FAQ

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Regardless of whether you are using the evaluation board "M-G32EV041" or not, USB extension cables may degrade communication quality, so caution is required.（so, please be careful.）
When extending the cable, we recommend using a USB active repeater cable or USB extender that has a built-in function to prevent signal degradation.

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USB hubs can be used.
Not only when using the evaluation board "M-G32EV041" but when (However, whether or not the evaluation board "M-G32EV041" is used, if)multiple sensors are connected to a bus-powered USB hub, there is a possibility that communication will not be possible due to insufficient power. We recommend using a self-powered USB hub.
In addition, do not cascade USB hubs.

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"Vibration Logger" may not have been installed correctly. Please try reinstalling it.
*Before reinstalling, be sure to uninstall (delete) "Vibration Logger". To uninstall, select "Vibration Logger" from "Programs and Features" in the Control Panel and perform the uninstallation.

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There may be a communication error between the sensor and the PC. To restart the sensor, unplug and replug the USB cable connected to the sensor.

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There may be a communication error between the sensor and the PC. Please close and restart "Vibration Logger". Also, to restart the sensor, please unplug and replug the USB cable connected to the sensor."

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The calculation resolution is 0.002 µrad/LSB (≒1.15×10^(-7)°/LSB), and the measurable range is ±1.0472 rad (≒±60°).
In the actual measurement environment, the actual resolution is lower than the calculation resolution due to the effects of environmental vibration and temperature changes. This actual resolution depends on the environment in which it is used, so we recommend that you check whether the desired tilt change can be detected in the environment in which it is used.
We have a track record of detecting tilt changes of approximately 17 µrad (≒0.001°) while controlling environmental vibration and temperature changes.

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The calculation resolution is 0.06 µG/LSB, and the measurable range is ±15G.
Note that the resolution" and "minimum detectable acceleration" of our accelerometer are different. The minimum detectable acceleration has the characteristic of changing depending on the frequency. For example, in the case of the M-A352AD10, it is 0.12µG/√Hz in the frequency range of 1 to 20Hz. In the case of the M-A552AR10, due to its structure, it tends to be slightly higher than this.
Please check the "Example of main characteristics (noise density)" on the brief sheet for the minimum detectable acceleration for each frequency.

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The fluctuation that occurs immediately after the start of measurement is a transient response of the integration process.
This transient response converges after a certain amount of time has passed. It takes 10 seconds for the vibration velocity to converge, and 60 seconds for the vibration displacement to converge.
If fluctuations in the output value affect the evaluation, exclude the data from the section where the transient response is occurring.

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When measurement begins, bias changes occur due to circuit heat generation. This change converges in Typ. 5 min if the bias stabilization function is ON, and Typ. 15 min if it is OFF. After that, it becomes stable.
If bias stability affects the measurement, we recommend performing measurement after the bias has stabilized.
*If measurement is started when the temperature around the sensor has changed or the sensor is exposed to wind from an air conditioner, the time it takes for the temperature inside the sensor to stabilize will change, and the convergence time will also change.

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We guarantee an MTBF of 87,600 hours (10 years).
*MTBF stands for Mean Time Between Failure.

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Both have a shock resistance of 1000G (action time 0.2ms half-sine).

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The detection element of the vibration sensor detects acceleration. This acceleration value is integrated once inside to convert it into vibration velocity, and integrated twice to convert it into vibration displacement, which is then output.

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The output rate for vibration velocity mode is 3000sps, and for vibration displacement mode it is 300sps.

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Output rates can be selected from 1000, 500, 200, 100, and 50 sps.

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The accelerometer is a sensor that can measure acceleration and inclination.

In contrast, the vibration sensor is a sensor that measures vibration velocity and vibration displacement. In addition, The vibration sensor are sensors that comply with ISO10816.

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By using the optional evaluation tool magnetic base "M-A52EV161", it can be installed using a magnet.

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It is insulated.

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When installing, tighten the bolts and nuts to a torque of 1.5 Nm.
If the bolts and nuts are tightened too much, the insulating coating on the surface of the magnet base may be scraped off, causing electrical conductivity. In addition, repeated tightening may cause the insulation to peel off.
We recommend that you use the appropriate tightening torque.

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The magnetic force of the magnet is very strong, so there is a risk of accidentally subjecting the sensor to strong shocks. Install the sensor carefully to avoid shocks.

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Perform a self-test after turning on or initializing the power supply and before starting a measurement.
If you perform a self-test after a measurement, it may not run correctly in rare cases.
In that case, perform a software reset and then perform the self-test.

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The accelerometer has two main types of filters built in.
1. FIR filter
1.1 FIR Kaiser filter: A selectable filter.
1.2 User-defined filter: Use this if you want to adjust the filter yourself.
2. Long-period filter (HPF, LPF): A moving average filter for long-period measurements, separate from the FIR filter.

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If the frequency of the measurement target is unknown, the widest bandwidth is used: Sampling frequency = 1000sps, TAP512, fc = 460Hz

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Becausethe accelerometer uses an FIR filter, a certain amount of delay occurs due to the filter processing.
This delay amount varies depending on the number of taps in the filter, and is 63.875ms at 512 taps, 15.845ms at 128 taps, and 7.875ms at 64 taps. The delay amount can be calculated as group delay amount = (number of taps - 1)/2*0.250µs.

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When measuring withthe accelerometer's internal timer, only sampling frequencies and filter settings that suppress aliasing by -60dB or more can be applied.
When using a user-defined filter or external trigger, set the cutoff frequency to 1/2 the sampling frequency or less.

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The accelerometer is equipped with a "user-defined FIR filter" that allows the customer to set the filter coefficients as desired.
Please refer to "User-defined FIR filter" in the data sheet for the setting method.

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The long-period filter is a moving average filter for long-period measurements.
Use this when you want to apply a long-period filter in addition to the FIR filter.
For instructions on how to set up a long-period filter, see Long-period Filters (HPF, LPF)" on the data sheet.

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The accelerometer M-A352AD10" can control the measurement timing externally by using the external trigger input function.
Please refer to "External Trigger Input" on the data sheet for the setting method.
In addition, since it does not have a time synchronization function, please synchronize the time and trigger on your system if necessary.

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The accelerometer "M-A552AR10" does not have an external trigger input function, so synchronous measurement is not possible.

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The accelerometer has two types of noise floor conditions, which can be switched between.
The factory setting is "Standard Noise floor condition".
If you want to capture even smaller vibrations at frequencies of 3Hz or higher, set it to "Reduced Noise floor condition". It is not effective for vibrations below 3Hz.
Please note that the "Reduced noise floor condition" consumes more current during measurement than the "Standard noise floor condition".
For setting instructions, see "Low noise floor measurement" in the data sheet.