Amplifiers
4-16
DC Input Amp (AR-GXDC)
The AR-GXDC is an amp for inputting signals converted to voltages.
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Filters
Analog Filter
The analog filter is an 8th order Butterworth low-pass filter (–48
dB/oct). The cutoff frequency can be selected independently of the
sampling frequency. To prevent aliasing, the cutoff frequency must be
set to 50% or less of the sampling frequency.
Digital Filter
The digital filter using a DSP can attenuate from 40% of the set sam-
pling frequency. The digital filter is not functional at sampling fre-
quencies of 200 kHz, 100 kHz, and 50 kHz.
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Calibration
Zero and gain self-calibration using a DSP is performed whenever
power is turned on, and whenever the input range or the sampling fre-
quency is changed. The signal used for calibration is built into the
amp.
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