B+K precision 2540 Manuale utente

User Manual

Digital Storage Oscilloscopes

Models 2534, 2540 & 2542

Version 1.02

GeneralSafetySummary

General Safety Summary

Review the following safety precautions to avoid injury and prevent

damage to this product or any products connected to it. To avoid potential

hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injury

Use Proper Power Cord. Use only the power cord specified for this

product and certified for the country of use.

Connect and Disconnect Properly. Do not connect or disconnect probes

or test leads while they are connected to a voltage source.

Ground the Product. This product is grounded through the grounding

conductor of the power cord. To avoid electric shock, the grounding

conductor must be connected to earth ground. Before making connections

to the input or output terminals of the product, ensure that the product is

properly grounded.

Connect the Probe Properly. The probe ground lead is at ground

potential. Do not connect the ground lead to an elevated voltage.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe

all ratings and marking on the product. Consult the product manual for

further ratings information before making connections to the product.

Do Not Operate Without Covers. Do not operate this product with

covers or panels removed.

Avoid Exposed Circuitry. Do not touch exposed connections and

components when power is present.

Do Not Operate With Suspected Failures. If you suspect there is

damage to this product, have it inspected by qualified service personnel.

GeneralSafetySummary

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Symbols and Terms on the Product.

Protective Ground (Earth) Terminal.

CAUTION. Refer to user manual. Caution indicates a hazard

to property including this product

GeneralSafetySummary

Contents

5

Contents

Contents ..........................................................................................5

1. Getting Started...............................................................7

Inspect package content......................................................7

Front Panel ............................................................................8

Rear panel ...........................................................................14

Interpreting the display.......................................................15

2. Basic Operation ...........................................................17

Probe Compensation .........................................................17

Using Autoset ......................................................................18

Vertical Controls..................................................................20

CH1, CH2 Menu..........................................................22

REF Function...............................................................39

Horizontal Controls .............................................................42

Trigger Controls ..................................................................55

ACQUIRE Menu..................................................................67

UTILITY Menu .....................................................................78

MEASURE Menu ................................................................91

SAVE/LOAD Menu ...........................................................106

CURSOR Menu.................................................................117

DISPLAY Menu .................................................................123

RUN Controls ....................................................................126

3. Application Examples................................................129

Make Simple Measurements ..........................................129

Contents



6

Capture a Single-Shot Signal......................................... 131

Reduce the Random Noise on a Signal ....................... 133

Trigger on a Video Signal ............................................... 135

PASS/FAIL Measurement............................................... 138

Waveform Recorder ........................................................ 140

Cursor Measurements..................................................... 144

4. System Message and General Problems ............. 151

System Message.............................................................. 151

General Problems ............................................................ 154

5. Specifications and Characteristics ......................... 157

Characteristics.................................................................. 157

Appendix A: Service and Warranty Information .................. 165



Getting Started

7

1.Getting Started

Inspect package content

Inspect the shipping container for damage. If the shipping

container and/or packaging material are damaged, it should

be kept until the content of the shipment has been checked

for completeness and the oscilloscope has been checked

mechanically and electrically.

Verify that you received the following items:

zOscilloscope

zTwo high performance 150MHz oscilloscope probes

zPower cord

zUser Manual

zTest report

zComsoft Installation disk

zUSB data cable

If the content is incomplete or if there is any mechanical

damage or defect, please contact your authorized distributor.

Getting Started



8

Front Panel

This section provides an introduction to the front panel of the

model 2534 and 2540 series oscilloscopes. Generally, you

set up the front panel controls first and then make your

measurements.

The keys or knobs on the front panel bring up softkey menus

on the display that provide further access to the

oscilloscope’s features. The entry knob is usually used to

select or change values. Five softkeys are located along the

right side of the display screen.

The following figure shows the front panel of the 2534/2540

series oscilloscopes.

Front panel

Getting Started

9

1. PRINT key

Press this key to print the current display to a USB mass

storage device.

