Yokogawa DR240 - Manual (Page 30)

2-4 IM DR232-01E
Scan Interval
• The duration of time (one scan) in which the measurement of all channels is carried out, is
called the scan interval.
• This interval can be set to any value from 0.5 second to 60 seconds. The shortest is 300 ch/500
ms (varies with the shortest measurement period of the input module).
A/D Integration Time
This instrument measures the input signal after putting it through an A/D converter. In order to
minimize the noise imposed on the input signal, specific integration times exist.
The integration time can be selected from 20ms (50Hz), 16.7ms (60Hz) and 100ms (10Hz).
When “AUTO” is selected, the integration time will be automatically decided according to the 50/
60Hz frequency of the power supply.
AUTO does not function if the instrument is the subunit (DS400/DS600) of the DC power supply
model (Selecting “AUTO” will set the A/D integration time to 20 ms (50 Hz)). If you are using
the instrument on a 60-Hz power supply, set the A/D integration time to 16.7 ms (60Hz).
Input Filter
A filter can be set ON/OFF to reduce normal mode noise. Effects on normal mode noise are as
follows depending on the filter being ON/OFF (theoretical values).
0dB
–20dB
–40dB
–60dB
–80dB
–100dB
1Hz 10Hz 100Hz 50Hz 300Hz
Slope:–20dB/dec
Slope:–60dB/dec
Filter OFF
Filter ON
Frequency
Attenuation
2.2 Measurement Input Functions