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B+K precision 2552 User Manual

4ch/2ch digital storage oscilloscopes
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Model:
2552, 2553, 2554, 2555, 2556,
2557, 2558, 2559
4CH/2CH Digital Storage
Oscilloscopes
USER MANUAL

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Summary of Contents for B+K precision 2552

  • Page 1 Model: 2552, 2553, 2554, 2555, 2556, 2557, 2558, 2559 4CH/2CH Digital Storage Oscilloscopes USER MANUAL...

  • Page 3: Safety Summary

    Safety Summary The following safety precautions apply to both operating and maintenance personnel and must be observed during all phases of operation, service, and repair of this instrument. Before applying power, follow the installation instructions and become familiar with the operating instructions for this instrument. If this device is damaged or something is missing, contact the place of purchase immediately.
  • Page 4 Do not attempt any internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present. DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT Do not install substitute parts or perform any unauthorized modifications to this instrument. Return the instrument to B&K Precision for service and repair to ensure that safety features are maintained.

  • Page 5: Safety Symbols

    Compliance Statements Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European countries with separate collection systems) This product is subject to Directive 2002/96/EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment (WEEE) , and in jurisdictions adopting that Directive, is marked as...
  • Page 6 Category I overvoltage conditions. NOTES: All references and functionality related to CH3 (channel 3) and CH4 (channel 4) in this manual are available on 4CH models 2553, 2555, 2557, and 2559. They are not available for 2CH models 2552, 2554, 2556 and 2558.

  • Page 7: Table Of Contents

    Table of Contents SAFETY SUMMARY ..............3 CHAPTER 1 INTRODUCTION ............10 ............ 11 ANEL AND ISPLAY NFORMATION Front Panel ..................11 Back Panel ..................12 Display Information ................13 ................ 15 ACKAGE ONTENTS ..............15 HECKING UNCTIONS ................17 ROBE AFETY ..............
  • Page 8 Signal Source ..................50 Trigger Type ..................50 Coupling .................... 68 Position ..................... 68 Slope and Level ................. 68 Trigger Holdoff .................. 69 ............70 IGNAL CQUISITION YSTEM ................75 ISPLAY YSTEM X-Y Format ..................79 ................80 EASURE YSTEM Scale Measurement ................
  • Page 9 X-Y F ............138 PPLICATION OF UNCTION ....... 139 NALYZING A IFFERENTIAL OMMUNICATION IGNAL CHAPTER 5 MESSAGE PROMPTS AND TROUBLESHOOTING..141 ..............141 ESSAGE ROMPTS ............... 142 ROUBLESHOOTING CHAPTER 6 SPECIFICATIONS ............ 144 ................144 PECIFICATIONS ................151 ERTIFICATION APPENDIX A DEFAULT SETUP........... 152 APPENDIX B INDEX ..............

  • Page 10: Chapter 1 Introduction

    Chapter 1 Introduction The 2550 series digital storage oscilloscopes (DSO) are portable benchtop instruments used for making measurements of signals and waveforms. This chapter will highlight information on the following: • Panel and display information • Package Contents • Checking functions •...

  • Page 11: Panel And Display Information

    Panel and Display Information Front Panel The following contents are a brief introduction for the front panel function, which is useful to become familiar with the operation of the DSO. 12 13 Figure 1 - 4 channel (top) and 2 channel (bottom) front panels...

  • Page 12: Back Panel

    Power On/Off button USB Host port (for storage to USB flash drives) LCD display 1 kHz probe compensation terminal Menu On/Off button Function keys Print button Universal knob Cursor, Measure, Acquire, Display, Save/Recall, Utility menu buttons 10. Help and default setup button 11.

  • Page 13: Display Information

    Rubber feet Kensington security slot Pass/Fail BNC output LAN interface USB device port (for remote communication) Rear USB host port (for storage to USB flash drives) Main AC power switch Input fuse holder AC line input 10. Carrying handle Display Information 9 10 Figure 5 - Display Screen Trigger status...
  • Page 14 • Trig’d - The oscilloscope has seen a trigger and is acquiring the post-trigger data. • Stop - The oscilloscope has stopped acquiring waveform data. Auto - The oscilloscope is in auto mode and is acquiring • waveforms in the absence of triggers. Scan - The oscilloscope is acquiring and displaying •...

  • Page 15: Package Contents

    13. Shows the icon for the trigger type 14. Displays real time and date 15. Shows the trigger voltage 16. Trigger signal frequency Package Contents The digital storage oscilloscopes are shipped with the following contents: • 2550 series Digital Storage Oscilloscope •...
  • Page 16 Figure 6 - Scope Layout Set the switch to 1X on the probe and connect the probe to channel 1 on the oscilloscope. To do this, align the slot in the probe connector with the key on the CH 1 BNC, push to connect, and twist to the right to lock the probe in place.

  • Page 17: Probe Safety

    Figure 8 - 3Vpp Square Wave Press “CH1” two times to cancel the channel 1, Press“CH2” to change screen into channel 2, reset the channel 2 as step 2 and step 3. Do the same for 4CH models by pressing “CH3” and “CH4” for channel 3 and channel 4 respectively.

  • Page 18: Probe Attenuation

    Note： To avoid electric shock when using the probe, keep fingers behind the guard on the probe body. To avoid electric shock while using the probe, do not touch metallic portions of the probe head while it is connected to a voltage source. Connect the probe to the oscilloscope and connect the ground terminal to ground before you take any measurements.

  • Page 19: Probe Compensation

    Probe Compensation As an alternative method to Probe Check, you can manually perform this adjustment to match your probe to the input channel. Figure 10 - Probe Compensation Setup Set the Probe option attenuation in the channel menu to 10X. Do so by pressing CH1 button and selecting “Probe”...

  • Page 20: Chapter 2 Functions And Operating Descriptions

    Chapter 2 Functions and Operating Descriptions This chapter will cover all the functions and operations of the oscilloscope: • Menu and control button • Connector • Auto Setup • Default Setup • Universal knob • Vertical System • Horizontal System •...

