Instrument Configuration 3
U8903A User’s Guide 59
Digital filters
Digital filters are used to bandwidth limit the input signals
before applying a measurement function. There are three
selectable filter types consisting of low pass, high pass, and
weighting as shown in the figure below. Up to three filters,
one from each type, can be applied to the signal
simultaneously. The U8903A also allows user- defined filters
to be uploaded to the device. Refer to “Appendix C:
User- defined Filter File Format” on page 144 for more
information on the user- defined filter file format.
Figure 3-5 Digital filter selection
The low pass, high pass, and weighting filter selection is as
follows.
Table 3-1 Filter selection
Low pass filter High pass filter Weighting filter
15 kHz 22 Hz A-Weighting
20 kHz 100 Hz CCIR-1k weighted
30 kHz 400 Hz CCIR-2k weighted
User-defined User-defined C-Message
CCITT
User-defined
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