User’s Guide
DSO-2250 USB
PC Based Digital Oscilloscope
Operation Manual
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
1
Certificate of Product Warranty
This product’s warranty, provided by our company, covers a period of 1 year
form the date of purchase. All faulty parts and/or functions, resulting despite
user’s normal use, will be repaired and/or replaced at no charge during the
warranty period.
However, if any of the malfunctions are caused by user carelessness, inadequate
maintenance, or natural disaster, we will the provide repair and/or replacement
services for a fee regardless of warranty period.
In the event our product does not prove suitable for your application you can
return the product for an exchange or refund. To claim, the product must be
returned in good condition within 14 days. Before returning a product, please
contact and provide us a serial number. The customer is responsible for all
shipping costs.
Products covered by this warranty are limited to those that are registered at the
We headquarter or branch offices and repairs, replacements, or refunds will be
issued according to manufacturer’s discretion. When in need of warranty services,
the purchaser may visit our headquarter or one of our sales offices with the
product or send the product with a detailed description of services required via
postal service to any of our sales offices (the purchaser will be responsible for
packaging, postage, and any postal insurance).Once repair services are completed,
the supplier will return the product to the purchaser (return postage will be paid
by the supplier).
However, if we determined required services to be outside the boundaries of the
warranty coverage, we will first contact the purchaser and provide an estimate of
repair costs and obtain authorization to conduct services before any work is done.
In such a case, return postage along with the repair costs will be billed to the
purchaser when the repaired product is returned.
We do not warrant that the software and the product with which it was supplied
are completely error free or that will function correctly in all operating
environments. It is essential that you, the users, should verify that the software
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
2
and product are functioning to your requirements before relying caused on them
or the data that they generate. We do not accept responsibility for any loss or
injury caused by the use of the product or software. It is the user’s responsibility
to ensure that the product is suitable for the user’s application.
We will not be held legally for any malfunction resulting from user carelessness,
abnormal use, and/or natural disaster. Even if we are in receipt of prior
notification of such dangers, we will not be held legally liable.
Product Warranty Guide
Please read through the ¡°Precautions for Safety¡± carefully to obtain a long and
safe use of this product.
This product has been processed through careful quality control and testing
procedures. Any malfunctions occurring during normal use are covered under the
guidelines of the ¡°Certificate of Product Warranty¡±, which is included in this
Manual.
If you experience product malfunction, please contact our headquarters or any of
our sales offices.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
3
Precautions for Safety
The following instructions are provided for safe and correct use of the product
and to prevent a potentially dangerous situation or damage in advance. Be sure to
read through them before you use the product.
Recommended Usage Environment
l The ambient temperature and relative humidity should be 0-40℃ and
10-80% respective for the normal operation of the product.
Power Source
l The USB terminal and DSO-2250 USB are connected via a USB cable for
DC +5V power from the PC. The product does not require an outside power
source.
Warning: Be careful not to input excessive power voltage
l The product’s input power capacity is fixed as shown below to prevent
electric shock and/or fire. Please DO NOT use voltage higher than that
prescribed below.
(Warning) Be sure to check the probe attenuation before measuring the
voltage. The voltage that is higher than the maximum input voltage can
cause damage to the device and you. In particular, there is the risk of
an electric shock when measuring high voltage. So you need to pay
extra attention not to have your hand touch the terminal.
l Please eliminate all unused probes or tester leads so that they do not come in
contact with surrounding high voltage parts.
l Make sure that the PC’s power source is grounded.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
4
Handing Precautions
l The probe ground lead is at ground potential. Do not connect the ground
lead to an elevated voltage. Connect the ground lead of the probe to earth
ground only.
If measuring the floating potential, we will recommend the measurement by
the differential motion method using CH1 and CH2.
l Do not connect or disconnect the product with the probe or test lead which
is connected to a voltage source.
l Do not attempt to operate the product at the situation that a risk of
dysfunction or shock expected to happen.
l Stop using the product immediately when you notice something unusual
about the smell, smoke or sound.
And then remove the USB connection form your computer.
l Keep the product out of the reach of children or those who cannot be trusted
with the use.
l Do not use the product with your hands wet. It can cause an electric shock.
l Do not try the product for the purposes other than those stated.
Usage Location
l If the products crevice is exposed to electric conductors (solids or liquids),
the product will short circuit and possibly create dangers of electric shock or
fire. Please keep this product away form humidity, water, or dust.
l DO NOT use this product near gas as well as other flammable and/or
explosive materials.
l Store the product where direct sunlight can’t reach.
l DO NOT use the product where it’s dirty, other machines are operated, or
there is a high level of electromagnetic waves.
l DO NOT place the product on an unstable cart, stand, or tripod. Such usage
creates the dangers of accident and/or damage to product.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
5
Maintenance and Storage
l If not using it for a long term, remove the USB cable from the product.
l The recommended temperature and humidity for equipment storage is 25℃
at 50% humidity.
After Service
l There are no parts that you can replace inside the product. Do not attempt
replacing a part yourself. It can give you an electric shock.
l Do not attempt to open the case or repair yourself. It can cause an electric
shock or other safety accidents.
l Once you open the case, you cannot have the privilege of an after-sales
service.
Minimum System Requirements
To install and run DSO-2250 USB, you should have the following.
