Measuring Modes To Investigate Details - Fluke 434-II User Manual

Fluke 434-II/435-II/437-II
Users Manual
To get a general impression of the quality of a power system use MONITOR. The
MONITOR function displays a screen with Bar Graphs that show quality aspects of the
phase voltages. A Bar Graph changes from green to red if the related aspect does not
meet the active set of limits. An example of a set of limits is the set according to the
EN50160 norm. This set is present as a fixed set in the Analyzer's memory. Also user
definable sets can be stored in memory.
Numerical data is shown by Volts/Amps/Hertz. For this press the MENU key. Then
select Volts/Amps/Hertz and press F5 – OK to display a Meter screen with the present
values of voltages (rms and peak), currents (rms and peak), frequency and Crest Factors
per phase. Press F5 – TREND so display the course over time of these values.

Measuring modes to investigate details

Phase voltages. Should be close to the nominal value. Voltage waveforms must be a sine
wave that is smooth and free from distortion. Use Scope Waveform to check the
waveform shape. Use Dips & Swells to record sudden voltage changes. Use Transients
mode to capture voltage anomalies.
Phase currents. Use Volts/Amps/Hertz and Dips & Swells to check current/voltage
relations. Use Inrush Current to record sudden current increases like motor inrush.
Crest Factor. A CF of 1.8 or higher means high waveform distortion. Use Scope
Waveform to see waveform distortion. Use Harmonics mode to identify harmonics and
THD (Total Harmonic Distortion).
Harmonics. Use Harmonics mode to check for voltage and current harmonics and THD
per phase. Use Trend to record harmonics over time.
Flicker. Use Flicker to check short and long term voltage flicker and related data per
phase. Use Trend to record these values over time.
Dips & Swells. Use Dips & Swells to record sudden voltage changes as short as half a
cycle.
Frequency. Should be close to nominal value. Frequency is normally very stable. Select
Volts/Amps/Hertz to display frequency. The course of frequency over time is recorded in
the Trend screen.
Unbalance. Each phase voltage should not differ more than 1 % from the average of the
three. Current unbalance should not exceed 10 %. Use Scope Phasor or Unbalance mode
to investigate unbalances.
Energy Loss Calculator. Helps to determine where energy losses occur and to visualize
their impact on your energy bill.
Power Inverter Efficiency. Measures the efficiency and amount of energy being delivered
by inverters that convert single phase DC into single or three phase AC.
Mains Signaling. Can be used to analyze the level of remote control signals that often are
present on power distribution systems.
Logger. Allows you to store multiple readings with high resolution in a long memory.
The readings to logged are selectable.
Power Wave. The Analyzer functions as a high resolution 8 channel scope recorder.
Hint: in general the most efficient way to troubleshoot electrical systems, is to begin at
the load and work towards the building's service entrance. Measurements are taken along
the way to isolate faulty components or loads.
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