2. AUTO key

When you press the AUTO key, the oscilloscope will

quickly determine which channels are active and

automatically scale the display to show the signals on

these channels.

3. Entry knob

The Entry knob is used to select items from menus and

input values. Its function changes when a different menu

is displayed. The curved arrow symbol to the left of

the Entry knob lights up when the Entry knob is active

and can be used to select a value.

4. Utility and Save/Load Menu

UTILITY

Access the system utility functions, such as Language

Setup, I/O Setup, and Print Setup etc.

SAVE/LOAD

You can save your current setup and waveform data to

the oscilloscope’s internal memory or to a USB mass

storage device and retrieve the setup or waveform later.

5. Measure and Waveform Menu

MEASURE

Getting Started



Perform automated measurements of waveform

parameters.

ACQUIRE

The ACQUIRE menu lets you set the oscilloscope to

acquire waveforms in Normal, Peak Detect, or Average

mode and lets you select Real Time or Equivalent

sampling.

CURSOR

Press the CURSOR key to activate the cursors for

making custom voltage or time measurements on scope

signals.

DISPLAY

You can change the appearance of waveforms and the

display screen, select the color schemes, and adjust the

contrast, etc.

6. RUN control keys

The RUN/STOP key will be green when the oscilloscope

is waiting for a trigger event. When the trigger mode is

set to Normal, the display will not update until a trigger

event occurs. If the trigger mode is set to Auto, the

oscilloscope looks for a trigger; if no trigger is found, it

will be triggered automatically and the input signals will

be displayed.

Getting Started

11

Press the RUN/STOP key again to stop acquiring data.

The RUN/STOP key will be red. Now you may examine

the acquired waveform by panning and zooming.

Press the SINGLE key to acquire a single waveform

trace. The key will remain orange until the oscilloscope is

triggered. After the trigger event, the waveform is

displayed and triggering is disabled until re-armed by

pressing the SINGLE key again.

7. Vertical controls

You can use the vertical position control knob to move

the waveforms up or down on the display. There is one

vertical position control knob for each channel.

You can press the channel key CH1 or CH2 to switch the

channel on or off or access the associated channel menu

via the softkeys. There is one channel on/off key for each

channel.

You can press the MATH key to access the FFT (Fast

Fourier Transform), multiply, subtract, and add functions.

You can press the REF key to save or load a reference

waveform from the internal memory or an external USB

mass storage device.

You can use the vertical scale control knob to change the

vertical scale of a waveform. The waveform display will

Getting Started



contract or expand relative to the ground reference level.

There is one vertical scale control knob for each channel.

8. Horizontal controls

When the oscilloscope is in run mode, the horizontal

position control knob lets you set the acquisition window

relative to the trigger point. When acquisition is stopped,

you can turn this knob to pan through the stored

waveform data horizontally. This lets you see the

captured waveform before or after the trigger.

Press the horizontal MENU key to access the menu

where you can activate a delayed sweep or select X-Y or

Roll modes.

Turn the horizontal sweep rate control knob to adjust the

sweep speed. This changes the time base on the

display. When adjusted after the waveform has been

acquired and the oscilloscope is stopped, this has the

effect of stretching or compressing the waveform

horizontally.

9. Trigger controls

These controls are used to control how the oscilloscope

triggers to capture waveforms.

10. Probe compensation terminals

Getting Started

13

Use these two probe compensation terminals to match

each probe’s characteristics to the oscilloscope channel

to which it is connected.

11. External trigger input

This is the external trigger input BNC connector.

12. Channel input BNC

This is the channel’s input BNC connector. Connect the

oscilloscope probe or BNC cable to the BNC Connector.

13. MENU On/Off key

Press this key to toggle the menu display on and off.

14. Softkeys

Five menu softkeys are used to select the control and

parameter setting functions. Each softkey has a label

along the right side of the screen.

15. Power switch

Press once to turn power on, press again to turn power

off.

