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15-20

IM 701210-06E

15.6 Using the Knocking Filter (DSP Channels)

Setting the Unit

Unit can be set arbitrarily using up to four characters. The specified characters are

applied to the scale values.

Notes When Using the Knocking Filter

The following limitations exist depending on the acquisition mode setting.

• When the Acquisition Mode Is Set to a Mode Other Than Envelope

The digital filter frequency is set in terms of a percentage of the sampling frequency.

For example, if the sampling frequency is 100 kHz and you set the cutoff frequency to

10%, the cutoff frequency is set to 10 kHz. If the sampling frequency exceeds 100

kHz, the sampling frequency of DSP channels is decimated to 100 kHz. Therefore, if

the sampling frequency exceeds 100 kHz, the specified frequency is a percentage of

100 kHz regardless of the actual sampling frequency.

• When the Acquisition Mode Is Set to Envelope

The sampling frequency of DSP channels is fixed to 100 kHz. The digital filter

frequency is set in terms of a percentage of 100 kHz.

Note

For other notes concerning DSP channels, see section 15.1.

YOKOGAWA DL750 User Manual

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