sound level meter Frequently Asked Questions

Both outputs have an output resistance of 50Ω ± 2%, but they do not have the capability to drive a 50Ω termination. Please be sure to use instruments with an input impedance of at least 10kΩ.

1. AC output

The AC output includes an error margin (up to 15%), so please be sure to calibrate using an electrical calibration signal before use. In both normal and wide range AC outputs, the analog processed signal is output directly. During dual measurement, the main signal is output.

When using the octave filter option, the signal that has passed through the digital filter is output from the D/A converter. In this case, the sampling rate is 48kHz. When using the real-time option, the signal from ALLPASS1 is output.

DC output

The DC output primarily outputs a signal linked to the bar indicator from the D/A converter. The update cycle of the bar indicator is 100 ms, while the update cycle of the D/A converter is approximately 1.3 ms, which is sufficient to handle a dynamic characteristic of 10 ms. During dual measurement, the main signal is output.

When using the octave filter option, the signal that has passed through the digital filter is output from the D/A converter. The sampling rate in this case is 48kHz.

During memory data readout, the bar indicator reflects the read data, while the DC output shows the currently input signal. When using the real-time option, the AC output will similarly output the ALLPASS1 signal.