Electromagnetic Compatibility (Emc); Controls And Indicators - Urrea UD87 Manual De Usuario

2. ELECTROMAGNETIC
COMPATIBILITY (EMC)
The meters meet EN61326 : 1997 A 1: 1998.
3. CONTROLS AND
INDICATORS
1. 3-4/5 digit, 5000 (Primary display) / 5000
(Secondary display) count LCD display.
2. On screen menu selection push-buttons.
3. Push buttons for special functions &
features.
4. Selector to turn the power ON or OFF and
select a function.
5. Input terminal for 10A (20A for 30 sec.)
current measurement function.
6. Input terminal for milli-Amps and micro-
Amps current measurement function.
7. Common (Ground reference) input terminal
for all measurement functions.
8. Input terminal for all functions EXCEPT
current (A, mA, mA) measurement functions.
9. RS-232 Optical interface.
Glossary of Terms for Digital
Multimeters
Average sensing RMS calibrated
RMS (Root-Mean-Square) is the term used to
describe the effective or equivalent DC value
of an AC signal. Most digital multimeters use
average sensing RMS calibrated technique
to measure RMS values of AC signals. This
technique is used to obtain the average value
by rectifying and filtering the AC signal.
The average value is then scaled upward
(that is, calibrated) to read the RMS value
of a sine wave. In measuring pure sinusoidal
waveform, this technique is fast, accurate and
cost effective. However, in measuring non-
sinusoidal waveforms, significant errors can
be introduced because of different scaling
factors relating average to RMS values.
True RMS
True RMS is a term which identifies a DMM
that accurately responds to the effective
RMS value regardless of the waveform
shapes such as square, sawtooth, triangle,
pulse trains, spikes and transient glitches
as well as distorted waveforms with the
presence of harmonics.
Non-sinusoidal waveforms may cause:
- Overheated transformers, generator and
motors to burn out faster than normal.
- Circuit breakers to trip prematurely.
- Fuses to blow.
- Neutrals to be overheated due to the triplen
harmonics present on the neutral.
- Bus bars and electrical panels to vibrate.
E N G L I S H
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