If the outbound devices are then seen by instruNet World (after Reset), then this indicates that a very high frequency exists between the two grounds and is causing problems. If the outbound devices are not seen by instruNet World, try temporarily holding a wire between the outer shell of the isolator inbound and outbound DB-25 connectors.
#OPTICAL ISOLATOR TUTORIAL SOFTWARE#
Installing instruNet Hardware & Software.In a worse case scenario, this would reduce the maximum sample rate 3 to 1. Since the optical isolators introduce delays, the Model 330 reduces the speed of the instruNet network from 4M bits/sec to 1.33M bits/sec, on short networks. If this is also tied to the 3rd prong of the power supply AC input connector, and you want to isolate instruNet from this earth ground, then you would need to place a 2-to-3 prong Adaptor at the power supply input connector (or rip the 3rd prong out of the plug with a pair of strong pliers). The External Power Input pins 1 and 2 are both tied to the outbound instruNet device ground (case and pcb). With 4 instruNet Devices, without ground loops, is illustrated below:
GND terminal to a nearby local earth ground is recommended. To earth ground, as shown in the below illustration. This will keep the instruNet box ground from radiating with respect However, it is recommended that the instruNet box GND screw terminalīe attached to either your device under test ground (which is attached to earth ground), orĭireclty to earth ground. Performing a measurement without adverse effects (assuming all wires to the box are floating)ĭue to this isolation. the instruNet GND terminal shorted to AC power !) while Once isolated, one can attach 110/220VAC powerĭirectly to the instruNet box (i.e. These isolators, the transformer in an external power supply, and a 2-to-3 prong power adapterįully isolate the instruNet measurement box. The internal circuitry of the i330 (Rev 2) is summarized below.īreak Ground Loops and Reduce High Frequecies between Grounds with the i330Įffecting your measurements, one should consider installing an #iNet-330 Optical Isolator. Model 330 Electrical Isolator Block Diagram Since each side of the i330 optical isolator requires power, as shown below. Two i312 power supplies when working with the i330 (Rev 2), Typical Isolated system with i240 USB controller Newer Revision 2, described below, except power is cabled differently. The Model 330 optical-isolator manufactured before NovemberĢ010 is referred to as "i330 Revision 1". Multiple Model 330's can be placed in one network (e.g. <10mV), optical isolation is sometimes critically important. This is often used to eliminate ground loops between the computer and items under test,Īnd to reduce noise that is transmitted from the computer to sensors. In high-speed optical fiber transmittance amplifiers and routes, they are considered indispensable devices due to their capability of eliminating the adverse effect of return beams.The Model 330 Electrical Isolator provides 1000 Volts of optical isolation at one point within an instruNet It is thus a key device in order to achieve stable laser diode operation. This helps in not affecting the coherence of the laser affecting any damage to the diode itself as feedback is capable of frequency shift, noise, mode hopping or amplitude fluctuation. Optical isolators are used in many applications, such as laser applications where they are used to prevent unwanted feedback into the laser source. Polarization-dependent isolators use input and output polarizers along with a Faraday rotator, whereas polarization-independent isolators use input and output birefringent wedges along with a Faraday rotator. Optical isolators can also be categorized into polarization-dependent isolators and polarization-independent isolators.
Optical isolators are available with high power and low-power polarizers. In this manner, energy is either absorbed or reflected depending on the polarizer type. The rotator then rotates the polarization of the input light by 45 degrees and is allowed to exit through the output polarizer. The input polarizer is arranged to act as a filter and only allows linearly polarized light into the rotator. An optical isolator is comprised of a Faraday rotator with magnet, input polarizer and output polarizer.
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