BK Precision BK Precision 2557 Manual
Model: 2552, 2553, 2554, 2555, 2556,
2557, 2558, 2559
4CH/2CH Digital Storage
Oscilloscopes
USER MANUAL
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
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 instr uctions 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.
This manual contains information and warnings must be followed
to ensure safe operation as well as to maintain the oscilloscope in a
safe condition.
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet
must be connected to an electrical gro und. This instrument is
grounded thr ough the ground conductor of the supplied, threeconductor ac power cable. The power cable must be plugged into
an approved three-conductor electrical outlet. Do not alter the
ground connection. Without the prote ctive ground connection, a ll
accessible conductive parts (including control knobs) can render
an electric shock. The power jack and mating plug of the power
cable meet IEC safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases
or fumes. Operation of any electrical instrument in such an
environment constitutes a definite safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Instrument covers must not be removed by operating personnel.
Component replacement and internal adjustments must be made
by qualified maintenance personnel. Disconnect the power cord
before removing the instrument covers and replacing components.
Under certain conditions, even with the power cable removed,
dangerous voltages may exist. To avoi d injuries, always
disconnect power and discharge circuits before touching them.
DO NOT SERVICE OR ADJUST ALONE
3
Do not attempt any internal service or adjustment unl ess another
Do not alter the ground connection. Without the
protective ground connection, all accessible
conductive parts (including control knobs) can
render an electric shock. The power jack and
mating plug of the power cable meet IEC safety
standards.
To avoid electrical shock hazard, disconnect power
cord before removing covers. Refer servicing to
qualified personnel.
Before connecting the line cord to the AC mains,
check the rear panel AC line voltage indicator.
Applying a line voltage other than the indicated
voltage can destroy the AC line fuses. For
continued fire protection, replace fuses only with
those of the specified voltage and current ratings.
This product uses components which can be
damaged by
static discharge (ESD). To
avoid damage, be sure to follow proper procedures
for handling, storing and transporting parts and
subassemblies which contain ESD-sensitive
components.
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.
WARNINGS AND CAUTIONS
WARNING and CAUTION statements, suc h as the following
examples, denote a hazard and appear throughout this manual.
Follow all instructions containe d in these statements.
A WARNING statement calls atte ntion to an operating procedure,
practice, or condition, which, i f not followed correctly, could
result in injury or death t o personnel.
A CAUTION statement calls attention to an operating procedure,
practice, or condition, which, i f not followed correctly, could
result in damage to or destruction of part or all of the product.
WARNING:
WARNING:
CAUTION:
CAUTION:
electro-
4
Compliance Statements
This product is subject to Directive
Disposal of Old Electrical & Elect r onic Equipment (Applicable in the
European
Union and other European countries with separate collection systems)
2002/96/EC of the European
Parliament and the Council of the
European Union on w aste
electrical and electronic equipment
(WEEE) , and in jurisdicti ons
adopting that Directive, is marked as
being put on the market a fter August
13, 2005, and should not be disposed
of as unsorted
municipal waste. Please utilize your
local WEEE collection
facilities in the disposition of this
product and otherwise observe all
applicable requirements.
Safety Symbols
This symbol is used to denote the measurement ground
connection.
Electrical Shock hazard.
This symbol on an instrument indicates caution. For details,
the user should refer to the operating instructions i n the
manual.
5
On (Power). This is the In position of the power switch
This symbol shows that the switch is a power switch located
CAT I
IEC Measurement Category I.
when instrument is ON.
Off (Power). This is the Out position of the power switch
when instrument is OFF.
at the top of the oscilloscope. Pressing this button toggles the
oscilloscope’s state between operation and power off mode.
(400V)
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.
Inputs may be connected to
mains (up to 400 VAC) und er
Category I overvoltage conditions.
