28 II Ex
Users Manual
18
Low-Pass Filter
The Product has an ac low-pass filter. When you
measure ac voltage or ac frequency, push to set
the low-pass filter mode (K). The Product measures in
the chosen mode, but the signal diverts through a filter
that stops unwanted voltages more than 1 kHz, refer to
Figure 3. The lower frequency voltages go through with
decreased accuracy to the measurement less than 1 kHz.
The low-pass filter can get you better measurement
performance on composite sine waves that are typically
found on inverters and variable-frequency motor drives.
XW Warning
To prevent electric shock or personal injury,
do not use the low-pass filter when you
measure for hazardous voltages. Voltages
larger than what is shown can be present.
First, make a voltage measurement without
the filter to see if a hazardous voltage is
present. Then, select the filter.
Note
When the low-pass filter is selected, the Product
goes to manual range mode. Push C to set
the range. The Product does not autorange with
the low-pass filter set.
1 kHz
100 Hz
aom11f.eps
Figure 3. Low-Pass Filter
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