  • Page 21: Menu And Control Button

    Menu and Control Button Figure 11 - Control Buttons (4CH model shown) Channel buttons (CH1, CH2, CH3, CH4): Press a channel button (CH1, CH2, CH3, or CH4) to turn that channel ON or OFF and open the Channel menu for that channel. You can use the channel menu to set up a channel. When the channel is ON, the channel button is lit.
  • Page 22 HORI MENU: Press to display the Horizontal menu. You can use the Horizontal menu to display the waveform and to zoom a segment of a waveform. TRIG MENU: Press to display the Trigger menu. You can use the Trigger menu to set the trigger type (Edge, Pulse, Video, Slope, Alternate and trigger settings.

  • Page 23: Connectors

    UTILITY: Press to open the Utility menu. You can use the Utility menu to configure oscilloscope features, such as sound, language, counter, etc. You can also view system status and update software. DEFAULT SETUP: Press to reset the oscilloscope’s settings to the default factory configuration.

  • Page 24: Auto Setup

    Note: Do not connect a voltage source to the ground terminal or it may damage the oscilloscope. Auto Setup The 2550 series Digital Storage Oscilloscopes have an Auto Setup function that identifies the waveform types and automatically adjusts controls to produce a usable display of the input signal.
  • Page 25 Table 1 - Autoset Menu Option Description Auto set the screen and display multi-cycle signal. (Multi-cycle sine) Set the screen and auto display single cycle signal. (Single-cycle sine) Auto set and show the rising time. (Rising edge) Auto set and show the falling time. (Falling edge) Causes the oscilloscope to recall the previous setup.

  • Page 26: Default Setup

    VOLTS/DIV Coarse adjustability Signal inverted Horizontal position Center TIME/DIV Adjusted Trigger type Edge Trigger source Auto detect the channel which has the input signal Trigger slope Rising Trigger mode Auto Trigger coupling Trigger holdoff Minimum Trigger level Set to 50% Note: The AUTO button can be disabled.

  • Page 27: Universal Knob

    Universal Knob Figure 14 - Universal Knob You can use the Universal knob with many functions, such as adjusting the hold off time, moving cursors, setting the pulse width, setting the video line, adjusting the upper and lower frequency limit and adjusting X and Y masks when using the pass/fail function.

  • Page 28: Vertical System

    Vertical System The vertical control could be used for displaying waveform, rectify scale and position. Figure 15 - Vertical System Controls...

  • Page 29: Channel Function Menu

    Channel Function Menu Table 3 - Channel Function Menu Option Setting Description Coupling DC passes both AC and DC components of the input signal. AC blocks the DC component of the input signal and attenuates signals below 10 Hz. GND disconnects the input signal. BW Limit Disables bandwidth limit.
  • Page 30 Filter Press this button to enter the “Digital Filter menu”. Next Page Page 2/3 Press this button to enter the third page menu. Table 5 - Channel Function Menu 3 Option Setting Description Unit Set the scale unit to voltage. Set the scale unit to current.
  • Page 31 Option Setting Description Filter Turn on the digital filter. Turn off the digital filter. Type Setup as LPF (Low Pass Filter). Setup as HPF (High Pass Filter). Setup as BPF (Band Pass Filter). Setup as BRF (Band Reject Filter). Upp_limit Turn the “Universal”...

  • Page 32: Setting Up Channels

    Setting Up Channels Each channel has its own separate Menu. The items are set up separately according to each channel. Setup Channel Coupling Take CH1 for example; the tested signal is a sine wave signal with DC deflection: • Press“CH1”→“Coupling”→“AC”, Set to AC couple mode. This will block the DC component of the input signal.
  • Page 33 Figure 17 - Bandwidth Limit Volts/Div Settings Vertical scale adjust have Coarse and Fine modes, Vertical sensitivity range of 2 mV/div – 10 V/div. Take CH1 for example: • Press“CH1”→“Volts/Div”→“Coarse”. It is the default setting of Volts/Div, and it makes the vertical scaling in a 1-2-5-step sequence from 2 mV/div, 5 mV/div, 10 mV/div to 10 V/div.
  • Page 34 • Press CH1”→ Volts/Div”→ Fine”. This setting changes the vertical control to small steps between the coarse settings. It will be helpful when you need to adjust the waveform vertical size in smaller steps. Setting Probe Attenuation In order to set the attenuation coefficient, you need to specify it in the channel operation Menu.
  • Page 35 Figure 20- Invert Waveform Screen Using the Digital Filter Press “CH1”→“Next Page page 1/2”→ “Filter”, display the digital filter menu. Select “Filter Type”, then select “Upper Limit” or “Lower Limit” and turn the “Universal” knob to adjust them. • Press “CH1”→“Next Page page 1/2”→ “Filter” →“Off”. Turn off the Digital Filter function.

  • Page 36: Using Vertical Position Knob And Volts/Div Knob

    Figure 22 - Digital Filter Adjustment Screen Using Vertical Position Knob and Volts/div Knob • Vertical “POSITION” knob Use the Vertical “POSITION” knobs to move the channel waveforms up or down on the screen. This button’s resolution varies based on the vertical scale. When you adjust the vertical position of channel waveforms, the vertical position information will display on the bottom left of the screen.

  • Page 37: Math Functions

    decrease by turning the knob in the counterclockwise direction. In Fine mode, the knob changes the Volts/Div scale in small steps between the coarse settings. Again, increase in the clockwise direction, decrease in the counterclockwise direction. Math Functions Math shows the results after +,-,*, /, and FFT operation between two channels, from CH1 to CH4 (CH3 and CH4 available for 4CH models only).

  • Page 38: Fft Function

    Table 8 - Math Function Description Operation Setting Description Source A waveform adds Source B ＋ waveform. Source A waveform is subtracted － from Source B waveform. Source A multiply Source B Source A divides Source B Fast Fourier Transform. Figure 23- Math Waveform FFT Function The FFT process mathematically converts a time-domain signal into its...
  • Page 39 • Show the Noise in a DC power supply • Test the filter and pulse response in a system • Analyze vibration Table 9 - FFT Function Menu 1 FFT Option Setting Description Source CH1, CH2, Select this channel as the FFT source. CH3*, CH4* Window Hanning...

