5-8
5-9
5.4.3
5.4.3
5.4.3
5.4.3 SELECTING MIN AND MAX
SELECTING MIN AND MAX
SELECTING MIN AND MAX
SELECTING MIN AND MAX
Min, Max apply to phase currents and phase voltages. All values are DC-coupled and
therefore have the DC attribute only.
To select one of these quantities move the cursor to the display field, press SET
SET
SET
SET and
now move the cursor in the measurement function selection table to the required
function. To finish press SET
SET
SET
SET and return to the main display mode. The DC attribute is
shown in the side menu.
5.4.4
5.4.4
5.4.4
5.4.4 SELECTING POWER VALUES
SELECTING POWER VALUES
SELECTING POWER VALUES
SELECTING POWER VALUES
Power values are: active power (or just power) and apparent power. The values include
harmonics of the whole spectrum up to 50kHz and more.
DC components can be accounted for when selecting the DC attribute (AC+DC-
coupled).
Selecting the AC attribute DC components of the power values is disregarded.
The procedure for displaying power values is the same as described for rms values.
5.4.5
5.4.5
5.4.5
5.4.5 SELECTING AND RESETTING ENERGY VALUES AND
SELECTING AND RESETTING ENERGY VALUES AND
SELECTING AND RESETTING ENERGY VALUES AND
SELECTING AND RESETTING ENERGY VALUES AND
TIME
TIME
TIME
TIME
The two energy values, active energy and apparent energy, are the summation of power
and apparent power over time. Values for every phase and their total are determined
from start (after reset) to the end of measurement. The summation goes on even when
the display is in HOLD
HOLD
HOLD
HOLD. In addition to energy values you can also display elapsed time in
hours since Reset.
To start an energy measurement you probably want to reset the energy values and
time. For this purpose move the cursor to an energy value or time and press menu key
M5
M5
M5
M5 (RESET) to start energy computation.
5.4.6
5.4.6
5.4.6
5.4.6 SELECTING POWE
SELECTING POWE
SELECTING POWE
SELECTING POWER FACTOR (PF)
R FACTOR (PF)
R FACTOR (PF)
R FACTOR (PF)
The power factor is displayed by selecting PFact
PFact
PFact
PFact in the measurement function selection
table. The power factor is the ratio of power divided by apparent power. In many
situations using modern power electronics the power factor appears to be too small.
Why?
Power electronics most often generates a more or less sinusoidal current using a train
of voltage pulses. The broadband rms voltage is larger than an equivalent sinusoidal
voltage that would cause the
same current to flow. As a consequence apparent power
increases in case of the pulsed voltage and power factor decreases.
5.4.7
5.4.7
5.4.7
5.4.7 SELECTING FFT
SELECTING FFT
SELECTING FFT
SELECTING FFT VALUES, HARMONICS 1-20
VALUES, HARMONICS 1-20
VALUES, HARMONICS 1-20
VALUES, HARMONICS 1-20
FFT-values (Fast Fourrier Transform) are available for 3 phase currents and 3 phase
voltages. All values are computed simultaneously. You can display up to 30 FFT values
if you select the VIEWALL
VIEWALL
VIEWALL
VIEWALL display mode.
Let us display harmonics 1, 3, and 5 of current in display fields 0, 1, and 2. Move the
cursor to display field 0 and press SET
SET
SET
SET. From the measurement function selection table
select FFT of current and press SET once more to return to the main display. Because
the cursor points to display field 0 the attribute h01 of the FFT-value is shown in the side
menu. The bottom line menu
HOLD
HOLD
HOLD
HOLD
N-10
N-10
N-10
N-10
N-1
N-1
N-1
N-1
N+1
N+1
N+1
N+1
N+10
N+10
N+10
N+10
lets you
increment or decrement the harmonic number by 1 or by 10. Let us place harmonic h01
in display field 0. Similarly, we place harmonic 3 in display field 1, this time we
increment the harmonic number to h03 using the bottom line menu. Finally, we place
harmonic number 5 in display field 2 and increment the harmonic attribute to h05. The
fundamental of current and voltage are important quantities when working with inverters.
Range of fundamental frequency 4Hz-380Hz: available Harmonics 0-20
Range of fundamental frequency 380 Hz- 3kHz: available Harmonics 0-7
Range of fundamental frequency 3kHz- 10kHz: available Harmonics 0-1
