Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 23
Controlling the Backlight, Selecting the Range, Understanding Function Menus - test leads
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recording mode, the time period is five minutes. For MIN MAX, Peak and AutoHold modes, the time period is the same time the Auto Off feature is set for. See the "Setting Backlight and Auto Off Timeouts" section later in this manual. Battery saver mode conserves battery power by shutting down circuits not necessary for the selected function, including the display. However, the LED surrounding the power button (O) will continue to flash to indicate the Meter is still collecting data. The Meter "wakes up" from battery-save mode under the following conditions: • A button is pressed • The rotary knob is moved • A lead is removed or inserted into a current input jack. • The Meter changes range • IR Communications begin These condictions only awaken the Meter and does not change the Meter's function or mode of operation. Controlling the Backlight If viewing the display becomes difficult in low-light conditions, press G to activate the LCD backlight. The backlight button cycles the backlight through three states: low, high, and off. The Meter displays a message if the battery level will not support the backlight operation. To conserve battery life, a user-adjustable timeout controls how long the backlight stays on. The default timeout is 5 minutes. To change the timeout, refer to "Setting Backlight and Auto Off Timeouts" later in this manual. True-rms Digital Multimeters Selecting the Range Selecting the Range The Meter's selected range is always displayed above the righthand end of the bar graph, as the range indicator. Pressing R switches the Meter between manual and autoranging. It also cycles through the Meter ranges when manual ranging is enabled. Note You cannot use R in conductance, diode test, LoZ, Low Ohms, and temperature functions. These functions all use a fixed range. In autorange, the Meter selects the lowest range to display the highest available precision (resolution) for the input signal. If Manual range is already enabled, press and hold R for one second to enter the autoranging mode. If autorange is enabled, press R to enter manual ranging. Each additional press of R sets the Meter to the next higher range, unless it is already in the highest range, at which point the range switches to the lowest range. Understanding Function Menus Each primary measurement function (rotary switch position) has a number of optional sub-functions or modes accessed by pressing the softkey labeled Menu (F1). A typical menu is shown in Figure 5. 13