  • Page 40: Displaying The Fft Spectrum

    The oscilloscope calculates the FFT spectrum using the center 1024 points of the time-domain waveform. Turn the “Volts/div” knob to ensure that the entire waveform remains on the screen. Turn the “Time/div” knob to provide the resolution you want in the FFT spectrum. If possible, set the oscilloscope to display many signal cycles.

  • Page 41: Select Fft Window

    Figure 24 - Math Function Screen Sampling Set dBVrms to Time base rate be the vertical scale Scale unit Select FFT Window Windows reduce spectral leakage in the FFT spectrum. The FFT assumes that the YT waveform repeats forever. With an integral number of cycles, there are no discontinuities in the signal shape.

  • Page 42: Magnifying The Fft Spectrum

    spectrum. Hanning Better frequency, poorer Sine, periodic, and Hamming magnitude accuracy than narrow-band random Rectangular. Hamming has noise. Asymmetric slightly better frequency transients or bursts. resolution than Hanning. Blackman Best magnitude, worst Single frequency frequency resolution. waveforms, to find higher order harmonics.
  • Page 43 If FFT display on full screen, press CH1 button again to remove channel waveform display. Press the “CURSOR” button to enter “Cursor” menu. Press the “Cursor Mode” button to select “Manual”. 10. Press the “Type” option button to select “Voltage”. 11.
  • Page 44 Figure 26 - Measuring FFT Frequency NOTE： - The FFT of a waveform that has a DC component or offset can cause incorrect FFT waveform magnitude values. To minimize the DC component, choose AC Coupling on the source waveform. To display FFT waveforms with a large dynamic range, use the dBVrms scale.

  • Page 45: Using Ref

    Using REF The reference control saves waveforms to a nonvolatile waveform memory. The reference function becomes available after a waveform has been saved. Table 12 - REF Function Menu Option Setting Description Source CH1,CH2, Choose the waveform display to store. *CH3, *CH4 CH1 off...
  • Page 46 Figure 27 - Reference Waveform Menu Operation step: Press the “REF” menu button to display the “Reference waveform menu”. Press the “Source” option button to select input signal channel. Turn the vertical “POSITION” knob and “Volts/div” knob to adjust the vertical position and scale. Press the third option button to select “REFA”...

  • Page 47: Horizontal System

    Horizontal System Shown below, there is one button and two knobs in the HORIZONTAL area. Table 13 - Horizontal System Function Menu Option Setting Description Delayed Turn on this function for main timebase waveform to display on the top half screen and window timebase waveform to display on the below half...

  • Page 48: Window Zone

    Used to change the horizontal time scale to magnify or compress the waveform. If waveform acquisition is stopped (using the RUN/STOP or SINGLE button), turn the Time/div knob to expand or compress the waveform. Select the horizontal Time/div (scale factor) for the main or the window time base.

  • Page 49: Trigger System

    Figure 28 - Horizontal Delay Menu Turn the “Horizontal Position” knob (adjust window’s position) to select the window that you need and expanded window waveform display will show on the below half of the screen at the same time. Trigger System The trigger determines when the oscilloscope starts to acquire data and display a waveform.

  • Page 50: Signal Source

    signal to the EXT TRIG BNC and set the trigger source to Ext or Ext/5. • “FORCE Button: Use the FORCE button to complete the current waveform acquisition whether the oscilloscope detects a trigger or not. This is useful for SINGLE acquisitions and Normal trigger mode.
  • Page 51 Does not display the trigger signal; the Ext option uses the signal connected to the EXT TRIG front- panel BNC and allows a trigger level range of - 1.2 V to +1.2 V. EXT/5 Same as Ext option, but attenuates the signal by a factor of five, and allows a trigger level range of +6 V to -6 V.
  • Page 52 Blocks DC components, attenuates signals below 25 Hz. Attenuates the high-frequency components above HF Reject 150 kHz. Blocks the DC component attenuates the low- LF Reject frequency components below 8 kHz. Holdoff Using the “universal” knob to adjust holdoff time (sec), the holdoff value is displayed.
  • Page 53 Press the “Slope” option button to select “ ” , “ ” or “ ”. Set up Trigger mode Press the “Trigger mode” option button to select “Auto”, “Normal”, “Single”. Auto: The waveform refreshes at a high speed whether the trigger condition is satisfied or not. Normal: The waveform refreshes when the trigger condition is satisfied and waits for next trigger event occurring when the trigger condition is not satisfied.
  • Page 54 When Select how to compare (Positive pulse width less than the trigger pulse relative pulse width setting) to the value selected in the Set Pulse Width (Positive pulse width larger option. than pulse width setting) (Positive pulse width equal to pulse width setting) (Negative pulse width less than pulse width setting)
  • Page 55 Table 17 - Pulse Trigger Function Menu 2 Option Setting Description Type Pulse Select the pulse to trigger the pulse matching the trigger condition. Mode Auto Select the type of triggering. Normal Normal mode is best for most Pulse Width single trigger applications.
  • Page 56 Video Trigger Trigger on fields or lines of standard video signals. Table 18 - Functional Menu of Video Trigger 1 *Available for 4CH models only. Option Setting Description Type Video Select the video type trigger. Set the coupling to AC to trigger the NTSC, PAL and SECAM video signal.
  • Page 57 Figure 32 - Video Trigger Screen Table 19 - Functional Menu of Video Trigger 2 Option Setting Description Type Video Select the video type trigger. Set the coupling to AC to trigger the NTSC, PAL and SECAM video signal. Standard NTSC Select the video standard for sync Pal/Secam...
  • Page 58 first trigger. Single When you want the oscilloscope to acquire a single waveform, press the “SINGLE” button. Set up Enter the “Trigger setup menu”. Page 2/2 Return to the first page of “Video Next Page Trigger menu”. Figure 33 - Video Trigger Menu 2 Operating Instructions: Set up Type Press the “TRIG MENU”...
  • Page 59 Press the “Standard” option button to select “PAL/SECAM” or “NTSC”. Slope Trigger Trigger on positive slope or negative slope according to setup time of the oscilloscope. Table 20 - Slope Trigger Function Menu 1 Option Setting Description Type Slope Trigger on positive slope or negative slope according to setup time of the oscilloscope.
  • Page 60 Figure 34 - Slope Trigger Menu Table 21 - Slope Trigger Function Menu 2 Option Setting Description Type Slope Trigger on positive slope or negative slope according to setup time of the oscilloscope. Vertical Select the trigger level that can be adjusted by “LEVEL”...
  • Page 61 free-run in the absence of a valid trigger. This mode allows an untriggered, scanning waveform at 100 ms/div or slower time base setting. Use this mode when you want to see only valid triggered waveforms. When Normal you use this mode, the oscilloscope does not display a waveform until after the first trigger.