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Table of Contents
SAFETY SUMMARY ...................................................................... 3
CHAPTER 1 INTRODUCTION ....................................................... 10
ANEL AND DISPLAY INFORMATION .................................................... 11
P
Front Panel ........................................................................................ 11
Back Panel ......................................................................................... 12
Display Information .......................................................................... 13
ACKAGE CONTENTS ........................................................................ 15
P
C
HECKING FUNCTIONS ..................................................................... 15
P
ROBE SAFETY ................................................................................ 17
P
ROBE ATTENUATION ...................................................................... 18
P
ROBE COMPENSATION .................................................................... 19
CHAPTER 2 FUNCTIONS AND OPERATING DESCRIPTIONS ........... 20
ENU AND CONTROL BUTTON .......................................................... 21
M
ONNECTORS ................................................................................. 23
C
A
UTO SETUP ................................................................................... 24
D
EFAULT SETUP .............................................................................. 26
U
NIVERSAL KNOB ............................................................................ 27
V
ERTICAL SYSTEM ............................................................................ 28
C
HANNEL FUNCTION MENU .............................................................. 29
Setting Up Channels .......................................................................... 32
SING VERTICAL POSITION KNOB AND VOLTS/DIV KNOB ....................... 36
U
ATH FUNCTIONS ........................................................................... 37
M
FFT Function ...................................................................................... 38
Displaying the FFT Spectrum ............................................................. 40
Select FFT Window ............................................................................ 41
Magnifying the FFT Spectrum .......................................................... 42
Measuring an FFT Spectrum Using Cursors ...................................... 42
SING REF ..................................................................................... 45
U
H
ORIZONTAL SYSTEM ....................................................................... 47
Horizontal Control Knob .................................................................... 47
Window Zone .................................................................................... 48
RIGGER SYSTEM ............................................................................. 49
T
7
Signal Source ..................................................................................... 50
Trigger Type ...................................................................................... 50
Coupling ............................................................................................ 68
Position ............................................................................................. 68
Slope and Level ................................................................................. 68
Trigger Holdoff .................................................................................. 69
IGNAL ACQUISITION SYSTEM ............................................................ 70
S
D
ISPLAY SYSTEM ............................................................................. 75
X-Y Format ........................................................................................ 79
EASURE SYSTEM ........................................................................... 80
M
Scale Measurement .......................................................................... 80
Cursor Measurement ........................................................................ 81
Auto Measurement ........................................................................... 86
TORAGE SYSTEM ............................................................................ 93
S
U
TILITY SYSTEM ............................................................................ 107
System Status .................................................................................. 111
Language ........................................................................................ 111
Self Calibration ................................................................................ 112
Self Test ........................................................................................... 113
Updating Firmware ......................................................................... 116
Pass/Fail .......................................................................................... 117
Waveform Recorder ........................................................................ 121
Record ............................................................................................. 126
ELP MENU ................................................................................. 129
H
CHAPTER 3 REMOTE CONTROL ................................................ 131
CHAPTER 4 APPLICATION EXAMPLES ....................................... 132
AKING SIMPLE MEASUREMENTS ..................................................... 133
T
M
EASURING RING FREQUENCY ........................................................ 134
Measuring Ring Amplitude ............................................................. 135
APTURING A SINGLE EVENT ............................................................ 135
C
A
NALYZING SIGNAL DETAILS ............................................................ 136
Looking at a Noisy Signal ................................................................ 136
Separating the Signal from Noise ................................................... 137
RIGGERING ON A VIDEO SIGNAL ..................................................... 137
T
Triggering on Video Field ................................................................ 137
Triggering on Video Lines ................................................................ 137
8
APPLICATION OF X-Y FUNCTION ....................................................... 138
A
NALYZING A DIFFERENTIAL COMMUNICATION SIGNAL ....................... 139
CHAPTER 5 MESSAGE PROMPTS AND TROUBLESHOOTING....... 141
ESSAGE PROMPTS ...................................................................... 141
M
T
ROUBLESHOOTING ....................................................................... 142
CHAPTER 6 SPECIFICATIONS .................................................... 144
PECIFICATIONS............................................................................. 144
S
C
ERTIFICATION .............................................................................. 151
APPENDIX A DEFAULT SETUP................................................... 152
APPENDIX B INDEX ................................................................. 155
APPENDIX C DISABLING AUTO FUNCTION ................................ 156
SERVICE INFORMATION .......................................................... 157
LIMITED THREE-YEAR WARRANTY ........................................... 158
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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 follo wing:
• Panel and display information
• Package Contents
• Checking functions
• Probe Attenuation
• Probe Compensation
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Panel and Display Information
2
4
5
7
8
9
10
11
12
13
14
3 1 15
16
6
17
16
17
Figure 1 - 4 channel (top) and 2 channel (bottom) front panels
Front Panel
The following contents are a brief intro duction for the front panel function,
which is useful to become familiar with the operation of the DSO.
