Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 30

Low Pass Filter (Model 289 only

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287/289 Users Manual Low Pass Filter (Model 289 only) The Meter is equipped with an ac low pass filter. When measuring ac voltage, or Vac frequency, press the softkey labeled Menu to open the function menu, and move the menu selector to the l item. Next, press the softkey labeled l to toggle the low pass filter mode on (l displayed) and off. XWWarning To avoid possible electric shock or personal injury, do not use the Low Pass Filter option to verify the presence of hazardous voltages. Voltages greater than what is indicated may be present. First, make a voltage measurement without the filter to detect the possible presence of hazardous voltage. Then select the filter function. The Meter continues measuring in the chosen ac mode, but now the signal passes through a filter that blocks unwanted voltages above 1 kHz, as shown in Figure 8. The low pass filter can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency motor drives. Note In Low Pass Mode, the Meter goes to manual mode. Select ranges by pressing R. Autoranging is not available when the Low Pass Filter is enabled. 20 1 kHz 100 Hz Figure 8. Low Pass Filter aom11f.eps

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287/289
Users Manual
20
Low Pass Filter (Model 289 only)
The Meter is equipped with an ac low pass filter. When
measuring ac voltage, or Vac frequency, press the softkey
labeled
Menu
to open the function menu, and move the menu
selector to the
l
item. Next, press the softkey labeled
l
to toggle the low pass filter mode on (
l
displayed)
and off.
XW
Warning
To avoid possible electric shock or personal
injury, do not use the Low Pass Filter option to
verify the presence of hazardous voltages.
Voltages greater than what is indicated may be
present. First, make a voltage measurement
without the filter to detect the possible presence of
hazardous voltage. Then select the filter function.
The Meter continues measuring in the chosen ac mode, but now
the signal passes through a filter that blocks unwanted voltages
above 1 kHz, as shown in Figure 8. The low pass filter can
improve measurement performance on composite sine
waves that are typically generated by inverters and variable
frequency motor drives.
Note
In Low Pass Mode, the Meter goes to manual mode.
Select ranges by pressing
R
. Autoranging is not
available when the Low Pass Filter is enabled.
1 kHz
100 Hz
aom11f.eps
Figure 8. Low Pass Filter