  • Page 62: Alternate Trigger

    Press the “TRIG MENU” button to enter “Trigger menu”. Press the “Type” option button to select “Slope”. Press the “Source” option button to select “CH1”, “CH2”, “CH3”, or “CH4”. (CH3 and CH4 available for 4CH models only) Press the “When” option button to select “ ”, “...
  • Page 63 Table 22 - Set Trigger Mode to Edge Trigger Function Menu 1 Option Setting Description Type Alternate The trigger signal comes from two vertical channels when you use alternative trigger. In this mode, you can observe two irrelative signals at the same time. Select any two channels from CH1, CH2, Channels CHX-CHY...
  • Page 64 Table 23 - Set Trigger Mode to Pulse Trigger Function Menu 1 Option Setting Description Type The trigger signal comes from two vertical channels when you use Alternate alternative trigger. In this mode, you can observe two irrelative signals at the same time. Channels CHX-CHY Select any two channels from CH1,...
  • Page 65 Table 25 - Set Trigger Mode to Video Trigger Function Menu 1 Option Setting Description Type Alternate The trigger signal comes from two vertical channels when you use alternatee trigger. In this mode, you can observe two unrelated signals at the same time.
  • Page 66 Standard NTSC Select the video standard for sync and Pal/Secam line number count. Set up Enter the “Trigger Setup Menu” Enter the second page of Alternatetrigger Next Page Page 2/2 menu. Table 27 - Set Trigger Mode to Slope Trigger Function Menu 1 Option Setting Description...

  • Page 67: Operation Instructions

    Vertical Select the trigger level that can be adjusted by “LEVEL” knob. You can adjust “LEVEL A”, “LEVEL B” or adjust them at the same time. Selections depend on slope trigger condition. Set up Enter the “Trigger setup menu”. Next Page Page 2/2 Return to the first page of “Alternate trigger menu”.

  • Page 68: Coupling

    Coupling Use “Coupling” to make sure the signal passes through the trigger circuit. It is useful for obtaining a steady waveform. If you use trigger coupling, you should press the “TRIGGER” button and then select “Edge”, “Pulse”, “Video”, or “Slope” trigger. Then select the “coupling”...

  • Page 69: Trigger Holdoff

    Note: ● Press the SINGLE button when you want the oscilloscope to acquire a single waveform. ● Trigger coupling affects only the signal passed to the trigger system. It does not affect the bandwidth or coupling of the signal displayed on the screen. ●...

  • Page 70: Signal Acquisition System

    “Trigger setup menu”. Press the “Holdoff” option button and turn the “Universal” knob to change the holdoff time until the waveform triggers steadily. Note ： ● Use trigger holdoff to help stabilize the display of a periodic waveform. Signal Acquisition System Shown below is the “ACQUIRE”...
  • Page 71 Sa Rate Displays system sampling rate. When you acquire a signal, the oscilloscope converts it into digital form and displays a waveform. The acquisition mode defines how the signal is digitized and the time base setting affects the time span and level of detail in the acquisition.
  • Page 72 Figure 40 - Peak Detect Average: The oscilloscope acquires several waveforms, averages • them, and displays the resulting waveform. Advantage: You can use this mode to reduce random noise. Figure 41 - Acquisition Averaging Screen Equivalent Time Sampling: The equivalent time sampling mode •...
  • Page 73 “RUN/STOP” Button: Press the RUN/STOP button when you • want the oscilloscope to acquire waveforms continuously. Press the button again to stop the acquisition. “SINGLE” Button: Press the SINGLE button to acquire a single • waveform. Each time you push the SINGLE button, the oscilloscope begins to acquire another waveform.
  • Page 74 Operating Instructions: Set up Sampling Format You can press the “Acquisition” option button or turn the “Universal” knob to select “Sampling” mode, “Peak Detect” mode or “Average” mode. Set up Averages When you select “Average” format, you can press the “Averages” option button to select “4”, “16”, “32”, “64”, “128”...

  • Page 75: Display System

    Set up Sampling mode Press the “Mode” option button to select “Real Time” or “Equ Time”. Set up Sampling rate Adjust the sampling rate by pressing the “Sa Rate” option button and turning the Time/div front panel knob. The sampling rate is shown at the corresponding timebase scale.
  • Page 76 Figure 45 - Display Menu Screen Table 31 - Display System Function Menu 2 Option Setting Description Format YT format displays the vertical voltage in relation to time (horizontal scale). XY format displays a dot each time a sample is acquired on channel 1 and channel Screen Normal...
  • Page 77 20sec Infinite Next Page 2/3 Press this button to enter the second Page page of “Display menu”. Figure 46 - Display Menu 2 Table 32 - Display System Function Menu 3 Option Setting Description Skin Classical Set up screen style. Modern Tradition Succinct...
  • Page 78 Operation Introduction: Setup waveform display type Press the “DISPLAY” button to enter the “Display” menu. Press the “Type” option button to select “Vectors” or “Dots”. Set up Persist Press the “Persist” option button to select “Off”, “1 Sec”, “2 Sec”, “5 Sec” or “Infinite”. You can use this option to observe some special waveforms.

  • Page 79: X-Y Format

    Setup Grid Press the “Grid” option button to select “ ”, “ ”or“ ”to set the screen whether to display grid or not. Setup Menu Display Press the “Menu Display” option button to select “2 sec”, “5 sec”, “10 sec”, “20 sec”, or “Infinite” to set menu display time on screen.

