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.
To Next Page
Loading...
