DPA-2FX User Manual
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version 1.8
page 9
Filter unit
The filter unit consists of (
5
) LOWPASS filter and (
12
)
HIGHPASS filter.
(
5
) LOWPASS filter
Single pole LOWPASS filter with 6 dB / octave. Corner frequencies: 30, 100, 300,
500, 700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k Hz.
(
12
) HIGHPASS filter
Single pole HIGHPASS filter with 6 dB / octave. Corner frequencies: 3, 30, 100,
300, 400, 500, 600, 800, 1k, 3k, 10k Hz. In OFF position the filter is disabled.
Note
: By combining HIGH- and LOWPASS filters, a filter with bandpass characteristic can
be implemented easily.
(
6
) + OVER, - OVER LEDs
LEDs indicating that the DPA-2FX exceeds it’s linear range (
10 V).
(
7
) OUT connector
BNC connector providing the conditioned signal.
(
8, 9
) – IN, + IN connector
BNC connectors for connecting the input signal. The inputs can be used in single
ended or differential configuration. In differential configuration the signal which is
connected to –IN is subtracted from the signal that is connected to +IN. If only one
input is used (single ended configuration) the other should be grounded to avoid
coupling of noise.
(
10, 11
) input coupling switches
The position of the input coupling switch decides how the input signal is
coupled:
AC:
the input signal is AC coupled with a corner frequency of 0.1 Hz
DC:
the input signal is DC coupled
0:
the input signal is grounded.