  • Page 80: Measure System

    ● Auto (resets display format to YT) ● Trigger Control ● Horizontal Position Knob ● Vector Display Type ● Scan Display Note: When the display type is set to Vector, the oscilloscope connects the sample points by using digital interpolation. Interpolation mode contains linear interpolation and sin(x)/x interpolation.

  • Page 81: Cursor Measurement

    Cursor Measurement The cursor measurement has three modes: Manual, Track, and Auto Measure. Manual Mode Table 33 - Manual Cursor Function Menu Option Setting Description Cursor Manual Manually adjust cursors for Mode measurement. Type Voltage Use cursor to measure voltage Time parameters.
  • Page 82 Voltage Cursor: Voltage cursors appear as horizontal lines on • the display and measure the vertical parameters. Time Cursor: Time cursors appear as vertical lines on the • display and measure the horizontal parameters. Cursor Moving: Use the “Universal” knob to move cursor 1 and •...

  • Page 83: Track Mode

    Figure 48 - Cursor Menu Track Mode Table 34- Track Mode Function Menu Option Setting Description Cursor Mode Track In this mode, set track cursor measure. Cursor A Set the input signal channel that the Cursor A will measure. *CH3 *CH4 NONE Cursor B...
  • Page 84 horizontal position on the waveform by turning the “Universal” knob. The oscilloscope displays the values on the top left of the screen. To do track cursor measurement, follow these steps: Press CURSOR button to enter the cursor measure function menu. Press the “Cursor Mode”...

  • Page 85: Auto Mode

    Figure 49 - Cursor Menu Auto Mode Table 35 - Auto Mode Function Menu Option Setting Description Cursor Auto Set to auto cursor Mode measure mode. This mode will take effect with automatic measurements. The instruments will display cursors while measuring parameters automatically. To do auto cursor measurements, follow these steps: Press the CURSOR button to enter “Cursor measure menu”.

  • Page 86: Auto Measurement

    Figure 50 - Auto Mode Auto Measurement When you take automatic measurements, the oscilloscope does all the calculation for you. The measurements use all the recorded points in the memory, which are more accurate than measurements made using the graticule lines or cursor measurements because these measurements are confined to be made by only using points on the display and not all the data points recorded by the oscilloscope.
  • Page 87 Figure 51 - Auto Measure Menu 1 Table 37 - Auto Measurement Function 2 - Voltage Measurement Menu Option Setting Description Source CH1, CH2, *CH3, *CH4 Select input signal source for Voltage measurement. Type Vpp, Vmax, Vmin, Vamp, Press the “Type” button Vtop, Vbase, Vavg, Mean, or turn the “Universal”...
  • Page 88 Table 38 - Auto Measurement Function 3 - Time Measurement Menu Option Setting Description Source CH1, CH2, *CH3, Select input signal *CH4 source for Time measurement. Type Press the “Type” Freq, Period, +Width, - button or turn the Width, Rise Time, Fall “Universal”...
  • Page 89 Return Return to the first page of auto measurement menu. *Available for 4CH models only. Table 40 - All Measurement Function Menu Option Setting Description Source Select input signal channel. *CH3 *CH4 Voltage Turn on the all measurement function to measure voltage parameters.
  • Page 90 Measures the highest voltage over the entire waveform. Vtop Measures the lowest voltage over the entire waveform. Vbase The arithmetic mean over the first cycle in the waveform. Vavg The arithmetic mean over the entire waveform. Mean The true Root Mean Square voltage over the first cycle in the waveform.
  • Page 91 -Width Measures the time between the first falling edge and the next rising edge at the - Wid waveform 50% level. Measures the first cycle waveform. Positive Duty Cycle is the ratio between + Duty positive pulse width and period. Measures the first cycle waveform.
  • Page 92 Press the first option button to enter the “second measurement menu”. Select measure type. If you press the “Voltage” option button, “Voltage measurement” menu will display on the screen. Press the “Source” option button to select “CH1”, “CH2”, “CH3”, or “CH4” according to input signal channel. (CH3 and CH4 available for 4CH models only) Press the “Type”...

  • Page 93: Storage System

    Figure 52 - Measuring Time Parameters Storage System Shown below, the “SAVE/RECALL” button enters the “Storage System Function Menu”. The scope can save and recall up to 20 instrument settings and 20 waveforms to its internal memory. There is a USB host port on the front and rear panel of the oscilloscope where you can save setup data, waveform data, waveform interface image, and CSV file to a USB flash drive.