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1. Power On/ Off button
1
2
3
4
10
7
5
6
8
9
2. USB Host port (for storage to USB flash drives)
3. LCD display
4. 1 kHz probe compensation terminal
5. Menu On/Off button
6. Function keys
7. Print button
8. Universal kno b
9. Cursor, Measure, Acquire, Display, Save/Recall, Utility menu
buttons
10. Help and default setup button
11. Run Contro l s (Single, Run/Stop)
12. Horizontal Controls (Time/div, horizontal position, Horizontal
menu)
13. Auto set button
14. Trigger Controls (Trigger menu, Set to 50%, Force, Trigger level)
15. External trigger BNC
16. 2CH/4CH BNC inputs
17. Vertical Controls (Volts/div, ver tic a l position, CH1 & CH2 or
CH1, CH2, CH3, CH4, On/Off, Math function, Reference
function)
Back Panel
The following shows the back panel connections of the DSO.
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1. Rubber feet
1 2 3
4
6 7 8 9 10
11
12
13
14
15
16
2. Kensington security slot
3. Pass/Fail BNC output
4. LAN interface
5. USB device port (for remote communication)
6. Rear USB host port (for storage to USB flash drives)
7. Main AC power switch
8. Input fuse holder
9. AC line inp ut
10. Carrying hand le
Display Information
Figure 5 - Display Screen
1. Trigger status
• Armed - The oscilloscope is acquiring pre-trigger data.
All triggers are ignored in this state .
• Ready - All pre-trigger data has been acquired and the
oscilloscope is ready to accept a trigger.
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• Trig’d - The oscilloscope has seen a trigger and is
acquiring the post-trigger data.
• Stop - The oscilloscope has stopped acquiring wave fo r m
data.
• Auto - The oscilloscope is in auto mode and is acquiring
wavefor ms in the absence of triggers.
• Scan - The oscilloscope is acquiring and displaying
wavefor m data continuous ly in scan mod e. This mode
occurs when oscilloscope is looking for a signal or when
timebase is set slow enough in which the scope requires
longer time to “scan” in order to acquire the entire signal
on display.
2. Displays position of the present waveform window in internal
memory.
3. Marker shows horizontal trigger position. Turn the
HORIZONTAL POSITION KNOB to adjust the position of the
marker.
4. Print Key – Indicates whether the PRINT KEY option is set to
print picture or save picture.
• “Print Key” option is set to “Save Picture ”
5. Back USB – Indicates whether the BACK USB option is set to
Computer/USBTMC or Printer.
• “Back USB” option is set to “Computer”.
• “Back USB” option is set to “Printer” (not available)
6. Waveform channel number tag.
7. On-screen markers show the ground reference points of the
displayed waveforms. I f t here is no mar ker, the channe l is not
displayed. Display signal source.
8. Signal Coupling Symbol
9. Vertical scale factor of corresponding channels.
10. Indicates whether the bandwidth limiting filter is “On” or “Off”.
The “B” icon indicates the filter is On.
11. Main time base scale setting
12. Horizontal position of main time base waveform.
14
13. Shows the icon for the tri gger type
14. Displays real time and date
15. Shows the trigger volt age
16. Trigger signal frequency
Package Contents
The digital storage oscilloscopes are shipped with the following contents:
• 2550 series Digital Storage Oscilloscope
• User Manual
• USB (Type A to B) communication cable
• AC Power Cord
• Four 10:1 passive oscilloscope probes for 4 channel models, two
probes for 2 channel models
• Certificate of Calibration
Please locate each item from the original packaging and contact B&K
Precision immediately if something is missing.
Checking Functions
Please follow the steps below when checking the oscilloscope’s
functionality.
1. Power on the oscilloscope.
Press “DEFAULT SETUP” to set to factory default settings. The
probe default attenuation is 1X.
15
Figure 6 - Scope Layout
2. 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 t he CH 1 BNC, p ush to connect, and
twist to the right to lock the probe in place. Connect the probe tip
and reference lead to the PROBE COMP connectors.
Figure 7 - Probe Compensation
3. Press “AUTO” to show the 1 kHz frequency and about 3V peak-
peak square wave in couple seconds.
16
Figure 8 - 3Vpp Square Wave
4. 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.
Probe Safety
A guard around the probe body provides a finger barrier for protection from
electric shock.
Figure 9 - Probe
Connect the probe to the oscilloscope and connect the ground terminal to
ground before you take any measurements.
17
Note： To avoid electric shock when using the probe, keep fingers behind
Note. The default setting for the Probe option is 1X.
Note. When the attenuation switch is set to 1X, the probe limits the
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.
Probe Attenuation
Probes are available with various attenuation factors which affec t the
vertical scale of the signal. The Probe Check function verifies that the
Probe attenuati on option matches the attenuation of the probe.
