Fluke 279FC User Manual - Page 41

Auto Range and Manual Range, AC Zero Input Behavior of True-rms Meters, Manual

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Auto Range and Manual Range The Multimeter has auto range and manual range. When you turn on the Multimeter, it is set to auto range and Auto shows in the display. In auto range, the Multimeter selects the lowest range to display the highest available precision (resolution) for the input signal. To set the Multimeter to manual range: 1. Push  once to go to manual range. Manual shows in the display. 2. Push  again to go to the next range. Each push of  will cycle the Multimeter through the available ranges for the setting. The display updates to show the range in use. 3. Push and hold  >1 second to exit manual range and go to auto range. Or turn the rotary switch to a different function. Note The auto/manual range function is disabled for the V/HzAC, mV, continuity, and diode measurements and the MIN MAX AVG record and Hold modes. If you push  when in a function that does not have ranges, the Multimeter beeps twice to alert you to an invalid operation. True-rms Thermal Multimeter Measurement Features AC Zero Input Behavior of True-rms Meters Average responding meters can accurately measure only pure sinewaves. A true-rms meter can accurately measure distorted waveform signals. A minimum input voltage is necessary for true-rms converters to make a correct measurement. Because of this minimum input, true-rms meter measurements are only specified for 1 % to 100 % of range. Non-zero digits that are shown on a true-rms meter when the test leads are open or shorted are possible. This has no effect on the ac measurement accuracy of signals that are >1 % of range. Unspecified input levels on the lowest ranges are: • AC voltage

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True-rms Thermal Multimeter
Measurement Features
31
Auto Range and Manual Range
The Multimeter has auto range and manual range.
When you turn on the Multimeter, it is set to auto range and
Auto
shows in the display. In auto range, the Multimeter
selects the lowest range to display the highest available
precision (resolution) for the input signal.
To set the Multimeter to manual range:
1.
Push
once to go to manual range.
Manual
shows in the display.
2.
Push
again to go to the next range. Each push of
will cycle the Multimeter through the available
ranges for the setting. The display updates to show the
range in use.
3.
Push and hold
>1 second to exit manual range and
go to auto range. Or turn the rotary switch to a different
function.
Note
The auto/manual range function is disabled for the
V/HzAC, mV, continuity, and diode measurements
and the MIN MAX AVG record and Hold modes. If
you push
when in a function that does not
have ranges, the Multimeter beeps twice to alert
you to an invalid operation.
AC Zero Input Behavior of True-rms Meters
Average responding meters can accurately measure only pure
sinewaves. A true-rms meter can accurately measure
distorted waveform signals. A minimum input voltage is
necessary for true-rms converters to make a correct
measurement. Because of this minimum input, true-rms meter
measurements are only specified for 1
% to 100 % of range.
Non-zero digits that are shown on a true
-
rms meter when the
test leads are open or shorted are possible. This has no effect
on the ac measurement accuracy of signals that are >1
% of
range.
Unspecified input levels on the lowest ranges are:
•
AC voltage <1
% of 600 mV ac or 6
mV ac.
•
AC current <1 A.