  • Page 94: Recalling Files

    Figure 53 - Save All Menu Screen 1 Figure 54 - Save All Menu Screen 2 Recalling Files The Load button is used to recall your setup files. Once you have navigated to the desired file and it is highlighted in the main screen area, press the Load option button and the setup is recalled from the USB flash drive.
  • Page 95 Both Directory and Files have Rename and Return option buttons on Page2/2. Use these buttons to give an existing folder or file a new name or to exit the SAVE/RECALL screen, respectively. Figure 55 - Rename Screen Creating Folders and Files Create new folders and files by pressing the New Folder or New File option button.
  • Page 96 The New File menu options are the same as the New Folder • menu. The InputChar option button adds the selected character to the cursor position in Name field. • Move the cursor position in the name field using the “→” and “←”...
  • Page 97 Figure 57 - Save/Rec Menu To save setups to the oscilloscope’s internal memory, follow the steps below: For example: Save setup that set waveform display type to “Dots” to internal memory. Press the “SAVE/RECALL” button to enter the “SAVE/RECALL” menu. Press the “Type”...
  • Page 98 Save Setup to USB Flash Drive • Table 43 - Save Setup to USB Flash Drive Function Menu Option Setting Description Type Setups Menu for the Storage/Recall settings. Save to File Save setup data to USB flash drive. Save Go to the Save/Recall interface Figure 58 - Save Setup Screen Save Setup to USB Flash drive: For example: Save setup that set waveform display type to “Dots”...
  • Page 99 Press the “New folder” button to create a new folder Press the “Del folder” option button to delete a folder Press the “Modify” option button to modify a folder. Press the “New file” option button to create a new file Press the “Del file”...
  • Page 100 Figure 59 - Set Factory Default Screen Save/Recall Waveform Save Waveforms to Device Table 45 - Save Waveform to Device Function Menu Option Setup Description Type Waveforms Selects Waveform for saving/recalling. Save to Device Save waveforms to the oscilloscope’s internal memory. Waveform No.1 to No.20 Press the “Waveform”...
  • Page 101 Figure 60 - Save Waveform Menu Screen To save waveforms in internal memory, follow the steps below: Input a sine signal to channel 1 and press the “Auto” button. Press the “SAVE/RECALL” button to enter “SAVE/RECALL” display menu. Press the “Type” option button to select “Waveforms”. Press the “Save to”...
  • Page 102 Save Waveforms to USB Flash Drive Table 46 - Save Waveforms to USB Flash Drive Function Menu Option Setup Description Type Waveforms Menu for the Storage/Recall waveforms. Save to File Select save location to USB flash drive. Save Select to save to USB. Figure 61 - Save Waveforms Screen To save waveforms to a USB flash drive, follow the steps below: Input a sine signal to channel 1, press the “AUTO”...
  • Page 103 there will be a message “Save data success” displayed on the screen). Now the waveform data have been saved to the USB flash drive. Recall waveforms from USB flash drive, follow next steps: Press the “SAVE/RECALL” button. Press the “Type” button to select “Waveforms”. Insert a USB flash drive to the front or rear USB host port of the oscilloscope and wait until the oscilloscope has initialized USB flash drive (within ten seconds).
  • Page 104 Figure 62 - Save Picture Screen To save waveform images to USB flash drive, follow the steps below: Select the screen image that you want. Press the “SAVE/RECALL” button to enter “SAVE/RECALL” menu. Press the “Type” option button to select “Picture”. Insert a USB flash drive to the front or rear USB host port of the oscilloscope and wait until the oscilloscope has initialized the USB flash drive (about five seconds).
  • Page 105 .CSV file. Data Depth Displayed Set to store displayed waveform data to .CSV file. Maximum Set to store maximum waveform data to .CSV file. Para Save Set whether to include waveform parameters in the .CSV file or not. Save Go to the SAVE ALL menu. Figure 63 - Save to CSV Screen To save CSV files to USB flash drive, follow the steps below: Press the “SAVE/RECALL”...
  • Page 106 Note: The maximum number of data points of a waveform that can be saved as a .CSV file into USB drive is ~24576 pts (depending on the timebase setting) when data depth is set to maximum. The actual number depends on the time base setting, the channels that are active, and whether data depth is set to “display”...

  • Page 107: Utility System

    Utility System Press the UTILITY button from the front panel to access utility options. Table 49 - Utility System Function Menu 1 Option Setting Description System Displays summaries of the Status oscilloscope settings. Sound Open the key-press voice. Close the key-press voice. Counter Turn on Frequency Counter Turn off Frequency Counter.
  • Page 108 Figure 64 - Utility Menu Screen 1 Table 50 - Utility System Function Menu 2 Option Setting Description Do Self Cal Auto self calibration. Do Self Test Screen Test Run the screen test program Keyboard Test Run the keyboard test program LED Test Run the LED test program.
  • Page 109 Figure 65 - Utility Menu Screen 2 Table 51 - Utility System Function Menu 3 Option Setting Description Update Update the firmware of the oscilloscope firmware using a USB flash Drive. Pass/Fail Pres this button to enter the “Pass/Fail menu”. Record Press this button to enter the waveform record menu.
  • Page 110 Recorder Record Goes into the “recorder” menu to start waveform record. Replay Playback recordings Option Recording options Date/Time Sets the date and time on the instrument. Quick-Cal Enable or disable quick calibration. Return Returns to previous menu Option Setting Description Set the current display year using the Year 2000-2099...

  • Page 111: System Status

    System Status Press the “System Status” option button of the Utility Menu to view the oscilloscope’s hardware and software configuration. Figure 66 - System Status Info Screen Table 53 - System Status Information Option Description Startup Times Lists the number of startup times. Software Version Lists the software version.

  • Page 112: Self Calibration

    Figure 67 - Language Selection Screen Self Calibration Self Calibration procedure can optimize the signal path for optimal measurement results. You can run this procedure at any time. If the operating temperature changes by more than 5° C or the instrument runs more than thirty minutes, running self calibration is recommended.

  • Page 113: Self Test

    Figure 68 - Calibration Screen Self Test Press “UTILITY” and select “Do Self Test” Table 54 - Self Test Menu Option Description Screen Test Run Screen Test Program. Keyboard Test Run Keyboard Test Program. LED Test Run LED Test Program. Screen Test Select “Screen Test”...
  • Page 114 Figure 69- Screen Test Start Screen Keyboard Test Select “Keyboard Test” to enter the key test interface. The on-screen shapes represent the front panel keys. The shapes with two arrows beside them represent the front panel knobs. The squares represent the knob presses for scale knobs.
  • Page 115 Figure 70 - Key Test Screen LED Test Select “LED Test” to test the LED backlights on some of the front panel buttons. The screen will display key shapes that represent all the buttons of the front panel. Follow the instruction prompt below and “Press ‘SINGLE’ Key to continue , Press ‘RUN/STOP’...

  • Page 116: Updating Firmware

    Figure 71 - LED Test Screen Updating Firmware Using USB flash drive to update firmware • The firmware of the oscilloscope can be updated directly via a USB Flash drive. This process takes about two minutes. To update, follow the steps below: Download and save the firmware file onto a USB flash drive.

  • Page 117: Pass/Fail

    WARNING: Do NOT turn off the power while the oscilloscope is updating. Otherwise, the firmware will be corrupted, and the instrument may not be able to reboot again. Pass/Fail The Pass/Fail function can monitor changes of signals and output pass or fail signals by monitoring the input signal and checking if it is within the predefined mask or not.
  • Page 118 Figure 72 - Pass/Fail Screen 1 Table 56 - Pass/Fail Function Menu 2 Option Setting Description Output Pass Output signal when pass Fail condition is detected. Output signal when fail condition is detected. Stop On Output When On, it stops the test when an output occurs.
  • Page 119 Figure 73 - Pass/Fail Screen 2 Table 57 - Mask Setting Function Menu 1 Option Setting Description X Mask Turn the “Universal” knob to set the range of horizontal clearance to the waveform. <0.04div- xdiv 4.00div> Y Mask Turn the “Universal” knob to set the range of vertical clearance to the waveform.
  • Page 120 Figure 74 - Mask Menu Screen 1 Table 58 - Mask Setting Function Menu 2 Option Setting Description Save Store created mask setting. Load Recall stored mask setting. Return Return to the main menu of mask setting. Last Page 2/2 Return to the first page of the Page “Mask Setting menu”.

