B+K precision 2530 User manual

Model 2530 Digital Storage Oscilloscope
25MHz, 250MSa/s
INSTRUCTION
MANUAL
MODEL 2530

2
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.
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

3
Introduction
Description
The 2530 Digital Storage Oscilloscope is a light-weight benchtop oscilloscope for viewing waveforms and
taking measurements. The 2530 is an ideal education and training tool and also well suited for
applications in service and repair.
Key Features
25 MHz bandwidth, 250MSa/s sample rate
4000 point record length for each channel
One touch automatic setup for ease of use (Auto)
Save/Recall setup and waveform data
Capture, save and analyze waveform data and measurement results with the included EasyScope
Application Software
Cursors with readouts
Eleven automatic measurements
Waveform averaging and peak detection
Math functions: +, -, / and × operations
Fast Fourier Transformation (FFT)
Extensive Trigger capabilities: Pulse Width trigger, Video trigger capability with line-selectable
triggering, External trigger
Variable persistence display
Built in trigger frequency counter

4
Table of Content
Chapter 1 Getting Started................................................................6
1.1 Installation................................................................................................................. 6
1.2 Functional check ....................................................................................................... 6
1.3 Probe handling .......................................................................................................... 8
1.3.1 Probe Safety ........................................................................................................... 8
1.3.2 Probe Compensation .............................................................................................. 8
1.3.3 Probe Attenuation Setting ...................................................................................... 9
1.4 Self Calibration ....................................................................................................... 10
Chapter 2 Main Control Sections Overview .............................. 11
2.1 Vertical System ........................................................................................................11
2.2 Horizontal System................................................................................................... 13
2.3 Trigger System ........................................................................................................ 15
2.3.1 Signal Source ....................................................................................................... 16
2.3.2 Trigger Type......................................................................................................... 16
2.3.3 Coupling............................................................................................................... 19
2.3.4 Position ................................................................................................................ 19
2.3.5 Slope & Level ...................................................................................................... 19
2.4 Acquisition system .................................................................................................. 20
2.5 Display System ....................................................................................................... 23
2.5.1 X-Y Format .......................................................................................................... 25
2.6 Measurement system............................................................................................... 25
2.6.1 Graticule Measurement ........................................................................................ 26
2.6.2 Cursor Measurement ............................................................................................ 26
2.6.3 Auto Measurement ............................................................................................... 27
2.7 Utility System ......................................................................................................... 30
2.7.1 System status........................................................................................................ 31
2.7.3 Self Calibration .................................................................................................... 31
2.7.4 Self Test................................................................................................................ 31
2.8 Save/Recall System................................................................................................. 32
Chapter 3 Operating Basics........................................................36
3.1 Display Area............................................................................................................ 35
3.2 Using the Menu System .......................................................................................... 36
3.3 Using the default setup............................................................................................ 37
3.4 Using the auto setup................................................................................................ 37
3.5 Using the ADJUST knob......................................................................................... 39
3.6 Setting up the Vertical System ................................................................................ 40
3.6.1 Setting up the CH1、CH2 Channels.................................................................... 40
3.6.2 Using the Vertical Position knob and Volts/Div knob.......................................... 44
3.6.3 Using Ref ............................................................................................................. 44
3.7 Math Functions ....................................................................................................... 45

