O
PERATOR
’
S
M
ANUAL
The following examples illustrate how you might use the instrument's enhanced resolution function.
In low-pass filtering:
The spectrum of a square signal before (left top) and
nal.
cement, the lower the resulting bandwidth.
after (left bottom) enhanced resolution processing. The result clearly
illustrates how the filter rejects high-frequency components from the sig
The higher the bit enhan
To increase vertical resolution:
In the example at left, the lower ("inner")
enhanced resolution
trace has been significantly enhanced by a three-bit
function.
To reduce noise:
The example at left shows enhanced resolution of a
noisy signal. The original trace (left top) has been processed by a 2-bit
enhanced resolution filter. The result (left bottom) shows a "smooth" trace,
where most of the noise has been eliminated.
Note:
En
ution can only improve t
ace; it cannot improve t
hanced resol
he resolution of a tr
he accuracy or
linearity
uantization. The pass-b
al attenuation for signal
-off
of the original q
and will cause sign
s near the cut
frequency. Th
st frequencies passed may be sli
attenuated. Perform the filtering on finite record
e highe
ghtly
lengths. Data
e lost at the start and end of the wa
rm: the trace will be slightly shorter after filtering.
will b
vefo
The number of samples lost is exactly equal to the le
the impulse response of the filter used: between 2
ngth of
and 117 sam
Normally this loss (just 0.2 % of a
point trace) is not noticed. However, you might
ples.
50,000
filter a record
re would be no data output. In
r, the instrument would not allow you
so short the
that case, howeve
to use the ERES feature.
WRXi-OM-E Rev C
133