You can push a vertical menu button (such as the CH 1 MENU button), and
select the Probe option that matches the attenuation factor of your probe.
Be sure that the attenuation switch on the probe matches the Probe option
in the oscilloscope. Switch settings are 1X and 10X.
bandwidth of the oscilloscope to 10 MHz (according to Probe spec). To use
the full bandwidth of the oscilloscope, be sure to set the switch to 10X.
18
Probe Compensation
Overcompensated
Compensated Correctly
Undercompensated
As an alternative method to Probe Check, you can manually perform this
adjustment to match your probe to the inp ut channel.
Figure 10 - Probe Compensation Setup
1. Set the Probe option attenuation in the channel menu to 10X. Do
so by pressing CH1 button and selecting “Probe” from menu.
Select 10X. Set the switch to 10X on the probe and connect the
probe to channel 1 on the oscilloscope. If you use the probe hook-
tip, ensure a proper connection by firmly inserting the tip onto the
probe.
2. Attach the probe tip to the PROBE COMP 3V connector and the
reference lead to the PROBE COMP Ground connector. Display
the channel and then push the “AUTO” button.
3. Check the shape of the displayed waveform.
4. If necessary, adjust your probes compensation trimmer pot. Repeat
as necessary.
19
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
• Trigger System
• Acquiring signals System
• Display System
• Measuring waveforms System
• Utility System
• Storage System
• Online Help function
20
Menu and Control Button
Figure 11 - Control Buttons (4CH model shown)
C
hannel buttons (CH1, CH2, CH3, CH4): Press a channel button (CH1,
CH2, CH3, or CH 4) to turn that c hannel 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.
MATH: Press to display the Math menu. You can use the MATH menu to
use the oscilloscope’s Math functions.
REF: Press to display the Ref Wave menu. You can use this menu to save
and recall reference waveforms to and from internal memory.
21
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 Tr igger menu. You can use the Trigger
menu to set the trigger type (Edge, Pulse, Video, Slope, Alternate and
trigger settings.
SET TO 50%: Press to stabilize a waveform quickly. The oscilloscope can
set the trigge r level to be halfway between the minimum and maximum
voltage level automatically. This i s useful when you connect a signal to the
EXT TRIG connector and set the trigger source to Ext or Ext/5.
FORCE: 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.
SAVE/RECALL: Press to d i s play the Save/Recall menu. You can use the
Save/Recall menu to save and recall up to 20 oscilloscope setups and 20
waveforms to/from internal memory or a USB memor y device (limited b y
memory capacity of USB device). You can also use it to recall the default
factory settings, to save waveform data as a comma-delimited file (.CSV),
and to save t he displayed waveform image.
ACQUIRE: Press to display Acquire menu. You can use the Acquire menu
to set the acquisition Sampling Mode (Sampling, Peak Detect, Average).
MEASURE: Press to display a menu of measurement parameters.
CURSORS: Display the Cursor Me nu. Ver tic a l Position controls adjust
cursor position while displaying the Cursor Menu and the cursors are
activated. Cursors remain displayed (unless the “Type” option is set to
“Off”) after leaving the Cursor Menu but are not adjustable.
DISPLAY: Press to open the Display menu. You can use the Display menu
to set grid and waveform display styles, and persistence.
22
UTILITY: Press to open the Utility menu. You can use the Utility menu to
Figure 12 - Connectors
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 settin gs to the default
factory configuration.
HELP: Enter the online help system.
AUTO: Automatically sets the o scilloscope controls to produce a usable
display of the input signals.
RUN/STOP: Continuously acquire s waveforms or stops the acquisition.
Note: If waveform acquisition is stopped (using the
RUN/STOP or SINGLE button), the TIME/DIV contro l
expands or compresses the waveform.
SINGLE: Acquire a single waveform and then stops.
Connectors
Channel Connector (CH1, CH2, CH3, CH4): Input conne ctors for
waveform display.
EXT TRIG: Input connector for an external trigger source. Use the Trigger
Menu to select the “Ext” or “Ext/5” trigger source.
Probe Compensation: 1 kHz voltage probe compensation output and
ground. Use to electrically match the probe to the oscilloscope input
circuit.
23
Note: Do not connect a voltage source to the ground terminal or
it may damage the oscilloscope.
Auto Setup
The 2550 series Digital Sto rage Oscilloscopes have an Auto Setup function
that identifies the wave fo rm types and automatically adjusts controls to
produce a usable display of the input signal.