  • Page 121: Waveform Recorder

    RUN Pass/Fail test, please follow the steps below: Press UTILITY button to enter the “Utility menu”. Press the “Next Page Page1/4” option button. Press the “Next Page Page2/4” option button to enter the third page of “Utility menu”. Press the “Pass/Fail” option button to enter the “Pass/Fail” function menu.
  • Page 122 Mode Record Set Record function menu. Play Back Set Play Back function menu. Storage Set Storage function menu. Turn off waveform recorder menu. Source Select record source channel. *CH3 *CH4 P/F-OUT Interval Set time interval between record frames. Set max number of record Frame frames.
  • Page 123 To record waveforms, follow these steps: 1. Press the UTILITY button to enter “Utility menu”. 2. Press the “Next Page” option button to enter the third page of “Utility menu”. 3. Press the “Record” button to enter “Waveform Record Menu”. 4.
  • Page 124 Figure 77 - Record Menu Screen 2 Table 61 - Waveform Playback Function Menu 2 Option Setting Description Start Frame Set start frame. Curr_Frame Select current frame to be played. End Frame Set End frame. Return Press to return to the waveform recorder main menu.
  • Page 125 Figure 78 - Record Menu Screen 3 To play back current record waveforms, follow these steps: Press UTILITY button to enter “Utility menu”. Press the “Mode” option button to select “Play Back”. Press the “Play Mode” option button to select “ ”...

  • Page 126: Record

    Record This mode allows for gap-free recording of waveform data and can be enabled in SCAN MODE only (refer to “Horizontal Control Knob section”). It is similar to the above described waveform recorder mode, however the recorded data can only be played back on-screen, but cannot be retrieved.
  • Page 127 used to store the recording. Store Mode Memory Stores recording to internal USB key memory. Stores recording to external USB flash drive. Return Return to the Recording Menu. Option Description Continue/Pause Continue/Pause when playing back a waveform recording. Restart Restart the playback of the recorded waveform. Previous Recall the waveform recording.
  • Page 128 Split Display split screen of the waveform recording and channel recalling, CH1 is displayed in the upper half- screen, and CH2 is displayed in the lower half-screen. For 4CH models, CH1 and CH2 are displayed in the upper half- screen, and CH3 and CH4 are displayed in the lower half- screen.

  • Page 129: Help Menu

    Recorder Operation step： Press the UTILITY button to enter “Utility” menu. Press the “Next Page” option button to enter the fourth page of “Utility” menu. Press the “Recorder” button to enter the Recorder menu. Press the “Option” button to set Recorder options. Press the “Record”...
  • Page 130 Figure 82 - Help Menu Screen...

  • Page 131: Chapter 3 Remote Control

    Chapter 3 Remote Control The 2550 series digital storage oscilloscope comes with Easyscope application software which provides most of the controls that emulate the front panel of the instrument. The rear panel USB device port is used to connect to a computer to allow for remote communication with the software.

  • Page 132: Chapter 4 Application Examples

    Chapter 4 Application Examples This section presents a series of application examples. These simple examples highlight the features of the oscilloscope and give you ideas for using it to solve your own test problems. • Taking simple measurements • Capturing a single-shot signal •...

  • Page 133: Taking Simple Measurements

    Taking Simple Measurements Observe an unknown signal in a circuit, display the signal quickly and measure the frequency and peak-to-peak amplitude. Using Auto set To quickly display a signal, follow these steps: Press the CH1 button, set the Probe option attenuation to 10X and set the switch to 10X on the probe.

  • Page 134: Measuring Ring Frequency

    Press the “Type” option button to select “Vpp”. The corresponding icon and measure value will display on the third option area. Measuring Ring Frequency To measure the ring frequency at the rising edge of a signal, follow these steps: Press the “CURSORS” button to see the “Cursor Menu”. Press the “Mode”...

  • Page 135: Measuring Ring Amplitude

    Measuring Ring Amplitude To measure the amplitude, follow these steps: Press the “CURSORS” button to see the Cursor Menu. Press the “Mode” button to select “Manual”. Press the “Type” option button and select “Voltage”. Press the “Source” option button and select “CH1”. Press the “CurA”...

  • Page 136: Analyzing Signal Details

    The following steps show you how to use the oscilloscope to capture a single event. Set the Probe option attenuation to 10X and set the switch to 10X on the probe. Trigger set up: 1) Press “TRIG MENU” button to show the “Trigger Menu” 2) Under this menu, set the trigger type to “edge”, Edge type is “Rising”, source is “CH1”, trigger mode is “Single”, coupling is “DC”...

  • Page 137: Separating The Signal From Noise

    Separating the Signal from Noise To reduce random noise in the oscilloscope display, follow these steps: 1) Press the “ACQUIRE” button to display the acquire menu. 2) Press the “Acquisition” option button or turn the “Universal” knob to select “Average”. 3) Press the “Averages”...

  • Page 138: Application Of X-Y Function

    Press the “Sync” option button and select “Line Num” and turn the universal knob to set a specific line number. Press the “Standard” option button and select “NTSC”. Turn the “Time/Div” knob to see a complete video line across the screen.

  • Page 139: Analyzing A Differential Communication Signal

    Sin θ=A/B or C/D where θ=phase shift (in degrees) between the two signals from the formula above, you could get: θ=±arcsine (A/B) or ±arcsine (C/D) If the main axis of the ellipse is at II and IV quadrant, θ must be in the range of (0-π/2) or (3π/2-2π).
  • Page 140 Press the “Operation” option button and select “－”. Press the “CH1－CH2” option button to display a new waveform that is the difference between the displayed waveforms. You can adjust the vertical scale and position of the Math waveform. To do so, follow these steps: a.

