Amprobe DMIII-Multitest Power-Quality-Recorder - Manual (Page 51)

AMPROBE
DMIII MULTITEST
EN-49
7.4.3. "HARM" mode
By selecting the HARM mode one of the screens below will be displayed according to the
settings made. The screens show the harmonics 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 appendix 1
– MESSAGES DISPLAYED.
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 active:
 F3, F4:
to move the cursor of the selected harmonic leftwards and rightwards
respectively. At the same time the values related 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 7.4.2)
 SAVE:
to s
ave in the instrument memory a record of “Smp” type and the
instantaneous values of voltage and current present at the instrument
inputs. This function is disabled during a recording
 ENTER/HOLD: to enable/disable the HOLD function (updating interruption) of
displayed data. All previous functions remain however available. When
the HOLD function is activated, the word
HOLD is displayed. When
this function is enabled it’s not possible to record nor perform energy
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  