Fluke 189 - Manual (Page 16)

Model 187 & 189
Users Manual
2-2
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Figure 2-1. AC Volts Display
Battery Considerations
The meter uses four AA alkaline batteries. The following
paragraphs describe several techniques used to conserve
battery power.
Automatic Power Off
The display blanks and the meter goes into a “sleep”
mode if you have not changed the rotary switch position or
pressed a button for a set period. While in Sleep mode,
pressing any button turns the meter on. The meter then
returns to the display for the function selected with the
rotary switch; all previously activated button features
(HOLD, Hz, etc.) are discarded.
The automatic power off is preset to 15 minutes. From the
Setup menu (see Chapter 5), you can specify a maximum
period of 23 hours, 59 minutes. If you set the period to 0,
the meter remains on until you turn the rotary switch to
OFF or the batteries become too weak.
Automatic power off does not occur if the meter is in MIN
MAX, FAST MN MX, AutoHOLD, or LOGGING
(Model 189) mode.