Hioki 3290-10, Instruction Manual

Page: 101 / 152

5.4 Filter Function
95
1
2
3
4
5
6
7
8
9
10
5
A
ppl
ic
a
b
le
M
easurement
M
o
d
e
s
Measurement Modes: DC, AC, AC+DC
This function can remove unwanted frequency components such
as noise.
1.
Press
SHIFT
→
(
FILTER
).
2.
The Filter function is enabled.
DC Mode When OUT1 is set to MON output, press
SHIFT
→
(
FILTER
) to
change the OUT1 display to
MON.FL
.
The OUT1 output is passed through a low-pass filter with cut-off
frequency (fc) of about 1 Hz. AC components such as mains fre-
quencies are removed, so this function is useful if noise or ripple is
present on DC current. The displayed value is always passed
through another low-pass filter of about 0.5 Hz.
AC and
AC+DC Modes
Press
SHIFT
→
(
FILTER
) so that
FILTER
is displayed.
Both displayed and output values are passed through a low-pass
filter with cut-off frequency (fc) of about 550 Hz. Values can be
reduced by about -3 dB (about 30%) when the Filter function is
enabled. Use this function to suppress the carrier component on
the secondary side of inverters, or to suppress noise. The figure
shows an example of its use.
Filter Characteristics
5.4 Filter Function
-15
-10
-5
0
5
10 100 1000
入力周波数 (Hz)
偏差
(d
B
)
Filter OFF
Filter ON
D
e
vi
at
io
n (
d
B)
Frequency (Hz)