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SoundMeter / Re: Calibrate MicW i437L
« Last post by FaberAST on October 01, 2018, 06:29:07 PM »
According to MicW's current instructions, you should set the device gain to Mid and the device units to FS. Then, set the sensitivity for the input channel according to the value that was written on the sheet that came with your i437L (e.g. 19.9 Pa/FS). (Make sure input channel units are set to Pa.)

We just tested this, today, with an iPhone X and XS Max, and the results agreed within 0.1 dB of a 94 dB field calibrator on both devices.

Keep in mind that the sensitivity given by MicW is valid for the Mid gain setting, only. If you want to measure higher or lower SPLs which would require Low or High gain, respectively, you would need to perform a calibration at the chosen gain.
SoundMeter / Re: Calibrate MicW i437L
« Last post by stenand on September 29, 2018, 04:02:10 PM »
Hi mgolden,

just bought the same mic and I'm curious to know if you ever came around to check your calibration?

SignalScope / Re: Frequency Measurement
« Last post by FaberAST on September 25, 2018, 07:02:25 PM »
It's true that there are no physical knobs for adjusting the Oscilloscope display.

Perhaps, you have already found that if you look in the Display tab of the drawer on the bottom side of the Oscilloscope window, you'll see the software controls for adjusting the amplitude (Vert) and time (Horz) scale of the scope.

Frequency measurements can be made with the Oscilloscope, using the dual data cursors, but it would be easier to measure frequencies with the FFT Analyzer. However, if you need very fine precision, it may be better to use the Oscilloscope.
SignalScope / Frequency Measurement
« Last post by tinskip on September 22, 2018, 04:21:55 PM »
I am finding doing frequency measurements with SignalScope to be difficult.  It has to be done visually  and by hand, and there are no physical knobs to tweak the time axis like in a hardware scope.

Ideally the fundamental frequency would be available somewhere.  Am I missing something?
SoundMeter / Re: MicW i436 calibration with updated I/O config iPhone Se/ipad
« Last post by FaberAST on March 22, 2018, 06:45:52 PM »
Hello Martijn,

Which MicW model are you using? Which version of SoundMeter?

If you are not seeing the option to select between FS and V for the device, that suggests that your MicW is either not connected properly, or that you have the built-in mic selected as the current input device. (FS stands for Full Scale, which is the maximum digital value that can be represented by the input hardware.)

If you think it will help, you are welcome to attach or send screenshots that illustrate the problem you are experiencing.

Best regards,

Ben Faber
SoundMeter / MicW i436 calibration with updated I/O config iPhone Se/ipad
« Last post by MartijnVeulemans on March 22, 2018, 02:34:43 AM »
Hi, since I got an updated I/O config on the soundmeter Pro I did not manage to calibrate it with the Volt settings of the MicW. Following the blog and also MicW's guideline's I encounter a change of settings, Device settings are no longer in V, but in FS or Pa! (what means FS?)
By selecting Pascale as device settings and under input channels (all channels to Pa)/calibrate, I only can set the input sensitivity to Pa/Fs. If I insert the mV settings I get the strangest readings compared to other SL meters.
What is the workaround, how do I set my 5.7mV/Pa correctly?
This occurred also on the iPad, which worked correctly before I/O update.

Thank you,
SoundMeter X / Welcome to the SoundMeter X discussion
« Last post by FaberAST on March 21, 2018, 04:33:53 PM »
SoundMeter X, the successor to SoundMeter and SoundMeter Pro, is available as a free download from the App Store and offers subscription-based upgrades for sound analysis and data logging.

See our note about moving to subscriptions on the blog.
SignalScope X / Welcome to the SignalScope X discussion
« Last post by FaberAST on January 10, 2018, 03:17:36 PM »
SignalScope X, the successor to SignalScope and SignalScope Pro, includes a free oscilloscope and subscription-based tool sets to meet your more serious needs.

See our note about moving to subscriptions on the blog.
SignalScope / Re: RTA Averaging
« Last post by Dengser on November 30, 2017, 02:03:20 AM »
Yes. With those settings, you'll get the average sound level over 20 seconds in each whole or 1/3 octave band, plus an overall (full bandwidth) average level. You can see the overall level by tapping the graph to turn on the cursor.

Hi Faber, when I tap the graph nothing happens. Is this a bug?
SoundMeter / Re: Calibrate MicW i437L
« Last post by FaberAST on November 27, 2017, 04:50:01 PM »
Unfortunately, the i437L presents itself as if it were a standard headset jack. This means that apps like SoundMeter cannot automatically distinguish between an i437L and a standard headset jack.

Your approach is correct (i.e. Device Units = FS, Channel Units = Pa, Gain = Mid). We do not know the precise input gain used by MicW when testing the sensitivity of the i437L, but using the Mid gain setting in SoundMeter seems to work well.

It's too bad MicW didn't take advantage of the opportunity to produce a digital microphone that presented itself uniquely to iOS. That would have allowed automatic loading of sensitivity information, similar to what SignalScope does with the Digiducer digital accelerometers.
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