Refer to sensor documentation to determine this value. This value is in the units you specify with the sensitivity units input.
4.1 sound system mic input driver#
A virtual channel is a concept of the NI-DAQmx driver architecture used to represent a collection of device property settings that can include a name, a physical channel, input terminal connections, the type of measurement or generation, and scaling information.
Using an NI-DAQmx Global Virtual Channel, you can configure a microphone measurement without any programming. You can use MAX to quickly verify the accuracy of your measurement system setup.
To minimize ground noise, keep the metal shells of the connectors from touching each other, the DSA device(s), or the chassis/computer.
The shell of the connector, AI-, provides the excitation return path and the signal ground reference. The center pin of the connector, AI+, provides the DC excitation, when enabled, and the positive input signal connection. NI DSA devices use BNC or SMB connectors. The next step is to physically connect the microphone to your DSA device.
4.1 sound system mic input series#
It exists only between ground and either of the signal pins, but a dynamic microphone won’t “see” it, because its transducer is only connected to the two signal pins.An IEPE sensor needs an appropriate cable and/or connector to hook into the BNC inputs of the C Series module. So there is no voltage difference between hot and cold, and that’s why it’s called phantom power: It is there and it isn’t. Phantom power is a DC voltage, whose positive side is applied to both signal pins. The signal is between hot and cold ground is connected to the cable shield. What Exactly Is Phantom Power, and Can It Be Dangerous to Humans?Ī studio microphone operates with a balanced output: There are three pins: hot, cold and ground. Phantom power shouldn’t harm ribbon mics, either, but since they are very fragile, there is no safety margin in the event of faulty connections or (accidental) hot plugging while P48 is already on. However, just to be safe, it’s better to keep phantom power deactivated for ribbon mics. As long as everything is wired correctly, phantom power does not affect dynamic mics, at all. But what if you want to use a dynamic and condenser mics at the same time, and there’s only a global switch for phantom power? That’s no problem, really. moving coil and ribbon mics, don’t require phantom power (a rare exception being “active” ribbon mics). Can Phantom Power Harm Dynamic Microphones?ĭynamic microphones, i.e. Always connect your mic directly to the XLR mic input. Also, puttting mic inputs on a patchbay is not recommended. Any device in-between will likely block phantom power and/or degrade the sound quality. Also, never put anything between your mic and your microphone input. Hot plugging while P48 is already activated can harm your mics. Some audio interfaces don’t have a hardware switch, at all instead you must activate phantom power via their control software.Īs a general rule: Always connect your mic(s) first, before you turn on phantom power. Sometimes there is a global switch for all microphone inputs more expensive devices often come with individual P48 switches for each input. All you have to do is press the button labeled “P48”, “48V”, or “Phantom Power”. Just about any microphone input, these days, is equipped with phantom power. The international standard is P48 phantom power (a Neumann invention, by the way). Condenser microphones require external power for their internal electronics.
0 kommentar(er)
