Rion DA-21, Инструкция по эксплуатации

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Preparations
Recording parameter settings
This section describes how to set the parameters for recording data. Input
range, frequency range, sampling frequency, and recording time are required
items. If necessary, you should also set the Pre Recording Time, trigger, and
other related items.
Input range setting
The input range can be set to seven levels in 10 dB steps (0.01, 0.03, 0.1, 0.3,
1, 3, 10 V). Select an appropriate setting according to the input signal level
and the operation method of the DA-21.
For improved S/N ratio, setting the input range as low as possible without
causing overload is generally preferred. For inspection of products and oth-
er kinds of periodic measurements, it may be necessary to keep the input
range setting the same, in order to allow product comparisons and to detect
deterioration over time.
To set the input range, proceed as follows from the main screen.
(The setting cannot be changed in recording or recall mode.)
1. Activate cursor in input range display section
Press the [RANGE] key to cause the input range display section
to be shown in reverse (cursor active).
RANGE
2. Select the channel for which to change the input range
Use the [ ]/[ ] keys to move the cursor to the channel whose
input range setting you want to change.
ENT