5
3.8 Setting up the Horizontal system ............................................................................ 49
3.8.1 Horizontal control knobs...................................................................................... 49
3.8.2 Window Zone....................................................................................................... 49
3.8.3 Trigger holdoff ..................................................................................................... 50
3.9 Set trigger system.................................................................................................... 50
3.10 Menu and control button ....................................................................................... 51
3.11 Connectors ............................................................................................................ 51
Chapter 4 Application Examples...................................................53
4.1Taking Simple Measurements .................................................................................. 53
4.2 Taking Cursor Measurements ................................................................................. 54
4.2.2 Measuring Ring Amplitude.................................................................................. 55
4.3 Capturing a Single-Shot signal ............................................................................... 55
4.4 Analyzing signal details .......................................................................................... 56
4.4.1 Looking at a Noisy Signal.................................................................................... 56
4.4.2 Separating the Signal from the Noise................................................................... 56
4.5 Triggering on a Video Signal .................................................................................. 56
4.5.1 Triggering on a Video Field ................................................................................. 56
4.5.2 Triggering on Video Lines ................................................................................... 57
4.6 Application for the X-Y function ............................................................................ 57
4.7 Analyzing a Differential Communication Signal .................................................... 58
Chapter 5 Prompt messages and troubleshooting hints.................60
Appendix A: Specifications...........................................................62
Appendix B: Default setup............................................................65
Appendix C: Sample Rate versus Timebase Setting .....................66
Appendix D: Daily Maintenance and Cleaning ............. 66
Appendix E: Index ........................................................................68
Appendix F: Service and Warranty Information ...........................69

6
Chapter 1 Getting Started
This Chapter describes the following:
◆Installation
◆Basic functional check
◆Probe check and compensation
◆Setting of probe attenuation factor
◆Self calibration procedure
1.1 Installation
Inspection
Inspect the shipping container and the product for damage. In case of any damage, notify your authorized
B+K Precision distributor. Make sure all the accessories as described in the specification chapter are
included.
Power Source
Connect your instrument to an AC power outlet delivering 100 – 240V, 47 – 440 Hz. Use the power cord
provided or a comparable cord with an Earth ground connector.
Security Loop
The instrument provides a security loop located in the rear panel of the instrument. Use a security cable
or a security lock to secure your instrument to your location.
1.2 Functional check
Perform this check to make sure your instrument is operating correctly.
1. Power On the oscilloscope.
Press the “DEFAULT SETUP” button. Note that the probe default attenuation is 10X.

7
ON OFF
button
/
Figure 1- 2
2. Set the switch to 10X on the included probe and connect it 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. Connect the probe tip and reference lead to the PROBE COMP
connector.
CH1
PROBE COM
P
Figure 1-3
3．Press the “AUTO” button. After a few seconds, you should see a square wave signal with a 1KHz
frequency and about 3V peak-peak amplitude
Figure 1- 4
4 Press the “CH1” button two times to remove the signal from CH1. Repeat steps 2) and 3) for CH2.

8
1.3 Probe handling
1.3.1 Probe Safety
A guard around the probe body provides a finger barrier for protection from electric shock.
Figure 1-5
Connect the probe to the oscilloscope and connect the ground terminal to ground before you take any
measurements.
1.3.2 Probe Compensation
Perform this adjustment to match your probe to the input channel. This should be done whenever you
attach a probe to any input channel for the first time.
WARNING
●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.

9
Figure 1-6
1. Set the Probe option attenuation in the channel menu to 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“AUTOSET”button.
3. Check the shape of the displayed waveform.
Over compensated Correctly Compensated Under compensated
Figure1-7
4. If necessary, use a non-metallic tool to adjust the trimmer capacitor on the probe for to resemble the
Correctly Compensated wave shape as much as possible.
Repeat as necessary.
1.3.3 Probe Attenuation Setting
Probes are available with various attenuation factors which affect the vertical scale of the signal. If you
change the Attenuation switch on the probe, you also need to change the attenuation setting on the
oscilloscope accordingly.
Be sure that the Attenuation switch on the probe matches the Probe option in the oscilloscope. Switch
Note. The default setting for the Probe option is 10X.

10
settings are 1X and 10X.
1.4 Self Calibration
The self calibration routine lets you optimize the oscilloscope’s signal path for maximum measurement
accuracy. You can run the routine at any time but should always run the routine if the ambient temperature
changes by 5℃or more.
To compensate the signal path, disconnect any probes or cables from the front-panel input connectors.
Then, push the UTILITY button, select the “Do Self Cal”option and follow the directions on the screen.
Note. When the Attenuation switch is set to 1X, the probe limits the bandwidth
of the oscilloscope to 6MHz. To use the full bandwidth of the oscilloscope, be
sure to set the switch to 10X.

