Rion DA-21, Инструкция по эксплуатации

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Menu Operations and Setting Items
Menu Items
Setting items are organized in six pages, with related items appearing together
on one page. The contents of each menu page are described below.
<Input> menu
Allows you to select the sensor (signal) type, input signal fi ltering, sensor
sensitivity level and units for each channel.
Inp Sensor (signal) type setting (CH1 to CH4)
Controls the input on/off setting and sensor (signal) type.
OFF Select this setting when the input is not to be used.
DC This setting is for input of an electrical signal, with the re-
cording to include DC components. This is suitable for en-
vironment sensors (temperature, wind speed, pressure, etc.)
and sound level meters that output the measurement value as
a DC signal. The setting should also be used when recording
a signal (such as from a vibration level meter) that comprises
frequency components below 1 Hz.
AC This setting is for input of a normal electrical signal, with
the recording to exclude DC components. This is suitable for
sound level meters, vibration meters and similar equipment
that outputs the measurement value as an AC signal. The cutoff
frequency is about 0.3 Hz.
Note
When Input is set to AC, a high-pass fi lter with a cutoff
frequency of 0.3 Hz is applied. However, if the input
signal contains high-level DC components that exceed
the input range, overload may occur in the DA-21.