: It indicates an injury or hazard may immediately happen.

Warning: It indicates an injury or hazard may be accessible potentially.

Caution: It indicates a potential damage to the instrument or other property might

occur.

Safety Symbols

Symbols on the product. The following symbol may appear on the product:

Hazardous Voltage

Refer to Manual

Protective Earth Terminal

Chassis Ground

Test Ground

2.Safety Terms and Symbols

To avoid body damage and prevent product and connected equipment damage,

carefully read the following safety information before using the test tool. This

product can only be used in the specified applications.

Warning:

In X-Y mode, the X Input and Y Input of the oscilloscope are not electrically

isolated. The channels should adopt a common ground during measuring.

To prevent short circuits, the 2 probe grounds must not be connected to 2

different non-isolated DC levels.

The diagram of the oscilloscope ground wire connection:

Warning:

To avoid fire or electrical shock, when the oscilloscope input

signal connected is more than 42V peak (30Vrms) or on circuits of

more than 4800VA, please take note of below items:

Only use accessory insulated voltage probes and test lead.

Check the accessories such as probe before use and

replace it if there are any damages.

Remove probes, test leads and other accessories

immediately after use.

Do not apply input voltages above the rating of the

instrument because the probe tip voltage will directly

transmit to the oscilloscope. Use with caution when the

probe is set as 1:1.

Do not use exposed metal BNC or banana plug connectors.

Do not insert metal objects into connectors.

3.User Guidebook

3. User Guidebook

Structure of the Oscilloscope

This chapter makes a simple description of the operation and function of the front

panel of the oscilloscope, enabling you to be familiar with the use of the

oscilloscope in the shortest time.

Front Panel

Figure 3- 1 Front panel

No.

Name

Description

Display screen

Display the trace.

Run/Stop

Enable or disable sampling on input signals.

Var (right side)

Provides continuously variable sweep rate. Turn

clockwise until the waveform does not change is the

calibration position.

◁▷Position

Horizontal positioning control of trace on the screen.

3.User Guidebook

Level

Control signal trigger to sweep at certain level.

Towards "-": The triggering level moves downward

on the display waveform.

Towards "+": The triggering level moves upward on

the display waveform.

Time/DIV

Select the sweep rate.

Lock

When the Lock button is pressed down, the

triggering level is automatically maintained at

optimum value irrespective of the signal amplitude,

requiring no manual adjustment of triggering level.

Norm/Auto/TV

Select the desired trigger mode.

Auto: a single trace shown on screen even no

signal. Automatically reverts to triggered sweep

operation when adequate triggered signal is present.

Needs to adjust the Level.

Norm: No trace on screen if no signal. Trace is only

generated when adequate trigger signal is present.

TV: Used to show TV signals.

X Input

When switching to XY mode, it’s X input terminal.

When switching the trigger source to Ext, it’s external

trigger input terminal.

Int/Line/Ext

Switch to select the Trigger Source.

Int: Select internal signal as trigger source signal.

Line: Select AC power line as trigger signal.

Ext: The external signal applied through X Input

terminal is used for the external triggering source

signal.

CAL signal

Provide calibration square wave for 0.5Vpp range,

frequency=1kHz. Used for adjusting probe

compensation and adjusting the vertical & horizontal

sensitivity.

CAL ground

Ground wire connector of the calibration signal.

AC/DC/

Switch for selecting coupling mode.

AC: Block the DC component of the input signal.

DC: Pass both AC and DC components of the input

signal.

(GND): Disconnect the input signal.

Y Input

Vertical input terminal.

3.User Guidebook

+/-/XY

+: Trigger on rising slope. Triggering occurs when

the triggering signal crosses the triggering level in

positive-going direction.

-: Trigger on falling slope. Triggering occurs when

the triggering signal crosses the triggering level in

negative-going direction.

XY: This position is used when using the instrument

as an X-Y oscilloscope.

Volts/DIV

Adjusting sensitivity of vertical system.

△

▽Position

Control vertical position of trace on the screen.

Var (left side)

Continuously adjusting the sensitivity of vertical

system. Turn clockwise until the waveform does not

change is the calibration position.

Power switch

Main power on/off.

Rear Panel

Figure 3- 2 Rear Panel

3.User Guidebook

No.

Name

Description

AC Power input

connector

Connect the supplied AC power cord to this

connector.

Fuse holder

Fuse rating is 1A, T class, 250 V.

General Inspection

After you get a new oscilloscope, it is recommended that you should make a check

on the instrument according to the following steps:

1. Check whether there is any damage caused by transportation.

If it is found that the packaging carton or the foamed plastic protection cushion

has suffered serious damage, do not throw it away first till the complete device

and its accessories succeed in the electrical and mechanical property tests.

2. Check the Accessories

The supplied accessories have been already described in the "Appendix A:

Enclosure" of this manual. You can check whether there is any loss of

accessories with reference to this description. If it is found that there is any

accessory lost or damaged, please get in touch with the distributor of our

responsible for this service or our local offices.

3. Check the Complete Instrument

If it is found that there is damage to the appearance of the instrument, or the

instrument can not work normally, or fails in the performance test, please get in

touch with our distributor responsible for this business or our local offices. If

there is damage to the instrument caused by the transportation, please keep

the package. With the transportation department or our distributor responsible

for this business informed about it, a repairing or replacement of the instrument

will be arranged by the us.

Basic Operation

1. Set the switches and controls on the front panel as shown below.

Position for control switches

Item

No. in Figure 3- 1 Front panel

Setting

Power switch

○pressed down

Volts/DIV

0.1 V

Norm/Auto/TV

Auto

Time/DIV

0.5 ms

+/-/XY

3.User Guidebook

Int/Line/Ext

Int

AC/DC/



Lock

Pressed down

2. Connect the power cord to the AC line outlet. Press the power switch ○ — on

the front panel to power on, the screen will light up. A few seconds later, a trace

will appear on the screen.

3. Align the trace with the horizontal center line of the graticule by adjusting the

△

▽Position knob.

4. Connect the probe to the Y Input terminal and apply the 0.5Vpp CALIBRATOR

signal to be probe tip.

5. Set the AC/DC/switch to the AC state. A square waveform will be displayed

on the screen.

6. For signal viewing, set the Volts/DIV switch and Time/DIV switch in appropriate

positions so that signal waveform is displayed clearly.

7. Adjust the △

▽Position and ◁▷Position controls in appropriate positions so that

the displayed waveform is aligned with the graticule and voltage and period

can be read conveniently.

Probe Compensation

When connect the probe with the input channel for the first time, make this

adjustment to match the probe with the input channel. The probe which is not

compensated or presents a compensation deviation will result in the measuring

error or mistake. For adjusting the probe compensation, please carry out the

following steps:

1. Set the switch in the probe to 10X. (see "Set the Probe Attenuation Coefficient"

on P9).

2. Connect the probe BNC connector to the Y Input terminal. Connect the probe

tip to the calibration signal on the front panel (see 11 of Figure 3- 1 Front panel).

Connect the reference wire clamp to the ground wire connector of the

calibration signal (see 12 of Figure 3- 1 Front panel).

3. Check the displayed waveforms and regulate the probe till a correct

compensation is achieved (see Figure 3- 3 and Figure 3- 4).

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