What kind of filter is on the input to a 44704A, and how do I turn it on?
The 44704A has a one pole low pass filter. It is a simple RC circuit buffered from the input. The cut off (3 dB point) is 2.5 KHz. The filter is enable with the command FILTER ON and disable with the command FILTER OFF. The equivalent RC network for this filter is:
C = 0.022 uF
R = 2.8 Kohms (6.378 Kohms in parallel with 5 Kohms)
The time constant is 62 microseconds and the cutoff point is:
1 / (2 pi * RC) = 2584 Hz