11
Chapter 2 Main Control sections overview
The front panel is divided into easy-to-use functional areas. This chapter provides you with a quick
overview of the main controls.
Figure 1- 1 Front Panel Controls
To use your oscilloscope effectively, you need to familiarize yourself with the following control sections:
◆Vertical System
◆Horizontal System
◆Trigger System
◆Acquisition System
◆Display System
◆Measurement System
◆Utility Menu
◆Store/Recall Menu
2.1 Vertical System
Each channel has a vertical control menu which appears after pressing the CH1 or CH2 button. The
vertical controls are used to size and position the signals and to turn the waveform on or off. Below is a
figure of the vertical system controls.

12
`
Figure 2-1
Table 2-1 Vertical Control menu
Vertical POSITION knob ：Use the VERTICAL POSITION knobs to move waveforms up or down on
the screen.
Vol ts/Div kn o b ：Use the VOLTS/DIV knobs to control how the oscilloscope amplifies or attenuates the
source signal. When you turn the VOLTS/DIV knob, the oscilloscope increases or decreases the vertical
size of the waveform on the screen with respect to the ground level. Press the“Volt/div” knob to toggle
between “Coarse” and“ Fine” adjustment of the Volt/Div setting.
GND Coupling. Use GND coupling to display a zero-volt waveform. Internally, the channel input is
connected to a zero-volt reference level.
Fine Resolution：The vertical scale readout displays the actual Volts/Div setting while in the fine
resolution setting. Changing the setting to coarse does not change the vertical scale until the VOLTS/DIV
control is adjusted.
Remove the Waveform from the display：Push the CH1 or CH2 button to display the respective vertical
menu. Push CH1 or CH2 button again to remove the waveform.
Menu Settings Explanation
Coupling
DC
AC
GND
Both AC and DC components of the input signal are passed on to the oscilloscope
The DC component is blocked, only the AC component of the input signal is passed
through. Signals below 10Hz are attenuated
The waveform is disconnected from the oscilloscope
Volts/Div Coarse
Fine
Selects the resolution of the Volts/Div knob. Coarse defines a 1-2-5 sequence.
Fine changes the resolution to small steps between the coarse settings
Probe
1X
10X
100X
1000X
Set to match the type of probe you are using to ensure correct vertical readouts
Invert on
off
Waveform inverted
Invert function is off, original waveform is displayed.

13
2.2 Horizontal System
The horizontal controls change the horizontal scale and position of waveforms. The horizontal center of
the screen is the time reference for waveforms. Changing the horizontal scale causes the waveform to
expand or contract around the screen center. The horizontal position knob changes the position of the
trigger point relative to the center of the screen. Below is a figure of the front panel horizontal systems
controls.
Figure 2- 2
Table 2- 2 Horizontal Control Menu：
Menu Explanation
Main Display the waveform
Win Zone Define a window (zoom window) by adjusting the cursor position using the
Horizontal control knobs
Window Expand the waveform defined in Win Zone to full screen width
Holdoff Using the Adjust knob to adjust the holdoff time
Holdoff Reset Reset the holdoff time to 100ns
The center axis of the vertical scale is GND level. The readout on the top right corner，shows the
horizontal position. “M” stands for main time base，“W” stands for window time base (Zoom function,
horizontal menu)。The arrow on the top center scale shows the vertical position.
Note：
●If DC coupling is active，you can quickly measure the DC component of the signal by
simply noting its distance from the ground symbol.
●If the channel is set to AC coupling，the DC component of the signal is blocked allowing
you to use greater sensitivity to display the AC component of the signal.