Operating System
Windows 98/ME/2000/XP/VISTA
Memory
128Mbyte
Graphic Card
Microsoft DirectX supported
Screen resolution: 800x600
Color depth: 16bit
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
6
Hardware Specification
Input
Max. sample rate Real-time sampling: 250MS/s using one channel,
125MS/s using two channels
Channels 2
Bandwidth 100MHz analog bandwidth
Vertical resolution 8 bits/channel
Gain range 10mV ~ 5V/div @ x1 probe(10mV, 20mV, 50mV,
100mV, 200mV, 500mV, 1V, 2V, 5V/div1,2,5
sequence)
100mV ~ 50V/div @ x10 probe
1V ~ 500V/div @ x100 probe
10V ~ 5KV/div @ x1000 probe
Range 8 divisions
Offset level +/-4 divisions
Coupling AC, DC ,GND
Offset increments 0.02 div
Impedance 1M ohm
DC accuracy +/-3%
Input protection 35Vpk (DC + peak AC < 10 kHz, without external
attenuation)
Display Mode Y-T, X-Y
Timebase
Timebase range 4ns/div ~ 1h/div(4ns, 10ns, 20ns, 40ns, 100ns, 200ns,
400ns, 1us, 2us, 4us, 10us, 20us, 40us, 100us, 200us,
400us, 1ms, 2ms, 4ms, 10ms, 20ms, 40ms, 100ms,
200ms, 400ms, 1s,2s, 4s, 10s,20s,40s,10m,20m,40m,1h
/div 1-2-4 sequence)
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
7
Acquisition mode Real-time sampling: 4ns /div ~ 400ms/div
Roll mode: 1s/div ~ 1h/div
Range 10 divisions
Buffer size 10K ~512K samples
Trigger
Mode Auto, Normal and Single
Type Edge trigger: Rising edge, falling edge.
Autoset Yes
Range 10 divisions
Trigger level +/-4 divisions
Settabillity 0.02 div increments
Math
Measurements Vp-p, Vmax, Vmin, Vmean, Vrms, Vamp, Vhigh, Vlow,
positive overshoot, negative overshoot, cycle mean,
cycle rms, period, frequency, positive pulse width,
negative pulse width, rise time (10%~90%), fall time
(10%~90%), positive duty cycle, negative duty cycle
Cursor Time/frequency difference, voltage difference Frequency
only in FFT mode
Math Addition, Subtraction, Multiplication, Division
FFT Rectangular, Hanning, Hamming, Blackman Window
Physical
Interface Universal Serial Bus (USB2.0,1.0)
Power No external power source required.
Bus-powered from USB
Dimensions 187 x100 x 33(mm)
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
8
Introduction
DSO-2250 USB developed by our company. is a portable PC-based
Digital Oscilloscope.
High performance
DSO-2250 USB has the following features: 100MHz analog
bandwidth, 250MHz real-time sampling.
USB connected
DSO-2250 USB uses USB that supports plug’n play, with
12Mbp communication speed.
Best performance for your dollar
DSO-2250 USB has many features that are comparable to the
high speed stand-alone DSOs. But it costs a fraction of the
price.
No external power required
DSO-2250 USB does not need an external power source,
because it is bus-powered from USB
Easy to use
DSO-2250 USB is easy to use. It is intuitive and easy to understand.
Big screen
You can change DSO-2250 USB screen size as you need.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
9
Various data format processing
DSO-2250 USB can save waveform in the following formats: text file, jpg/bmp
graphic file, MS excel/word file.
Software Installation
1. While in Windows, insert the installation CD into the CD-ROM drive.
2. The installation should start up automatically. Otherwise in Windows Explorer,
switch to the CD-ROM drive and run ’ Setup.exe’.
3. The DSO-2250 USB Installation is started. Click 'Next' to continue.
4. Choose a destination directory. Click 'Next' to continue.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
10
5. Check the setup information. Click Next to start copying of files.
6. This Status dialog is displayed during copying of files.
7. Updating Your System Configuration.
8. The installation is complete.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
11
Hardware Setup
1. Connect the A-Type Plug of USB cable to your PC’S USB port.
2. Connect the B-Type Plug of USB cable to DSO-2250 USB’S USB port.
3. New hardware is found.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
12
4. New hardware search wizard starts.
5. New hardware search wizard starts to search
6. New hardware wizard installs software
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
13
7. Finish new hardware search wizard.
8. New hardware is found.
9. Set the driver search location to CD-Rom or the driver path
10. New hardware search wizard starts to search.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
14
11. New hardware wizard installs software and finish new hardware search
wizard.
Setup DSO-2250 USB.inf under windows 2000
When DSO-2250USB.inf file is not detected automatically, you see the
following dialog box.
In this case you must install DSO-2250 USB.inf file manually.
1. Choose 'Search for a suitable driver for my device' button. Click Next to
continue.
2. Specify a location. Click Next to continue.
3. The DSO-2250 USB.inf file is located in DSO-2250 USB CD-ROM root
directory. Specify the location by either entering or browsing.
4. DSO-2250 USB.inf file is detected automatically. Click Next to continue.
5. Click Finish.
ＤＳＯ－２２５０ ＵＳＢ Ｍａｎｕａｌ
15
Probe Calibration
DSO-2250 USB Calibration
1. When manufactured, DSO-2250 USB is calibrated manually to obtain
maximum performance.
2. You may calibrate DSO-2250 USB 5 or 6 months after purchase.
Probe Compensation
1. You must use a probe with more than 100MHz bandwidth to get undistorted
signal.
2. Probe should be compensated whenever it is connected for the first time.
3. Connect calibration signal to channel 1, then push AUTOSET.
4. Check the shape of the displayed waveform.
5. Adjust the probe until the displayed waveform is compensated.
Loading...