16. LCD display

The 320*240 matrix (5.7 inch) LCD displays captured

waveforms, setup information, measurement results, and

softkeys for setting up parameters.

Getting Started



Rear panel



Rear panel

1. Line input receptacle

AC power cord receptacle. Attach to an AC power line

with a safety ground.

2. USB connector

The USB device connector can be connected to a

computer.

3. Extension port

Connect optional extension communication modules.

Contact B&K Precision for availability.

21

3

Getting Started

15

Interpreting the display

The oscilloscope display contains channel acquisition

information, setup information, measurement results, and soft

keys for setting up measurement parameters.

Interpreting the display

1. Readout shows the real time clock.

2. The USB icon displays when a USB device is connected.

3. Acquisition status readout shows RUN, STOP, WAIT, or

ROLL.

4. The square brackets show the location of the current

display window within the recorded waveform. The

Getting Started



record line color corresponds to the selected waveform

color.

5. The trigger position icon shows the trigger location within

the record.

6. The trigger position icon shows the trigger location in the

current displayed waveforms.

7. This readout shows the frequency of the trigger signal.

8. The trigger status readout shows the trigger status.

9. These are soft keys which allow you to set up additional

parameters.

10. The display area contains the displayed waveforms,

channel identifiers, and trigger and ground level

indicators. The channel information is shown in the same

color as the channel’s waveform.

11. This readout shows the delay setting or the trigger

location within the record, trigger source, trigger type,

and trigger level.

12. The horizontal readout shows the Main or Delayed time

base setting.

13. The channel readouts show the scale factor, coupling,

bandwidth limit, digital filter, and invert status.

14. Waveform baseline icons show the zero-volt levels of the

waveforms. The icon colors correspond to the waveform

colors.

Basic Operation

17

2.Basic Operation

Probe Compensation

Perform this adjustment to match your probe to the input

channel. This should be done whenever you attach a passive

probe for the first time to any input channel. A poorly

compensated probe can introduce measurement errors.

1. Connect the oscilloscope probe to channel 1. Connect

the probe tip to the 3Vp-p@1kHz terminal and connect

the probe’s ground lead to the chassis ground terminal,

then press the AUTO key.

2. Use a nonmetallic tool to adjust the trimmer capacitor on

the probe for the flattest pulse possible. The trimmer

capacitor is located on the probe BNC connector.

Correctly compensated

Over compensated

Under compensated

Basic Operation



3. Connect probes to all other oscilloscope channels.

Repeat the procedure for each channel. This matches

each probe to each channel.

Using Autoset

The 2534 & 2540 series digital storage oscilloscopes provide

the Autoset function which sets the vertical, horizontal, and

trigger controls automatically.

Autoset function finds, turns on, and scales any channel with

a repetitive waveform that has a frequency of at least 50 Hz,

a duty cycle greater than 0.5% and an amplitude of at least

10 mV peak-to-peak. Any channels that do not meet these

requirements are turned off.

When you are using more than one channel, the Autoset

function sets the vertical controls for each channel and uses

the lowest-numbered active channel to set the horizontal and

trigger controls.

To configure the oscilloscope quickly and automatically,

press the AUTO key to display the connected signals that are

active.

To configure the oscilloscope to display multiple cycles,

press the Multi-Cycle softkey in the AUTO menu.

To configure the oscilloscope to display a single cycle, press

the Single Cycle softkey in the AUTO menu.

Basic Operation

19

To undo the effects of Autoset, press the Undo Autoset

softkey in the AUTO menu before pressing any other key.

This is useful when you have unintentionally pressed the

AUTO key or do not like the settings Autoset has selected

and want to return to your previous settings.

to set oscilloscope channel 1

Basic Operation



Vertical Controls



Vertical controls

Vertical Position Control (CH1, CH2)

Turn the small vertical position knob above the channel key

to move the channel’s waveform and its ground level icon ( )

up or down on the display. The voltage value momentarily

displayed in the bottom left portion of the display represents

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