GAOTek 100 MHz USB PC Based Oscilloscope

This USB PC based Oscilloscope operates with a bandwidth of 100 MHz to analyse up to 2 Channels with a maximum sampling rate of 250 MS/s




GAOTek 100 MHz USB PC Based Oscilloscope is an easy to use and high performance product which does not require any external power source. It combines the functions of an oscilloscope, spectrum analyzer, waveform recorder, signal generator, voltmeter and cymometer. It operates up to 250 MS/s real time sampling rate at a bandwidth of 100 MHz. It is suitable for notebook computer, maintenance of electronic equipment and laboratory work in fields such as science, medicine, engineering and telecommunications.

Key Features

  • USB that supports plug n play, with 12 Mbp communication speed
  • No external power required
  • 23 measurement functions
  • Waveforms can be saved in the following formats:text file, jpg/bmp graphic file, MS excel/word file
  • Port/Line, waveform average, persistence and intensity waveform display
  • Adjustable Trigger Levels
  • Auto, normal and single trigger modes available
  • Supports FFT, displays waveform average, persistence, intensity, invert, addition, subtraction, multiplication, division and X-Y plot
  • Compatible with Windows 7, Windows NT, Windows 2000, Windows XP, VISTA Operating systems
  • Labview/VB/VC/ Delphi/ C++ Builder Second Design instance
  • High performance, 250 MS/s real-time sampling rate, 100 MHz bandwidth

Technical Specifications

Bandwidth 100 MHz
Sampling rate 250 MS/s
Channel 2 Channels
Data samples 10 K-512 K/Channel
PC interface USB 2.0 interface
Impedance 1 MΩ 25 pF
Coupling AC/DC/GND
Vertical resolution 8 bit
Gain range 10 mV-5V, 9 Steps
DC accuracy ±3 %
Time base range 4 ns-1h, 38 steps
Vertical adjustable Yes
Input protection diode clamping
Auto set yes (10 Hz to 100 MHz)
Trigger slope +/-
Trigger type rising Edge, falling Edge
Trigger source CH1, CH2,EXT
Pre-Post trigger 0-100%
Buffer size 10 K-512 KB/ Channel
Shot Bandwidth DC to 100 MHz
Network open/ close
Vertical mode CH1, CH2, dual, add
Dimensions 7.4 in x 3.9 in x 1.3 in [190 mm (L) x100 mm (W) x35 mm (H )] mm


S/W CD, Probes, USB cord

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

The  ambient  temperature  and  relative  humidity  should  be  32 °F to -104 °F (0 ℃- to 40 ℃)  and  10 %-80 % respective for the normal operation of the product.

Power Source

The USB terminal and GAOTek device USB are connected via a USB cable for DC +5 V power from the PC. The product does not require an outside power source.

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
  3. Switch to the CD-ROM drive and run ’ Setup.exe’
  4. The GAOTek device USB Installation is started. Click ‘Next’ to continue
  5. Choose a destination directory. Click ‘Next’ to continue
  6. Check the setup information. Click Next to start copying of files. A status dialog box is displayed
  7. Updating your System Configuration
  8. The installation is complete.

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 A0120009tek USB’s USB port.

3.New Hardware is found.

4.New hardware search wizard starts

5.New hardware search wizard starts to search

6.New hardware wizard installs the software

7.Click on ‘Finish’ in the 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

11.New hardware wizard installs software and click on ‘Finish’ in the new hardware search wizard.

Setup GAOTek USB.inf under windows 2000

 When the USB.inf file is not detected automatically, you see a dialog box

  1. In this case you must install the USB.inf file manually
  2. Choose ‘Search for a suitable driver for my device’ button. Click Next to continue
  3. Specify a location. Click Next to continue
  4. The USB.inf file is located USB CD-ROM root directory. Specify the location by either entering or browsing
  5. Then the USB.inf file is detected automatically. Click Next to continue
  6. Click on Finish.

Warning: Be careful not to input excessive power voltage

  • The input power  capacity  is  fixed  as  shown  below  to  prevent  electric  shock  and/or    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.

  • Please eliminate all unused probes or tester leads so that they do not come in contact with surrounding high voltage parts.
  • Make sure that the PC’s power source is grounded.

Handling Precautions

  • 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.

  • Do not connect or disconnect the product with the probe or test lead which is connected to a voltage source.
  • Do not attempt to operate the product at the situation that a risk of dysfunction or shock expected to happen.
  • 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.
  • Keep the product out of the reach of children or those who cannot be trusted with the use.
  • Do not use the product with your hands wet. It can cause an electric shock.
  • Do not try the product for the purposes other than those stated.

Usage Location

  • 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 from humidity, water, or dust.
  • DO NOT  use  this  product  near  gas  as  well  as  other  flammable  and/or explosive materials.
  • Store the product where direct sunlight can’t reach.
  • DO NOT use the product where it’s dirty, other machines are operated, or there is a high level of electromagnetic waves.
  • DO NOT place the product on an unstable cart, stand, or tripod. Such usage creates the dangers of accident and/or damage to product.

Maintenance and Storage

If not using it for a long term, remove the USB cable from the product.

The recommended temperature and humidity for equipment storage is 77 °F (25 ℃) at 50 % humidity.

After Service

  • 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.
  • Do not attempt to open the case or repair yourself. It can cause an electric shock or other safety accidents.
  • Once you  open  the  case,  you  cannot  have  the  privilege  of  an  after-sales service.

Minimum System Requirements

To install and run the USB, you should have the following.

Operating System

Windows 98/ME/2000/XP/VISTA


128 Mbyte

Graphic Card

Microsoft Direct X supported

Screen resolution: 800 x 600

Colour depth: 16 bit

Probe Calibration:

USB Calibration 

  1. When manufactured, the USB is calibrated manually to obtain maximum performance.
  2. You may calibrate the USB 5 or 6 months after purchase.

Probe Compensation

  1. You must use a probe with more than 100 MHz 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, and then push AUTOSET.
  4. Check the shape of the displayed waveform.
  5. Adjust the probe until the displayed waveform is compensated.


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