Press the AUTO front panel button, and t hen press the menu option button
adjacent to the desired waveform as follows:
Figure 13 - Auto Setup
Note: For AUTO set to function properly, the signal frequency must
be > 5 Hz. There will be a short time delay when using AUTO to setup
4 channels.
24
Table 1 - Autoset Menu
Option
Description
Auto set the screen and display
Set the screen and auto display single
Auto set and show the risi ng time.
Auto set and show the falling time.
Causes the oscilloscope to recall the
Function
Setting
Acquire Mode
Adjusted to Sampling
Display Format
Y-T
Display Type
Set to Dots for a video signal, set to Ve c tors
Vertical Coupling
Adjusted to DC or AC according to the
Bandwidth Limit
Off(full)
V/div
Adjusted
(Multi-cycle sine)
(Single-cycle sine)
multi-cycle signal.
cycle signal.
(Rising edge)
(Falling edge)
(Undo Setup)
previous setup.
Auto set determines the trigger source based on the following conditions:
• If multiple channels have signals, the channel with the lowe st
frequency signal.
• No signals found, the lowest-numbered channel displayed when
Auto set wa s invoked
• No signals found and no channels displayed, oscilloscope displays
and uses channel 1.
Table 2 - Autoset Function Menu Items
for an FFT spectrum; otherwise, unchanged
input signal
25
VOLTS/DIV
adjustability
Coarse
Signal inver ted
Off
Horizontal position
Center
TIME/DIV
Adjusted
Trigger type
Edge
Trigger so urce
Auto detect the channel which has the input
Trigger slope
Rising
Trigger mode
Auto
Trigger coupling
DC
Trigger holdoff
Minimum
Trigger le vel
Set to 50%
signal
Note: The AUTO button can be disabled. Please see “Appendix C
Disabling Auto Function” for deta ils.
Default Setup
T
he oscilloscope is set up for normal operation when it is shipped from the
factory. This is the default setup. To recall this setup, press the
DEFAULT SETUP button. For the default options, buttons, and controls,
when you pre s s the DEFAULT SETUP button, refer to “Appendix A
Default Setup”.
The DEFAULT SETUP butto n does not reset the following settings:
• Language option
• Saved reference waveform files
• Saved setup files
• Display contrast
• Calibration data
26
Universal Knob
Figure 14 - Universal Knob
Y
ou can use t he Universal k nob with many functions, such as adjusting
the hold of f t ime, moving cursors, setting t he pulse widt h, setting the
video line, adjusting the upper and lo wer frequency limit and adjusting X
and Y masks when using the pass/fail function. You can also turn the
Universal knob to adjust the storage position of setups, waveforms,
pictures when saving/recalling, and to select menu options. With some
functions, the light indicator ab ove the knob will turn on to indicate that
the knob can be used to make changes or adjustments for that functio n.
The knob can also be pushed to make a selection after
changes/adjustments have been made.
27
Vertical System
Figure 15 - Vertical System Controls
The vertical control could be used for displaying waveform, rectify scale
and position.
28
Channel Function Menu
Option
Setting
Description
Coupling
DC
DC passes both AC and DC components of the
BW Limit
Off
Disables bandwidth limit.
Volts/Div
Coarse
Selects the resolution of the Vo lts/Div knob
Probe
1X
1000X
Set to match the type of probe you are using to
Next Page
Page 1/3
Press this button to enter second page menu.
Option
Setting
Description
Invert
On
Turn on inve rt function.
Input
1M
Set input impedance to 1MΩ.
Table 3 - Channel Function Menu
AC
GND
On
Fine
10X
100X
Table 4 - Channel Function Menu 2
input signal.
AC blocks the DC component of the input
signal and attenuates signals below 10 Hz.
GND disconnects the input signal.
Enables bandwidth limit.
Coarse defines a 1-2-5 sequence.
Fine changes the resolution to small steps
between the coarse settings.
ensure correct vertical readouts.
Off
50Ω
Turn off invert function.
Set input impedance to 50 Ω
29
Filter
Press this button to enter the “Digital Filter
menu”.
Next Page
Page 2/3
Press this button to e nter the third page menu.
Option
Setting
Description
Unit
V A Set the scale unit to voltage.
Skew
0 – 100 ns
Set the skew time between two channels.
Next Page
Page 3/3
Press this button to return the first page menu.
Table 6 - Digital Function Menu
Table 5 - Channel Function Menu 3
Set the scale unit to current.
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