The DEMOD-DVRT and the DEMOD-DVRT-TC signal conditioners both have a Low Pass Filter.
The filter is described as: 2 pole, active Butterworth, 3 dB down @ 800 Hz standard; factory adjustable 10 Hz-8 Khz
The filter is modified by manipulating resistors on the circuit board.
Resistors may either be removed or added or both.
These resistors may go into standoff sockets or require soldering/desoldering on the circuit board surface.
After the rework is done, good practice dictates that the signal conditioner and its paired sensor be recalibrated to reflect changes in noise characteristics.
We recommend that such work be done here at the factory.