Fluke 287/FVF Product Manual - Page 29
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 MyFlukeStore Shop for Fluke products online at: www. .com 1.888.610.7664