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USB 2.0 Full Speed Isolator with Built-in Power Transfer - no external power supply needed
USB2ISO USB 2.0 Full Speed Isolator US$59.95     Free Express Shipping


1. The USB 2.0 Galvanic Isolator is used for:
1) Protection of computer and attached USB devices - GREAT for LAB & Field use!
2) Protection of electronic test and measurement devices such as USB oscilloscopes and USB signal generators, as well as the circuits under test, when doing electronic measurements
3) Protection of programmers and circuit boards when programming embedded boards
4) Allow safe serial port galvanic separation for communication
5) Avoiding ground loops between devices - for instance PC->USB2ISO->USB SoundCard->Audio Power Amplifier to eliminate hum created by gound loops

2. Package Contents
1) USB2ISO USB 2.0 high speed isolator (Made in Denmark)
2) 0.25 m USB extension cable (it can be put between the USB port of the USB hub or PC and the USB2ISO so as to avoid excessive forces on the USB port)
*One year warranty

3. How does it work?
Just plug your USB device into the USB2ISO's connector and then plug the USB2ISO into a USB port of a HUB or PC. To avoid excessive force on the USB port of the HUB or PC, you may put the USB cable supplied in between. The PC and your USB device now have no electrical connection but can still talk to each other. The USB2ISO module also transfers power from the PC to your USB device with no electrical connection. Your USB device is now protected and can be attached to other ground potentials without any ground loops that could destroy your computer, USB device and other attached electronic devices.


USB2ISO USB 2.0 Full Speed Isolator Diagram


4. Specifications

USB Speed USB 2.0 Full Speed (12 MBps) 
Data Isolation 1 kV 
Power Isolation  1 kV 
Power Output  >400 mA output, 5V +/- 10% 
(Note: many USB isolators in the market are unable to provide this amount of power which is critical for those power demanding USB devices such as USB oscilloscopes)
Temperature Range  -40 °C ~ 50 °C 
Humidity 25% ~ 75%
MTBF >1.2Million Hours – MIL standard
Based on Analog Devices Adum4160/Adum3160 and High Grade Class 3 Isolated Power Supply
Compliance  FCC, CE 
Physical Dimensions 50 x 25 x 12 mm (2 x 1 x ½ in)
Connectors USB-A-Plug for PC
USB-A-Socket for USB cable to device

5. Supported VT Hardware
One isolator provides sufficient power to VT DSO-2810R, 2810, 2810E, 2820R, 2820, 2820E, 2A10, 2A20, RTA-168A, 168B, 333D01
Two isolators provides sufficient power to VT DSO-2A10E, 2A20E. A USB cable with two heads on the PC side should be used in this case.

Note:
(1) The second-generation of VT DSOs support USB2.0 high speed (480MBps) if connected to a USB 2.0 port. This is preferrable as it is much faster than USB full speed (12MBps), resulting in much faster screen refresh rates, and much higher sustainable sampling rates under the streaming mode. However, it should be noted that for many computers (typically desktop PCs or laptop PCs with a built-in AC power supply adapter), the ground line of the oscilloscope probe is connected to the ground of the USB port which is connected to the mains earth through the computer's power cord. This is not a problem if the circuit under test is floating (i.e. isolated from earth). Otherwise, you MUST make sure that the ground lead of the probe is connected to a point on the circuit that is also at earth potential, or else a USB isolator should be used.
 
(2) There are some USB oscilloscopes in the market that claim to have an isolated USB port. It maybe good to have an integrated design, however, they can only support USB full speed (as there is no USB high speed isolator in the market) and thus suffer from low communication data rate.  This is a drawback when USB isolation is not required.     
 
5. Examples
1. How to make floating or isolated measurements and break the ground loop with a USB oscilloscope? 



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