HT Italia VEGA 76, User Manual

Page: 25 / 60

VEGA 76
EN - 23
6.1.3. "HARM" mode
By selecting the HARM mode one of the below screens will be displayed according to the
settings made as per paragraph 5.22. The screens show the harmonics (see paragraph
16.2) of the phase or phase-to-phase voltage.
Example of screen in single-
phase system
Example of screen in “3-wire”
three-phase system
Example of screen in “4-wire”
three-phase system
The symbols used are described in Tab. 1. For eventual messages displayed see chapter
14. The displayed histograms represent the harmonic content of the voltage under test.
The value of the first harmonic h01 (fundamental at 50Hz) is not represented in scale
along with the other harmonics in order to maximize the display of the latter. In case both
voltage and current are connected to the instrument inputs, eventual negative values of
harmonics (therefore represented under the horizontal axis), indicate that such voltage
harmonics are “generated” by the load. Following keys are enabled:
•
F3 , F4 : to move the cursor of the selected harmonic leftwards and rightwards
respectively. At the same time the values relevant to the order no. of
the selected harmonic and to the corresponding absolute and relative
values (calculated on the basis of the fundamental) are updated.
•
F1 (only for three-phase mode): to display the values of the harmonics of
the other voltages available. The voltage displayed is indicated above
the F3 key.
•
F2 : to display the page of the harmonics h01
÷
h24 (symbol h24 ) or the
page of the harmonics h25
÷
h49 (symbol h49 ).
•
ESC : to return back to METER mode (see paragraph 6.1.2).
•
SAVE : to save in the instrument memory a record of “Smp” type (see
paragraph 5.4) and the instantaneous values of voltage and current
present on the instrument inputs. This function is disabled during a
recording.
•
ENTER/HOLD : to enable/disable the HOLD function (updating interruption) of the
displayed data. All the previous functions remain however available.
When the HOLD function is enabled, the word
HOLD is displayed.
When this function is enabled it’s not possible to record or take an
energy measurement. This function is disabled during a recording or
an energy measurement.
•
MENU : to enter the MENU mode and change the instrument settings (see
paragraph 5.2 and 5.3). It’s not possible to enter the configuration
MENU during a recording or an energy measurement.
•
START/STOP : to record selected parameters according to the instrument’s settings
(see chapter 7).
27.09.00 17:35:12
V1 = 230.2 V
h03 = 10.2 V
h03 = 4.3 %
ThdV = 11.0 %
h49 ← →
27.09.00 17:35:12
V12 = 400.2 V
h03 = 14.2 V
h03 = 3.5 %
ThdV = 11.0 %
ChgP h49 ← →
27.09.00 17:35:12
V1 = 230.2 V
h03 = 10.2 V
h03 = 4.3 %
ThdV = 11.0 %
ChgP h49 ← →