Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 25
Input Alert™ Feature, Using the Info Button, Hold and AutoHold Mode, Warning - fuse
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press 5 to scroll the screen horizontally and reveal the off-screen menu items. Conversely, with the menu selector on an item in the right-hand column, press 6 to reveal the off-screen menu items. Input Alert™ Feature XW Warning To avoid circuit damage and possibly blowing the Meter's current fuse, do not place the probes across (in parallel with) a powered circuit when a lead is plugged into a current terminal. This causes a short circuit because the resistance through the Meter's current terminals is very low. 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 displays "Leads connected incorrectly". 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. Using the Info Button While operating the Meter, more information about a selected function, a front-panel button, or a menu item may be necessary. Press I to open an information window that lists topics covering the functions and modifiers that are available at the time the button is pressed. Each topic provides a brief explanation on a Meter function or feature. True-rms Digital Multimeters Input Alert™ Feature The information revealed through I is not meant to replace the more detailed information found in this manual. Function and feature explanations are brief and only meant to refresh a person's memory. The number of information topics displayed at any one time may exceed the display area. Use the softkeys labeled Next and Prev to move from topic to topic. Use the softkey labeled More or 7 and 8 to scroll through the information a full screen at a time. Pressing the softkey labeled Close, or I will close the information window. Hold and AutoHold Mode To freeze the display for any function, press H. Only the minimeasurement display and hazardous voltage icon (z) continue to indicate the actual input. The battery level indicator is also active. The Meter's softkeys are relabeled for saving the frozen reading or activating the AutoHold mode. If H is pressed while MIN MAX record, peak record, or a recording session is in progress, the display freezes but the data acquisition continues in the background. Pressing H again updates the display to reflect data that was acquired during the hold. Pressing the softkey labeled AutoHOLD activates AutoHold if the Meter is not in the Peak, MIN MAX, or Record modes. AutoHold operation monitors the input signal and updates the display and, if enabled, sounds the beeper, whenever a new stable measurement is detected. A stable measurement is one that does not vary more than a selected adjustable percentage (AutoHold threshold) for at least one second. The Meter filters 15