Fluke 289 - Manual (Page 32)

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Users Manual
22
Making Measurements
The following sections describe how to take measurements with
the Meter.
Measuring AC Voltage
The Meter displays ac voltage measurements as rms (root mean
square) readings. The rms value is the equivalent dc voltage that
would produce the same amount of heat in a resistance as the
measured voltage. True-rms readings are accurate for sine
waves and other wave forms (with no dc offset) such as square
waves, triangle waves, and staircase waves. For ac with dc
offset, refer to the “Measuring AC and DC Signals” section later
in this manual.
Rotate the Meter’s rotary switch to V or T and set up the Meter
to measure ac volts as shown in Figure 10.
The Meter’s ac volts function offers a number of modes to
provide more details about an ac signal. Pressing the softkey
labeled Menu opens a menu of items that can be used to modify
the basic ac voltage measurement. Refer to the appropriate
section in this manual to learn more about each menu item.
To clear all modes and return to the basic volts ac measurement,
press the softkey labeled Menu. Move the menu selector to the
item labeled VAC. Press the softkey labeled VAC to clear all
functions and modes.
Menu
123.45 VAC
Save Setup
Auto Range 500 VAC 0
08:10pm 03 / 13/ 06
100 200 300 400
Switch
Box
est07.eps
Figure 10. AC Voltage Measurements