Fluke 87V Getting Started Guide - Page 17

Power-Up Options Holding a button down while turning the Meter on activates a power-up option. Table 4 includes the power-up options. Automatic Power-Off The Meter automatically turns off if you do not turn the rotary switch or press a button for 30 minutes. If MIN MAX Recording is enabled, the Meter will not power off. To disable automatic power-off, refer to Table 4. Input Alert™ Feature If a test lead is plugged into the mA/μA or A terminal, but the rotary switch is not set to the correct current position, the beeper warns you by making a chirping sound and the display flashes "LEAd". This warning is intended to stop you from attempting to measure voltage, continuity, resistance, capacitance, or diode values when the leads are plugged into a current terminal. W Caution Placing the probes across (in parallel with) a powered circuit when a lead is plugged into a current terminal can damage the circuit you are testing and blow the Meter's fuse. This can happen because the resistance through the Meter's current terminals is very low, so the Meter acts like a short circuit. Multimeters The Meter's Features Low Pass Filter (87) The 87 is equipped with an ac low pass filter. When measuring ac voltage or ac frequency, press A to activate the low pass filter mode (K). The Meter continues measuring in the chosen ac mode, but now the signal diverts through a filter that blocks unwanted voltages above 1 kHz, refer to Figure 2. The lower frequency voltages pass with reduced accuracy to the measurement below 1 kHz. The low pass filter can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency motor drives. 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. Note In Low Pass Mode, the Meter goes to manual mode. Select ranges by pressing the RANGE button. Autoranging is not available in Low Pass Mode. 1 kHz 100 Hz Figure 2. Low Pass Filter aom11f.eps 11