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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.