Instruction manual

100
Input/Output Connectors
The relationship between the display value shown by the unit and
the output voltage is indicated below.
When the unit is set to the calibration mode, the output signal (output
level range upper 120 dB - 6 dB = 114 dB, 1000 Hz sinusoidal wave)
is 0.5 Vrms.
Output voltage (Vrms)
10
1
0.1
0.01
0.001
100
10
-90 -80 -70 -60 -50 -40 -30 -20 -10 FS +10
Scale (dB)
FS: Full-scale value
Ideal characteristics of the display value and the output voltage
Group Delay
The unit incorporates an A/D converter which converts the microphone input
signal into digital format for processing by a DSP chip. The result is then
returned to analog format by a D/A converter and output as an AC signal.
Due to this process, the output signal has a constant delay (group delay)
with regard to the microphone input signal. The delay time is about 700 µs
in waveform recording, and about 1.3 ms in AC OUTPUT.