14
Figure 2-3
Horizontal POSITION Knob：Used to control the position of the trigger relative to the center of the
screen. When the trigger point (downward arrow) moves outside the acquired waveform, (reaches the left
or right edge of the screen) the instrument switches automatically to delayed sweep, indicated by the arrow
pointing left or right instead of downwards. In delayed sweep mode, you can use the horizontal Time/Div
knob to acquire more detail around the center of the screen.
Time/Div Knob：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), the SEC/DIV control
expands or compresses the waveform；Pressing the Time/Div knob resets the horizontal position to
zero.
Window Zone: Define the zoom area of a waveform section. The Window time base setting cannot
be set to a value slower than the main time base setting.
Window：Press to expand the zoom area to cover the whole screen.
Holdoff：You can use Holdoff to produce a stable display of complex waveforms. During the
holdoff time the oscilloscope will not trigger until the holdoff time has expired. For a pulse train,
you can adjust the holdoff time so the oscilloscope triggers only on the first pulse in the train.
Holdoff time
Trigger position
Trigger level
Figure 2-4

15
2.3 Trigger System
The trigger determines when the oscilloscope starts to acquire data and display a waveform. The
oscilloscope acquires data while waiting for the trigger condition to occur. After it detects a trigger, the
oscilloscope continues to acquire enough data so that it can draw the waveform on the display. Below are
the trigger section controls:
Figure2-5
“TRIG MENU”Button：press the “TRIG MENU”Button to display the TRIG MENU
Figure 2-6
Note：
•When you change between the Main, Window Zone, and Window views,
the oscilloscope erases any waveform which was saved on the screen
using persistence.
•Use holdoff to help stabilize the display of aperiodic waveforms.

16
LEVEL Knob：Set the trigger level
SET TO 50％Button：Use the SET TO 50% button to stabilize a waveform quickly. The
oscilloscope automatically sets the Trigger Level about halfway between the minimum and maximum
voltage levels. This is useful when you connect a signal to the EXT TRIG BNC and set the trigger
source to Ext or Ext/5.
FORCE Button：Use the FORCE TRIG button to complete the current waveform acquisition
regardless of whether or not the oscilloscope detects a trigger. This is useful for SINGLE acquisitions
and Normal trigger mode.
2.3.1 Signal Source
You can use the Trigger Source options to select the signal that the oscilloscope uses as a trigger. The
source can be any signal connected to the CH1 or CH2 connectors, the EXT TRIG connector or the AC
power line (available only with Edge trigger).
2.3.2 Trigger Type
The 2530 supports three types of Trigger signals：Edge，Video and Pulse Trigger. Edge trigger can be used
with analog and digital circuits. An edge trigger occurs when the trigger input passes through a specified
voltage level with the specified slope. Pulse trigger is used to find pulses with certain pulse widths. Video
is used to trigger on fields or lines for standard video waveforms.

17
Table 2-3 Edge Trigger Menu ：
Menu Setting Explanation
Type Edge
With Edge selected, the rising or falling edge of the input signal is
used for the trigger
CH1
CH2
Triggers on CH1 or CH2 regardless of whether or not the waveform
is displayed。
EXT Uses the signal connected to the EXT TRIG front-panel BNC as
trigger source. Trigger level range is -2.4V to +2.4V
EXT/5 Same as EXT but attenuates the applied trigger signal by a factor of
five. The trigger level range is extended to +12V to -12V.
Source
AC Line Uses power line as the trigger source. Trigger coupling is set to DC
and the trigger level is 0 volts.
Slope Rising
Falling
Trigger to the rising or falling edge
Auto
Use the Auto Mode to let acquisition free-run in the absence of a
valid trigger condition.. This mode also supports an untriggered,
scanning waveform at 100 ms/div or slower time base settings
Normal
Use this mode when you want to see only valid triggered
waveforms. When you use this mode, the oscilloscope does not
display a waveform until after the first trigger
Mode
Single When you want the oscilloscope to acquire a single waveform,
press the “SINGLE ”button
DC Passes all components of the signal
AC Blocks DC components and attenuates signals below 10 Hz
HF Reject Attenuates the high-frequency components above 80 kHz
Coupling
LF Reject Blocks the DC component and attenuates the low-frequency
components below 300 kHz