  • Page 141: Chapter 5 Message Prompts And Troubleshooting

    Chapter 5 Message Prompts and Troubleshooting Message Prompts Trig level at limit! : Prompts you that the trigger Level is at a • limit when you turn the Trig level knob. Horizon position at limit! : Prompts you that the horizontal •...

  • Page 142: Troubleshooting

    Ready Data Success! : Read setup data or waveform data from • the internal memory of the oscilloscope or USB flash was successful. USB Flash Drive isn’t connected! : When the “Save To” option • is set to “File” or the “Print Key” option is set to “Save Picture” in “Save/Recall”...
  • Page 143 “edge” trigger mode. The video signal should use the “Video” Trigger mode. The signal would display steadily only when using matching trigger mode. Attempt to change the “coupling” into “HF Reject” or “LF Reject” display, so that the High/low frequency noise will be filtered.

  • Page 144: Chapter 6 Specifications

    Utility menu, if the operating temperature changes by more than 5° C. The oscilloscope must be within the factory calibration interval. All specifications are guaranteed unless noted “typical.” • Specifications 2552/2553 2554/2555 2556/2557 2558/2559 Inputs Input AC, DC, GND Coupling 1 MΩ...
  • Page 145 Channel 2 mV–100 mV: ±800 mV voltage offset 102 mV – 5 V: ±40 V range Vertical 8 bit Resolution Channels 2 (2552) 2 (2554) 2 (2556) 2 (2558) 4 (2553) 4 (2555) 4 (2557) 4 (2559) Analog 70 MHz...
  • Page 146 <2ns Ch to Ch (Equivalent Skew (both to 2 minor channels in <1ns divisions in same V/div smallest setting) t/div) Math +, -, *, /, FFT operation Window mode: Hanning, Hamming, Blackman, Rectangular Sampling points: 1024 Bandwidth 20 MHz ± 40% (Note: BW limited below 20 MHz when Limited using probe in x1) Common Specifications (all models)
  • Page 147 details on the number of data points that can be saved to a CSV file can be found in the storage chapter of this manual. The number of data points that can be captured via USB device interface using the EasyScope software is specified in the EasyScope manual.
  • Page 148 Slope Trigger (>, <, =) Positive slope, (>, <, =) Negative slope Time: 20 ns - 10 s Alternate CH1 trigger type: Edge, Pulse, Video, Slope Trigger CH2 trigger type: Edge, Pulse, Video, Slope CH3 trigger type: Edge, Pulse, Video, Slope CH4 trigger type: Edge, Pulse, Video, Slope Display System Display Mode...
  • Page 149 Hardware Frequency Counter Reading resolution 6 digits Accuracy ± 0.01% Range DC Couple, 10 Hz to Max. BW Signal Types Satisfying all trigger signals (except pulse width trigger and video trigger) Environmental Temperature Operating: 50° F to 104 °F (10 °C to +40 °C) Not operating: -4 °F to 140 °F (-20 °C to +60 °C)
  • Page 150 Mechanical Dimensions (WxDxH) 14.1 x 6.14 x 4.65 inches (358 x 156 x 118 Weight 4CH models: Approx. 9.9 lbs (4.5 kg) 2CH models: Approx. 9.5lbs (4.3 kg) Interface Front and rear panel USB host port forflash drives USB device port: for PC communication supports SCPI for remote control Specifications are subject to change without notice.

  • Page 151: Certification

    Certification CE Compliant CE Declaration of Conformity The oscilloscope meets the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC Electromagnet Compatibility Directive. Low Voltage Directive EN61010-1: 2001 Safety requirements for electrical equipment for measurement, control, and laboratory use. The oscilloscope meets the following: Installation Categories II (Supply Connector) and I (Measuring Terminals).

  • Page 152: Appendix A Default Setup

    Appendix A Default Setup Menu or system Default setup Options, knobs or buttons CH1,CH2 Coupling BW Limit Volts/div Coarse Probe Invert Filter Volts/div 1.00V MATH Operation SourceA SourceB Invert FFT operation: Source Window Hanning FFT Zoom Scale dBVrms Split Display HORIZONTAL Window Main...
  • Page 153 MEASURE Source Type average ACQUIRE three mode options Sampling Averages Sampling mode Real Time DISPLAY Type Vectors Persist Gird Intensity Brightness Format Menu Display infinite SAVE/RECALL Type Setups Save To Device Setup No.1 REFA/REFB REFA Source REFA REFB UTILITY Sound Counter Back USB Computer...
  • Page 154 LEVEL 0.00V TRIGGER (pulse) Type pulse Source When Set Pulse Width 1.00ms Mode Auto Coupling TRIGGER (Video) Type Video Source Polarity Normal Sync All Lines Standard NTSC Mode Auto Type Slope Source TRIGGER (Slope) Time 1.00ms Mode Auto Type Alternative Source TRIGGER (Alternate)

  • Page 155: Appendix B Index

    Appendix B Index - Width, 92 S/div, 47 + Width, 91 Sampling, 71 Alternative Trigger, 62 Save Picture, 104 Auto set, 25 Screen Test, 114 Blackman, 42 Self Calibration, 113 Counter, 108 Self Test, 114 Coupling, 29 SET TO 50%, 22 Creating Folders and Files, 96 Sinx/x, 71 DEFAULT SETUP, 26...

  • Page 156: Appendix C Disabling Auto Function

    Appendix C Disabling Auto Function The 2550 series has the ability to disable the Auto button that would automatically setup the scope to display a signal, circumventing the need to know how to set up scope parameters. This feature could be used by educators as a teaching tool for basic oscilloscope operation.

  • Page 157: Service Information

    SERVICE INFORMATION Warranty Service: Please go the support and service section on our website www.bkprecision.com to obtain a RMA #. Return the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device.

  • Page 158: Limited Three-Year Warranty

    LIMITED THREE-YEAR WARRANTY B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of three years from date of purchase. B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts.
  • Page 159 22820 Savi Ranch Parkway Yorba Linda, CA 92887 www.bkprecision.com © 2012 B&K Precision Corp. Printed in China V102313...

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