Detect sound through mic using preamplifier AND a NI USB-6381 BNC DAQ

[philperd17]

Hello!

I am trying to detect sound waves using a mic, a preamplifier and a NI USB-6381 BNC DAQ.

I have been trying to detect it as a voltage input but I get too much noise at more or less 3-5mV spikes (looking to detect a very small sound). I am using a soundproof box so the noise much be internal.

I tried to change input to sound pressure but I get an error:

Error -200431 occurred at DAQmx Create Channel (AI-Sound Pressure-Microphone).vi:6950001

Selected physical channel does not support the measurement type required by the virtual channel you are creating.
Create a channel of a measurement type that is supported by the physical channel, or select a physical channel that supports the measurement type.

Property: AI.MeasType
Requested Value: Sound Pressure:Microphone
Possible Values: Current, Resistance, Strain Gage, Temperature:Built-in Sensor, Temperature:RTD, Temperature:Thermistor, Temperature:Thermocouple, Voltage, More:Voltage:Custom with Excitation

Task Name: _unnamedTask<1E>

Any ideas/suggestions are very very much appreciated!

I look forward to reading your answers!

Thank you!

[philperd17]

Hello!

I am trying to detect sound waves using a mic, a preamplifier and a NI USB-6381 BNC DAQ.

I have been trying to detect it as a voltage input but I get too much noise at more or less 3-5mV spikes (looking to detect a very small sound). I am using a soundproof box so the noise much be internal.

I tried to change input to sound pressure but I get an error:

Error -200431 occurred at DAQmx Create Channel (AI-Sound Pressure-Microphone).vi:6950001

Selected physical channel does not support the measurement type required by the virtual channel you are creating.
Create a channel of a measurement type that is supported by the physical channel, or select a physical channel that supports the measurement type.

Property: AI.MeasType
Requested Value: Sound Pressure:Microphone
Possible Values: Current, Resistance, Strain Gage, Temperature:Built-in Sensor, Temperature:RTD, Temperature:Thermistor, Temperature:Thermocouple, Voltage, More:Voltage:Custom with Excitation

Task Name: _unnamedTask<1E>

Any ideas/suggestions are very very much appreciated!

I look forward to reading your answers!

Thank you!

[GerdW]

Hi Phil,

---

@philperd17 wrote:

I tried to change input to sound pressure but I get an error: Error -200431

Selected physical channel does not support the measurement type required by the virtual channel you are creating.

Possible Values: Current, Resistance, Strain Gage, Temperature:Built-in Sensor, Temperature:RTD, Temperature:Thermistor, Temperature:Thermocouple, Voltage,

Any ideas/suggestions are very very much appreciated!

---

How much more suggestions as was already given in this error message do you need?

Trying to messure "sound pressure" is not supported by your hardware, but reading plain voltage values is recommended…

Why do you think reading the same signal as "sound pressure" instead of "voltage" will reduce noise?

[philperd17]

Hello!

I am trying to detect sound waves using a mic, a preamplifier and a NI USB-6381 BNC DAQ.

I have been trying to detect it as a voltage input but I get too much noise at more or less 3-5mV spikes (looking to detect a very small sound). I am using a soundproof box so the noise much be internal.

I tried to change input to sound pressure but I get an error:

Error -200431 occurred at DAQmx Create Channel (AI-Sound Pressure-Microphone) .vi: 6950001

Selected physical channel does not support the measurement type required by the virtual channel you are creating.
Create a channel of a measurement type that is supported by the physical channel, or select a physical channel that supports the measurement type.

Property: AI.MeasType
Requested Value: Sound Pressure: Microphone
Possible Values: Current, Resistance, Strain Gage, Temperature: Built-in Sensor, Temperature: RTD, Temperature: Thermistor, Temperature: Thermocouple, Voltage, More: Voltage: Custom with Excitation

Task Name: _unnamedTask <1E>

Any ideas / suggestions are very very much appreciated!

I look forward to reading your answers!

Thank you!

[GerdW]

Hi Phil,

what's wrong with my answer you got several days ago that you need to start two more threads with the very same question?

Your hardware only supports the measurement types listed in this error message…

(Please don't create double posts/threads - that's considered rude behaviour!)