18
Table 2-4 Video Trigger Menu：
Table 2-5 Pulse Trigger Menu：
A pulse trigger occurs when a pulse is found in a waveform that matches the pulse definition. The When
and Set Width menu buttons control the pulse definition.
Menu Setting Explanation
Type Video When you select Video Trigger mode, set coupling to AC. Now
you can trigger from a NTSC or PAL/SECAM video signal.
CH1
CH2
Select the input source to be the trigger signal.Source
EXT
EXT/5
Ext and Ext/5 use the signal applied to the EXT TRIG connector as the
source.
(Normal)Triggers on the negative edge of the sync pulse
Polarity
(Inverted) Triggers on the positive edge of the sync pulse
Sync Line Num
All lines
Odd field
Even Field
Select on which part of the video signal you want to trigger
Standard NTSC
Pal/Secam
Select the video standard for sync and line number count
Menu Setting Explanation
Type Pulse Select the pulse to trigger the
pulse match the trigger condition
Source
CH1
CH2
EXT
EXT/5
When
(Positive pulse width less than pulse width setting)
(Positive pulse width larger than pulse width setting)
(Positive pulse width equal to pulse width setting)
(Negative pulse width less than pulse width setting)
(Negative pulse width larger than pulse width setting)
Select how to compare the trigger
pulse relative to the value
selected in the Pulse Width
option

19
Hint：Use Pulse Width triggering to trigger on aberrant pulses.
2.3.3 Coupling
Use “Coupling” to select which component of the signal to pass on to the trigger circuit. This parameter
only applies to Edge or Pulse trigger mode, for Video trigger mode coupling is always set to AC.
2.3.4 Position
The horizontal position control establishes the time between the trigger position and the screen center. You
can adjust the HORIZONTAL POSITION control to view waveform data before the occurrence of the
trigger, after the trigger, or any point in between. When you change the horizontal position of a waveform,
you are changing the time between the trigger and the actual center of the display. (This appears to move
the waveform to the right or left on the display.). Use a pretrigger setting to acquire waveforms leading up
to a trigger event. Use a post trigger setting when you want to acquire waveforms that follow an event.
When the trigger point (downward arrow) moves outside the acquired waveform, (reaches the left or right
edge of the screen) the instrument switches automatically to delayed sweep, indicated by the arrow
pointing left or right instead of downwards. In delayed sweep mode, you can use the horizontal time/Div
knob to acquire more detail around the center of the screen.
2.3.5 Slope & Level
The Slope and Level controls help to define the trigger. The Slope option (Edge trigger type only)
determines whether the oscilloscope finds the trigger point on the rising or the falling edge of a signal. The
TRIGGER LEVEL knob controls where on the edge the trigger point occurs.
(Negative pulse width equal to pulse width setting)
set width 20.0ns～10.0s Adjust the pulse width with the
ADJUST knob
Mode
Auto
Normal
single
Select the type of triggering;
Normal mode is best for most
Pulse Width trigger applications
Coupling
DC
AC
HF Reject
LF Reject

20
Falling edge
Rising edge
Triggerlevelcanbeadjustedvertically
Figure 2-7
2.4 Acquisition system
When you acquire a signal, the oscilloscope digitizes the signal and displays the resulting waveform on the
screen. 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. The sampling rate adjusts automatically to a value suitable for
each selected Time/Div scaling factor. Refer to Appendix C for more detailed information.
Push the ACQUIRE button to access the Acquisition menu
Acquire button
Figure 2-8
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.
•Normal Polarity Sync triggers always occur on negative-going horizontal sync pulses. If the video
waveform has positive-going horizontal sync pulses, use the Inverted Polarity selection.