105
Recording
Data recording example
Monitor road noise and record sound pressure waveform when a given level is exceeded
The sound level meter NL-42/NL-52/NL-62 is used to measure noise levels.
The comparator signal and AC signal of the sound level meter are used for
recording the waveform on the DA-21.
Input the comparator signal of the sound level meter to the Ext. Trig. con-
nector of the DA-21, using the comparator output cable CC-42C. For voice
memo recording, connect the optional voice memo microphone to the Voice
Input connector. Input the AC signal of the sound level meter to the channel
1 (CH1) connector of the DA-21.
Make the DA-21 settings as follows.
Input settings (using <Input> menu)
CH
Inp
HPF
LPF
Sens
Sensitivity
1
AC
OFF
OFF
SLM
Level range value: dB
2
OFF
OFF
OFF
3
OFF
OFF
OFF
4
OFF
OFF
OFF
5
Voice Memo
OFF
OFF
(CH1 is to be used for waveform recording. CH5 is to be used for voice
memo recording.)
Auxiliary functions
• Set device index number to level range value of sound level meter (for
calibration signal recording: see page 84)
• Set comparator level of sound level meter to level of signal to record.
• Set key lock to ON.
Содержание DA-21
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